Question 4321:

• NECO 2000

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 4322:

• NECO 2000

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 4323:

• NECO 2000

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 4324:

• NECO 2000

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 4325:

• NECO 2000

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