A lead bullet of mass 0.05 kg is fired with a velocity of 200 m/s into a lead block of mass 0.95 kg. Given that the lead block can move freely, the final kinetic energy after impact is

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

The electromagnetic waves that are sensitive to temperature changes are

• A. X-rays
• B. Gamma-rays
• C. Ultra-violet rays
• D. Infra-red rays

A piece of metal of relative density 5.0 weighs 60N in air. Calculate its weight when fully immersed in water

• A. 4N
• B. 5N
• C. 48N
• D. 60N

The diagram below show the positions of a cone. The position which can be described as neutral equilibrium is represented as

• A) Z only
• B) X only
• C) Y and Z
• D) Y and X

Lenz's law of electromagnet states that

• A. the induced charge is constant for a fixed change of force
• B. a force is exerted on a current-carrying conductor in a magnetic field
• C. the magnitude of the induced e.m.f in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
• D. the induced current in a conductor is in such a direction as to oppose the change producing it

The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

• A. critical energy
• B. ionization energy
• C. work function
• D. planck's constant

A radioactive substance has a half-life of 20 hours. What traction of the original radioactive nuclide will remain after 80 hours?

• A. 1/32
• B. 1/16
• C. 1/8
• D. 1/4

(a). State: (a) two applications of electrolysis in an industry

(b) one application of electrolysis in a school laboratory.

A ball bearing is projected vertically upwards from the ground with a velocity of 15ms^-1. Calculate the time taken by the ball to return to the ground [g = 10ms^-1]

• A. 1.5s
• B. 3.0s
• C. 5.0s
• D. 7.5s

A converging lens has a focal length of 5cm. Determine its power

• A. +20.0
• B. +0.2
• C. -20.00
• D. -0.2