¹⁴₇N +⁴₂He →¹⁷₈O + X

In the equation above, the particles X is

• A) a proton
• B) a neutron
• C) an α - particle
• D) a β - particle

An inelastic collision takes place between ball of known masses, just before the collision one of the ball is moving with a known velocity while the other is stationary. Which of the following physical quantities can be determined from the information given?

• A. speed of each of the ball after collision
• B. kinetic energy of each ball after collision
• C. total momentum of the ball after collision
• D. total momentum of the two ball after collision

The energy contained in a wire when it extended by 0.02m by a force 500 N is

• A. 5J
• B. 10J
• C. 10³J
• D. 10⁴J

One of the most important applications of bi-metallic strip is found in the construction of

• A. a thermostat
• B. an altimeter
• C. a thermocouple
• D. a hydrometer

Which of the following statements about static friction is correct? It

• A. is independent of the nature of the surface in contact
• B. depends on the area of surface in contact
• C. depends on the relative motion between the surface in contact
• D. depends on the weight of the moving body

The ice point on the absolute scale of temperature is

• A. 0K
• B. 32K
• C. 100K
• D. 273K

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.

Determine the frequency of the waves

• A. 240Hz
• B. 24Hz
• C. 192Hz
• D. 286Hz

(a) Explain wave-particle duality of light.

(b) Illustrate your answer in (a) with observable phenomena.

A boy in a barber's shop sits between two parallel mirrors. The number of images observed by him will be

• A. Infinite
• B. Ten
• C. Eight
• D. Forty

Which of the following statements about evaporation is not correct?

• A. The rate of evaporation of a liquid varies with temperature
• B. The molecules of an evaporating liquid have an average speed
• C. Evaporation occurs when faster molecules escape from the surface of a liquid
• D. Evaporation takes place inside a liquid.