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Science M C Q

Heat. · Tamil Nadu Board STD 8 (Tamil - English Medium). 17 questions.

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17 questions · timed · auto-graded

MCQ 11 Mark
When two objects are in thermal contact, the heat is transferred by ………………
  • A
    convection
  • B
    radiation
  • ✓
    conduction
  • D
    none
Answer
Correct option: C.
conduction
conduction
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MCQ 21 Mark
Substances which allow heat to pass through them are called …………….
  • ✓
    conductors
  • B
    insulators
  • C
    moderators
  • D
    none
Answer
Correct option: A.
conductors
conductors
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MCQ 31 Mark
Process of change of state from gaseous state to liquid state is called …………….
  • A
    freezing
  • ✓
    condensation
  • C
    sublimation
  • D
    boiling
Answer
Correct option: B.
condensation
condensation
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MCQ 41 Mark
Mud houses are cooler in summer and warmer in winter because –
  • A
    mud is a bad conductor of heat
  • B
    mud is a good conductor of heat
  • ✓
    mud is a super conductor of heat
  • D
    none
Answer
Correct option: C.
mud is a super conductor of heat
mud is a super conductor of heat
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MCQ 51 Mark
In conduction, heat flows from ………………
  • A
    hotter to hotter region
  • B
    colder to hotter region
  • ✓
    hotter to colder region
  • D
    colder to colder region
Answer
Correct option: C.
hotter to colder region
hotter to colder region
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MCQ 61 Mark
In solid substances, heat is transferred by $–$
  • A
    conduction
  • ✓
    radiation
  • C
    convection
  • D
    only $a$ and $b$
Answer
Correct option: B.
radiation
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MCQ 71 Mark
Convection of heat takes place in ……………
  • A
    liquids only
  • B
    gases only
  • C
    metals only
  • ✓
    liquids and gases
Answer
Correct option: D.
liquids and gases
liquids and gases
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MCQ 81 Mark
Which of the following is not a scale of temperature?
  • A
    Kelvin scale
  • B
    Celsius scale
  • ✓
    Richter scale
  • D
    Fahrenheit scale
Answer
Correct option: C.
Richter scale
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MCQ 91 Mark
The SI unit of heat energy is ………………
  • ✓
    joule
  • B
    calorie
  • C
    kilo calorie
  • D
    none of these
Answer
Correct option: A.
joule
joule
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MCQ 111 Mark
Which one of the following statements about thermal conductivity is correct? Give reason
  • A
    Steel > Wood > Water
  • B
    Steel > Water > Wood
  • C
    Water > Steel > Wood
  • D
    Water > Wood > Steel
Answer
Steel > Water > Wood
Reason:
Thermal conductivity is defined as the heat flow per unit time.
Steel has a higher thermal conductivity than water and wood.
[Thermal conductivity of steel = 50.2 w/mk
Thermal conductivity of water = 0.6 w/mk Thermal conductivity of wood = 0.12 w/mk]
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MCQ 121 Mark
Conduction is the way of heat transfer which takes place in a _____.
  • A
    solid
  • B
    liquid
  • C
    gas
  • D
    All of them
Answer
All of them
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MCQ 131 Mark
The process of converting a liquid into a solid is called ________.
  • A
    sublimation
  • B
    condensation
  • C
    freezing
  • D
    deposition
Answer
The process of converting a liquid into a solid is called freezing.
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MCQ 141 Mark
If you apply equal amount of heat to a solid, liquid, and gas individually, which of the following will have more expansion?
  • A
    Solid
  • B
    Liquid
  • C
    Gas
  • D
    All of them
Answer
Gas
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MCQ 151 Mark
Which of the following substances will absorb more heat energy?
  • A
    Solid
  • B
    Liquid
  • C
    Gas
  • D
    All the above
Answer
All the above
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MCQ 161 Mark
If you apply some heat energy to a substance, which of the following can take place in it?
  • A
    Expansion
  • B
    Increase in temperature
  • C
    Change of state
  • D
    All the above
Answer
All the above
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MCQ 171 Mark
Heat is a form of _______.
  • A
    electrical energy
  • B
    gravitational energy
  • C
    thermal energy
  • D
    None of these
Answer
Heat is a form of thermal energy.
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