**Medical Entrance Physics Question Answers Practice Test.**

This Medical UG Entrance Physics MCQ Questions Answers for all India and state level medical entrance exams: This mock test** having 68 questions**, with four choices. On each click on Physics answers system will tell you where the answers is **correct or incorrect**. You can view this **Medical UG Entrance **test question details at the end of the quiz.

**This set of Physics** Questions Answers are applicable for any kind of Medical UG Entrance 2016. You can **practice** as much as you can to gather knowledge of how to answers Physics Objective Paper and this can **be a big factor for cracking Medical Entrance exam like AIPMT, AIIMS.**

## Physics Question Answers - Medical Entrance

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Question 1 |

**A substance breaks down by a stress of 10**

^{6}N/m2. If the density of the material of the wire is 3 x 10^{3}kg/m^{3}, then the length of the wire of the substance which will break under its own weight when suspended vertically, is:66.6m | |

60Mm | |

33,3m | |

30.0m |

Question 2 |

**An air column pipe closed at one end and open at the other end, resonates with a tuning fork and when 45 cm, 99 cm are two other lengths in between these values, the wavelength of sound in air column is:**

36cm | |

54cm | |

108cm | |

180cm |

Question 3 |

**If a source is transmitting electromagnetic waves of frequency 8.2 x 10**

^{6}Hz, the wavelength of electromagnetic wave transmitted from the source is:18.8m | |

36.5m | |

42.8m | |

58m |

Question 4 |

**In an electric heater 4 A current passes for 1 mm at potential difference of 250 V, the power of heater and the energy consumed will be respectively:**

1kW, 60 kj | |

0.5 kW, 30 kj | |

10 kW,600 kJ | |

none of these |

Question 5 |

**A stone released with zero velocity from the top of tower reaches the ground in 4 S. The height of the tower is about:**

20m | |

40m | |

80m | |

160m |

Question 6 |

**The efficiency of a Carnot engine operating between reservoirs maintained at temperatures 27° C and -123° C is:**

0.75 | |

0.4 | |

0.25 | |

0.5 |

Question 7 |

**Which radiations are used in treatment of muscles a the?**

Infrared | |

Ultraviolet | |

Microwave | |

X-rays |

Question 8 |

**An electron moves in a circular path of radius 15 cm in a magnetic field of intensity B=4x10**

^{-4}m/s T. The velocity of electron is:1.05x107m/s | |

5x106m/s | |

3.2x103m/s | |

zero |

Question 9 |

**A driving current of 2 A for 6 mm in a circuit is flowing then**

**100U**

**J of work is to be done. The en-if of the source in the circuit is**

1.38V | |

1.68V | |

2.03V | |

3.10V |

Question 10 |

**The half-life of radium is 1600 yr. The fraction of a sample of radium that would remain after 6400 yr is**:

1/4 | |

1/2 | |

1/8 | |

1/16 |

Question 11 |

**What is minimum length of a tube, open at both ends, that resonates with tuning fork of frequency 350 Hz? (velocity of sound in air = 350 m/s]**

50cm | |

l00cm | |

75cm | |

25cm |

Question 12 |

*A***magnetic field:**

always exerts a force on charged particle | |

never exerts a force on charged particle | |

exerts a force, if the charged panicle is moving across the magnetic field lines | |

exerts a force, if the charged particle is moving along the magnetic field lines |

Question 13 |

**If the energy of a photon corresponding to a wavelength of 6000 A is 3.32 x**

**10**

^{-19},**the photon energy for a wavelength of 4000 A will be:**

1.4eV | |

4.9eV | |

3.1eV | |

1.6eV |

Question 14 |

**The rms**

**speed of a group of 7**

**gas molecules**

**having speeds (6, 4, 2, 0, - 2, -4, - 6) m/s is:**

1.5 m/s | |

3.4 m/s | |

9m/s | |

4m/s |

Question 15 |

**In junction diode, the holes are due to:**

missing electron | |

proton | |

neutron | |

none of the above |

Question 16 |

**The half-life of a radioactive substance is 40 yr. How long will it take to reduce to one-fourth of its original amount and what is the value of decay constant respectively?**

40 yr, 0.9173/yr | |

90 yr, 9.017/yr | |

80 yr, 0.0173/yr | |

none of these |

Question 17 |

**A semiconductor is cooled from T**

_{1}Kelvin to T_{2}Kelvin, then its resistance: will not change | |

will increase | |

will decrease | |

none of these |

Question 18 |

**A square wire frame of size**

*L***is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, the force acting on the frame will be:**

2TL | |

4TL | |

8TL | |

10 TL |

Question 19 |

**The Bohr model of atoms:**

assumes that the angular momentum of electrons is quantized | |

uses Einstein’s photo electric equation | |

predicts continuous emission spectra for atoms | |

predicts the same emission spectra for all types of atoms |

Question 20 |

**The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eyepiece is found to be 20 cm. The focal lengths of lenses are:**

18 cm, 2 cm | |

11 cm, 9 cm | |

10 cm, 10 cm | |

15 cm, 5 cm |

Question 21 |

**A truck and a car are moving with equal velocity. On applying brakes, both will stop after certain distance, then**

truck will cover less distance before stopping | |

car will cover less distance before stopping | |

both will cover equal distance | |

none of these |

Question 22 |

**In a nuclear reactor:**

moderator is used to slow down the neutrons | |

cadmium rods are used to slow down the neutrons | |

coolant is used to slow down the neutrons | |

moderator is used to control the neutrons |

Question 23 |

**A cylinder contains 10 kg of gas at pressure of**

**10**

^{7}**N/m**

^{2}. The quantity of gas taken out of the cylinder if final pressure is 2.5 x**10**

^{6}N/m^{2}, is:7.5kg | |

15.2kg | |

10.5kg | |

none of these |

Question 24 |

**A transformer is having 2100 turns in primary and 4200 turns in secondary. An AC source of 120 V. 10 A is connected to its primary. The secondary voltage and current are**

240 V, 5A | |

120V, 10A | |

240 V, 10A | |

120 V1 20A |

Question 25 |

**In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20J of heat and 8J of work is done on the gas. If the initial internal energy of the gas was 30J, the final internal energy will be:**

18J | |

9J | |

4.5J | |

36J |

Question 26 |

**A black body is heated from 27°C to 927°C. The ratio of radiations emitted will be**

1:256 | |

1:64 | |

1:4 | |

1 : 16 |

Question 27 |

**The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature:**

decreases exponentially with increasing band gap | |

increases exponentially with increasing band gap | |

decreases with increasing temperature | |

is independent of the temperature and the band gap |

Question 28 |

**In a Young’s experiment, if the distance between the slits is halved and the distance of screen from the slit is doubled, the fringe width will be:**

four times | |

doubled | |

halved | |

same |

Question 29 |

**Which one of the following is the dimensionless quantity?**

Planck’s constant | |

Dielectric constant | |

Solid angle | |

Strain |

Question 30 |

**In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out 30 J of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be:**

30J | |

20J | |

60J | |

40J |

Question 31 |

**The angular momentum of a system of particles is not conserved:**

when a net external force acts upon the system | |

when a net external torque is acting upon the system | |

when a net external impulse is acting upon the system | |

none of the above |

Question 32 |

**The first overtone of a stretched wire of given length is 320 Hz. The first harmonic is:**

320 Hz | |

160 Hz | |

480 Hz | |

640 Hz |

Question 33 |

**The frequency of a tuning fork is 384/s and velocity of sound in air is 352 m/s. Find how far the sound has traversed while fork completes 36 vibrations.**

33m | |

16.5m | |

11 m | |

22m |

Question 34 |

**An exploding star is called:**

nova | |

supernova | |

black hole | |

neutron star |

Question 35 |

**Slow neutrons can cause fission in:**

uranium-238 | |

uranium-235 | |

hydrogen | |

thorium |

Question 36 |

**A man of weight 80 kg is standing in an elevator which is moving with an acceleration of 6 m/s**

^{2}**in upward direction. The apparent weight of the man will be (g = 10 m/s**

^{2}):148 N | |

128 N | |

138 N | |

none of these |

Question 37 |

**Magnetic permeability is maximum for:**

paramagnetic substances | |

ferromagnetic substances | |

diamagnetic substances | |

all of the above |

Question 38 |

**A rectangular coil of 20 turns and area of cross- section 25 cm**

^{2}has a resistance of 100*SI.*If a magnetic Held which is perpendicular to the plane of coil changes at a rate of 1000 T/s, the current in the coil is:1A | |

50A | |

0.5A | |

5A |

Question 39 |

**A 15 g ball is shot from a spring gun whose spring has a force constant of 600 N/m. The spring is compressed by 5 cm. The greatest possible horizontal range of the ball for this compression is: (g**

**= 10 m/s**

^{2}*)*

6.0m | |

10.0m | |

12.0m | |

8.0m |

Question 40 |

**A child swinging on a swing m a sitting position, stands up, then the time period of the swing will:**

increase | |

decrease | |

remain same | |

increase if the child is long and decrease if the child is short |

Question 41 |

**The heat of 110 j is added to a gaseous system whose internal energy is 40 J, then the amount of external work done will be:**

140J | |

70J | |

40 J | |

none of these |

Question 42 |

**A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is l0 V. The potential at a distance of 2 cm from the centre of the sphere is:**

zero | |

10V | |

4V | |

1O/3’V |

Question 43 |

**A convex lens forms a real image of an object for its two different positions on the screen. If height of the images in two cases are 8 cm and 2 cm, then the height of the object will be:**

2cm | |

4cm | |

8 cm | |

16 cm |

Question 44 |

**A body is accelerated from rest by applying a force of 30 N. The momentum of the body after 2swillbe:**

60 kg m/s | |

120 kg m/s | |

67.5kg m/s | |

30 kg m/s |

Question 45 |

**The conduction current is same as displacement current when source is:**

AC only | |

DC only | |

both AC and DC | |

neither DC nor AC |

Question 46 |

**An engine pumps up 100 kg of water trough a height of 10 m in 5 s. Given that the efficiency of the engine is 60%. If g =10 ms**

^{-2}, the power of the engine**is:**

3.3 kW | |

0.33 kW | |

0.033 kW | |

33 kW |

Question 47 |

**In a pure electric conductor the width of the forbidden band is:**

5 to 10eV | |

2.1eV | |

0.8eV | |

zero |

Question 48 |

**A coil has an inductance of 0.03 H. The emf induced, when the current in the coil changes at a rate of 200 A/s, will be:**

15V | |

12V | |

9C | |

6V |

Question 49 |

**The escape velocity from earth is 11.2 km s**

^{1}Another planet is having mass 1000 times and radius 10 times that of the earth, then escape velocity at that planet will be: 11.2 km/s | |

112km/s | |

1.12 km/s | |

1120 km/s |

Question 50 |

**Work function of lithium and copper are respectively 2.3 and 4.0 eV. Which one of the metals will be useful for the photoelectric cell working with visible light? (h=6.6x10**

^{-34}J-s, c=3x10^{8}m/s)

Lithium | |

Copper | |

Both | |

None |

Question 51 |

**The peak value of an alternating current frequency 50 Hz is 14.14 A. Find the rms value of current, and how much time will the current take in reaching from zero to maximum value?**

10 A, 0.005s | |

15 A, 0.05s | |

12 A, 0.05s | |

8 A, 0.Ols ‘ |

Question 52 |

**A car travels half of the distance with constant velocity of 30 km/h and another half with a constant velocity of 50 km/h along a straight line. The average velocity of the car in km/h is:**

38.7 | |

42 | |

37.5 | |

40 |

Question 53 |

**A train of length ISO m is going towards north direction at the speed of 10 m/s. A parrot flies at a speed of 5 m/s towards south direction parallel to the railway track then the time taken by the parrot to cross the train is equal to:**

15s | |

l0s | |

12s | |

8s |

Question 54 |

**In a hydrogen atom, the electron revolves round the nucleus in an orbit of radius 0.53 x 10**

^{-10 }m. The electric potential produced by the nucleus at the position of the electron is17.2V | |

23.6V | |

13.6V | |

27.2V |

Question 55 |

**Two rods having thermal conductivity in the ratio of 5:3 having equal lengths and equal cross-sectional area are joined face to face. If the temperature of the free end of the first rod is 100° C and free end of second rod is 20°C, then the temperature of the junction is: ?**

70°C | |

50°C | |

60°C | |

90°C |

Question 56 |

**The setting sun looks red because of:**

external reflection | |

internal reflection | |

scattering of light | |

none of the above |

Question 57 |

**A bullet is tired from a gun with a speed of 1000 rn/s in order to hit a target 100 m away. The height above the target the gun should be aimed will be : (The resistance of air is negligible and g = 10**

**m/s**

^{2})

25 cm | |

12 cm | |

9cm | |

5crn |

Question 58 |

**When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic Held at its centre will become:**

four times | |

same | |

half | |

double |

Question 59 |

**Velocity of light in diamond, glass and water decreases in the following order:**

water > glass diamond | |

diamond > glass > water | |

diamond > water> glass | |

water > diamond > glass |

Question 60 |

**A black body radiates energy at the rate of 1 x 10**

^{s}/sm2 at a temperature of 227°C.The temperature to which it must be heated, so that it radiates energy at the rate of 1 x 10^{9}j/sm^{2}is:5000 K | |

5000°C | |

500 K | |

500°C |

Question 61 |

**In a certain charge distribution, all Points having zero potential can be joined by a circle an S. Points inside S have positive potential points outside S have negative potential. A positive charge, which is free to move, is placed inside S:**

it will remain in equilibrium | |

it can move inside S, but it cannot cross S | |

it must cross S at some time | |

it may move, but will ultimately return to its starting point |

Question 62 |

**A vertical straight conductor carries a current vertically upwards. A point P lies to the east of it at a small distance and another point Q lies to the west at the same distance. The magnetic field at P is**

greater than at Q | |

same as at Q | |

less than at Q | |

greater or less than at Q depending upon the strength of current |

Question 63 |

**An underwater sonar source operating at a frequency of 60 kHz directs its beam towards the surface. If velocity of sound in air is 330 m/s, wavelength and frequency of the waves in air are:**

5.5 mm, 60 kHz | |

330 m, 60 kHz | |

5.5 mm, 30 kHz | |

5.5 mm, 80 kHz |

Question 64 |

**The magnetic Held at a distance r from a long wire carrying current i is 0.4 T. The magnetic field at a distance 2 r is:**

0.2T | |

0.8T | |

0.1 T | |

1.6 T |

Question 65 |

**In Young’s double slit experiment, the fringe width is found to be 0.4 mm. If the whole**

**apparatus is immersed in water of refractive index 4/3, without disturbing the geometrical arrangement, the new fringe width will be:**

0.30mm | |

0.40mm | |

0.53mm | |

450 urn |

Question 66 |

**Photons of energy 5.5eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0eV. The stopping potential required for these electrons are:**

5.5V | |

1.5V | |

9.5V | |

4.0V |

Question 67 |

**Magnetic permeability is maximum for:**

paramagnetic substances | |

ferromagnetic substances | |

diamagnetic substances | |

all of the above |

Question 68 |

**The light of wavelength 5000 A is incident on a metal whose work function is 2eV, the maximum kinetic energy of the photoelectron will be**

0.2eV | |

0.47eV | |

1.5eV | |

2eV |

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