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PHYSICS MCQ

Heat and Energy · ICSE STD 9 (ICSE - English Medium). 15 questions.

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MCQ

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15 questions · timed · auto-graded

MCQ 11 Mark
The global warming has resulted in :
  • A
    the increase in yield of crops
  • B
    the decrease in sea levels
  • C
    the decrease in human deaths
  • ✓
    the increase in sea levels
Answer
Correct option: D.
the increase in sea levels
The global warming has resulted in : the increase in sea levels .
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MCQ 21 Mark
Without green house effect, the average temperature of Earth's surface would have been :
  • ✓
    $-18^\circ C$
  • B
    $33^\circ C$
  • C
    $0^\circ C$
  • D
    $15^\circ C$
Answer
Correct option: A.
$-18^\circ C$
Without green house effect, the average temperature of Earth's surface would have been $: -18^\circ C$
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MCQ 31 Mark
The increase of carbon dioxide gas in atmosphere will cause
  • A
    Decrease in temperature
  • ✓
    Increase in temperature
  • C
    No change in temperature
  • D
    increase in humidity.
Answer
Correct option: B.
Increase in temperature
The increase of carbon dioxide gas in atmosphere will cause Increase in temperature
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MCQ 71 Mark
The place of human being in food chain in an ecosystem is as
  • A
    Producer
  • ✓
    Consumer
  • C
    Decomposer
  • D
    Both $(a)$ and $(b)$
Answer
Correct option: B.
Consumer
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MCQ 81 Mark
Energy enters in a food chain through
  • A
    Primary consumers
  • B
    Secondary consumers
  • C
    Tertiary consumers
  • ✓
    Producers
Answer
Correct option: D.
Producers
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MCQ 101 Mark
Food chain begins with
  • A
    Respiration
  • ✓
    Photosynthesis
  • C
    Decomposition
  • D
    Decay
Answer
Correct option: B.
Photosynthesis
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MCQ 111 Mark
Density of water is maximum at :
  • A
    $0^\circ C$
  • B
    $100^\circ C$
  • ✓
    $4^\circ C$
  • D
    $15^\circ C$
Answer
Correct option: C.
$4^\circ C$
Water shows anomalous behavior between $0 ^\circ C$ and $4 ^\circ C.$ It has lowest volume at $4 ^\circ C.$ Hence, its density will be maximum at $4 ^\circ C.$
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MCQ 121 Mark
Water is cooled from $4 ^\circ C$ to $0 ^\circ C.$ It will :
  • A
    contract
  • ✓
    expand
  • C
    first contract, then expand
  • D
    first expand, then contract
Answer
Correct option: B.
expand
Water shows anomalous behavior between $0 ^\circ C$ and $4 ^\circ C.$ Hence, when it is cooled it expands.
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MCQ 131 Mark
$S.I.$ unit of temperature is :
  • A
    Cal
  • B
    Joule
  • C
    Celsius
  • ✓
    kelvin
Answer
Correct option: D.
kelvin
$S.I.$ unit of temperature is : kelvin $(K)$
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MCQ 141 Mark
$1\ J$ equals to :
  • ✓
    $0.24$ cal
  • B
    $4.18$ cal
  • C
    $1$ cal
  • D
    $1$ kcal
Answer
Correct option: A.
$0.24$ cal
$1\ J$ equals to $: 0.24$ cal
$1$ calorie $= 4.186\ J$

Therefore,

$1\ J = 1/4.186 = 0.24$ cal
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