Physics Past Questions and Answers

A string of length 5cm is extended by 0.04m when a load of 0.8kg is suspended at the end. How far will it extend if a force of 16N is applied? [g = 10ms\(^{-2}\)]

A 0.04m
B 0.12m
C 0.01m
D 0.08m

Question 1977:

How can energy loss be minimized through Eddy-current?

A By using high resistance wire
B By using insulated soft iron wires
C By using low resistance wires
D Bu using turns of wires

Question 1978:

From the diagram above, calculate the energy stored in the capacitor

A 4.0 x 10\(^{-2}\)J
B 4.0 x 10\(^{-4}\)J
C 8.0 x 10\(^{-4}\)J
D 8.0 x 10\(^{-2}\)J

Question 1979:

A constant force of 5N acts for a 5 seconds on a mass of 5kg initially at rest. Calculate the final momentum

A 125kgmsâˆ’1
B 25kgms−1
C 15kgmsâˆ’1
D 0kgmsâˆ’1

Question 1980:

I. Refraction II. Interference III. Diffraction Which of the above properties are common to all waves?

A II and III only
B I, II and III
C I and II only
D I and III only