Samacheer Kalvi Class 9 Science Physics Heat Questions - 1

Question: 1

Each molecular exerts a force of attraction on other molecules, thus they possess

(A) Kinetic energy

(B) Potential energy

(C) Sound energy

(D) Internal energy

Ans: B

Potential energy

Question: 2

Which of the following is a bad conductor of heat?

(A) Air

(B) Silver

(C) Mercury

(D) Aluminium

Ans: A

Air

Question: 3

The temperature at which the Celsius and Fahrenheit scales coincide is

(A) 38

(B) 40

(C) -40

(D) 45

Ans: C

-40

Question: 4

The quantity of heat required to convert 100 g of ice at 0°C into Water at 25°C is

(A) 4200 J

(B) 33600 J

(C) 10500 J

(D) 44100 J

Ans: D

44100 J

Question: 5

SI unit of specific heat capacity

(A) Jkg-1K-1

(B) JK-1

(C) JKgK-1

(D) JKg-1 K

Ans: A

Jkg-1K-1

Question: 6

Calorie is the unit of

(A) Food

(B) Temperature

(C) Work

(D) Heat

Ans: D

Heat

Question: 7

A device in which the loss of heat due to conduction, convection and radiation is minimized is

(B) Thermometer

(C) Solar cooker

(D) Solar cell

Ans: A

Question: 8

Boiling point of water in Fahrenheit scale is

(A) 195° F

(B) 200°F

(C) 212°F

(D) 253°F

Ans: C

212°F

Question: 9

The heat energy released/absorbed by a substance during the change of its physical state is

(A) Boiling heat

(B) Specific heat

(C) Latent heat

(D) Freezing heat

Ans: A

Boiling heat

Question: 10

At the temperature of absolute zero,

(A) All liquids are converted into solid

(B) All gases convert into solid

(C) All things are gas

(D) K.E. of molecules becomes zero

Ans: D

K.E. of molecules becomes zero