Physics Past Questions and Answers

The mass of a proton is approximately equal to that of

A An \(\alpha\)-particle
B A \(\beta\)-particle
C \(\gamma\)-ray
D An electron
E A neutron

Question 182:

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

A 30cm
B 25cm
C 20cm
D 15cm
E 10cm

Question 183:

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

A Is opaque
B Has high density
C Has regular expansion
D Has a high thermal conductivity
E Can wet glass

Question 184:

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

A 1.12m
B 2.14cm
C 2.52cm
D 2.80cm
E 2.24cm

Question 185:

Which of the following is NOT directly associated with direct current (DC)?

A A dry cell
B A moving coil galvanometer
C A transformer
D A lead- acid accumulator
E A commutator