Mechanics - Physics Previous Year Asked Questions with Answers (Bengali)

GATE 2024Mechanics

1.

A body of mass 5 kg moves with velocity 4 m/s. Enter its momentum in kg·m/s.

#Numerical answer type

View Answer

Answer: 20

Explanation:

Momentum $p = mv = 5 \times 4 = 20$ kg·m/s.

JEE MAIN 2024Mechanics

2.

A projectile is launched at 30° to the horizontal with initial velocity 20 m/s. What is its horizontal range? (g = 10 m/s²)

Formula:

$R = \frac{u^2 \sin 2\theta}{g}$

A

20 m

B

40 m

C

20√3 m

D

10√3 m

View Answer

Correct Answer: C — 20√3 m

Explanation:

$R = \frac{u^2 \sin 2\theta}{g} = \frac{20^2 \times \sin 60°}{10} = \frac{400 \times \frac{\sqrt{3}}{2}}{10} = 20\sqrt{3}$ m.

SSC CGL 2023Mechanics

3.

If the radius of the Earth were doubled (mass unchanged), what would happen to the value of g (acceleration due to gravity) at the surface?

A

g would double

B

g would remain the same

C

g would become one-fourth

D

g would halve

View Answer

Correct Answer: C — g would become one-fourth

Explanation:

$g = GM/R^2$ . If R doubles, $g$ becomes $GM/(2R)^2 = g/4$ . So g becomes one-fourth.

SSC MTS 2024Mechanics

4.

Which type of friction acts on a body that is stationary and has a force applied to it but has not yet started moving?

A

Kinetic friction

B

Rolling friction

C

Static friction

D

Viscous friction

View Answer

Correct Answer: C — Static friction

Explanation:

Static friction acts on a body at rest when an external force is applied but motion has not started. It opposes the tendency of motion.

Mechanics in Physics : PYQs with Answers

Formula: