FORCE AND PRESSURE
Choose the correct answer:
Q 1. A batsman hits a cricket ball which then rolls on the level ground. After covering a short
distance the ball comes to rest. The ball stops due to
(a) magnetic force
(b) frictional force
(c) gravitational force
(d) muscular force
Q 2. When two forces applied on an object are equal and opposite, then these forces
(a) may move the object.
(b) may stop the object.
(c) may move the object and also cause a change in its shape.
(d) do not move the object but may cause a change in its shape.
Q 3. When two unbalanced forces act on a body, in opposite directions, the net force is equal to
(a) the sum of the individual unbalanced forces.
(b) zero.
(c) difference between the two unbalanced forces and is in the direction of the larger force.
(d) difference between the two unbalanced forces and is in the direction of smaller force.
Q 4. Nails have pointed ends. This results in
(a) a decrease in the force exerted on them.
(b) a decrease in the effect of the force exerted on them.
(c) an increase in the force exerted on them.
(d) an increase in the effect of the force exerted on them.
Q 5. Which of the following is an example of contact force ?
(a) Magnetic force
(b) Muscular force
(c) Electric force
(d) Gravitational force
Q 6. Fruits falling from trees is an example of
(a) gravitational force
(b) muscular force
(c) frictional force
(d) electric force
Q 7. The unit of measuring pressure is
(a) newton
(b) newton/metre
(c) metre2
(d) metre2
/newton
Q 8. In liquids, the pressure
(a) increases with depth
(b) decreases with depth
(c) remains same at all depths (d) sometimes increases sometimes decreases
Q 9. During dry weather, rubbing a plastic scale with dry hair, attracts small pieces of paper. This is due
to
(a) gravitational force
(b) electrostatic force
(c) frictional force
(d) muscular force
Q 10. Which of the following is an example of a non-contact force?
(a) The force exerted by us to lift a bucket
(b) push a stationary car
(c) The force exerted by magnets
(d) Force due to friction
Answers
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Answer:
Q1. (b) frictional force
Q2. (d) do not move the object but may cause a change in its shape.
Q3. (b) zero
Q4. (d) an increase in the effect of the force exerted on them.
Q5. (b) Muscular force
Q6. (a) gravitational force
Q7. Newton /metre square
Q8. (a) increases with depth
Q9. (b) electrostatic force
Q10. (c) The force exerted by magnets