Physics Past Questions and Answers

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms^-2, the power expended is

A 100W
B 200W
C 250W
D 400W
E 500W

Question 17:

Which of the following arrangements in the sequence shown can be used to obtain a pure spectrum of white light?

A Source, slit, converging lens, prism, converging lens, screen.
B Source, slit, diverging lens, prism, diverging lens, screen.
C Source, converging lens, prism, diverging lens, screen.
D Source, slit, prism, diverging lens, converging lens, screen.
E Source, slit, prism, diverging lens, sreen.

Question 18:

A milliameter with full scale deflection of 10mA has an internal resistance of 5 ohms. It would be converted to an ammeter with a full scale deflection of 1A by connecting a resistance of

A \(\frac{5}{99}\)ohms in series with it
B \(\frac{5}{99}\)ohms in parallel with it
C \(\frac{99}{5}\)ohms in series with it
D \(\frac{99}{5}\)ohms in parallel with it
E 2 ohms in series with it

Question 19:

The linear expansivity of brass is 2 x 10^-5^oC^-1. If the volume of a piece of brass is 10cm³ at 0^oC, what will be its volume at 100^oC?

A 10.02cm³
B 10.04cm³
C 10.06cm³
D 10.20cm³
E 102.00cm³

Question 20:

A 24V potential difference is applied across a parallel combination of four 6-ohms resistor, The current in each resistor is

A 1A
B 4A
C 16A
D 18A
E 36A