MCQ Questions for Class 7 Science: Ch 4 Heat

MCQ Questions for Class 7 Science: Ch 4 Heat

1. Which of the following is a insulator
(a) Graphite
(b) Air
(c) Aluminium rod
(d) Copper rod
► (b) Air

2. Which of the following is the best conductor of heat?
(a) Water vapour
(b) Metals
(c) Alcohol
(d) Water
► (b) Metals

3. Heat of sun reaches to earth by
(a) Radiation
(b) Conduction
(c) Through air
(d) Convection
► (a) Radiation

4. During the night
(a) Sea water heats up
(b) Land heats up
(c) Land cools more quickly than the sea
(d) Sea cools quickly than the land
► (c) Land cools more quickly than the sea

5. Mercury is generally used in thermometer because it has a
(a) high fluidity                 
(b) high density
(c) high conductivity        
(d) high specific heat
► (c) high conductivity        

6. Which of the following devices is used for measurement of temperature of human body?
(a) Stethoscope
(b) Clinical thermometer
(c) Laboratory thermometer
(d) None of these
► (b) Clinical thermometer

7. Metals are ___________ conductor of heat.
(a) Some are good
(b) Some are poor conductor
(c) Poor
(d) Good
► (d) Good

8. Normal body temperature is
(a) 39°C
(b) 17°C
(c) 27°C
(d) 37°C
► (d) 37°C

9. Glass, plastic, wood are examples of
(a) Insulator
(b) Conductor
(c) Radiators
(d) Convectors
► (a) Insulator

10. In which mode of heat transfer does the transfer of heat occur as a wave?
(a) Conduction                 
(b) Convection
(c) Radiation      
(d) All of these
► (c) Radiation      

11. A wooden spoon is dipped in cup of ice-cream, its other end
(a) Does not become cold
(b) Become cold by radiation
(c) Become cold by convection
(d) Become cold by conduction
► (a) Does not become cold

12. Heat is a form
(a) Power
(b) Work
(c) Temperature
(d) Energy
► (d) Energy

13. 10°C is equal to
(a) 173 K
(b) 273 K
(c) 283 K
(d) 183 K
► (c) 283 K

14. On a Fahrenheit scale
(a) Boiling point of water is 212°F
(b) The temperature will be equal to that on the Celsius scale at −40°C
(c) The difference between the upper fixed point and the lower fixed point is divided into 180 equal parts
(d) All of the above
► (d) All of the above

15. Which type of cloth is preferred in summer?
(a) Silk clothes
(b) Cotton clothes
(c) Nylon clothes
(d) Polyester clothes
► (b) Cotton clothes

16. When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until them both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat
(a) gained by the hotter body will be equal to the heat lost by the colder body
(b) the heat gained by the hotter body will be less than the heat lost by the colder body
(c) the heat gained by the hotter body will be greater than the heat lost by the colder body
(d) the heat lost by the hotter body will be equal to the heat gained by the colder body.
► (d) the heat lost by the hotter body will be equal to the heat gained by the colder body.

17. Thermos flask keeps hot liquid hot and cold liquid cold by
(a) Cooling
(b) Using coolant
(c) Preventing heat loss
(d) Heating
► (c) Preventing heat loss

18. Method of heat transfer in steel rod is
(a) Conduction
(b) Convection
(c) Radiation
(d) All of these
► (a) Conduction

19. The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following?
(a) Celsius  
(b) Farenheit
(c) Both (a) and (b)          
(d) None of these
► (a) Celsius  

20. Process of change of state from gaseous state to liquid state is called
(a) freezing           
(b) sublimation
(c) boiling             
(d) condensation
► (d) condensation

21. In sea breeze
(a) cold air moves from sea towards land during day time
(b) hot air moves from sea towards land during day time
(c) cold air moves from land towards sea during day time
(d) None of the above is correct
► (a) cold air moves from sea towards land during day time

22. Expansion of a substance on heating depends on
(a) nature of the substance
(b) rise in temperature
(c) both A and B
(d) color of the substance
► (c) both A and B

23. Seema is in a hurry and wants her noodles to cool down faster. She should put it on a plate made of
(a) wood
(b) paper
(c) plastic
(d) metal
► (d) metal

24. Specific heat is
(a) the specific temperature at which the substance is in solid state.
(b) the heat needed to increase the temperature of 1 gallon of water by 1 degree Fahrenheit.
(c) the amount of heat conducted in 1 minute.
(d) the energy needed to increase the temperature of 1 gram of a substance by 1 degree Celsius.
► (d) the energy needed to increase the temperature of 1 gram of a substance by 1 degree Celsius.

25. The flow of heat by conduction is generally observed in case of
(a) solids
(b) liquids
(c) gases
(d) All of these
► (a) solids
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