## Thermal Properties of Matter Questions and Answers Part-2

1. The temperature on Celsius scale is 25°C. What is the corresponding temperature on the Fahrenheit scale
a) 40°F
b) 77°F
c) 50°F
d) 45°F

Explanation: 77°F

2. One quality of a thermometer is that its heat capacity should be small. If P is a mercury thermometer, Q is a resistance thermometer and R thermocouple type then
a) P is best, R worst
b) R is best, P worst
c) R is best, Q worst
d) P is best, Q worst

Explanation: R is best, Q worst

3.Two thermometers are used to record the temperature of a room. If the bulb of one is wrapped in wet hanky
a) The temperature recorded by both will be same
b) The temperature recorded by wet-bulb thermometer will be greater than that recorded by the other
c) The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other
d) None of the above

Explanation: The temperature recorded by dry-bulb thermometer will be greater than that recorded by the other

4.The temperature of a body on Kelvin scale is found to be x K. When it is measured by Fahrenheit thermometer, it is found to be x°F, then the value of x is
a) 40
b) 313
c) 574.25
d) 301.25

Explanation: 574.25

5.A centigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by the Centigrade thermometer
a) 30°
b) 40°
c) 60°
d) 80°

Explanation: 60°

6. At what temperature the centigrade (Celsius) and Fahrenheit, readings are the same
a) – 40°
b) + 40°
c) 36.6°
d) – 37°

Explanation: – 40°

7. Standardisation of thermometers is obtained with
a) Jolly’s thermometer
b) Platinum resistance thermometer
c) Thermocouple thermometer
d) Gas thermometer

Explanation: Gas thermometer

8. The gas thermometers are more sensitive than liquid thermometers because
a) Gases expand more than liquids
b) Gases are easily obtained
c) Gases are much lighter
d) Gases do not easily change their states

Explanation: Gases expand more than liquids

9. Mercury thermometers can be used to measure temperatures upto
a) 100°C
b) 212°C
c) 360°C
d) 500°C