What is the effective capacitance in the circuit?

• A. 2\(\mu F\)
• B. 6\(\mu F\)
• C. 18\(\mu F\)
• D. 216\(\mu F\)

Which of the following practices will lead to losses in electrical power transmission?

• A. using transmission cables of large diameter
• B. transmitting at high voltage and low current
• C. transmitting at relatively low voltage and high current
• D. using a set-up transformer at the production end

A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine

• A. increased the surface tension of the water
• B. reduces the density of the water
• C. reduces the surface tension of the water
• D. reduces the upthrust on the needle

(a) Define Young's modulus.

(b) State the physical quantities one has to measure in order to determine the Young's modulus of a wire.

A conductor of length 1m moves with a velocity of 50ms^-1 at an angle of 30^o to the direction of a uniform magnetic field of flux density 1.5Wbm^-2. What is the e.m.f induced in the conductor?

• A. 37.5V
• B. 50.5V
• C. 75.0V
• D. 80.5V

A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V lf linear momentum is conserved, which of the following expressions correctly represents V?

• A. M1 U/M1 + M2
• B. M2 U/M1 + M2
• C. M1 + M2/M1 U
• D. M1 - M2/M1 U

(a) Define:(i) the coulomb; (ii) resistance.

(b) State the three effects of an electric current.

(c) State the standard international colour convention for the insulating material covering the following electrical wires in a three-pin plug: (i) live; (ii) neutral; (iii) earth.

(d)

A water melon of mass 5.0 kg is suspended on a uniform rod of mass 4.0 kg and 4.0 in long as illustrated in the diagram below. If the rod is in equilibrium by the action of the force between the charges +q and -q, calculate the:

(i) anti-clockwise moment;

(ii) value of q. [ g = 10 ms\(^{-2}\)]

If the velocity ratio of a machine is 5. What is its ratio of x and y?

• A. 2 : 5
• B. 1 : 5
• C. 5 : 1
• D. 3 : 1

In alternating current circuit at resonance, the angel of lead or lag is

• A) π°
• B) π/2°
• C) π/3°
• D) 0°

Surface waves travelling in deep water at 15ms^-1 are incident at a shallow water boundary. If the angles of incidence and refraction are 45^o and 30^o respectively. Calculate the speed of the waves in shallow water

• A. 8.1ms^-1
• B. 10.0ms^-1
• C. 10.6ms^-1
• D. 22.5ms^-1