JEE Main Physics previous year questions (Chapter Wise)

Joint Entrance Examination (JEE) Main is conducted to offer admissions to interested candidates in undergraduate engineering programs at NITs (National Institutes of Technology), IIITs (Indian Institutes of Information Technology) and other centrally funded technical institutions (CFTIs) located across the country. JEE Main 2018 offline (pen-paper) exam will be held on April 8 while the online exam will be held on April 15 and 16. In this article you will get all JEE Main physics previous year questions which are asked.

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JEE Main 2018 registration has commenced from December 1 and will conclude on January 1, 2018, previous year questions will help you prepare for the level that can be expected in the JEE Main 2018. Mentioned below are chapter wise questions from previous years.

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JEE Main Physics previous year questions

Year 2014 questions

Units, Dimensions and Errors

1. A wire of length 1 = 6±0.06cm and radius r = 0.5 ± 0.005cm and mass m = 0.3 ± 0.003g. Maximum percentage error in density is

(a) 4

(b) 2

(c) 1

(d) 6.8
UPES - JEE Main Physics previous year questions (Chapter Wise)

2. Which of the following sets have different dimensions?

(a) Pressure, Young’s modulus, stress

(b) Emf, potential difference, electric potential

(c) Heat, work done, energy

(d) Dipole moment, electric flux, electric field

Physics Question

Practical Physics

1. Vernier caliper has 1 mm makes 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 mm

d) 0.2 mm

2. In a Searle’s experiment, the diameter of the wire as measured by a screw gauge of least count 0.001 cm is 0.050 cm. The length, measured by a scale of least count 0.1 cm, is 110.0 cm. When a weight of 50 N is suspended from the wire, the extension is measured to be 0.125 cm by a micrometer of least count 0.001 cm. Find the maximum error in the measurement of Young’s modulus of the material of the wire from this data

3. The side of a cube is measured by vernier calipers (10 divisions of a vernier scale coincide with 9 divisions of main scale, where 1 division of main scale is 1 mm). The main scale reads 10 mm and first division of vernier scale coincides with the main scale. Mass of the cube is 2.736 g. Find the density of the cube in appropriate significant figures.

Kinematics

1. A boat which has a speed of 5 km/hr in still water crosses a river of width 1km along the shortest possible path in 15 minute. The velocity of the river in the shortest time. The velocity of river water in km/hr is

2. A small block slides, without friction, down an inclined plane starting from rest. Let Sn be the distance travelled from time t = (n – 1) to t = (n.) Then Sn/Sn+1  is

Laws of Motion

A block P of mass m is placed on a horizontal frictionless plane. A second block of same mass m is placed on it and is connected to a spring of  spring constant k. The two blocks are pulled by distance A. Block Q oscillates without slipping. What is the maximum value of frictional force between the two blocks?

Work, Energy and Power

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that

a) Its velocity is constant

b) Its acceleration is constant

c) Its kinetic energy is constant

d) It moves in a circular path

Centre of Mass, Momentum and Impuls

Two particles A and B, initially at rest, move to­ wards each other under mutual force of attraction. At the instant when the speed of A is v and the speed of B is 2v, the speed of the centre of mass of the system is

a) 3v

b) V

c) 1.5v

d) Zero

Rotational Motion

A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved?

(a) Centre of the circle

(b) On the circumference of the circle

(c) Inside the circle

(d) Outside the circle

Gravitation

If g is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is

(a) 1/2mgR

(b) 2 mgR

(c) mgR

(d) 1/4 mgR

Properties of Matter

A metal ball immersed in alcohol weighs W1 at 0°C and W2 at 50° C . The co-efficient of cubical expansion of the metal is less than that of the alcohol. Assuming that the density of the metal is large compared to that of alcohol, it can be shown that

a) W1>W2

b) W1=W2

c) W1

d) All of these

Heat and Thermodynamics

From the following statements, concerning ideal gas at any given temperature T, select the correct one (s).

a) The co-efficient of volume expansion at constant pressure is the same for all ideal gases

b) The average translational kinetic energy per molecule of oxygen gas is 3kT, k being Boltzmann constant

c) The mean-free path of molecules increases with increase in the pressure

d) In a gaseous mixture, the average translational kinetic energy of the molecules of each component is different

Simple Harmonic Motion

1.Two bodies M and N of equal masses are suspended from two separate mass less springs of spring con­stants k1 and k2 respectively. If the two bodies os­cillate vertically such that their maximum veloci­ties are equal, the ratio of the amplitude of vibra­tion of M to that of N is

2. A particle executes simple harmonic motion be­tween x = -A and x = +A. The time taken for it to go from 0 to A/2 is T1 and to go from A/2 to A is T2. Then

a) T1 < T2

b) T1 > T2

c) T1 = T2

d) T1 = 2T2

Current Electricity
1. A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if

a) Both the length and the radius of the wire are halved.

b) Both the length and the radius of the wire are doubled

c) The radius of the wire is doubled.

d) The length of the wire is doubled.

2. The temperature coefficient of resistance of a wire is 0.00125 per °C- at 300 K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at

a) 1154 K

b) 1100 K

c) 1400 K

d) 1127 K

Year 2015 questions

Units, Dimensions and Errors

The dimensions of the quantities in one (or more) of the following pairs are the same. Identify the pair(s)

(a) Torque and work

(b) Angular momentum and work

(c) Energy and Young’s modulus

(d) Light year and wavelength

Practical Physics

1. A student performs an experiment to determine the Young’s modulus of a wire, exactly 2m long, by Searle’s method. In a particular reading, the student measures the extension in the length of the wire to be 0.8mm with an uncertainty of ± 0.05mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an uncertainty of ± 0.01mm- Take g = 9.8m/s2 (exact). The Young’s modulus obtained from the reading is

2. Students I,II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table. Least count for length =0.1cm Least count for time = 0.1s

Kinematics

1. A ball A ball of mass 0.2 kg rests on a vertical of heights 5 m. A bullet of mass 0.01 kg, travelling with a velocity V m/s in a horizontal direction, hits the centre of the ball. After the collision, the ball and bullet travel independently. They 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

2. Particles P and Q of mass 20 g and 40g respectively are simultaneously projected from points A and B on the ground. The initial velocities of P and Q make 45° and 135° angles respectively with the horizontal AB as shown in the figure. Each particle has an initial speed of 49m/s. The separation AB is 245m. Both particle travel in the same vertical plane and undergo a collision. After the collision, P retraces its path. Determine the position of Q when it hits the ground. How much time after the collision does the particle Q take to reach the ground? Take g = 9.8m / s2

Laws of Motion

  1. A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in

Work, Energy and Power

A wind-powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to

a) V

b) V2

c) V3

d) V4

Centre of Mass, Momentum and Impulse

Statement -1 In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision because Statement -2 In an elastic collision, the linear momentum of the system is conserved

(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; Statement-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

Rotational Motion

A cubical block of side L rests on a rough horizontal surface with coefficient of friction p. A horizontal force F is applied on the block as shown. If the coefficient of friction is sufficiently high so that the block does not slide before toppling, the minimum force required to topple the block is

a) Infinitesimal

b) mg/4

c) mg/2

d) mg (l-p)

Gravitation

If the distance between the earth and the sun were half its present value, the number of days in a year would have been

(a).64.5

(b) 129

(c) 182.5

(d) 730

Properties of Matter

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied?

a) Length = 50 cm, diameter = 0.5 mm

b) Length = 100 cm, diameter = 1 mm

c) Length = 200 cm, diameter = 2 mm

d) Length = 300 cm, diameter = 3 mm

Heat and Thermodynamics

The average transnational kinetic energy and the root mean square speed of molecules in a sample of oxygen gas at 300 K are 6.21 x 10-21J and 484 m/s respectively. The corresponding values at 600 K are nearly (assuming ideal gas behavior)

a)12.42 x10-21J,968 m/s

b) 8.78 x 10-21 J,684 m/s

c) 6.21 x 10-21 J,968 m/s

d)12.42 x 10-21J,684 m/s

Simple Harmonic Motion

For a particle executing SHM the displacement x is given by x=A cos ut, Identify the graph which represents the variation of potential energy (PE) as a function of time t and displacement x

a) 5/6

b) 6/5

c) 1

d) 4/5

Current Electricity

1. In the circuit shown in fig the heat produced in the 5 ohm resistor due to the current flowing through it is 10 calorie per second. The heat generated in the 4 ohm resistor is

a)1 calorie/sec

b) 2 calorie/sec

c) 3 calorie/sec

d) 4 calorie/sec

2. A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

a) Each of them increases

b) Each of them decreases

c) Copper increases and germanium decreases

d) Copper decreases and germanium increases.

3. A steady current flows in a metallic conductor of no uniform cross-section. The quantity / quantities constant along the length of the conductor is / are

a) Current, electric field and drift speed

b) Drift speed only

c) Current and drift speed

d) Current only

4. In the given circuit, with steady current, the potential drop across the capacitor must be

a) V

b) V/2

c) V/3

d) 2V/3

5. Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room tem­perature, 100 W, 60 W and 40 W bulbs have filament resistance R100, R60 and R40, respectively, the relation between these resistances is.

Year 2016 questions

Units, Dimensions and Errors

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%

Practical Physics

A screw gauge having 100 equal divisions and a pitch of length 1 mm is used to measure the diameter of a wire of length 5.6 cm. The main scale reading is 1 mm and 47th circular division coincides with the main scale. Find the curved surface area of wire in cm2 to appropriate significant figure. (use pi = 22/7)

Kinematics

In 1.0 sec. a particle goes from point A to point B, moving in a semicircle of radius 1.0 m as shown in the figure. The magnitude of the average velocity is :

a) 3.14 m/sec

b) 2.0 m/sec

c) 1.0 m/sec

d) Zero

Laws of Motion

1. A car is moving in a circular horizontal track of radius 10m with a constant speed of lOm/s. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the rod with the track is (g = 10 m/s2)

a) Zero

b) 30°

c) 45°

d) 60°

2. A block of mass 0.1 kg is held against a wall applying a horizontal force of 5N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is

a) 2.5N

b) 0.98N

c) 4.9N

d) 0.49N

Work, Energy and Power

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then the long piece will have a force constant of

a) (2/3) k

b) (3/2) k

c) 3k

d) 6k

Centre of Mass, Momentum and Impulse

A point mass of 1 kg collides elastically with a stationary point of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with a speed of 2 ms4. Which of the following statements(s) (are) correct for the system of these two masses?

(a)Total momentum of the system is 3 kg ms-1

(b)Momentum of 5kg mass after collision is 4kg ms-1

(c)Kinetic energy of the centre of mass is 0.75 J

(d)Total kinetic energy of the system is 4 J

Rotational Motion

Two point masses of 0.3kg and 0.7kg are fixed at the ends of a rod which is of length 1.4m and of negligible mass. The rod is set rotating about an axis perpendicular to its length with a uniform angular speed. The point on the rod through which the axis should pass in order that the work required for rotation of the rod is minimum, is located at a distance of

(a) 0.42 m from the mass of 0.3kg

(b) 0.70 m from the mass of 0.7kg

(c) 0.98m from the mass of 0.3kg

(d) 0.98m from the mass of 0.7kg

Gravitation

1. An artificial satellite moving in a circular orbit around the earth has total (K.E. + P.E.)energyE0. Its potential energy is

(a)- E0

(b) 1.5 E0

(c) 2 E0

(d) E0

2. A geo-stationary satellite orbits around the earth in a circular orbit of radius 36,000km. Then, the time period of a spy satellite orbiting a few hundred km above the earth’s surface (R g^ =6,400km) will approximately be

a) (l/2) hr

b) 1 hr

c) 2 hr

d) 4 hr

Properties of Matter

A vessel contains oil (density = 0.8 g/cm3) over mercury (density = 13.6 g I cm3). A homogeneous sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of the sphere in g/cm3

a) 3

b) 6.4

c) 7.2

d) 12.8

Heat and Thermodynamics

The intensity of radiation emitted by the Sun has its maximum value at a wavelength of 510 nm and that emitted by the North star has the maximum value at 350 nm. If these stars behave like black bodies, then the ratio of the surface temperatures of the Sun and the North Star is

a) 1.46

b) 0.69

c) 1.21

d) 0.83

Simple Harmonic Motion

A wooden block performs SHM on a frictionless surface with frequency, v0. The block carries a charge +Q on its surface. If now a uniform electric field E is switched – on as shown, then the SHM of the block will be E

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

Current Electricity

1. 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 2cm 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

2. Capacitor C1 Of capacitance 1 micro-farad and capacitor C2 of capacitance 2 microfarad are separately charged fully by a common battery. The two capacitors are then separately allowed to discharge through equal resistors at time t = 0

a) The current in each of the two discharging circuits is zero at t=0

b) The currents in the two discharging circuits are equal but not zero.

c) The currents in the two discharging circuits at t=0 are unequal.

d) Capacitor C1 loses 50% of its initial charge sooner than C2 loses 50% of its initial charge.

3. When a potential difference is applied across, the current passing through

a) An insulator at 0 K is zero

b) A semiconductor at 0 K is zero

c) A metal at 0 K is finite

d) A p – n junction diode at 300 K is finite, if it is reverse biased

Year 2017 questions

Units, Dimensions and Errors

The pairs of physical quantities that have the same dimensions in (are)

(a)Reynolds number and coefficient of friction

(b)Curie and frequency of a light wave

(c)Latent heat and gravitational potential

(d)Planck’s constant and torque

Kinematics

A river is flowing from west to east at a speed of 5 meter per minute. A man on the south bank of the river, capable of swimming at 10 meter per minute in still water, wants to swim across the river in the shortest time. He should swim in a direction.

a) Due north

b) 30° east of north

c) 30° west of north

d) 60° east of north

Laws of Motion

1. A ship of mass 3 x 107 kg initially at rest is pulled by a force of 5 x 104 N through a distance of 3m. Assuming that the resistance due to water is negligible, the speed of the ship is

a) 1.5m/s

b) 60 m/s

c) 0.1 m/s

d) 5 m/s

2. During peddling of a bicycle, the force of friction exerted by the ground on the two wheels is such that it acts

a) In the backward direction on the front wheel and in the forward direction on the rear wheel

b) In the forward direction on the front wheel and in the backward direction on the rear wheel

c) In the backward direction on both, the front and the rear wheels

d) In the forward direction on both, the front and the rear wheels.

Work, Energy and Power

1. If a machine is lubricated with oil

a) The mechanical advantage of the machine increases

b) The mechanical efficiency of the machine increases

c) Both its mechanical advantage and efficiency increase

d) Its efficiency increases, but its mechanical advantage decreases.

Centre of Mass, Momentum and Impulse

Two blocks of masses 10 kg and 4 kg are con­nected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is ?

These are the question you need to solve. There are helpful to you, most of the time you will see in the question paper 20-30% are directly asked from the previous year question papers.