Physics Past Questions and Answers

An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is

A 7.2kg
B 33.2kg
C 43.2kg
D 53.2kg

Question 17:

The length of mercury thread when it is at 0°C, 100°C and at an unknown temperature \(\theta\) is 25mm, 225mm and 175mm respectively. The value of \(\theta\) is

A 85.0^oC
B 80.0^oC
C 75.0^oC
D 70.0^oC

Question 18:

Equal masses of copper and rubber are raised to the same temperature. After sometimes, the copper was observed to be at a lower temperature because

A The specific heat capacity of copper is lower than that of rubber
B Copper expands more than rubber
C The specific heat capacity of rubber is lower than that of copper
D Rubber expands more than copper

Question 19:

Before starting a journey, the tyre pressure of a car was 3 x 10⁵Nm^-2 at 27^oC. At the end of the journey, the pressure rose to 4 x 10⁵Nm^-2. Calculate the temperature of the tyre after the journey, assuming the volume is constant

A 400^oC
B 300^oC
C 273^oC
D 127^oC

Question 20:

What happens when a, certain quantity of pure ice is completely changed to water at 0oC?

A Latent heat is absorbed, the mass remains constant, and the volume decreases
B Latent heat is given out, the mass remains constant and the volume decreases
C Latent heat is given out, the mass increases and the volume remains constant
D Latent heat is absorbed, the mass decreases and the volume increases