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PHYSICS MCQ

Heat Transfer · ICSE STD 8 (ICSE - English Medium). 9 questions.

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9 questions · timed · auto-graded

MCQ 11 Mark
The correct statement is
  • A
    Iron rims are cooled before they are placed on the cart wheels.
  • B
    A glass stopper gets tighten on warming the neck of the bottle.
  • C
    Telephone wires sag in winter but become tight in summer.
  • ✓
    A little space is left between two rails on a railway track.
Answer
Correct option: D.
A little space is left between two rails on a railway track.
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MCQ 21 Mark
The increase in length of a metal rod depends on
  • A
    the initial length of the rod only
  • B
    the rise in temperature only
  • C
    the material of rod only
  • ✓
    all the above three factors.
Answer
Correct option: D.
all the above three factors.
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MCQ 31 Mark
A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then.
  • A
    alcohol contracts, but water expands
  • B
    water contracts, but alcohol expands
  • C
    water expands more than alcohol
  • ✓
    alcohol expands more than water.
Answer
Correct option: D.
alcohol expands more than water.
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MCQ 41 Mark
Two rods $A$ and $B$ of the same metal, same length, but one solid and the other hollow, are heated to the same rise in temperature.
  • A
    the solid  rod $ A$ expands more than the hollow rod $ B$
  • B
    the hollow rod $B$ expands more than the solid rod $A$
  • C
    the hollow rod $B$ contracts, but the solid rod $A$ expands
  • ✓
    both the rods $A$ and $B$ expand the same.
Answer
Correct option: D.
both the rods $A$ and $B$ expand the same.
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MCQ 51 Mark
Two rods $A$ and $B$ of the same metal, but of length $1\  m$ and $2\  m$ respectively, are heated from $0^\circ C$ to $100^\circ C.$ Then
  • A
    both the rods $A$ and $B$ elongate the same
  • B
    the rod $A$ elongates more than the rod $B$
  • ✓
    the rod $B$ elongates more than the rod $ A$
  • D
    the rod $A$ elongates, but the rod $B$ contracts.
Answer
Correct option: C.
the rod $B$ elongates more than the rod $ A$
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MCQ 61 Mark
The boiling point of a liquid is increased by
  • A
    increasing the volume of liquid
  • ✓
    increasing the pressure, on liquid
  • C
    adding ice to the liquid
  • D
    decreasing pressure on liquid.
Answer
Correct option: B.
increasing the pressure, on liquid
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MCQ 71 Mark
During boiling or vaporization
  • ✓
    all molecules take part
  • B
    temperature rises
  • C
    no heat is absorbed
  • D
    the average kinetic energy of molecules increases.
Answer
Correct option: A.
all molecules take part
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MCQ 81 Mark
The rate of evaporation of a liquid increases when:
  • A
    temperature of liquid falls
  • B
    liquid is poured in a vessel of less surface area
  • ✓
    air is blown above the surface of liquid
  • D
    humidity increases
Answer
Correct option: C.
air is blown above the surface of liquid
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MCQ 91 Mark
In evaporation
  • A
    all molecules of liquid begin to escape out
  • ✓
    only the molecules at the surface escape out
  • C
    the temperature of liquid rises by absorbing heat from surroundings.
  • D
    the molecules get attracted within the liquid.
Answer
Correct option: B.
only the molecules at the surface escape out
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MCQ - PHYSICS STD 8 Questions - Vidyadip