Which of the following statements is correct about resonance? Resonance occurs when a body

• A. vibrates with its natural frequency
• B. is forced to vibrate on its own natural frequency by another body at the same vibration
• C. vibrates at the frquency of the body causing the vibration
• D. vibrates with an irregular frequency

(a) State two properties of cathode rays.

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

Consider the wave equation: y=10sin(x?50t), What does the number 10 represent?

• A. Acceleration
• B. Speed
• C. Amplitude
• D. Wavelength

The percentage of the original nuclei of the sample of a radioactive substance left after 5 half - lives is

• A. 8%
• B. 5%
• C. 3%
• D. 1%

An arrow of mass 0.1kg moving with a horizontal velocity of 15ms^-1 is shot into a wooden block of mass 0.4kg lying at rest on a smooth horizontal surface. Their common velocity after impact is

• A. 15.0 ms^-1
• B. 7.5 ms^-1
• C. 3.8 ms^-1
• D. 3.0 ms^-1

(a) Explain how a gas can be made to conduct electricity.

(b) Name the electric charge carriers in gases.

A diver steps off a diving platform that is 10m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's

• A. gravitational potential energy
• B. total mechanical energy
• C. kinetic energy
• D. momentum

The S.I unit of power is

• A. N
• B. Pa
• C. W
• D. J

When light of a certain frequency is incident on a metal surface, no photoelectrons are emitted. If the frequency of the light is increased, what happens to the stopping potential?

• A. The stopping potential does not change.
• B. The stopping potential decreases.
• C. The stopping potential can either increase or decrease, depending on the intensity of the light.
• D. The stopping potential increases.

A gas occupies a certain volume at 27°C. At what temperature will its volume be three times the original volume assuming that its pressure remains constant?

• A. 81°C
• B. 162°C
• C. 354°C
• D. 627°C