MEDIUM
7th CBSE
IMPORTANT
Earn 100

Choose the correct statement:
(A) Boiling of a given substance takes place at all temperatures.
(B) Evaporation of a substance takes place at a constant temperature.
(C) Boiling takes place at every part of the liquid.
(D) Evaporation takes place only on the surface of liquid.

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Important Questions on Heat

HARD
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 22
Choose the correct statement:
(A) Solids undergo linear, arial and cubical expansions.
(B) Liquids and gases undergo cubical expansion.
MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 23
In solids generally, the heat is transferred by the process of _____.
MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 24
Which of the following statements is/are wrong?
MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 25
Which of the following is a poor conductor of heat?
HARD
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 26

The heating\ curve of a particular substance in solid state is as shown in the figure. Choose the correct alternative.

Question Image

If mass of the substance is 20 g, then the heat energy required to melt 1 g of the substance is _____ J.

MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 27

The heating\ curve of a particular substance in solid state is as shown in the figure. Choose the correct alternative.

Question Image

The change of state in the graph is represented by _____ part.

EASY
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 28
Arrange the following steps in a sequential order to explain the formation of convectional currents through ventilation.
(A) The cold air enters into the room through windows from high pressure to low pressure region.
(B) Hot air in the room is less denser and it raises up.
(C) The rooms are provided with ventilators at the top.
(D) Hot air passes out through the ventilators it creates low pressure region in the rooms.
MEDIUM
7th CBSE
IMPORTANT
Pearson IIT Foundation Physics>Chapter 3 - Heat>PRACTICE QUESTIONS (CLASSROOM WING)>Q 29
Arrange the following steps in sequential order to construct a celsius thermometer.
(A) Lower fixing point is marked by placing the bulb of the thermometer in pure melting ice.
(B) A thin capillary tube, covered with a thick glass stem and providing a funnel is taken.
(C) The distance between upper fixing point and lower fixing point is divided into 100 equal parts and calibrated.
(D) Upper fixing point is marked by placing the bulb of the thermometer in boiling water.. Arrange the following steps in sequential order to construct a celsius thermometer. of the thermometer in boiling water.
(E) While pouring the mercury in the tube, place the mercury bulb in hot water bath to remove air bubbles.
(F) Cut the funnel and seal that end.