An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because

• A. ebonite has a negative charge while glass has a positive charge
• B. ebonite has a positive charge while glass has a negative charge
• C. both have negative charges
• D. both have positive charges

The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be

• A. doubled
• B. halved
• C. four times as great
• D. one-fourth as much

The absolute zero temperature is defined as the temperature at which

• A. thermal motion ceases
• B. the temperature of a gas is 273°C
• C. ice melts
• D. the volume of a real gas is maximum

In the fig below if the atmospheric pressure is 760mm, the pressure of the chamber G is

• A. 660mm
• B. 690mm
• C. 830mm
• D. 860mm

(a) Using a suitable diagram, explain how the following can be obtained from a velocity-time graph (i) acceleration; (ii) retardation; (iii) total distance covered.

(b) Show that the displacement of a body moving with uniform acceleration a is given by \(s = ut + \frac{1}{2} at^{2}\) where u is the velocity of the body at time t = 0.

(c) A particle moving in a straight line with uniform deceleration has a velocity of 40ms\(^{-1}\) at a point P, 20ms\(^{-1}\) at a point Q and comes to rest at a point R where QR = 50m. Calculate the: (i) distance PQ; (ii) time taken to cover PQ; (iii) time taken to cover PR.

A particle in circular motion performs 30 oscillation in 6 seconds. Its angular velocity is

• A. 5 rad/s
• B. 6 rad/s
• C. 5π rad/s
• D. 10π rad /s

(a) (i) Define uniform acceleration.

(ii) Write an equation that relates linear velocity, angular velocity and radius

of path in circular motion.

(b) Two forces 30 N and 40 N act at right angles to each other. Determine by scale drawing, the magnitude and direction of the resultant force,.using a scale of 1 cm to 5 N.

(c) Explain why ships are usually refilled with sand and water after they have been emptied of their cargo.

(d) A crate of drinks of mass 20 kg is placed on a plane inclined at 30° to the horizontal. If the crate slides down with a constant speed, calculate the:

(i) co-efficient of kinetic friction;

(ii) magnitude of the frictional force acting on the crate. [ g = 10 ms\(^{-2}\)]

Which of these statements are TRUE of pressure in liquids? i. pressure acts equally in all direction. ii. pressure decreases with depth. iii. pressure at the same level of a liquid is the same. iv pressure is dependent on the cross-sectional area of the barometer tube

• A. i, iii only
• B. i, ii, iii only
• C. i, iii, and iv only
• D. i, ii, iii and iv

Masses,m¹ and m² at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m² : m¹

• A. 2 : 1
• B. 3 : 3
• C. 2 : 3
• D. 1 : 2

What volume of alcohol will have same mass as 4.2m^-3 of petrol? Density of alcohol = 8.4 x 10² kgm^-3, density of petrol =7.2x10² kgm^-3

• A. 0.8m3
• B. 1.4m3
• C. 3.6m3
• D. 49.m3