The length of a simple pendulum is increased by a factor of four. By what factor is its period increase?

• A. 0.5°
• B. 2
• C. 2°
• D. 4

The electrons in a cathode-ray tube are produced by?

• A. heating a metal filament.
• B. ionization of the air.
• C. applying a magnetic field to the y-plates.
• D. applying an electric field to the x-plates.

Which of the following statements about the atom is/are correct? I. Energy is needed to remove electrons from an atom II. Particles in the nucleus of an atom are bound together by strong forces. III. A large amount of energy is required to separate the particles in the nucleus of an atom. IV. When the nucleus of a uranium atom is split, the energy released accounts for the difference in the masses of the products and the parent nucleus

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

zener diode is used for?

• A) current amplification
• B) power amplification
• C) voltage regulation
• D) energy conversion

Given that the gravitational constant is 7 X 10^-11 Nm2kg^-2, what is the force of attraction between 10⁶kg mass of lead hanging one metre away from a 10³kg mass of iron?

• A. 7 x10^-20N
• B. 7 x 10^-5N
• C. 7x10^-2N
• D. 7x10³N

Which of the following materials has an increase in resistance with temperature?

• A) water
• B) metals
• C) wood
• D) electrolyte

Which of the following is a stringed instrument?

• A. Flute
• B. Trumpet
• C. Piano
• D. Drum

(a) Distinguish between perfectly elastic collision and perfectly inelastic collision.

(b) Sketch a distance — time graph for a particle moving in a straight line with:

(i) uniform speed;

(ii) variable speed.

(c) A body starts from rest and travels distances of 120, 300 and 180m in successive equal time intervals of 12 s. During each interval the body is uniformly accelerated. (i) Calculate the velocity of the body at the end of each successive time interval.

(ii) Sketch a velocity-time graph for the motion.

Which of the following characteristics of light determines its colour?

• A. velocity
• B. wavelength
• C. amplitude
• D. intensity

A stone is projected horizontally from the top of a tower with a speed of 5ms-1. It lands on the ground level at a horizontal distance of 20m from the foot of the tower. Calculate the height of the tower. (g = 10ms\(^{-2}\))