Physics Past Questions and Answers

A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?

A 6.50m
B 6.25m
C 6.00m
D 5.75m
E 5.50m

Question 2:

To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is ____________

A \(\frac{1}{2}\)v
B Pv
C \(\frac{p}{v}\)
D Pv²
E \(\frac{p}{v^2}\)

Question 3:

An electric iron rated 250 V has a coil of resistance 125Ω. What is the cost of using it for I hour at 10k per kWh?

A 1.25k
B 2.50k
C 5.00k
D 10.00k
E 20.00k

Question 4:

The image formed by a converging lens of focal length is of a distance of 2f from the lens. Calculate the lateral magnification produced

A 0.5
B 1
C 1.5
D 2
E 3

Question 5:

If the first position of resonance in a resonance tube is 18.0cm from the open end, the distance from the open end to the next position of resonance will be ____________

A 24.0cm
B 27.0cm
C 36.0cm
D 45.0cm
E 54.0cm