The linear expansivity of brass is 2 x 10^−5oC^−1. If the volume of piece of brass is 10cm³ at 0^oC. What will be its volume at 100^oC?

• A. 10.06cm³
• B. 10.04³
• C. 10.02³
• D. 10.20³

A cell of internal resistance r is connected to an external resistor R. The conductor for maximum power transfer is?

• A) R< r
• B) R = r
• C) R = 2r
• D) R > r

A bus travelling at 15ms^-1 accelerates uniformly at 4ms^-1, what is the distance covered in 10s?

• A. 150m
• B. 170m
• C. 350m
• D. 600m

The phenomenon of light bending round an obstacle is?

• A) diffraction
• B) refraction
• C) reflection
• D) polarization

In the circuit diagram below, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit

• A. 1.8A
• B. 1.0A
• C. 0.8A
• D. 0.3A

Steam from boiling water causes more damage on the skin than does boiling water because

• A. water has a high specific heat
• B. steam has latent heat of fusion
• C. the steam is at a highter temperature than the water
• D. steam brings heat more easily by convection

Which of the following is NOT a factor that can increase the rate of evaporation of water in a lake?

• A. increase in the pressure of the atmosphere
• B. rise in temperature
• C. increase in the average speed of the molecules of water
• D. increase in the kinetic energy of the molecules of water

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30V and 40V respectively. What is the voltage across the capacitor?

• A. 30V
• B. 70V
• C. 50V
• D. 40V

A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse

• A. 36.0\(\Omega\)
• B. 15.0\(\Omega\)
• C. 9.0\(\Omega\)
• D. 4.0\(\Omega\)

a) Listtwo properties of cathode rays.

(b) Explain how the intensity and energy of cathode rays may be increased