Which of the following equations represents the distance x, travelled by a body moving on a straight road with a constant speed? [The other symbol have their usual meanings]

• A. x = Ut + \(\frac{1}{2}t^2\)
• B. x = Ut
• C. x = \(\frac{V^2 - U^2}{2a}\)
• D. x = -\(\frac{1}{2} at^2\)

A resistance thermometer has a resistance of 20\(\Omega\) at 0^oC and 85\(\Omega\) at 100^oC. If its resistance is 52\(\Omega\)in a medium, calculate the corresponding temperature

• A. 49.2^oC
• B. 60.6^oC
• C. 80.0^oC
• D. 84.7^oC

The circuit above consists of an a. c. voltage input, a diode, a resistor and a voltmeter.

(a) Identify the circuit.

(b) Draw the waveform for the output voltage.

Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10\(^{-11}\) Nm\(^2\) kg\(^2\)]

• A. 1.6 x 10\(^{-9}\)N
• B. 1.3 x 10\(^{3}\)N
• C. 2.3 x 10\(^{3}\)N
• D. 5.0x 10\(^{3}\)N

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe, the frequency of the note is

• A. 2v/t
• B. v/5t
• C. v/4t
• D. v/2t

A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]

• A. 0.23hp
• B. 0.40hp
• C. 4.00hp
• D. 4.40hp

In a compound microscope, the objective and the eye piece focal lengths are

• A. At infinity
• B. Long
• C. Short
• D. The same

Which of the following thermometers is used to measure the temperature of the human body?

• A. Thermocouple
• B. Alcohol-in-glass thermometer
• C. Gas thermometer
• D. Platinum resistance thermometer

(a) (i) Define force and state its S.I unit.

(ii) List the two types of solid friction.

(b) A car travelling at a constant speed of 30 ms-1 for 20 s was suddenly decelerated when the driver sighted a pot-hole. It took the driver 6 s to get to the pot-hole with a reduced speed of 18 ms-1. He maintained the steady speed for another 10 s to cross the pot-hole. The brakes were then applied and the car came to rest 5 s later.

(i) Draw the velocity-time graph for the journey.

(ii) Calculate the deceleration during the last 5 s of the journey.

(iii) Calculate the total distance covered.

A ball of mass 0.15kg is kicked against a rigid vertical wall with a horizontal velocity of 50ms-1. If it rebounced with a horizontal velocity of 30ms-1, Calculate the impulse of the ball on the ball · ·

• A. 3.0Ns
• B. 4.5Ns
• C. 7.5Ns
• D. 12.0Ns