3 April Physics JEE Main Question Paper 2025 (Available) with Answer Key

Q.No.

Questions

Answers

1

The ratio of intensities of two coherent is 1:9. The ratio of the maximum to the minimum intensities is

4:1

Excess pressure inside bubble A is half of that of bubble B. Find the ratio of volume of bubble A to bubble B.

In a resonance tube experiment at one end, resonance is obtained at two consecutive lengths / ₁ = 100 cm and / ₂ = 140 cm. If the frequency of the sound is 400 Hz, the velocity of sound is

Physical quantity S is given as S = pq/r ³ √ t Find to percentage change in S if percentage change in p, q, r and t are 1, 1, 3 and 2, respectively.

In a medium of refractive index 2, the frequency of light is 5 x 10 ¹⁴ Hz, the wavelength of the light is

A capacitor C ₁ = 100 pF is connected to a 60 V cell and then disconnected. C ₁ is now connected to an unchanged capacitor C ₂ such that the final potential across C ₁ becomes 20 V. Find C ₂ .

7

A bulb rated 100 W, 220 V connected to an ac supply of 220 V. Find the peak current in the bulb.

0.64 A

Statement-l: O ^2- and H ⁺ are projected in a magnetic field perpendicular to the field with same speed. The radius of curvature of O ^2- will be less than H ⁺ .
Statement-ll: e ^- and p ⁺ are projected in a magnetic field perpendicular to the field with same speed. The radius of curvature of e ^- will be more the proton.

9

The pressure of an ideal gas is increased by 0.4% keeping the volume constant. Find the initial temperature of the gas if there is a 1°C rise in temperature.

250 K

In two situations given in figures (i) and (ii) current through R is l ₁ and l _2, respectively. If E ₁ = 2 V, r ₁ = 1 Ω, E ₂ = 1 V, r ₂ = 2 Ω, R = 6 Ω then find l ₁ / l ₂ .

A block of mass 10 kg is moving with speed 3 m/s collides with a spring connected to another block of mass 5 kg initially at rest. Find the compression in spring when both move with same speed.

The torque experienced by a magnetic dipole in a uniform magnetic field is 80√3 N.m. If the angle between the magnetic moment and the magnetic field is 60°, the potential energy of the dipole is

The truth-table of the circuit shown is

Match the following:

Find the distance of the object from the left surface, if the distance of the final image from the left surface is 200 cm.

The displacement of a particle is given as x = C ₀ (t ² − z) + C(t − z) ² , where t is time in seconds and C ₀ and C are constants the acceleration of the particle is

In a Hydrogen atom, an electron makes a transition from n ^th orbit to 4 ^th excited state. Energy released in this transition 0.33 eV, find the value of n.

A block of mass 1 kg moves from x = 0.1 m to x = 1.9 m. The speed of block at x = 0.1 is 10 m/s. A resistive force F = -10x acts or the block. Find speed of block (in m/s) when it is at x = 1.9 m.

A projectile is fired with an initial velocity u, such that range of the projectile is 3 times the maximum height. If the range of the projectile is Nu ² /25g, Find value of N.

A solid ball of diameter 3.6 mm and having density 7825 kg/m ³ . This ball has terminal velocity 2.56 × 10 ^-2 m/s in a liquid of density 925 kg/m ³ ​​​​​​. Find coefficient (in pascal sec) of viscosity.

Q.No.

Question

Answers

1

An ideal gas with an adiabatic exponent 1.5, initially at 27°C is compressed adiabatically from 800 cc to 200 cc. The final temperature of the gas is

600 K

2

In YDSE, light of intensity of 4 I and 9 I passes through two slits respectively. Difference of maximum and minimum intensity of interference pattern is

24 I

3

An ammeter having resistance 240 Ω is connected in the given circuit as shown. Find current through the ammeter.

5 mA

4

A thin uniform wire of length 25 m and area of cross-section 5 mm ² has resistivity 2 × 10 ^–6 Ω-m. If the wire is bent to form a circle, the resistance across diametrically opposite points is

2.5 Ω

5

A sphere of mass 20 kg is pulled with force of 49 N as shown in diagram. Acceleration of sphere assuming no slipping.

3.5 m/s ²

6

A current carrying wire is bent as shown in the figure. Find magnetic field at centre O of the semi-circles. (Take R ₁ = 4π and R ₂ = 6π)

8.3 I * 10 ^-9 T

7

A biconvex lens is having the radius of curvature of 10 cm and 15 cm. If focal length of the lens is 12 cm find refractive index of material of the lens.

3/2

8

The figure below shows an oscillating system of two blocks and a spring. The horizontal surface is smooth, and the contact between the blocks is rough with coefficient of static friction μ.
Considering that the blocks of mass m is always stationary relative to M, choose the correct option regarding the statement below:
(A) Maximum frictional force between blocks is µ mg.
(B) Time period of oscillation is 2π √ m+M/k
(C) Friction between the blocks at any instant is µ(m + M)g

Only B option is correct.

9

A point source of power 450 W is emitting light in all direction. Radiation pressure at distance of 2m from the source is nearly

3 * 10 ^-8 Pa

10

Choose the correct option.
a. Gravitational potential                (i) M ^-1 L ³ T ^-2
b. Gravitational constant                (ii) ML ² T ^-2
C. Acceleration due to gravity        (iii) M ⁰ L ² T ^-2
d. Potential energy                        (iv) M ⁰ LT ^-2

a(iii), b(i), c(iv), d(ii)

11

Capacitors with dielectric are shown in figure (symmetric situation). Find C ₁ /C ₂

4ε ₁ ε ₂ /(ε ₁ +ε ₂ ) ²

12

From a horizontal surface a particle is projected with a speed u. Which of the following correctly represents the variation of maximum height above the surface attained by the particle as the angle of projection is varied?

13

The electric potential at the surface of a shell of radius 10 cm is 120 V. Find the potential at its centre, at r = 5 cm from centre and at r = 15 cm from centre.

120 V, 120 V, 80 V

14

Find the colour corresponding to photons of energy 3 eV.

Blue

15

An object is dropped from height S. At a point its kinetic energy is three times its potential energy. Find its height from ground and speed at that point.

S/4, √ 3gS/2

16

Truth table of logical circuit is given. Then identify the correct circuit.

17

Find force (in millinewton) on current carrying wire of length / = 4 m, and current of 8 A placed perpendicular to the magnetic field of ẞ = 0.15 Τ.

4800 mN

18

A container of height 1.6 m is having a small hole at height of 0.9 m from ground then find the speed of efflux from the hole [use g = 9.8 m/s ² ]

3.71 m/s

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