Class 9 Physics Chapter 4 MCQs Federal Board
Class 9 Physics Chapter 4 MCQs Federal Board
Tick the correct option.
1) A seesaw balances perfectly with two children of equal weight sitting at equal distances from the fulcrum. If one child moves closer to the fulcrum:
A) The seesaw remains balanced.
B) The seesaw tips towards the child who moved closer.
C) The seesaw tips towards the child who stayed further away.
D) The seesaw topples.
Correct option is (c)
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2) When line of action of the applied force passes through its pivot point then moment of force acting on the body is:
A) maximum
B) minimum
C) zero
D) infinite
Correct option is (c)
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3) If a body is at rest or moving with uniform rotational velocity, then torque acting on the body will be:
A) maximum
B) minimum
C) zero
D) infinite
Correct option is (c)
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4) A body is equilibrium must not have:
A) speed
B) quantity of motion
C) velocity
D) acceleration
Correct option is (d)
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5) A uniformly rotating fan is said to be in:
A) static equilibrium only
B) dynamic equilibrium only
C) both in static and dynamic equilibrium
D) not in equilibrium
Correct option is (b)
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6) You throw a weighted fishing net into a calm lake. As the net sinks, it opens fully underwater, spreading out its mesh evenly. Compared to the moment it left your hand, where is the net’s center of mass now?
A) Higher in the water column.
B) Lower in the water column.
C) At the same depth but slightly shifted horizontally.
D) Unchanged from its position when thrown.
Correct option is (d)
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7) A tightrope walker is carrying a long pole while walking across a rope. The stability of the walker is affected if the pole is:
A) long and placed vertically
B) long and placed horizontally
C) short and placed vertically
D) short and placed vertically
Correct option is (b)
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8) It is more difficult to walk on a slippery surface than on a non slippery one because of:
A) reduced friction
B) increased friction
C) high grip
D) lower weight
Correct option is (a)
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9) For an object moving with terminal velocity, its acceleration:
A) increases with time
B) decreases with time
C) is zero
D) first increases then decreases
Correct option is (c)
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10) The correct order of comparison for the terminal speeds of a raindrop, snow flake, and hailstone is:
A) Raindrop>Snowflake>Hailstone
B) Hailstone>Raindrop>Snowflake
C) Snowflake>Raindrop>Hailstone
D) Raindrop=Snowflake=Hailstone
Correct option is (b)
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11) You are trying to loosen a nut using a spanner, but it is not working. In order to open the nut, you need to:
A) insert a pipe to increases length of spanner
B) use a spanner of small length
C) use plastic and soft spanner
D) tie a rope with spanner
Correct option is (a)
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12) The force that always changes direction of velocity and not its magnitude is called:
A) gravitational force
B) electric force
C) centripetal force
D) friction
Correct option is (c)
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13) The reason that a car moving on a horizontal road gets thrown out of the road while taking a turn is:
A) the reaction of the ground
B) rolling friction between tyre and road
C) gravitational force
D) lack of sufficient centripetal force
Correct option is (d)
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14) A car drives at steady speed around a perfectly circular track.
A) The car’s acceleration is zero.
B) The net force on the car is zero.
C) Both are acceleration and net force on the car point outward.
D) Both are acceleration and net force on the car point inward.
Correct option is (d)
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15) A satellite of mass ‘m’ is revolving around the earth with an orbital speed ‘v’. If mass of the satellite is doubled, its orbital speed will become:
A) double
B) half
C) one fourth
D) remain the same
Correct option is (d)
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