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Science M.C.Q. [I MARKS]

Force and Pressure · Gujarat Board (GSEB) STD 8 (GSEB - English Medium). 19 questions.

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M.C.Q. [I MARKS]

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19 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Which of the following is not an example of the force of gravity?
  • A
    A leaf falling from a tree.
  • ✓
    A boy pushing a cart on a level plane.
  • C
    A diver jumping into a swimming pool.
  • D
    A stone falling from the top of a cliff.
Answer
Correct option: B.
A boy pushing a cart on a level plane.
Explanation:
A boy pushes a cart on a level of plane due to force.
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MCQ 21 Mark
Which of the following force is utilized in reducing air pollution by removing dust, soot and fly-ash particles from the smoke coming out of chimneys of factories?
  • A
    Magnetic force.
  • B
    Gravitational force.
  • ✓
    Electrostatic force.
  • D
    Frictional force.
Answer
Correct option: C.
Electrostatic force.
Explanation:
Charged particles gets removed by electrostatic force.
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MCQ 31 Mark
The atmospheric pressure is usually measured in the unit of:
  • A
    Newtons per square meter.
  • B
    Pascal.
  • C
    Cm of mercury.
  • ✓
    Mm of mercury.
Answer
Correct option: D.
Mm of mercury.
Explanation:
The level of mercury is measured in mm.
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MCQ 41 Mark
The magnitude of atmospheric pressure is equal to the pressure exerted by a:
  • A
    $76\ mm$ tall column of mercury.
  • B
    $760\ mm$ tall column of alcohol.
  • ✓
    $76\ cm$ tall column of mercury.
  • D
    $760\ cm$ tall column of mercury.
Answer
Correct option: C.
$76\ cm$ tall column of mercury.
The standard temperature and pressure ($STP$), refers to nominal conditions in the atmosphere at sea level, which supports $760$ millimeters in a mercurial barometer ($760 mm$ Hg).
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MCQ 51 Mark
Some mustard oil is kept in a beaker. It will exert pressure:
  • A
    Downwards only.
  • B
    Sideways only.
  • C
    Upwards only.
  • ✓
    In all directions.
Answer
Correct option: D.
In all directions.
Explanation:
Fluid exerted pressure in all direction.
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MCQ 61 Mark
When we press the bulb of a dropper with its nozzle kept in water air in the dropper is seen to escape in the form of bubbles. Once we release the pressure on the bulb, water gets filled in the dropper. The rise of water in the dropper is due to:
  • A
    Pressure of water.
  • B
    Gravity of the earth.
  • C
    Shape of rubber bulb.
  • ✓
    Atmospheric pressure.
Answer
Correct option: D.
Atmospheric pressure.
Explanation:
Atmospheric pressure exerted by air.
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MCQ 71 Mark
Which of the following change appreciably when a batsman hits a moving cricket ball?
$A.$ Shape.
$B.$ Direction.
$C.$ Size.
$D.$ Speed.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $A$ and $C$
  • ✓
    $B$ and $D$
Answer
Correct option: D.
$B$ and $D$
The force can change the direction and Speed of motion.
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MCQ 81 Mark
Which of the following scientists gave the idea of the existence of gravitational force?
  • A
    Einstein.
  • B
    James Watt.
  • C
    Faraday.
  • ✓
    Newton.
Answer
Correct option: D.
Newton.
Explanation:
Newton propound the universal laws of gravitational.
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MCQ 91 Mark
A rectangular wooden block has length, breadth and height of 50cm, 25cm and10cm, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?
  • A
    The maximum pressure is exerted when the length and breadth form the base.
  • B
    The maximum pressure is exerted when length and height form the base.
  • ✓
    The maximum pressure is exerted when breadth and height form the base.
  • D
    The minimum pressure is exerted when length and height form the base.
Answer
Correct option: C.
The maximum pressure is exerted when breadth and height form the base.
Explanation:
Pressure = force / area.
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MCQ 101 Mark
When a force of $5N$ acts on a surface, it produces a pressure of $500Pa$. The area of surface then must be :
  • A
    $10\ cm^2$
  • B
    $50\ cm^2$
  • ✓
    $100\ cm^2$
  • D
    $0.01\ cm^2$
Answer
Correct option: C.
$100\ cm^2$
Pressure $=$ thrust/ area.
Area $=$ Pressure/ Thrust $= 500/ 5 = 100\ cm^2$.
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MCQ 111 Mark
The magnitude of force is expressed in the unit of force called:
  • A
    Pascal.
  • B
    Kelvin.
  • ✓
    Newton.
  • D
    Magdeburg.
Answer
Correct option: C.
Newton.
Explanation:
The unit of force is newton.
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MCQ 121 Mark
Which of the following is not an example of muscular force?
  • A
    A porter carrying a load on a wheel-barrow.
  • ✓
    An apple falling from a tree.
  • C
    A child riding a bicycle.
  • D
    A person drawing water from a well.
Answer
Correct option: B.
An apple falling from a tree.
Explanation:
An apple falling from a tree is an example of gravitational force.
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MCQ 131 Mark
The same force Facts on four different objects having the areas given below, one by one. In which case the pressure exerted will be the maximum ?
  • A
    $ 20 \mathrm{~m}^2 $
  • B
    $ 50 \mathrm{~m}^2 $
  • ✓
    $ 10 \mathrm{~m}^2 $
  • D
    $ 100 \mathrm{~m}^2 $
Answer
Correct option: C.
$ 10 \mathrm{~m}^2 $
$ 10 \mathrm{~m}^2 $
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MCQ 141 Mark
Which of the following is not an effect of force?
  • A
    A force can change the speed of a moving object.
  • ✓
    A force can change the direction of a moving object.
  • C
    A force can change the composition of a moving object.
  • D
    A force can change the shape and size of an object.
Answer
Correct option: B.
A force can change the direction of a moving object.
Explanation:
The force can change the direction of motion.
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MCQ 151 Mark
Which of the following represent correct values for the normal atmospheric pressure?
$A. 101.3$ kilopascals.
$B. 76\ mm$ of mercury.
$C. 101.3$ pascals.
$D. 76\ cm$ of mercury.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $A$ and $D$
  • ✓
    $B$ and $D$
Answer
Correct option: D.
$B$ and $D$
$\text{P}= \frac{\text{F}}{\text{A}}$
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MCQ 161 Mark
Which of the following does not work on the existence of atmospheric pressure?
  • ✓
    Rise of iodine solution in the glass tube of dropper.
  • B
    Rise of cold drink in a long plastic straw.
  • C
    Sticking of suction hook on the wall of a room.
  • D
    Rise of mercury in glass tube of thermometer.
Answer
Correct option: A.
Rise of iodine solution in the glass tube of dropper.
$P =$ height $\times $ density $\times $ gravity.
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MCQ 171 Mark
Which of the following are contact forces?
$A.$ Friction.
$B.$ Gravitational force.
$C.$ Magnetic force.
$D.$ Muscular force.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • ✓
    $A$ and $D$
  • D
    $B$ and $D$
Answer
Correct option: C.
$A$ and $D$
Force applied when it is in contact with the object.
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MCQ 181 Mark
Which of the following is not a non-contact force?
  • A
    Electrostatic force.
  • ✓
    Gravitational force.
  • C
    Frictional force.
  • D
    Magnetic force.
Answer
Correct option: B.
Gravitational force.
Explanation:
Friction force is an example of contact force.
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MCQ 191 Mark
If we release a magnet held in our hand, it falls to the ground. The force responsible for this is:
  • A
    Muscular force.
  • B
    Magnetic force.
  • C
    Electrostatic force.
  • ✓
    Gravitational force.
Answer
Correct option: D.
Gravitational force.
Explanation:
Force applied when it is in non contact with the object.
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M.C.Q. [I MARKS] - Science STD 8 Questions - Vidyadip