Class 7 General Science, Chapter # 8, MCQs with answers

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1. The movement of molecule in an object produces _____

• Thermal energy
• Kinetic energy
• Convection 
• Conduction 

2. The faster the molecule are moving inside an object, the ____ the object will be.

• cooler
• hotter 
• solid
• liquid

3. Thermal energy is the energy that comes from ____

• Heat
• Sun  
• Moon 
• Petrol 

4. Thermal energy moves from ____

• Cooler objects to hotter
• Hotter objects to cooler
• Both of them
• None of these

5. Thermal energy transfer or moves between objects in ____ different ways:

• 2
• 4 
• 6
• 3

6. ____ occurs when thermal energy is transferred between two objects that are touching each other.

• Conduction 
• Convection 
• Radiation  
• Kinetic energy 

7. Some material allow heat to conduct through them easily are called:

• Convection
• Good heat conductor 
• Radiation  
• Kinetic energy 

8. Some material do not  allow heat to flow easily are called:

• Convection
• Good heat conductor 
• Bad heat conductor 
• Kinetic energy

9.  Stone is a better conductor of heat than a

• Carpet   
• plastic 
• Both of these
• None of these

10. Copper conducts heat ___ times better than iron.

• 5  
• 7 
• 10 
• 13 

11. ____ occurs only in liquid and gases.

• Conduction 
• Convection 
• Radiation  
• Kinetic energy 

12. Convection requires particles to be free to move, so it cannot take place in:

• solid
• liquid
• gas
• None of these   

13.  When a liquid is heated, the molecules at the ____ move with stronger vibrations.

• top
• Between   
• bottom 
• All liquid  

14. Convection currents are used to ____ our homes in daily life.

• decorate 
• ventilate
• clean
• wet 

15. Coastal breeze is also produced by ____

• energy
• Conduction 
• Convection 
• Radiation  

16. During the day time, the sun shines equally on:

• Land
• Sea 
• Both of the above 
• None of these

17. Land heats up more quickly than the:

• Wood 
• Carpet 
• Plant  
• Sea 

18. There is a sea breeze during the:

• day
• night 
• Both of these
• None of these

19. At night the land cools more quickly than the:

• sun
• moon
• sea
• None of these

20. Land breeze blow at ____

• day
• night 
• Both of these
• None of these

21. A radiation in a room heats up the room by ____

• Convection not by conduction
• Convection not by radiation
• Radiation not by convection
• Radiation not by conduction

22. Birds take advantage of upward movement of air called:

• Thermal 
• Conduction   
• Convection  
• Radiation 

23. Riding ____ are great energy savers for birds when they can find them.

• Radiation  
• Conduction   
• Convection  
• Thermal  

24. Many large birds wait on the ground until ____ in the morning for the thermals to form.

• 8 o’ clock
• 9 o’ clock
• 10 o’ clock
• 11 o’ clock 

25. Sun heat reaches us through a mode of transfer called:

• Thermal 
• Conduction   
• Convection  
• Radiation

26. The heat and energy transfer from a hotter place to a colder place with or without having a material medium in between, is called:

• Thermal 
• Radiation   
• Convection  
• Conduction 

27. All bodies, whether cold or hot radiate ____

• Heat 
• Light  
• air 
• Ash    

28. A hotter body radiates ____ than an identical colder body.

• less
• few 
• more   
• electricity 

29. The solar heat energy reaching the earth each year is more than ____ times than the world’s energy needs.

• 5000
• 10000 
• 12000
• 15000 

30. Good absorber is a:

• Poor radiator
• Good radiator
• both
• None of these 

31. Poor absorber is a:

• Poor radiator
• Good radiator
• Both of them
• None of these  

32. White clothes are worn in hot climates because white is a good reflector and a:

• Poor absorber
• Good radiator
• Both of them 
• None of these 

33. Black or dark coloured clothes are worn in cold climates because dark colour is a poor reflector and a:

• Poor absorber
• Good absorber
• Both of them
• None of these 

34. A vacuum flask or a thermos flask is a type of flask that aims to stop:

• Conduction 
• Convection 
• Radiation 
• All of these

35. The heat in a metal rod flows by the process of:

• Radiation 
• Conduction 
• Convection 
• Magnetization 

36. Coastal breeze is produced by:

• Convection 
• Radiation 
• Conduction 
• Rain 

37. Heat transfer from a hotter place to a colder place by actual movement of the particles of the medium is known as

• Convection 
• Radiation 
• Conduction 
• Evaporation 

38. Convection occurs only in:

• Liquids and gases
• Solids and gases
• Liquids and solids
• Liquids and metals