Two mirrors M1 and M2 are inclined at right angles as shown above calculate the angle of reflection of the ray of light at M2

• A. 30°
• B. 45°
• C. 60°
• D. 90°

An object is situated within the Earth's gravitational field. Which of the following factor does not affect the acceleration of free fall g?

• A. the distance of the object from the centre of the earth
• B. the latitude of the earth on which the object is situated
• C. rotation of the earth
• D. the mass of the object

In his first attempt, a long jumper took off from the spring board with a speed of 8 ms\(^{-1}\) at 30° to the horizontal. He makes a second attempt with the same speed at 45° to the horizontal. Given that the expression for the horizontal range of a projectile is \(\frac{u^2 sin 2\theta}{g}\) where all the symbols have their usual meanings, show that he gains a distance of 0.8576 m in his second attempt. [g = 10ms\(^{-2}\)]

A body accelerates uniformly from rest at 2ms^?2. Calculate the velocity after traveling 9m

• A. 36ms^?1
• B. 18ms^?1
• C. 6ms^?1
• D. 4.5ms^?1

(a) What is surface tension?

(b) State two methods by which the surface tension of a liquid can be reduced.

In photo-emission, the number of photo-electrons ejected per second depends on the

• A. frequency of the beam
• B. work function of the metal
• C. threshold frequency of the metal
• D. intensity of the beam

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms^-1 from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is (take g = 10ms^-2)

• A. 5 J
• B. 10 J
• C. 15 J
• D. 20 J

An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the

• A. earth casts a shadow on the moon
• B. moon casts a shadow on the sun
• C. moon is between the sun and the earth
• D. earth is between the sun and the moon

The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?

I. Lagging the Calorimeter

II. Ensuring that only S.I units are used

III. Weighing the calorimeter, the lid and the stirrer.

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

The S.I unit of heat is

• A. joule
• B. kelvin
• C. watt
• D. ampere