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Science M.C.Q. [I MARKS]

Friction · Jharkhand Board (JAC) STD 8 (Jharkhand - English Medium). 20 questions.

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M.C.Q. [I MARKS]

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20 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The weight of an object can be measured by a:
  • A
    Beam balance.
  • B
    Analytical balance.
  • ✓
    Spring balance.
  • D
    Physical balance.
Answer
Correct option: C.
Spring balance.
Explanation:
The spring balance measures weight of an object.
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MCQ 21 Mark
Ball bearing is a device which usually converts:
  • A
    Rolling friction into sliding friction.
  • B
    Static friction into sliding friction.
  • ✓
    Sliding friction into rolling friction.
  • D
    Rolling friction into static friction.
Answer
Correct option: C.
Sliding friction into rolling friction.
Explanation:
Because rolling friction allows to move heavier objects from one place to other easily.
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MCQ 31 Mark
Which of the following will produce the maximum friction?
  • ✓
    Rubbing of sand paper on glazed paper.
  • B
    Rubbing of sand paper on glass table top.
  • C
    Rubbing of sand paper on aluminium frame.
  • D
    Rubbing of sand paper on sand paper.
Answer
Correct option: A.
Rubbing of sand paper on glazed paper.
Explanation:
As the roughness of the surface increases, the friction increases.
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MCQ 41 Mark
A boy runs his toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
  • ✓
    Wet marble floor, Dry marble floor, Newspaper, Towel.
  • B
    Newspaper, Towel, Dry marble floor, Wet marble floor.
  • C
    Towel, Newspaper, Dry marble floor, Wet marble floor.
  • D
    Wet marble floor, Dry marble floor, Towel, Newspaper.
Answer
Correct option: A.
Wet marble floor, Dry marble floor, Newspaper, Towel.
Explanation:
As the roughness of the surface increases, the friction force increases.
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MCQ 51 Mark
If the static friction between two surfaces $X$ and $Y$ is found to be $20N$, then the rolling friction between these two surfaces should most likely be:
  • A
    $25N.$
  • B
    $20N.$
  • ✓
    $5N.$
  • D
    $50N.$
Answer
Correct option: C.
$5N.$
The relationship between the three types of friction is:
The static friction > Sliding Friction > Rolling friction Thus the rolling friction will be less than $20N.$
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MCQ 61 Mark
A book is lying on the horizontal table top. If we tilt the table a little, then the book starts sliding down slowly. This happens because:
  • A
    Sliding friction is greater than static friction.
  • ✓
    Sliding friction is less than force of gravity.
  • C
    Static friction is greater than sliding friction.
  • D
    Force of gravity is less than sliding friction.
Answer
Correct option: B.
Sliding friction is less than force of gravity.
Explanation:
The book starts sliding down slowly sliding slowly, because the sliding friction is less than force of gravity.
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MCQ 71 Mark
The frictional force exerted by a fluid is called:
  • A
    Brag.
  • B
    Drab.
  • ✓
    Drag.
  • D
    Tread.
Answer
Correct option: C.
Drag.
Explanation:
The frictional force exerted by fluids is called drag force.
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MCQ 81 Mark
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. The correct arrangement is:
  • A
    Rolling, Static, Sliding.
  • B
    Rolling, Sliding, Static.
  • ✓
    Static, Sliding, Rolling.
  • D
    Sliding, Static, Rolling.
Answer
Correct option: C.
Static, Sliding, Rolling.
Explanation:
The static friction > Sliding Friction > Rolling friction.
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MCQ 91 Mark
If the sliding friction between two surfaces is found to be $8N$, then the static friction between these two surfaces is most likely to be:
  • A
    $5N.$
  • ✓
    $10N.$
  • C
    $4N.$
  • D
    $2N.$
Answer
Correct option: B.
$10N.$
The static friction is always greater than sliding friction.
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MCQ 101 Mark
If the static friction between two surfaces $P$ and $Q$ is measured to be $50 N,$ then the sliding friction between these two surfaces is most likely to be:
  • A
    $75N.$
  • ✓
    $45N.$
  • C
    $55N.$
  • D
    $65N.$
Answer
Correct option: B.
$45N.$
The static friction > Sliding Friction > Rolling friction.
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MCQ 111 Mark
The friction between two surfaces does not depend on one of the following. This one is:
  • ✓
    Amount of surface area of the two objects which is in contact with each other.
  • B
    Weight of the object which tends to move on the surface of other object.
  • C
    Degree of smoothness of surfaces of two objects in contact with each other.
  • D
    Degree of roughness of surfaces of two objects in contact with each other.
Answer
Correct option: A.
Amount of surface area of the two objects which is in contact with each other.
Explanation:
Friction does not depend on the area of contact.
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MCQ 121 Mark
A big wooden box is being pushed on the ground from east to west direction. The force of friction due to ground will act on this box towards:
  • A
    North direction.
  • B
    South direction.
  • C
    East direction.
  • ✓
    West direction.
Answer
Correct option: D.
West direction.
Explanation:
The force of friction acts opposite to the direction of motion.
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MCQ 131 Mark
Which of the following should be used to reduce friction on a carrom board?
  • A
    A lubricating oil.
  • ✓
    A dry lubricant.
  • C
    A layer of grease.
  • D
    A ball bearing.
Answer
Correct option: B.
A dry lubricant.
Explanation:
Using talcum powder to reduce the friction on carom board.
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MCQ 141 Mark
A person has applied some mustard oil on his hands. Which of the following objects will become most difficult for him to hold in his hand?
  • A
    Earthen cup (kulhar).
  • B
    Thermocol tumbler.
  • ✓
    Glass tumbler.
  • D
    Wooden cup.
Answer
Correct option: C.
Glass tumbler.
Explanation:
Mustard oil reduces the friction on his hands. So, Glass tumbler will be most difficult to handle.
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MCQ 151 Mark
A spring balance can be used to measure:
$A.$ Mass of an object.
$B.$ Force acting on an object.
$C.$ Density of an object.
$D.$ Weight of an object.
  • A
    $A$ and $B$
  • B
    $B$ and $C$
  • ✓
    $B$ and $D$
  • D
    Only $D$
Answer
Correct option: C.
$B$ and $D$
A spring balance can measure both the force acting on it as well as the weight of the object.
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MCQ 161 Mark
Which of the following statements is incorrect?
  • A
    Static friction is greater than rolling friction.
  • B
    Sliding friction is less than rolling friction.
  • C
    Rolling friction is less than static friction.
  • ✓
    Static friction is greater than sliding friction.
Answer
Correct option: D.
Static friction is greater than sliding friction.
Explanation:
The static friction > Sliding Friction > Rolling friction.
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MCQ 171 Mark
Which of the following does not have a streamlined shape?
  • A
    Aeroplane.
  • B
    Boat.
  • C
    Bird.
  • ✓
    Bus.
Answer
Correct option: D.
Bus.
Explanation:
Bus is not streamlined shape. It is a cuboid shape.
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MCQ 181 Mark
Which of the following is not an advantage of friction?
  • A
    It enables drawing to be made on paper.
  • B
    It enables fallen things to be picked up.
  • ✓
    It enables rubber pads to be rubbed off.
  • D
    It enables vehicles to move on ground.
Answer
Correct option: C.
It enables rubber pads to be rubbed off.
Explanation:
Friction does wear and tear of the objects.
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MCQ 191 Mark
Four similar cars having exactly the same mass are running at the same speed on the same road when brakes are applied at the same time. The cars come to a stop after covering distances of $5\ m, 5.5\ m, 4.8\ m$ and $5.2\ m$ respectively. The friction between the brake pads and discs will be the maximum in the car which travels the distance of:
  • A
    $5\ m.$
  • B
    $5.5\ m.$
  • ✓
    $4.8\ m.$
  • D
    $5.2\ m.$
Answer
Correct option: C.
$4.8\ m.$
As the distance travelled is the least in $4.8\ m$, thus friction would have been the largest.
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MCQ 201 Mark
A body shape which offers very little resistance to the flow of air (or water) around it is called:
  • A
    Trimlined shape.
  • B
    Steamlined shape.
  • C
    Streaklined shape.
  • ✓
    Streamlined shape.
Answer
Correct option: D.
Streamlined shape.
Explanation:
A body shape which offers very little resistance to the flow of a fluid around it, is called streamlined shape.
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