Unit 8 Transmission of Heat | Class 7 General Science

Unit 8 Transmission of Heat | Class 7 General Science

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 
  1. The faster the molecule are moving inside an object, the ____ the object will be.
  • cooler
  • hotter 
  • solid
  • liquid
  1. Thermal energy is the energy that comes from ____
  • Heat
  • Sun  
  • Moon 
  • Petrol 
  1. Thermal energy moves from ____
  • Cooler objects to hotter
  • Hotter objects to cooler
  • Both of them
  • None of these
  1. Thermal energy transfer or moves between objects in ____ different ways:
  • 2
  • 6
  • 3
  1. ____ occurs when thermal energy is transferred between two objects that are touching each other.
  • Conduction 
  • Convection 
  • Radiation  
  • Kinetic energy 
  1. Some material allow heat to conduct through them easily are called:
  • Convection
  • Good heat conductor 
  • Radiation  
  • Kinetic energy 
  1. Some material do not  allow heat to flow easily are called:
  • Convection
  • Good heat conductor 
  • Bad heat conductor 
  • Kinetic energy
  1.  Stone is a better conductor of heat than a
  • Carpet   
  • plastic 
  • Both of these
  • None of these
  1. Copper conducts heat ___ times better than iron.
  • 5  
  • 10 
  • 13 
  1. ____ occurs only in liquid and gases.
  • Conduction 
  • Convection 
  • Radiation  
  • Kinetic energy 
  1. Convection requires particles to be free to move, so it cannot take place in:
  • solid
  • liquid
  • gas
  • None of these   
  1.  When a liquid is heated, the molecules at the ____ move with stronger vibrations.
  • top
  • Between   
  • bottom 
  • All liquid  
  1. Convection currents are used to ____ our homes in daily life.
  • decorate 
  • ventilate
  • clean
  • wet 
  1. Coastal breeze is also produced by ____
  • energy
  • Conduction 
  • Convection 
  • Radiation  
  1. During the day time, the sun shines equally on:
  • Land
  • Sea 
  • Both of the above 
  • None of these
  1. Land heats up more quickly than the:
  • Wood 
  • Carpet 
  • Plant  
  • Sea 
  1. There is a sea breeze during the:
  • day
  • night 
  • Both of these
  • None of these
  1. At night the land cools more quickly than the:
  • sun
  • moon
  • sea
  • None of these
  1. Land breeze blow at ____
  • day
  • night 
  • Both of these
  • None of these
  1. 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
  1. Birds take advantage of upward movement of air called:
  • Thermal 
  • Conduction   
  • Convection  
  • Radiation 
  1. Riding ____ are great energy savers for birds when they can find them.
  • Radiation  
  • Conduction   
  • Convection  
  • Thermal  
  1. 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 
  1. Sun heat reaches us through a mode of transfer called:
  • Thermal 
  • Conduction   
  • Convection  
  • Radiation
  1. 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 
  1. All bodies, whether cold or hot radiate ____
  • Heat 
  • Light  
  • air 
  • Ash    
  1. A hotter body radiates ____ than an identical colder body.
  • less
  • few 
  • more   
  • electricity 
  1. The solar heat energy reaching the earth each year is more than ____ times than the world’s energy needs.
  • 5000
  • 10000 
  • 12000
  • 15000 
  1. Good absorber is a:
  • Poor radiator
  • Good radiator
  • both
  • None of these 
  1. Poor absorber is a:
  • Poor radiator
  • Good radiator
  • Both of them
  • None of these  
  1. 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 
  1. 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 
  1. A vacuum flask or a thermos flask is a type of flask that aims to stop:
  • Conduction 
  • Convection 
  • Radiation 
  • All of these
  1. The heat in a metal rod flows by the process of:
  • Radiation 
  • Conduction 
  • Convection 
  • Magnetization 
  1. Coastal breeze is produced by:
  • Convection 
  • Radiation 
  • Conduction 
  • Rain 
  1. 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 
  1. Convection occurs only in:
  • Liquids and gases
  • Solids and gases
  • Liquids and solids
  • Liquids and metals

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