A sheet of paper is placed in the path of the following radiations: I. Alpha particles II. Beta particles III. Gamma rays. Which of the radiations will pass through the sheet of paper?

• A. I only
• B. II only
• C. I and II only
• D. II and III only

Where can a man place his face to get an enlarged image when using a concave mirror to shave?

• A. Between the centre of curvature and the principal focus
• B. At the principal focus
• C. Between the principal focus and the pole
• D. At the centre of curvature

A tuning fork sounds louder when its stem is pressed against a table top than when held in air because

• A. a larger mass of air is set vibrating by the table top
• B. the whole table vibrates in resonance
• C. the whole table has acquired a larger frequency
• D. the fork and table have the same frequency

Thunder is usually heard some seconds after lightning is observed because

• A. the human eye is more sensitive to light than the ear to sound
• B. sound and light travel in different media
• C. thunder occurs after lightning
• D. light travels faster than sound

The diagram below illustrates a mode of vibration of a wire of length 125 cm. The speed of the waves along the wire is 120 ms^-1. Use the diagram to answer questions 2 and 3.

• A. 1.00m
• B. 0.75m
• C. 0.25m
• D. 0.50m

In a slide wire bridge, the balance is obtained at a point 25cm from one end of wire 1m long. The resistance to be tested is connected to that end and a standard resistance of 3.6Ω is connected to the other end of the wire. Determine the value of the unknown resistance

• A. 3.2Ω
• B. 1.4Ω
• C. 3.21Ω
• D. 1.2Ω

The melting point of a substance is equivalent to its

• A. Vapour Pressure
• B. Solidification Temperature
• C. Liquidification Temperature
• D. Solidification Pressures

A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?

• A. its acceleration decreases before terminal velocity is attained
• B. when terminal velocity is attained the acceleration of the fluid becomes zero
• C. its velocity increases before terminal velocity is attained
• D. there is no resultant force on the ball before it attains terminal velocity

X rays can be used in the study of crystal structure because they

• A. have a very long-reaching wavelength
• B. have extremely short wavelength
• C. are invisible
• D. are very fast

The mass of an empty density bottle is 30g. When filled with a liquid, the mass of the bottle and the liquid is 40g. On heating the filled bottle through 40ºc, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid

• A. 6.25 x 10K^-1
• B. 6.25 x 10^-3K^-1
• C. 2.50 x 10^-3K^-1
• D. 2.50 x 10^-4K^-1
A. 6.25 x 10K^-1
• B. 6.25 x 10^-3K^-1
• C. 2.50 x 10^-3K^-1
• D. 2.50 x 10^-4K^-1