Class 7 Heat CBSE Questions & Answers

Class 7 · Heat

This is Science Class 7 Heat CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Laboratory thermometer can not be used to measure our body temperature because
  • A
    It is quite larger in size
  • B
    Mercury is absent in it
  • C
    It do not gives accurate temperature
  • D
    Mercury levels falls as removed from body
    Correct
2
Which of the following the best conductor of heat?
  • A
    Copper
    Correct
  • B
    Magnesium
  • C
    Aluminium
  • D
    Iron
3
Vacuum is created between two layers of thermos flask because
  • A
    Vacuum is bad conductor of heat
    Correct
  • B
    Vacuum is good conductor of heat
  • C
    Vacuum prevents the air
  • D
    Vacuum pass heat easily
4
Laboratory thermometer differ from clinical thermometer in
  • A
    Having kink
  • B
    Larger in size
  • C
    Having no kink
    Correct
  • D
    Mercury is absent
5
Glass is good conductor of light but bad conductor of
  • A
    Heat
    Correct
  • B
    Temperature
  • C
    Pressure
  • D
    Force
6
During conduction, heat is transferred by
  • A
    Molecules in contact
    Correct
  • B
    Through gap between molecules
  • C
    Through inter molecular space
  • D
    Through air
7
Light coloured clothes are preferred in summer because
  • A
    It absorbs the light and heat
  • B
    It is lighter and soft
  • C
    It reflect the light and heat
    Correct
  • D
    It looks beautiful
8
Metals are good conductor of heat because
  • A
    Particles are smaller in size
  • B
    Particles are larger in size
  • C
    Particles are away from each other
  • D
    Particles are very close to each other
    Correct
9
Which of the following group contain only conductors?
  • A
    Copper, Cloths, Aluminium and Silver
  • B
    Copper, Aluminium, Silver and Mercury
    Correct
  • C
    Wood, Copper, Aluminium and Silver
  • D
    Aluminium, Silver and Mercury and paper
10
Mercury is used in thermometer because
  • A
    It expand uniformly
    Correct
  • B
    It is expensive
  • C
    It is very less reactive
  • D
    It is bad conductor of heat
11
Heat can
  • A
    Not change the state of matter
  • B
    Change the number of molecules
  • C
    Increase or decrease the temperature
    Correct
  • D
    Decrease the size
12
Substance that do not conduct heat are called
  • A
    Semi conductors
  • B
    Super conductors
  • C
    Insulators
    Correct
  • D
    Conductors
13
Coastal regions remain cool during the day due to
  • A
    Land breeze
  • B
    Sea breeze
    Correct
  • C
    Sea water
  • D
    Salty water of sea
14
Heating of water takes place due to
  • A
    Convection
    Correct
  • B
    Conduction
  • C
    Absorption
  • D
    Radiation
15
In chimney, smoke moves in upward direction because
  • A
    Cold air is lighter than warm air
  • B
    Warm air is lighter than cold air
    Correct
  • C
    Smoke have dust particles
  • D
    Smoke contain carbon dioxide gas