### Physics Past Questions

1
The inner diameter of a test tube can be measured accurately using a
• A. micrometer screw guage
• B. pair of dividers
• C. metre rule
• D. pair of vernier calipers
2

Two bodies have masses in the ratio 3:1. They experience forces which impart to them acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced.

• A. 1 : 4
• B. 2 : 1
• C. 2 : 3
• D. 2 : 5
3

Particles of mass 10^-2kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad-1. If the radius of the blade is 0.2m, the centripetal force is

• A. 2 N
• B. 20 N
• C. 200 N
• D. 400 N
4

A lead bullet of mass 0.05kg is fired with a velocity of 200ms$$^{-1}$$ into a lead block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is

• A. 50 J
• B. 100 J
• C. 150 J
• D. 200 J
5

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is

(take g = 10ms-2)

• A. 5 J
• B. 10 J
• C. 15 J
• D. 20 J