Class 9 Physics Unit-5: Forces and Matter, Solved MCQs With Verified Answers. (Sindh Textbook Board, Jamshoro)

1. The springs in brakes and clutches are used

(a) To restore the original position
(b) To measure forces
(c) To absorb shocks
(d) To absorb strain energy

... Answer is (a) To restore the original position
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2. If the material recovers the original dimensions when an external force is removed, this deformation is known as ________________ deformation.

(a) Inelastic
(b) Permanent
(c) Elastic
(d) Irreversible

... Answer is (c) Elastic
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3. Which of the following material is more elastic?

(a) Rubber
(b) Glass
(c) Steel
(d) Wood

... Answer is (c) steel
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4. If a spring stretches easily then its spring constant has

(a) Large value
(b) Small value
(c) Constant Value
(d) Both (a) and (b)

... Answer is (a) Large value
Form Hook's Law k = F/x

5. What is the unit for the spring constant?

(a) N m
(b) N m⁻²
(c) N m⁻¹
(d) N m²

... Answer is (c) N m⁻¹
Form Hook's Law k = F/x

6. The spring obeys Hooke's law for the earlier extensions and when the spring becomes damaged it does not appear to do so; Fig 5.12. Estimate, from the graph, after addition of which weight the spring damaged.

(a) 1.5 N
(b) 8 N
(c) 1.6 N
(d) 2.0 N

... Answer is (c) 1.6 N
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7. Which of the following is not a unit of pressure? :

(a) Pascal
(b) Bar
(c) Atmosphere
(d) Newton

... Answer is (d) Newton
Newton in the unit of force

8. If a metal block applies a force of 20 N on an area of 5 cm². Find the pressure being applied by the block on the area of

(a) 100 N cm⁻²
(b) 0.8 N cm⁻²
(c) 0.25 N cm⁻²
(d) 4 N cm⁻²

... Answer is (d) 4 N cm⁻²
P = F/A

9. Fig5.13 shows a container with three spouts. The container is filled with water. Jets of water pour out of the spouts. Why does the jet of water from the bottom spout go farthest out from the container?

(a) Pressure decreases with depth.
(b) Pressure increases with depth.
(c) More water is available to flow out from the bottom.
(d) Density of water is different at different places.

... Answer is (a) Pressure increases with depth.
At the bottom spout, there is more pressure (more water above this spout) than the other spouts. So water pours out at high speed than at other points.

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