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
Substance that do not conduct heat is called
  • A
    Radiator
  • B
    Conductor
  • C
    Insulator
    Correct
  • D
    Semiconductor
2
Which of the following is the fastest mode of heat transfer in solid?
  • A
    Convection
  • B
    Radiation
  • C
    All of these
  • D
    Conduction
    Correct
3
Freezing point of water at sea level is ----- 0F
  • A
    32.0
    Correct
  • B
    0
  • C
    34
  • D
    22
4
Select the substance in which heat transfer takes place through conduction.
  • A
    Vacuum
  • B
    Iron
    Correct
  • C
    Water
  • D
    Air
5
The temperature at which substance start changing from liquid to gas is called
  • A
    Boiling point
    Correct
  • B
    Condensation point
  • C
    Freezing point
  • D
    Melting point
6
Kink is present in
  • A
    Clinical thermometer
    Correct
  • B
    Laboratory thermometer
  • C
    Gaseous thermometer
  • D
    All thermometers
7
Thermos flask
  • A
    Is used to cool the liquid
  • B
    Increase or decrease the temperature
  • C
    Is used to heat liquid
  • D
    Maintain the temperature hot or cold
    Correct
8
S.I. unit of heat is
  • A
    Joule
    Correct
  • B
    Calories
  • C
    Newton
  • D
    Watt
9
Which one is the fastest mode of heat transfer?
  • A
    All of these conduct at same rate
  • B
    Radiation
  • C
    Convection
  • D
    Conduction
    Correct
10
Metal used in bulb of clinical thermometer is
  • A
    Sodium
  • B
    Mercury
    Correct
  • C
    Zinc
  • D
    Silicon
11
Mode of transfer of heat in which no medium is required is
  • A
    Radiation
    Correct
  • B
    Convection
  • C
    All of these
  • D
    Conduction
12
Range of clinical thermometer is
  • A
    35\(^0{\text{C}}\) to 52\(^0{\text{C}}\)
  • B
    25\(^0{\text{C}}\) to 62\(^0{\text{C}}\)
  • C
    38\(^0{\text{C}}\) to 42\(^0{\text{C}}\)
  • D
    35\(^0{\text{C}}\) to 42\(^0{\text{C}}\)
    Correct
13
We know the temperature of our body using thermometer by
  • A
    Air gap in thermometer
  • B
    Black thread of mercury
  • C
    Water level in thermometer
  • D
    Shining thread of mercury
    Correct
14
0\(^0{\text{C}}\) is equal to
  • A
    273 K
    Correct
  • B
    283 K
  • C
    383 K
  • D
    173 K
15
Which of the following metals have highest melting point?
  • A
    Copper
  • B
    Gold
    Correct
  • C
    Mercury
  • D
    Silver