Physics Past Questions and Answers

A plastic sphere floats in water with 50% of its volume submerged. if it floats in glycerine with 40% of its volume submerged,the density of the glycerine is?

A 1400 kgm^-3
B 1250 kgm^-3
C 500 kgm^-3
D 1000 kgm^-3

Question 12:

The thermometer whose reading is indicated by a change in colour of its thermometric property is the?

A Bi-metalic strip thermometer
B Thermocouple
C Platinium resistance thermometer
D Optical pyrometer

Question 13:

At 4°c, the volume of a fixed mass of water is?

A Constant
B Minimum
C Maximum
D Zero

Question 14:

An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg^-1 K^-1]

A 4.28 kg
B 42.86 kg
C 1.02 kg
D 7.14 kg

Question 15:

If the pressure of the vapour on top of an enclosed liquid is equal to the atmospheric pressure, what will be the temperature of the liquid enclosed?

A Room temperature
B Boiling point
C Freezing point
D Standard temperature