1
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

A convex lens made of glass (refractive index = 1.5) has focal length 24 cm in air. When it is totally immersed in water (refractive index = 1.33), its focal length changes to

A

96 cm

B

72 cm

C

24 cm

D

48 cm

2
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

Two bodies A and B of equal mass are suspended from two massless springs of spring constant k1 and k2, respectively. If the bodies oscillate vertically such that their amplitudes are equal, the ratio of the maximum velocity of A to the maximum velocity of B is

A

$ \sqrt{\frac{k_2}{k_1}} $

B

$ \sqrt{\frac{k_1}{k_2}} $

C

$ \frac{k_2}{k_1} $

D

$ \frac{k_1}{k_2} $

3
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

Match List - I with List - II.

List - I List - II
(A) Young’s Modulus (I) M L-1 T-1
(B) Torque (II) M L-1 T-2
(C) Coefficient of Viscosity (III) M-1 L3 T-2
(D) Gravitational Constant (IV) M L2 T-2

Choose the correct answer from the options given below:

A
(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
B
(A)-(IV), (B)-(II), (C)-(III), (D)-(I)
C
(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
D
(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
4
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

Match List - I with List - II.

List - I List - II
(A) Magnetic induction (I) Ampere meter2
(B) Magnetic intensity (II) Weber
(C) Magnetic flux (III) Gauss
(D) Magnetic moment (IV) Ampere meter

Choose the correct answer from the options given below:

A

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

B

(A)-(III), (B)-(II), (C)-(I), (D)-(IV)

C

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

D

(A)-(I), (B)-(II), (C)-(III), (D)-(IV)

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