Class 7 General Science, Chapter # 8, MCQs with answers
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- The movement of molecule in an object produces _____
- Thermal energy
- Kinetic energy
- Convection
- Conduction
- The faster the molecule are moving inside an object, the ____ the object will be.
- cooler
- hotter
- solid
- liquid
- Thermal energy is the energy that comes from ____
- Heat
- Sun
- Moon
- Petrol
- Thermal energy moves from ____
- Cooler objects to hotter
- Hotter objects to cooler
- Both of them
- None of these
- Thermal energy transfer or moves between objects in ____ different ways:
- 2
- 4
- 6
- 3
- ____ occurs when thermal energy is transferred between two objects that are touching each other.
- Conduction
- Convection
- Radiation
- Kinetic energy
- Some material allow heat to conduct through them easily are called:
- Convection
- Good heat conductor
- Radiation
- Kinetic energy
- Some material do not allow heat to flow easily are called:
- Convection
- Good heat conductor
- Bad heat conductor
- Kinetic energy
- Stone is a better conductor of heat than a
- Carpet
- plastic
- Both of these
- None of these
- Copper conducts heat ___ times better than iron.
- 5
- 7
- 10
- 13
- ____ occurs only in liquid and gases.
- Conduction
- Convection
- Radiation
- Kinetic energy
- Convection requires particles to be free to move, so it cannot take place in:
- solid
- liquid
- gas
- None of these
- When a liquid is heated, the molecules at the ____ move with stronger vibrations.
- top
- Between
- bottom
- All liquid
- Convection currents are used to ____ our homes in daily life.
- decorate
- ventilate
- clean
- wet
- Coastal breeze is also produced by ____
- energy
- Conduction
- Convection
- Radiation
- During the day time, the sun shines equally on:
- Land
- Sea
- Both of the above
- None of these
- Land heats up more quickly than the:
- Wood
- Carpet
- Plant
- Sea
- There is a sea breeze during the:
- day
- night
- Both of these
- None of these
- At night the land cools more quickly than the:
- sun
- moon
- sea
- None of these
- Land breeze blow at ____
- day
- night
- Both of these
- None of these
- 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
- Birds take advantage of upward movement of air called:
- Thermal
- Conduction
- Convection
- Radiation
- Riding ____ are great energy savers for birds when they can find them.
- Radiation
- Conduction
- Convection
- Thermal
- 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
- Sun heat reaches us through a mode of transfer called:
- Thermal
- Conduction
- Convection
- Radiation
- 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
- All bodies, whether cold or hot radiate ____
- Heat
- Light
- air
- Ash
- A hotter body radiates ____ than an identical colder body.
- less
- few
- more
- electricity
- The solar heat energy reaching the earth each year is more than ____ times than the world’s energy needs.
- 5000
- 10000
- 12000
- 15000
- Good absorber is a:
- Poor radiator
- Good radiator
- both
- None of these
- Poor absorber is a:
- Poor radiator
- Good radiator
- Both of them
- None of these
- 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
- 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
- A vacuum flask or a thermos flask is a type of flask that aims to stop:
- Conduction
- Convection
- Radiation
- All of these
- The heat in a metal rod flows by the process of:
- Radiation
- Conduction
- Convection
- Magnetization
- Coastal breeze is produced by:
- Convection
- Radiation
- Conduction
- Rain
- 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
- Convection occurs only in:
- Liquids and gases
- Solids and gases
- Liquids and solids
- Liquids and metals
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