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Science MCQ

T2 CH4 Air · Tamil Nadu Board STD 6 (Tamil - English Medium). 10 questions.

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10 questions · timed · auto-graded

MCQ 11 Mark
$.......$ and $.......$ are the two gases, which when taken together, make up about $99$ percentage of air.
  1. Nitrogen
  2. carbon$-$di$-$oxide
  3. Noble gases
  4. Oxygen
  • A
    $I$ and $II$
  • B
    $I$ and $III$
  • C
    $II$ and $IV$
  • ✓
    $I$ and $IV$
Answer
Correct option: D.
$I$ and $IV$
$I$ and $IV$ are the two gases, which when taken together, make up about 99 percentage of air.
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MCQ 21 Mark
Nitrogen is used in the food packaging industry because it _____.
  • A
    provides colour to the food
  • B
    provides oxygen to the food
  • C
    adds proteins and minerals to the food
  • ✓
    keeps the food fresh
Answer
Correct option: D.
keeps the food fresh
Nitrogen is used in the food packaging industry because it keeps the food fresh.
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MCQ 31 Mark
The constituent of air that supports combustion is _____.
  • A
    Nitrogen
  • B
    water vapour
  • ✓
    Oxygen
  • D
    water vapour
Answer
Correct option: C.
Oxygen
The constituent of air that supports combustion is Oxygen.
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MCQ 41 Mark
Gas exchange takes place in plants using _____.
  • ✓
    Stomata
  • B
    Chlorophyll
  • C
    Leaves
  • D
    Flowers
Answer
Correct option: A.
Stomata
Gas exchange takes place in plants using stomata.
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MCQ 51 Mark
______ is the percentage of nitrogen in air.
  • ✓
    $78 \%$
  • B
    $21 \%$
  • C
    $0.03 \%$
  • D
    $1 \%$
Answer
Correct option: A.
$78 \%$
$78 \%$ is the percentage of nitrogen in air.
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MCQ 61 Mark
Which is used in refrigerating meat and fish?
  • A
    Liquid Ammonia
  • B
    Liquid Nitrogen
  • ✓
    Solid CO2
  • D
    Helium
Answer
Correct option: C.
Solid CO2
solid CO2
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MCQ 71 Mark
_______ was able to identify highly reactive gas called oxygen.
  • A
    Lavoisier
  • B
    Ingenhousz
  • C
    Rutherford
  • ✓
    Joseph Priestley
Answer
Correct option: D.
Joseph Priestley
Joseph Priestley
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MCQ 81 Mark
A process without emitting flame is called as …………
  • ✓
    Combustion
  • B
    Burning
  • C
    Cherring
  • D
    Melting
Answer
Correct option: A.
Combustion
Combustion
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MCQ 91 Mark
_______ is responsible for making clouds.
  • A
    Hydrogen
  • B
    Oxygen
  • ✓
    Water vapour
  • D
    Carbon-di-oxide
Answer
Correct option: C.
Water vapour
Water vapour
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MCQ 101 Mark
A layer consisted of water vapour which is responsible for making clouds is.
  • A
    Stratosphere
  • B
    Mesosphere
  • ✓
    Troposphere
  • D
    Exosphere
Answer
Correct option: C.
Troposphere
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