Which of the following waves can propagate through a vacuum?

• A. High velocity sound waves
• B. Ultrasonic waves
• C. Acoustic waves
• D. Infra-red waves

Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

• A. He cannot see distant objects clearly
• B. Rays of light from a close object are focused in front of his retina
• C. His eye ball is too long
• D. Parallel rays of light are focused behind his retina

Which of the following phenomena is called photoelectric effect?

• A. high energy electrons impinge on a metalic anode which then emits photons
• B. a high energy photon emits photons as it slowed down
• C. a metal absorbs quanta of light and then emits electrons
• D. Two electrons are created from a quantum of light

Which of the following units is equivalent to the watt?

• A. kgms^-2
• B. kgm²s^-3
• C. kgm²s^-2
• D. kgm²s^-1

A particle is projected horizontally at 10 ms\(^{-2}\) from the top of a tower 20 M high. Calculate the horizontal distance travelled by the particle when it hits the level ground. [g= 10 ms\(^{-2}\)

A stroboscope can be used to make the wave appear …………..

• A. Stationary
• B. In motion
• C. Dipper
• D. Ripple

Which of the following statements about a moving object is correct?

• A. When accelerating, the resultant force acting on it must be equal to zero.
• B. There must always be a non-zero resultant force acting on it.
• C. At a steady velocity, the resultant force acting on it must be equal to zero
• D. At a steady velocity, the air resistance must be equal to zero.

The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in decree Celsius when the mercury meniscus is the 14cm mark

• A. 20^oC
• B. 30^oC
• C. 34^oC
• D. 70^oC

An alternating voltage with a frequency of 50Hz has a period of

• A. 0.02s
• B. 0.05s
• C. 0.20s
• D. 0.50 s

Which of the following operations does not represent an action of a force field?

• A. falling of a mango fruit from the tree
• B. picking of nails using a bar magnet
• C. repulsion of two like charges
• D. pushing of a wheel-barrow on a level gound