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Engineering Entrance Exam Question Answers - Physics
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Question 1 |
The atomic mass of ionic lithium atoms are 0.06 amu. If they are motion with energy 400 eV in magnetic field of 0.08 T, then radius of circular path will be
8.83 cm | |
9.23 cm | |
10.5 cm | |
11.25 cm |
Question 2 |
Two charges 4q and q are placed at distance /. In the middle adjoining line a charge Q is kept. If resultant force on q will be zero, then Q will be
+q | |
-q | |
+2q | |
-2g |
Question 3 |
Two coherent monochromatic light beam of intensities I and 41 are superposed. The maximum and minimum possible intensities in the resulting beam are
31 and 21 | |
257 and 97 | |
97 and 7 | |
57 and 37 |
Question 4 |
Two steady sound sources having same frequency are placed at a distance of 1 m. An observer is moving at a distance of 10 m along the line joining there source. If the observed distance between first two successive maxima is 0.11 m, then frequency of sources is (velocity of sound v = 330 m/s.)
1000 Hz | |
3000 Hz | |
3500 Hz | |
4000 Hz |
Question 5 |
car moving with a speed of 28 m/s and blowing the horn of 500 Hz frequency waves another car moving at 15 m/s. What will be the observed frequency is the dimer of second car?
(speed of sound = 332 m/s)
480Hz | |
500 Hz | |
520Hz | |
580Hz |
Question 6 |
The average emf induced in a coil in which current changes from 2 A to 4 A in 0.05 s is 8 V. What is the self Inductance of the coil?
0.5 H | |
0.35 H | |
0.2 H | |
2 mH |
Question 7 |
In a potential meter, a voltage source and battery of 3 V are balance at length 60cm length 45 cm respectively. The emf unknown voltage will be
3V | |
4V | |
4.5V | |
6V |
Question 8 |
The square coil of turn 60 has length 20 cm and breath 10 cm is rotating rate of 1800 rev/min in uniform magnetic field of intensity 0.5 T. the maximum emf of coil will be
98V | |
110V | |
113V | |
118V |
Question 9 |
The number of turn in the primary coil of a transformer is 240. For an input of alternating voltage 20 V, output voltage is 2.5 V. 7 number of turns in the secondary coil is
250 | |
100 | |
10 | |
30 |
Question 10 |
A given charge is situated at a certain distance from an electric dipole in the end on position experience a force F. If the distance of the charge is doubled, the force acting on the charge will be
zero | |
F/2 | |
F/4 | |
F/8 |
Question 11 |
Some point in progressive waves are
not remain at rest | |
always move | |
in each cycle two times at rest at the same
time | |
in each cycle one time at rest at the same time |
Question 12 |
One end closed pipe of length L resonented at any frequency. The length of open both ends pipe, for resonant at same frequency will be
L/2 | |
L | |
3L/2 | |
2L |
Question 13 |
The frequency of Piano of length 1.1 m and of mass 160 g is 33 Hz, the tension will be
556 N | |
3000 N | |
843N | |
995N |
Question 14 |
A tuning forks gives 5 beats/s with 20 cm length of sonometer. If length of wire changes from 20 to 21, and not change in frequency, then frequency of tuning forks will be
205 Hz | |
210 Hz | |
220 Hz | |
195 Hz |
Question 15 |
When semiconductor makes from Germanium doped by phosphorus, then in semiconductor
quantity of negative electric charge will be maximum | |
electrons will be maximum | |
quantity of positive electric charge will be maximum | |
holes will be maximum |
Question 16 |
In insulator, energy interval of low order is
zero | |
0.7 eV | |
1.1 eV | |
5 eV |
Question 17 |
A hydrogen atom is in first excited state, then ion energy will be
13.l eV | |
3.4 eV | |
1.51 eV | |
1.9 eV |
Question 18 |
Crod makes of soft iron in electromagnet, because its
diathesis and retantivity are maximum | |
diathesis is maximum and retantivity is minimum | |
diathesis and retantivity are minimum | |
retantivity is maximum and diathesis minimum |
Question 19 |
A converging lens is used to form an image on a screen. When half of the lens is covered by opaque screen.
Half the image will disappear | |
Upper half the image will disappear | |
Complete image will be formed of decreased intensity | |
Complete image will disappear |
Question 20 |
Half year of a radioactive element is 5 days. The time during which quantity remains 7/8 of initial mass will be
2,5 days | |
5 days | |
10 days | |
15 days |
Question 21 |
The chemical equivalent of silver is 108. If the current in silver voltameter is 2 A; then the during time in collecting of 27 g silver will be
8.75 h | |
6.70 h | |
3.35 h | |
12.50 h |
Question 22 |
For iron magnet materials
permeability is high and tendency is positive and low | |
permeability is very high and tendency is negative and low | |
permeability is very low and tendency is positive and high | |
permeability is very low and tendency is negative and low |
Question 23 |
To obtain a P-type germanium semiconductor, it must be doped with
boran | |
antimany | |
arsenic | |
phosphorus |
Question 24 |
The ratio of ioning power of a and B particle emitted from a radioactive element will be
1:100 | |
100:1 | |
1000: 1 | |
1: 1000 |
Question 25 |
In question 98, how much inductance is added the circuit so that reactance becomes minimum?
O.31H | |
O.41H | |
1.25 H | |
1.75 H |
Question 26 |
When hydrogen atom makes a transition from ground state to excited state, then
its kinetic and potential energies decrease. | |
potential energy increases and kinetic energy decreases | |
potential energy decreases and kinetic energy increases | |
its kinetic and potential energies increase |
Question 27 |
A heater coil is labelled 100 W, 220 V. The coil is cut into two equal halves and the two pieces are joined in parallel to the same source. The energy now liberated per second is
50J | |
40J | |
4000J | |
400J |
Question 28 |
A straight conductor of length 0.4 m is moved with a speed of 7 m/s perpendicular to the magnetic field of intensity of 0.9 Wb/m2. The induced emf across the conductor will be
3.52 V | |
25.2 V | |
2.52 V | |
0.252 V |
Question 29 |
Dimension of RC is
square of time | |
equal to time | |
Inverse of time | |
inverse of square of time |
Question 30 |
Efficiency of a Carnot engine is 40% when temperature of outlet is 500 K. In order to increase efficiency up to 50% keeping temperature of intake the same. What is temperature of outlet?
700K | |
600K | |
400K | |
500K |
Question 31 |
Which of the following is used to produce radio waves of constant amplitude
oscillator | |
FET | |
Rectifier | |
Amplifier |
Question 32 |
Water drops fall at regular intervals from a tap which is 5m above the ground. The third drop is learning the tap at the instant the first drop touches the ground. How for above the ground is the second drop at that instant?
2.50 m | |
3.75 m | |
4.00 m | |
1.25 m |
Question 33 |
A particle is moving on circular path. The
centripetal force is inversely proportional to
distance r. The velocity of particle will
be proportional to r | |
not depend upon r | |
be inversely proportional to r | |
be proportional to r2 |
Question 34 |
An electron makes a transition from orbit n = 4 to be the orbit n = 2 of a hydrogen atom. The wave number of the emitted radiations (R = R vdberg’s constant) will be
7/16 R | |
3R/16 | |
16/3 R | |
9R/16 |
Question 35 |
The bond present in conductors are
covalent | |
metallic | |
van der Waals | |
ionic |
Question 36 |
The work done in turning a magnet of magnetic moment M by angle of 900 from the meridian is n times the corresponding work done to turn it through an angle of 60° where n is given by
4 | |
2 | |
1/2 | |
1 |
Question 37 |
The surface tension of soap bubbles is 0.03 N/m
(both surfaces). The excess pressure inside a soap
bubbles of diameter 30 mm is
2Pa | |
8Pa | |
16 Pa | |
10 Pa |
Question 38 |
The length of a sonometer wire AB is 110 cm. At what distance the two bridge are placed so that the wire is divided into such three parts. Basic frequencies of which are in the ratio of 1 : 2 : 3.
60 cm and 30 cm | |
60 cm and 90 cm | |
20cm and 40cm | |
40cm and 60cm |
Question 39 |
Which of the following is not a state function?
Work done at constant pressure | |
Enthalpy | |
Work done by conservative force | |
Work done by non-conservative force |
Question 40 |
An aluminium rod and a copper rod are taken such that their lengths are same and their resistances are also same. The specific resistance of copper is half that of aluminium, but its density is three times that of aluminium. The ratio of the mass of aluminium rod and that of copper rod will be
1/6 | |
2/3 | |
1/3 | |
6 |
Question 41 |
In a potentiometer, the null point is received at
7th wire. If now we have to change the null point
at 9th wire, what should we do?
Attach resistance in series with battery | |
Increase resistance in main circuit | |
Decrease resistance in main circuit | |
Decrease applied emf |
Question 42 |
Reverberation time does not depend upon
temperature | |
volume of room | |
size of window | |
carpet and curtain |
Question 43 |
Which of the following is true regarding beats?
Frequency different, amplitude same | |
Frequency same, amplitude same | |
Frequency same, amplitude different | |
None of the above |
Question 44 |
When both the listener and source are moving towards each other, then which of the following is true regarding frequency and wavelength of wave observed by the observer?
More frequency, less wavelength | |
More frequency, more wavelength | |
less frequency, less wavelength | |
More frequency, constant wavelength |
Question 45 |
In which of the following, force is constant?
Uniform circular motion | |
Elliptical motion | |
Uniform linear motion | |
Projectile motion |
Question 46 |
The coefficient of friction between the tyres and the road is 0.25. The maximum speed with which car can be driven round a curve of radius 40 m without skidding is (assume g=l0m/s2)
40 m/s | |
20 m/s | |
15 m/s | |
10 m/s |
Question 47 |
The minimum force required to move a body of mass m vertically upward is
mg | |
mg/2 | |
more than 2 mg | |
more than mg |
Question 48 |
If distance between earth and sun become four times than time period becomes
4 times | |
8 times | |
1/4 times | |
1/8 times |
Question 49 |
An air bubble is contained inside water. It behaves
as
concave lens | |
convex lens | |
neither convex nor concave | |
Cannot say |
Question 50 |
The power dissipated across resistance R which is connected across a battery of potential V is P. If resistance is doubled, then the power becomes
1/2 | |
2 | |
1/4 | |
2 |
Question 51 |
BE/nucleon relation with mass number
first decreases then increases | |
first increases then decreases | |
increases | |
decreases |
Question 52 |
Which of the following four fundamental forces has shortest range?
Nuclear | |
Gravitational | |
Electromagnetic | |
Weak force |
Question 53 |
If acceleration of a particle at any time is given by a=2t+5
Calculate, the velocity after 5s, if it starts from rest.
50 m/s | |
25 m/s | |
100 m/s | |
75 m/s |
Question 54 |
To look inside an atom of diameter 100 pm we have to penetrate it upto a breadth of 10 pm. If we use an electron microscope, the minimum required energy will be
1.5 keV | |
15 keV | |
l50keV | |
1.05 keV |
Question 55 |
Light year is used to measure
distance between stars | |
distance between atoms | |
revolution time of earth around sun | |
None of the above |
Question 56 |
Electromagnetic waves are produced by
accelerated charged particle | |
decelerated charged particle | |
charge in uniform motion | |
None of the above |
Question 57 |
A beam of proton with velocity 4 x l05 m/s enters
a uniform magnetic field of 0.3 T at an angle of
600 to the magnetic field. Find the radius of the
helical path taken by the proton beam.
0.2 cm | |
1.2 cm | |
2.2 cm | |
0.122 cm |
Question 58 |
When light passes from one medium to other then which will not change?
Frequency | |
Wavelength | |
Amplitude | |
Velocity |
Question 59 |
Total internal reflection takes place
When a ray moves from denser to rarer and incident angle is greater than critical angle. | |
When a ray moves from rarer to denser and incident angle is less than critical angle. | |
When a ray moves from rarer to denser and incident angle is equal to critical angle. | |
None of the above |
Question 60 |
The equipotential surface related to an electric field, increases in magnitude along x-axis Is
plane parallel to y-z plane | |
plane parallel to x-y plane | |
plane parallel to x-z plane | |
equi axis cylinder of increasing radius about x-axis |
Question 61 |
During projectile motion, the horizontal velocity
first increases then decreases | |
first decreases then increases | |
always increases | |
always constant |
Question 62 |
Find the ratio of acceleration due to gravity g at depth d and at height A, where, d = 2h.
1:1 | |
1:2 | |
2:1 | |
1:4 |
Question 63 |
According to Huygen,s principle, the locus of all the particles of the medium, which at any instant are vibrating in the same phase, is called
half period zone | |
oscillator | |
wavefront | |
ray of light |
Question 64 |
An oil on the water surface spreads like a thin layer because
oil drop tries to become spherical due to the surface tension | |
surface tension of water is greater than the surface tension of oil | |
surface tension of water is equal to the surface of oil | |
weight of oil is less than weight of water |
Question 65 |
A body placed on the earth at static position. If it is pushed then the final state of centre of gravity will be
near the earth | |
at some height from the earth | |
remain same | |
remain at the same plane |
Question 66 |
If the earth stops moving around its polar axis then what will be effect on body placed at south axis?
Remain same | |
Increase | |
Decrease but not zero | |
Decrease zero |
Question 67 |
The temperature of sun is
1000 K | |
7000 K | |
10K | |
l0x 106K |
Question 68 |
Hydrogen gas is filled in the bubble. For the sound
wave, the bubble will be
like a converging lens | |
like a convex mirror | |
like a concave lens | |
None of the above |
Question 69 |
The ratio of radius of two bubbles is 2 : 1. What is the ratio excess pressure inside them
1:2 | |
1:4 | |
2:1 | |
4:1 |
Question 70 |
Brownian motion is evidence of
kinetic energy of substance | |
principle of electromagnetic | |
Newton’s law | |
photoelectric phenomenon |
Question 71 |
Beats are result of
interference | |
refraction | |
reflection | |
diffraction |
Question 72 |
An ice block contains a glass ball when the see melts within the water containing vessel, the level of water
will increase | |
will decrease | |
will remain same | |
first increase and after that decrease |
Question 73 |
Two bodies of masses 2 kg and 4 kg having velocities 2 m/s and 10 m/s respectively are coming close to each other under a gravitational force, then the velocity of centre of mass will be
5m/s | |
6m/s | |
8 m/s | |
zero |
Question 74 |
The ratio of intensities of two beams of light in interference is 9:1. The ratio of maximum and minimum intensities
10:8 | |
9:1 | |
4:1 | |
2:1 |
Question 75 |
Four wires having same length, diameter and material are connected in the form of a square. If the resistance of each wire is R, then resistance of combination across any two opposite ends is
R | |
R/2 | |
R/4 | |
None of these |
Question 76 |
The electric motor operating on a 200 volt DC supply draw a current of 10 A. If the power is 40%, then resistance of motor
20 | |
8n | |
12n | |
16n |
Question 77 |
What is increased in step down transformer?
current | |
voltage | |
power | |
frequency |
Question 78 |
According to modern physics the nature of light is
only wave | |
only particle | |
Both wave and particle | |
None of the above |
Question 79 |
Which has more luminous efficiency?
a 40 W bulb | |
a 40 W tube light | |
Both of same | |
Cannot say |
Question 80 |
The half-life of radioactive element is 600 yr. The fraction of sample that would remain after 3000 yr is
1/2 | |
1/16 | |
1/8 | |
1/32 |
Question 81 |
The light of wavelength 5000 A falls on a photosensitive plate of work function 1.9 eV. The kinetic energy of the emitted photoelectron is
0.58 eV | |
2.48 eV | |
1.24 eV | |
1.18 eV |
Question 82 |
The number of electrons and holes in semiconductor at normal temperature will be
equal | |
zero | |
unequal | |
infinite |
Question 83 |
A cylindrical conductors is placed near an another
positive conductor, the total charge induced by
the conductor is
only positive | |
only negative | |
zero | |
None of these |
Question 84 |
If units of force, length and time are 1 kilo-newton, 1 km and 100 second respectively, then unit of mass will be
1000 kg | |
1kg | |
10000 kg | |
100 kg |
Question 85 |
Which of the following equation represents a
progressive wave?
y=Acos ax sin bt | |
y=Asin bt | |
y=Acos(ax +bt) | |
y =Atan(ax+bt) |
Question 86 |
The frequency and velocity of sound wave are 600 Hz and 360 m/,s respectively. Phase difference between two particles of medium are 60°, the minimum distance between these two particles will be
10 cm | |
15 cm | |
20 cm | |
50 cm |
Question 87 |
The heat required to increase the temperature of
4 moles of a monoatomic ideal gas from 273 K to
473 K at constant volume is
200H | |
400R | |
800J | |
1200R |
Question 88 |
A solid sphere rolls without slipping on the roof.
The ratio of its rotational kinetic energy and its
total kinetic energy is
2/5 | |
4/5 | |
2/7 | |
3/7 |
Question 89 |
A black body at a temperature of 2600 K has the wavelength corresponding to maximum emission 1200A. Assuming the moon to be perfectly black body the temperature of the moon, if the wavelength corresponding to maximum emission is 5000 A is
7800 K | |
6240 K | |
5240 K | |
3640 K |
Question 90 |
When the light enters from air to glass, for which colour the angle of deviation is maximum?
Red | |
Yellow | |
Blue | |
Violet |
Question 91 |
Which of the following event, support the
quantum nature of light?
Diffraction | |
Polarization | |
Interference | |
Photoelectric effect |
Question 92 |
The electric potential at centre of metallic
conducting sphere is
zero | |
half from potential at surface of sphere | |
equal from potential at surface of sphere | |
twice from potential at surface of sphere |
Question 93 |
Magnet moment of bar magnet is M. The work done to turn the magnet by 90° of magnet in direction of magnetic field B will be
zero | |
1-MB | |
2MB | |
MB |
Question 94 |
The maximum voltage in DC circuit is 282 Volt.
The effective voltage in AC circuit will be
200V | |
300V | |
400 V | |
564 V |
Question 95 |
A charged particle enters in a magnetic field whose direction is parallel to velocity of the particle, then the speed of this particle
in straight line | |
in coiled path | |
in circular path | |
in ellipse path |
Question 96 |
Which of the following transition gives the photon of minimum frequency?
n=2 to n=1 | |
n=3 to n=1 | |
n=3 to n=2 | |
n=4 to n=3 |
Question 97 |
Ionization energy of He+ ion at minimum position is
13.6 eV | |
27.2 eV | |
54.4 eV | |
68.0 eV |
Question 98 |
The half-life period of a radioactive substance is 3 days. Three fourth of substance decays in
3days | |
6 days | |
9 days | |
12 days |
Question 99 |
A galvanometer can be converted into a voltmeter
by connecting
low resistance in parallel | |
low resistance in series | |
high resistance in parallel | |
high resistance in series |
Question 100 |
A heater coil cut into two equal parts and one part is connected with heater. Now heat generated in heater will be
twice | |
half | |
one- fourth | |
four times |
Question 101 |
1 mole of gas occupies a volume of 200 ml at 100 mm pressure. What is the volume occupied by two moles of gas at 400 mm pressure and at same temperature?
50 mL | |
200 mL | |
100 mL | |
400 mL |
Question 102 |
One circular ring and one circular disc, both are having the same mass and radius. Then both of their moments of inertia about the axes passing through their centres and perpendicular to their planes, will be in the ratio
1:1 | |
2:1 | |
1:2 | |
4:1 |
Question 103 |
Two spheres P and Q, of same colour having radii
8 cm and 2 cm are maintained at temperature
127°C and 527°C respectively. The ratio of energy
radiated by P and Q is
0.054 | |
0.0034 | |
1 | |
2 |
Question 104 |
When light rays from the sun fall on a convex lens
along a direction parallel to its axis.
Focal length for all colors is the same | |
Focal length for violet color is the shortest | |
Focal length for yellow color is the longest | |
Focal length for red color is the shortest |
Question 105 |
Diffraction and interference of light suggest
nature of light is electromagnetic | |
wave nature | |
nature is quantum | |
nature of light is transverse |
Question 106 |
If two waves of same frequency and same amplitude respectively, are superimposed on each other produces a resultant disturbance of the same amplitude, then the waves differ in phase by
r | |
2r/3 | |
r/2 | |
zero |
Question 107 |
The intensity of magnetic field is H and moment of magnet is M. The maximum potential energy is
MH | |
2 MH | |
3MH | |
4MH |
Question 108 |
The minimum energy required to excite a hydrogen atom from its ground state is
13.6 eV | |
-13.6 eV | |
3.4 eV | |
10.2 eV |
Question 109 |
Potential gradient is defined as
fall of potential per unit length of the wire | |
fall of potential for unit area of the wire | |
fall of potential between two ends of the wire | |
potential at any one end of the wire |
Question 110 |
If two bulb have 40 W and 60 W rating at 220 V then the ratio of their resistances will be
9:4 | |
4:3 | |
3:8 | |
3:2 |
Question 111 |
A quarter horse power motor runs at a speed of
600 rpm. Assuming 40% efficiency, the work done
by the motor in one rotation will be
7.46 J | |
7400 J | |
7.46 erg | |
74.6 J |
Question 112 |
The volume of a gas at 210 C temperature and 768
mm pressure is 1 litre. If the density of the gas is
1.2 g dm-3 at NTP, then its mass will be
4g | |
4.22g | |
1.13 g | |
l0g |
Question 113 |
Which of the following statement are true in a case when two water drops coalesce and make a bigger drop?
Energy is neither released and nor absorbed | |
Energy is absorbed | |
The surface area of the bigger drop is greater than the sum of the surface area of both the drops | |
The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops |
Question 114 |
The x and y coordinates of a particle at any time t are given x = 7t + 4t2 and y = 5t, where x and y are
in metre and t in second. The acceleration of
particle at t= 5s is
zero | |
8m/s2 | |
20 m/s2 | |
40 m/s2 |
Question 115 |
A small object placed on a rotating horizontal turn-table just slips when it is placed at a distance of 4 cm from the axis of rotation. If the angular velocity of the turn-table is doubled the object slips when its distance from the axis of rotation is
lcm | |
2cm | |
4cm | |
8cm |
Question 116 |
A bullet of 5 g is fired with a velocity of 800 m/s. The velocity of bullet becomes 200 m/s when it pierces a wooden block 2 m thick. What is the average resistance offered by the wooden block?
8.5 kN | |
7.5 kN | |
6.5 kN | |
30 kN |
Question 117 |
The two waves, whose intensities are 9 : 16 are made to interfere. The ratio of maximum and minimum intensities in the interference pattern is
16:9 | |
4:3 | |
25:7 | |
49:1 |
Question 118 |
The rate of outflow of liquid through an orifice
does not depend upon
radius of the orifice | |
height of the liquid column | |
acceleration due to gravity | |
density of the liquid |
Question 119 |
Two lamps of powers P1 and P2 are placed on either side of a paper having an oil spot. The lamps are at distances of 1 m and 2 m respectively on either side of the paper and the oil spot is invisible. What is the value of P1/P2?
0.25 | |
0.40 | |
0.50 | |
0.60 |
Question 120 |
Mid way between the two equal and similar charges, we place the third equal and similar charge. Which of the following statements is correct?
The third charge experiences a net force inclined to the line joining the charges | |
The third charge is in stable equilibrium | |
The third charge is in unstable equilibrium | |
The third charge experience a net force perpendicular to the line joining the charges |
Question 121 |
A magnetic field of 20 T is normal to a coil of 100 turns and area 10-2 m2. If the coil is removed from the magnetic field is 2 ms, what is the induced emf set up in the coil?
2 kV | |
5 kV | |
7 kV | |
10 Kv |
Question 122 |
If half-life of a radioactive atom is 2.3 days then its decay constant would be
0.1 | |
0.2 | |
0.3 | |
2.3 |
Question 123 |
The half-life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be
93.75% | |
75% | |
25% | |
6.25% |
Question 124 |
A capacitor of capacitance 6 u F is charged upto
100 V. The energy stored in the capacitor is
0.6 J | |
0.06 J | |
0.03 .1 | |
0.3 J |
Question 125 |
A 750 Hz, 20 V source is connected to a resistance of 1000Q, an inductance of 0.1803 H and a capacitance of 10 u F all in series. What is the time in which resistance (thermal capacity 2 J/°C) will get heated by 10°C?
380s | |
384s | |
470s | |
479s |
Question 126 |
A capacitor discharges through an inductor of
0.02 H. If the frequency of discharge is 100 Hz
then what is the capacitance of the capacitor?
14.67 u F | |
12.67 u F | |
9.67 u F | |
4.67 u F |
Question 127 |
A bomb of 12 kg explods into two pieces of
masses 4 kg and 8 kg. The velocity of 8 kg mass is
6 m/s. The kinetic energy of the other mass is
48 J | |
32 J | |
24 J | |
288 J |
Question 128 |
A body cools in 7 mm from 60°C to 40°C. What time does it take to cool from 400C to 280C if the surrounding temperature is 10°C?
3.5 min | |
14 min | |
7 min | |
10 min |
Question 129 |
What is the color of the interference fringe nearest to the white central maximum in case the source of light is white?
Yellow | |
Red | |
Blue | |
Violet |
Question 130 |
What will be the kinetic energy of an electron having de-Broglie wavelength 2A?
37.5 eV | |
75 eV | |
l50 eV | |
30 eV |
Question 131 |
Focal length of a convex lens will be maximum for
blue light | |
yellow light | |
green light | |
red light |
Question 132 |
Pitch of a node depends upon
frequency | |
wavelength | |
amplitude | |
None of these |
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Engineering Entrance Exam Question Answers - Chemistry
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Question 1 |
Which of the following statements is true for enzymes?
I. Enzymes do not have nucleophilic groups.
II. Enzymes are specific in joining with chiral molecules and catalyse their reaction.
III. Enzyme catalysis the chemical reactions by decreasing the activation energy.
IV. Pepsin is a proteolytic enzyme.
I | |
I and IV | |
I and III | |
II. Ill and IV |
Question 2 |
Identify the correct statement.
Plaster of Paris is obtained by the partial oxidation of gypsum. | |
The percentage of plaster of calcium in gypsum is less than plaster of Paris. | |
Gypsum is obtained by the plaster of Paris on heating. | |
Plaster of Paris is obtained by the addition of water in gypsum. |
Question 3 |
The electronic configuration of a element is
1s2,2s2,2p6,3s2,3p3.What is the atomic
number of element which is below exactly this element in the Periodic Table?
49 | |
31 | |
34 | |
33 |
Question 4 |
Ideal gas which obeys the molecular kinetic theory of gases can be liquified. If
it cannot be liquified at any pressure and temperature. | |
its pressure is greater than pc at less temperature from T. | |
its temperature is greater than critical temperature Tc . | |
its pressure is greater than critical pressure. |
Question 5 |
The oxidation of glucose in living cell is a
important reaction. What are number of ATP
molecules which are produced by
molecules of glucose in cells?
28 | |
38 | |
12 | |
18 |
Question 6 |
A chemical reaction is catalysed by catalyst X.
Hence, X
increases the activation energy of reaction. | |
does not effect the equilibrium constant of reaction. | |
decreases the velocity constant of reaction. | |
decreases the enthalpy of reaction. |
Question 7 |
The formation of bakelite takes place between the reaction of
phenol and formaldehyde | |
ethylene glycol and dimethyl terephthalate | |
urea and formaldehyde | |
tetramethylene glycol and hexa methylene diisocynate |
Question 8 |
Aluminium(111) chloride forms a dimer because
the ionisation energy of aluminium is high. | |
it cannot form trimer. | |
high coordination number can obtain by aluminium | |
aluminium belongs to third group. |
Question 9 |
Mercury is the only metal which is liquid at
0°C because
high vapour pressure | |
high ionisation energy and weak metallic bond | |
low ionisation potential | |
high atomic weight |
Question 10 |
The pH does not change on the addition of some amount of acid or base in the blood, because blood
becomes coagulate easily | |
has serum protein which acts as buffer | |
is liquid of body | |
has iron in the form a part of molecule |
Question 11 |
When benzene diazonium chloride solution is boilded it yields
benzene | |
phenol | |
aniline | |
chlorobenzene |
Question 12 |
The half-life of C14 radioactive is 5760 yr. After how much time will 200 mg C14 sample be reduced to 25 mg?
23040 yr | |
17280 yr | |
11520 yr | |
5760 yr |
Question 13 |
When benzene diazonium chloride solution is boilded it yields
benzene | |
phenol | |
aniline | |
chlorobenzene |
Question 14 |
Acetone reacts with chloroform in the presence of NaOH to give
chloral | |
chloretone | |
acetyl chloride | |
ethyl chloride |
Question 15 |
According to Raoult’s law the relative lowering in vapour pressure of a solution is equal to
moles of solute | |
mole fraction of solvent | |
moles of solvent | |
mole fraction of solute |
Question 16 |
In ideal condition, the number of moles of oxygen in 1 L air which has 21% oxygen according to volume
2.10 mol | |
0.0093 mol | |
0.186 mol | |
0.210 mol |
Question 17 |
The increasing acidity order of phenol, p-methyl phenol. m-nitrophenol and p-nitrophenol is
phenol, p-methyl phenol, p-nitrophenol, m-nitrophenol | |
p-methyl phenol, phenol, m-nitrophenol, p-nitrophenol | |
p-methylphenol, m -nitrophenol, phenol, p-nitrophenol | |
m-nitrophenol, p-nitrophenol, phenol, p-methylphenol |
Question 18 |
The concentration unit will independent from
temperature
weight volume percentage | |
molarity | |
normality | |
molality |
Question 19 |
pH of 10 M HCI solution is
1 | |
0 | |
2 | |
less than zero |
Question 20 |
The number of geometrical isomers of [Pt(NH3)2C12]are
3 | |
4 | |
2 | |
1 |
Question 21 |
Maximum explosive is
NCI3 | |
PCI3 | |
AsCI3 | |
All of these |
Question 22 |
The purest form of iron is
white cast iron | |
grey cast iron | |
wrought iron | |
steel |
Question 23 |
Ethyl amine reacts with nitrous acid to give
ethyl nitrite | |
ethyl alcohol | |
nitro ethane | |
acetic acid |
Question 24 |
What is the stoichiometry coefficient of Ca in the following reaction?
Ca+AI3+ ------Ca2+Al
2 | |
1 | |
3 | |
4 |
Question 25 |
Ozone is useful in the purification of water because
it releases oxygen on dissociation | |
it does not give unpleasant smell like chlorine | |
it acts as bactericide and destroys the bacteria, fungi etc | |
All of the above |
Question 26 |
Internal energy is the sum of
kinetic energy and potential energy | |
all types of energy of system | |
energies of internal system | |
None of the above |
Question 27 |
In the presence of Fe/HC1, aniline obtains from which of the following?
Benzene | |
Nitrobenzene | |
Dinitrobenzene | |
None of these |
Question 28 |
Which of the following is a strong base?
Benzamide | |
Butanamine | |
Nitrobenzene | |
Benzene |
Question 29 |
On comparison of S and S2-,the S2- has
large radius and large size | |
small radius and large size | |
large radius and small size | |
small radius and small size |
Question 30 |
Which of the following is the second most electronegative element?
Oxygen | |
Nitrogen | |
Fluorine | |
Sulphur |
Question 31 |
Which of the following has the lowest ionization potential?
Oxygen | |
Nitrogen | |
Fluorine | |
Sulphur |
Question 32 |
If the diffusion rate of NH3 is double of X, then the molecular weight of X will be
68 | |
48 | |
12 | |
8 |
Question 33 |
The bond order of C—C bond of benzene.
1 | |
2 | |
between 1 and 2 | |
None of these |
Question 34 |
The decreasing order of bond length of following (A), Ethane (B) Ethene (C) Ethyne
A>B>C | |
B>A>C | |
C>B>A | |
C>A>B |
Question 35 |
What is the range of the size of colloidal particle?
1 to 100 nm | |
1 to 1000 cm | |
1 to 1000 mm | |
1 to 100 km |
Question 36 |
Which of the following element has the maximum electron affinity?
Fluorine | |
Chlorine | |
Sulphur | |
Xenon |
Question 37 |
Which is the most reactive inert gas?
He | |
Ne | |
Ar | |
Xe |
Question 38 |
Which type of bond presents in Xe molecule?
Covalent | |
Ion-dipole | |
van der Waals’ | |
Dipole-dipole |
Question 39 |
H2S is not a
reducing agent | |
acidic | |
oxidising agent | |
None of these |
Question 40 |
At constant temperature, the curve between p
and Vis
straight line | |
increasing curve | |
straight line with slope | |
None of the above |
Question 41 |
At constant temperature, on doubling the p and V, the reversible constant will become
constant | |
double | |
quarter | |
None of these |
Question 42 |
Generally the +3 oxidation state is
Ni (28) | |
Fe (26) | |
Zn (30) | |
Cu (29) |
Question 43 |
The atomic size increases on moving downward because
the number of electrons increases | |
the number of protons and neutrons increases | |
the number of protons increases | |
the number of protons. neutrons and electrons increases |
Question 44 |
The ionization energy decreases on moving
downward because
charge increases | |
atomic size increases | |
atomic size decreases | |
screening effect decreases |
Question 45 |
In electrolytic cell, the cathode acts as
oxidising agent | |
reducing agent | |
Either (a) or (b) | |
Neither (a) nor (b) |
Question 46 |
The order of reaction may be
zero | |
fraction | |
whole number | |
zero, fraction, whole number |
Question 47 |
Which has the maximum relative ionization power?
a-rays | |
B-rays | |
y-rays | |
X-rays |
Question 48 |
Which of the following is a vitamin?
Benzoic acid | |
Ascorbic acid | |
Oxalic acid | |
Formic acid |
Question 49 |
Which isomerism is shown by following
compounds?
CH3CH2CH2OH and CH3CH2OCH3
Position isomerism | |
Functional isomerism | |
Structural isomerism | |
Chain isomerism |
Question 50 |
The blister copper is
impure copper | |
alloy of copper | |
pure copper | |
copper with 1% impurity |
Question 51 |
Blood cells do not shrink in blood, because
blood is
hypotonic | |
isotonic | |
isomolecular | |
hypertonic |
Question 52 |
On isothermal expansion of ideal gas, its
internal energy increases | |
enthalpy increases | |
enthalpy becomes zero on decreasing | |
enthalpy remains unchanged |
Question 53 |
Which of the following compound does not
contain carboxylic group (—COOH)?
Acetic acid | |
Lactic acid | |
Benzoic acid | |
Picric acid |
Question 54 |
Which of the following compound will not obtain, on the distillation of calcium acetate with calcium formate?
Acetone | |
Formaldehyde | |
Acetaldehyde | |
Propionaldehyde |
Question 55 |
Glucose gives silver mirror test because it contains
—COOH group | |
a basic group | |
a ketonic group | |
an aldehyde group |
Question 56 |
Which compound is used to obtain teflon
polymer?
Difluoro ethane | |
Monofluoro ethane | |
Tetrafluoro ethene | |
Tetrafluoro ethane |
Question 57 |
According to VSEPR theory the geometry of water molecule is
octahedral | |
distorted tetrahedral | |
trigonal planar | |
trigonal bipyramidal |
Question 58 |
On adding a nor-volatile solution in a solvent. the vapour pressure of solvent reduces 10 mm of Hg. The mole fraction of solute is 0.2 in the solution. The vapour pressure of solution reduces to 20 mm of Hg on adding more solute in the solution. Now, what will the mole fraction of solvent in solution?
0.2 | |
0.4 | |
0.6 | |
0.8 |
Question 59 |
Which of the Following statement is false for ionic crystals?
The boiling point and melting point of ionic crystals are high. | |
These dissolves in water and other
solvents. | |
At low temperature, these are conductor of electricity in solid state. | |
Their cohesive energy is high. |
Question 60 |
8 g amount of a radioactive substance remains 0.5 g after 1 h. What is its half-life?
10 min | |
15 min | |
30 min | |
None of these |
Question 61 |
The quantity of ionisation of decinormal
solution of CH3COOH is 1.3%. What is the pH
value of this solution?
(log 1.3 =0.11)
2.89 | |
3.89 | |
4.89 | |
O.89 |
Question 62 |
A buffer solution is obtained on adding 10 mL
1.0 M CH3COOH and 20mL 0.5 MCH3COONa.
It is diluted to 100 mL by distilled water. If pka=4.76 forCH3COOH,then the pH value of buffer solution
2.76 | |
3.76 | |
4.76 | |
0.76 |
Question 63 |
Hess,s law is used in the determination of
heat of reaction | |
heat of formation | |
heat of bond fornation | |
All of the above |
Question 64 |
Which of the following unit of energy show the maximum value of energy?
Calorie | |
Joule | |
Erg | |
Electron—volt |
Question 65 |
Which of the following is the most electronegative?
Lead | |
Silicon | |
Carbon | |
Tin |
Question 66 |
Which of the following is the s—block element?
Aluminium | |
Chromium | |
Carbon | |
Potassium |
Question 67 |
The electronic configuration of a element is as
1s2,2s2 2p6,3s2,3p6,3d10,4s2,4p3
The property of this element is similar to
boron | |
oxygen | |
nitrogen | |
chlorine |
Question 68 |
Malachite is the ore of
Fe | |
Cu | |
Zn | |
Hg |
Question 69 |
For the purification of blister copper, the copper is melted in the furnance and stirring with green logs of woot. The purpose of this
to remove dissolved gases in blister copper | |
by taking the impurities on the surface to oxidise them | |
to increase the quantity of carbon in copper | |
the impurities of metal oxide are reduced by hydrocarbon gases evolved from wood |
Question 70 |
In the smelting of a metal ore. a substance is added, which forms a fusible product on mixing with impurities. The name of this substance is
slag | |
mud | |
gangue | |
flux |
Question 71 |
Which of the following has the highest melting
point?
Barium | |
Strontium | |
Calcium | |
Radium |
Question 72 |
The transition elements are generally
diamagnetic | |
paramagnetic | |
neither diamagnetic nor paramagnetic | |
both diamagnetic and paramagnetic |
Question 73 |
[(C6H5)2Pd(NCS)2]and [(C6H5)2Pd(SCN)2] are
linkage isomers | |
coordination isomers | |
ionisation isomers | |
geometrical isomers |
Question 74 |
Acetylene reacts with HCN in the presence of
Ba(CN)2 to give
vinyl cyanide | |
1. 1-dicvano ethane | |
1.2-dicvano ethane | |
None of the above |
Question 75 |
The substitution of chlorine becomes the most easiest in which of the following compound?
Chloro benzene | |
Vinyl chloride | |
Allyl chloride | |
p-chloro toluene |
Question 76 |
The order of acidic strength of phenol, p-cresol, m-nitrophenol and p-nitrophenol is
phenol, p—cresol, p-nitrophinol, m-nitrophinol | |
p-cresol, phenol, m-nitrophenol, p-nitrophinol | |
p-cresol, m-nitrophinol, phenol,
p-nitrophinol | |
m-nitrophenol, phenol, p-cresol,
p-nitrophenol |
Question 77 |
For which of the following metals, the electronic configuration of valence shell is not d6?
Fe (11) | |
Mn (11) | |
Co (111) | |
Ni (IV) |
Question 78 |
68 g sugar (C12H22O11) is dissolved In 1 kg of
water. What is the mole fraction of sugar?
0.018 | |
0.036 | |
0.0018 | |
0.0036 |
Question 79 |
The Ph of 0.1 M aqueous ammonia
(Kb =l.8x10-5)is
9.13 | |
10.13 | |
11.13 | |
12.13 |
Question 80 |
How much volume (in litre) of 3M NaOH is
obtained from 80 g NaOH? (Atomic mass of
Na = 23 u)
2.67 | |
1.34 | |
0.67 | |
0.33 |
Question 81 |
The initial concentration of sugar solution is
0.12 M. On doing fermentation the concentration of sugar decreases to 0.06 M in 10 h and to 0.045 M in 15 h. The order of the reaction is
0.5 | |
1.0 | |
1.5 | |
2.0 |
Question 82 |
The lowest pka value is for
phenol | |
m-cresol | |
o-cresol | |
p-cresol |
Question 83 |
For the conversion of CH2=CH2 into
HOOC. CH2CH2COOH, the minimum number
of steps required are
2 | |
3 | |
4 | |
5 |
Question 84 |
The total number of isomers for cyclic alcohol C4H7OH is
2 | |
3 | |
4 | |
5 |
Question 85 |
The reaction of C2H5Cl with Li and Cul gives
mainly
2-butene | |
1 ,3-butadiene | |
n-butane | |
n-butyl chloride |
Question 86 |
The correct order of stability is
Pentane < iso-pentane | |
iso-pentane < neo-pentane < pentane | |
neo-pentane< iso pentane < pentane | |
Pentane < neo-pentane < iso-pentane |
Question 87 |
The correct order of boiling point of ethyl dimethyl amine (A). n-butyl amine (B) and diethyl amine (C) is
B>C>A | |
B>A>C | |
A>B>C | |
C>B>A |
Question 88 |
The first ionisation energy difference is maximum for which pair?
Na, Mg | |
K, Ca | |
Rb, Sr | |
Cs, Ba |
Question 89 |
The ratio of third Bohr orbit radius and second Bohr orbit radius for the hydrogen atom is
0.5 | |
1.5 | |
0.75 | |
2.25 |
Question 90 |
The principal quantum number of Mn for those valence shell orbits in which electrons are filled
4, 3 | |
4, 4 | |
3,3 | |
5,4 |
Question 91 |
From the generally known oxidation states, the oxidation number is maximum for
Mn | |
Cu | |
Sn | |
Sc |
Question 92 |
Which of the following is correct order for density?
Cs>Rb>K>Na | |
Cs>Rb>Na>K | |
Rb > Cs > K> Na | |
Rb > Cs > Na > K |
Question 93 |
Which of the following would exert
maximum osmotic pressure?
Decinormal aluminium sulphate | |
Decinormal barium chloride | |
Decinormal sodium chloride | |
A solution obtained by mixing equal volumes of (b) and (C) and filtering |
Question 94 |
The extraction of which of the following metals involves bessemerisalion?
Fe | |
Ag | |
Al | |
Cu |
Question 95 |
The correct order of decreasing first
ionisation energy is
C > B> Be>Li | |
C > Be> B> Li | |
B > C> Be> Li | |
Be> Li> B> C |
Question 96 |
An example of natural biopolymer is
Thflon | |
Nylnn-66 | |
Rubber | |
DNA |
Question 97 |
Which of the following is known as invert
soap?
Pentaerythritol monostearate | |
Sodium stearyl sulphate | |
Trimethyl stearyl ammonium bromide | |
Ethoxylated nonyphenol |
Question 98 |
Le-blanc process is employed in the
manufacture of
baking soda | |
washing soda | |
potash | |
Plaster of Paris |
Question 99 |
Carbon content of
steel is in between those of cast iron
wrought iron | |
cast iron is in between those of steel and
wrought iron | |
wrought iron is in between those of steel
and cast iron | |
steel is higher than that of pig iron |
Question 100 |
The IUPAC name of acryldehyde is
prop-2-en-1-al | |
propenylaldehyde | |
but-2-en-l-al | |
propenal |
Question 101 |
Petrol for aviation purpose must contain
straight chain hydrocarbons | |
aromatic hydrocarbons | |
olefinic hydrocarbons | |
highly branched chain paraffins |
Question 102 |
The number of atoms contained in a fcc unit cell of a monoatomic substance is
1 | |
2 | |
4 | |
6 |
Question 103 |
Which one of the following will undergo meta-substitution on monochlorination?
Ethoxybenzene | |
Chlorobenzene
| |
Ethyl bcnzoate | |
Phenol |
Question 104 |
Propyne on passing through red hot copper tube forms
benzene | |
toluene | |
mesitylene | |
None of these |
Question 105 |
Which one of the following is mainly
responsible for depletion of ozone layer?
Methane | |
Carbon dioxide | |
Water | |
Chlorofluorocarbons |
Question 106 |
On warming with silver powder, chloroform
is converted into
acetylene | |
hexachloroethane | |
1, 1, 2, 2-tetrachloroethane | |
ethylene |
Question 107 |
Grignard reagent is not prepared in aqueous medium but prepared in ether medium, because
the reagent is highly reactive in ether | |
the reagent does not react with water | |
the reagent becomes inactive in water | |
the reagent reacts with water |
Question 108 |
The pH value of 0.001 M aqueous solution of
NaCI is
7 | |
4 | |
11 | |
unpredictable |
Question 109 |
Hydrogen molecule differs from chlorine
molecule in the following respect.
Hydrogen molecule is non-polar but
chlorine molecule is pobr | |
Hydrogen molecule is polar while chlorine molecule is non-polar | |
Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not | |
Hydrogen molecule cannot participate in coordinate bond formation but chlorine molecule can |
Question 110 |
Graphite is a
molecular solid | |
covalent solid | |
ionic solid | |
metallic solid |
Question 111 |
Point defects are present in
ionic solids | |
amorphous solid | |
molecular solids | |
liquids |
Question 112 |
Elevation in boiling point of an aqueous urea
solution is 0.52°C [Kb= 0.52° mol-1 kg].
Hence, mole fraction of urea in this solution is
0.982 | |
0.567 | |
0.943 | |
0.018 |
Question 113 |
Oxidation number of Cr in CrO5 is
+10 | |
+8 | |
+6 | |
+4 |
Question 114 |
The solubility of AgI in Nal solution is less
than that in pure water because
AgI forms complex with Nal | |
of common ion effect | |
solubility product of Agl is less | |
the temperature of the solution decrease |
Question 115 |
Chlorination of toluene in presence of light and heat followed by treatment with aqueous NaOH gives
o-cresol | |
p-cresol | |
mixture of o-cresol and p-cresol | |
benzoic acid |
Question 116 |
The order of first ionization energies of the elements Li, Be, B, Na is
Li> Be> B> Na | |
Be> B> Li> Na | |
Na>Li>B>Be | |
Be>Li>B>Na |
Question 117 |
Effective magnetic moment of Sc3+ ion is
1.73 | |
zero | |
5.92 | |
2.83 |
Question 118 |
An alkene having the molecular formula
C9H18 on ozonolysis gives 2, 2-dimethyl
propanal and butanone. The alkene is
2, 2, 2-trimethyl-3-hexene | |
2, 2, 6-trimethyl-3-hexane | |
2, 2, 4-trimethyl 3-hexene | |
2, 3, 4-trimethyl-2-hexene |
Question 119 |
The number of optical isomers of
CH3CH(OH)CH(OH)CHO is
2 | |
3 | |
6 | |
4 |
Question 120 |
The amine which will not liberate nitrogen on reaction with nitrous acid is
trimethyl amine | |
ethyl amine | |
sec-butyl amine | |
iso-propyl amine |
Question 121 |
Four successive members of the first row of transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
Vanadium (Z = 23) | |
Chromium (Z = 24) | |
Iron (Z = 26) | |
Manganese (Z =25) |
Question 122 |
Which of the following is not an ore of
magnesium?
Magnesite | |
Dolomite | |
Gypsum | |
Carnallite |
Question 123 |
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by
chemical leaching?
Argentite | |
Galena | |
Copper pyrite | |
Sphalerite |
Question 124 |
Soldiers of Napolean army which at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got covered to grey powder. This transformation is related to
an interaction with nitrogen of the air at very low temperatures | |
a change in the partial pressure of oxygen in the air | |
a change in the crystalline structure of tin | |
an interaction with water vapour contained in the humid air |
Question 125 |
The structure of XeOF4 is
planar | |
tetrahedral | |
square pyramidal | |
pyramidal |
Question 126 |
Atomic emission spectra of an element can not be used to
identify the atom | |
determine the mass number of the nucleus of atom | |
measure the difference in energy between pairs of stationary state of atom | |
All of the above |
Question 127 |
When glucose reacts with bromine water,
the main product is
acetic acid | |
saccharic acid | |
glyceraldehyde | |
gluconic acid |
Question 128 |
Amylopectin is a polymer of
a-D-glucose | |
a-D-fructose | |
lactose | |
amylose |
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