# JEE Main Online Mock Practice Test

IIT JEE Main 2017 (IIT Joint Entrance Exam – Main) JEE Main Online Mock Practice Test.

JEE Main Engineering Test MCQ Questions Answers for the admission in B.tech: This mock test having 25 question each, with four choices. On each click on answers system will tell you where the answers is correct or incorrect. You can view this JEE Main Test question are available for Physics and Chemistry details at the end of the quiz. You can also download JEE Main Previous Year Question Papers.

This JEE Main Entrance Exam questions answers are applicable for any kind of engineering entrance and B.Arch Entrance exam. You can practice as much as you can to gather knowledge of how to answers JEE Main Test critical type papers in short time and this can be a big factor for cracking All India Joint Entrance level exam.

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## JEE Main Online Practice Test - Physics

Congratulations - you have completed JEE Main Online Practice Test - Physics. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
 Question 1
Three concentric metallic spherical shells of radii 1?, 21?, 31?, are given charges Q, Q , respectively. It is found that the surface charge densities on (lie outer sur1icus of the shells are equal. Then, the ratio of the charges given i. the shells, Q1 : Q2 : Q.3, is
 A 1:2:3 B 1:3:5 C 1:1:9 D 1:8:18
 Question 2
A student performed the experiment to measure the speed of sound in air using resonance air-column method, Two resonances in the air-column ware obtained lowering The water level. The resonance with the shorter air-column is the first resonance and that with the longer air-column is the second resonance. Then.
 A the intensity of the sound heard at the first resonance was more than that at the second resonance B the prongs of the tuning fork were kept in a horizontal plane above the resonance tube C the amplitude of vibration of the ends of the prongs is typically around 1 cm D the length of the air-column at the first resonance was somewhat shorter than 1/4th of the wavelength of the sound in air
 Question 3
Consider a thin square sheet of side L and thickness t. made of a material of resistMtv p. The resistance between two opposite faces, shown by the shaded areas iii the figure is
 A directly proportional to L B directly proportional to t C Independent of L D independent of t
 Question 4
A Vernier calipers has 1 mm marks on the main scale. It has 20 equal divisions on the Vernier scale which match with 16 main scale divisions. For this Vernier calipers. the least count is
 A 0.02 mm B 0.05 mm C 0.1 nun D 0.2 mm
 Question 5
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is
 A 8.50 kHz B 8.25 kHz C 7.75 kHz D 7.50 kHz
 Question 6
A ball of mass 0.2 kg rests on a vertical post of height 5 m. A bullet of mass 0.01 kg, traveling with a velocfty V m/s in a horizontal direction, hits the centre of the ball. After the collision, the ball and bullet travel independently. The ball hits the ground at a distance of 20 m and the bullet at a distance of 100 m from the foot of the post. The initial velocity V of the bullet is
 A 250 m/s B 250J m/s C 400 m/s D 500 m/s
 Question 7
43. A ball is dropped from a height of 20 m above the surface of water in a lake. Tue refractive index of water is 4/s. A fish inside the lake, in the line of fall of 11w hall, is looking at the ball. At in instant, when the ball is l2.8 m above the water surface, the fish aces the speed of ball as
 A 9 m/s B 12 m/s C 16 m/s D 21.33 m/s
 Question 8
45. The figure shows the P-V plot of an ideal gas taken through a cycle ABCI)A. The part AIW is a semi-circle and CDA is half of an ellipse. Then,
 A the process during (1w path A —, B is isothermal B heat flows out of the gas during the path B — C — 1) C work done during the path A B , C is zero D positive work is done by the gas in the cycle ABCDA
 Question 9
58. A real gas behaves like an ideal gas if its
 A pressure and temperature are both high B pressure and temperature are both low C pressure is high and temperature is low D pressure is low and temperature is high
 Question 10
40. A hollow pipe of length 0.8 m Is closed at one end. At its open end a 0.5 m long uniform string is vibrating in its second harmonic and it resonates with the fundaniental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 ms, the mass of the suing is
 A 5 grams B 10 grams C 20 grains D 40 grams
 Question 11
29. A meter bridge is set-up as shown, to determine an unknown resistance ‘X’ using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of ‘X’ is
 A 10.2 ohm B 10.6 ohm C 10.8 ohm D 11.1 ohm
 Question 12
The density of a solid ball is to be determined in an experiment. The diameter of the ball is measured with a screw gauge, whose pitch is 0.5 mm and there are 50 divisions on the circular scale. The reading on the main scale is 2.5 mm and that on the circular scale is 20 divisions. If the measured mass of the ball has a relative error of 2%, the relative percentage error in the density is
 A 0.9% B 2.4% C 3.1% D 4.2%
 Question 13
Two ina11 particles of equal masses start moving in opposite directions from a point. A in a horizontal circular orbit. Their tangential velocities are u and 2u, respectively. a shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at A those two particles will again reach the point A?
 A 4 B 3 C 2 D 1
 Question 14
Under the Influence of the Coulomb field of charge +Q. a charge─ q is moving around it in an elliptical orbit. Find out the correct statement.
 A The angular momentum of the charge —q is constant B The linear momentum of the charge —q is constant C The angular velocity of the charge q is constant D The linear speed of the charge —q is constant
 Question 15
An AC voltage source of vaiiable angulai- frequency (0 and fixed amplitude V0 is connected In series with a capacitance C and an electric bulb of resistance R (inductance zero). When o is increased
 A the bulb glows dimmer B the bulb glows brighter C total impedance of the circuit is unchanged D total impedance of the circuit increases
 Question 16
A biconvex lens of focal length 15 cm is in front of a plane mirror. The distance between the lens and the mirror is 10 cm. A small object is kept at a distance of 30 cm from the lens. The frn.al image is
 A virtual and at a distance of 16 cm from the mirror B real and at a distance of 16 cm from the mirror C virtual and at a distance of 20 cm from the mirror D real amid at a distance of 20 cm from the mirror
 Question 17
A 2 if capacitor is charged as shown in figure. The percentage of its stored energy dissipated after the switch S is turned to position 2 is
 A 0% B 20% C 75% D 80%
 Question 18
A wooden block performs SHM on a frictionless surface with frequency, v0. The block carries a charge +Q on its surtace. If now a uniform electric field E is switched-on as shown, then the SHM of the block will be
 A of the same frequency and with shifted mean position. B of the same frequency and with the same mean position. C of changed frequency and with shifted mean position. D of changed frequency and with the same mean position.
 Question 19
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that
 A linear momentum of the system does not change in time kinetic B energy of the system does not change in time C angular momentum of the system does not change in time D potential energy of the system does not change in time
 Question 20
A student uses a simple pendulum of exactly im length to determine g. the acceleration clue to gravity. He uses a stop watch with the least count of 1 sec for this and records 40 seconds for 20 oscillations. For this observation, which of the following statement(s) is (are) true ?
 A Error T in measuring T. the time period. Is 005 seconds B Error / T in measuring T. the time period, is 1 second C Percentage error in the determination of g is 5% D Percentage error in the determination of g is 2.5%
 Question 21
A block of mass 2 kg is free to move along the x-axis. It is at rest and from = 0 onwards it is subjected to a time-dependent force FYtJ in the x direction. The force F) varies with t as shown in the figure. The kinetic energy of the block after 4.5 seconds is
 A 4.50 J B 7.50 J C 5.06 J D 14.06 J
 Question 22
A metal rod of length ‘L’ and mass ‘m’ is pivoted at one end. A thin disk of mass ‘M’ and radius ‘R’ (
 A Restoring torque in case A = Restoring torque in case B B Restoring torque in case A < Restoring torque in case B C Angular frequency for case A > Angular frequency for case B. D Angular frequency for case A
 Question 23
Which of the following statement(s) is/are correct?
 A If the electric field due to a point charge varies as r25 instead of r2, then the Gauss law will still be valid. B The Gauss law can be used to calculate the field distribution around an electric dipole. C If the electric field between two point charges is zero somewhere, then the sign of the two charges is the same. D The work done by the external force in moving a unit positive charge from point A at potential VA to point B at potential V8 is (VB — VA).
 Question 24
A student performed the experiment of determination of focal length of a concave mirror by u-v method using an optical bench of length 1.5 meter. The ica1 length of the mirror used is 24 cm. The maximum error in the location of the image can be 0.2 cm. The 5  sets of (u, v) values recorded by the student (in cm) are : (42, 56), (48, 48), (60, 40), (66, 33), (78, 39). The data sets) that cannot come from experiment and is (are) incorrectly recorded, is (are)
 A (42. 56) B (48, 48) C (66, 33) D (78, 39)
 Question 25
A point mass of 1 kg coffides elastically with a stationary point mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 ms-1. Which of the following statement(s) is (are) correct for the system of these two masses ?
 A Total momentum of the system is 3 kg ms-1 B Momentum of 5 kg mass after collision is 4 kg ms C Kinetic energy of the centre of mass Is 0.75 J D Total kinetic energy of the system is 4 J
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## JEE Main Online Practice Test - Chemistry

Congratulations - you have completed JEE Main Online Practice Test - Chemistry . You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
 Question 1
The species having bond order different from that in CO is
 A NO- B NO4 C CN. D N2
 Question 2
Consider a reaction aG + bH ‘ Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is
 A 0 B 1 C 2 D 3
 Question 3
Extraction of zinc from zinc blende is achieved by
 A electrolytic reduction B roasting followed by reduction with carbon C roasting followed by’ reduction with another metal D roasting followed by self-reduction
 Question 4
The reagent(s) for the following conversion, ? H H is/are
 A alcoholic KOH B alcoholic KOH followed by NaNH2 C aqueous KOH followed by NaNH2 D Zn/CH3OH
 Question 5
STATEMENT-I: Alkali metals dissolve in liquid ammonia to give blue solutions. because STATEMENT-2: Alkali metals in liquid ammonia give solvated species of the type IM(NH3 )) (M = alkali metals).
 A Statement-i is True, Staternent-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True; Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 6
The number of structural isomers for C6H14 is
 A 3 B 4 C 5 D 6
 Question 7
STATEMENT.1: Glucose gives a reddish-brown precipitate with Fehling’s solution. because STATEMENT-2: Reaction of glucose with Fehling’s solution gives CuO and gluconic acid.
 A Statement-i is True, Statcment-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Stat.ement-2 is True
 Question 8
The percentage of p-character in the orbitals forming P—P bonds in P4 is
 A 25 B 33 C 50 D 75
 Question 9
STATEMENT-1: Molecules that are not superimposable on their mirror images are chiral. because STATEMENT2: All chiral molecules have chiral centres.
 A Statement-i is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 10
When 20 g of naphthoic acid (C11H802) is dissolved in 50 g of benzene (K 1.72 K kg mol’), a freezing point depression of 2 K is observed. The vant Hoff factor (i) is
 A 0.5 B 1 C 2 D 3
 Question 11
STATEMENT-1: Band gap in germanium is small. because STATEMENT-2: The energy spread of each germanium atomic energy level is infinitesimally small.
 A Statement-i is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statcmcnt-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 12
STATEMENT-1 : Boron always forms covalent bond. because STATEMENT-2 : The small size of B3 favours formation of covalent bond.
 A Statement-I is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statcment-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statemcnt-2 is False D Statement-i is False, Statement-2 is True
 Question 13
The differential equation = “ determines a family of circles with
 A variable radii and a fixed centre at (0, 1) B variable radii and a fixed centre at (0, —1) C fixed radius 1 and variable centres along the x-axis D fixed radius 1 and variable centres along the y-axis
 Question 14
STATEMENT-1 : In water, orthoboric acid behaves as a weak monobasic acid. because STATEMENT-2: In water, orthoboric acid acts as a proton donor.
 A Statement-i is True, Statemcnt-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 15
The letters of the word COCIIIN are permuted and all the permutations are arranged in an alphabetical order as in an English dictionary. The number of WOrd8 that appear before the word COCIIIN is
 A 360 B 192 C 96 D 48
 Question 16
STATEMENT-1: p—Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. because STATEMENT-2: o—Hydroxybenzoic acid has intramolecular hydrogen bonding.
 A Statement-i is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-I is True, Statement-2 is False D Statement-I is False, Statement-2 is True
 Question 17
Considertheplanes 3x-6y-2z =15 and 2x+y—2z =5. STATEMENT-1: The parametric equations of the Line of intersection of the given planes are x 3+141, y = 1+ 2:, z = 15t. because STATEMENT-2: The vector 141+2) + 15h is parallel to the line of intersection of given planes.
 A Statement-1 is True, Statoment-2 is True; St.atement-2 is a correct explanation for Statement-1 B Statement-1 is True, Stat.ement-2 is True; Statemcnt-2 is NOT a correct explanation for Statement-1 C Statement-1 is True, Statement-2 is False D Statement-1 is False, Statement-2 is True
 Question 18
STATEMENT-1 : Micelles are formed by surfactant molecules above the critical micellar concentration (CMC). because STATEMENT-2 The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
 A Statement-i is True, Statement-2 is True; Stat..ement-2 is a correct explanation for Statement-i B Statement-i is True, St.atement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-i is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 19
Let f(x)=2+cosx for all real x. STATEMENT-1: For each real C, there exists a point c in Lt, I + n such that (c) = 0. because STATEMENT-2: f(t) f(t + 2#) for each real 1.
 A Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1 B Statement-1 is True, Statement-2 is True; Statcment-2 is NOT a correct explanation for Statement-1 C Statement-1 is True, Statement-2 is False D Statement-1 is False, Statement-2 is True
 Question 20
Argon is used in arc welding because of its
 A low reactivity with metal B ability to lower the melting point of metal C flammability D high calorific value
 Question 21
Lines L1 : y — x = C) and L2 : 2x + y = C) intersect the line L3 : y + 2=0 at P and Q, respectively. The bisector of the acute angle between L1 and L2 intersects L3 at R. STATEMENT-I: The ratio PR : RQ equals 2I : STATEMENT-2: In any triangle, bisector of an angle divides the triangle into two similar triangles.
 A Statement-i is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-i B Statement-i is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-i C Statement-I is True, Statement-2 is False D Statement-i is False, Statement-2 is True
 Question 22
The structure of Xe03 is
 A linear B planar C pyramidal D T-shaped
 Question 23
The line y = x meets y = kex for k ≤ 0 at
 A no point B one point C two points D more than two points
 Question 24
XeF4 and XeF6 are expected to be
 A oxidizing B reducing C unreactive D strongly basic
 Question 25
The total number of moles of chlorine gas evolved is
 A 0.5 B 1 C 2 D 3
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