In measuring high frequency a.c, the instrument used is the

• A) d.c ammeter
• B) moving coil ammeter
• C) moving iron ammeter
• D) hot wire ammeter

The impulse of a force is deduced from Newton's second law as

• A. F = ma
• B. F = m( \(\frac{v−u}{t}\))
• C. F = mg
• D. F = mv - mu

A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?

• A. west
• B. east
• C. north-west
• D. north-east

State three different materials that can be used to demonstrate Brownian motion.

A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum

• A. 4.0 m
• B. 3.0 m
• C. 2.0 m
• D. 1.5 m

The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate the focal length of the mirror

• A. 3.75cm
• B. 6.60cm
• C. 10.00cm
• D. -15.00cm

Which of the following actions will not increase the sensitivity of a moving coil galvanometer?

• A. using a strong temporary magnet
• B. increasing the area and number of turns of the coil
• C. using a week hair spring
• D. using a light pointer

Electric motor primarily converts

• A. electrical energy into chemical energy
• B. electrical energy into heat energy
• C. kinetic energy into potential energy
• D. electrical energy into mechanical energy

The pressure exerted by a given mass of gas in a container

• A. decreases if the container is heated
• B. increases if the molecules of the gas move faster
• C. increases if the container is doubled
• D. decreases as the kinetic energy of the gas molecules inceases

The dimension of electromotive force are

• A) ML²T^-3I^-1
• B) ML²T^-3I^-2
• C) M²LT^-2I^-1
• D) M²L²T^-1I^-1