Forces and Laws of Motion-MCQ

1.  The S.I. unit of force is

         I. Kgm/s

        II. Kgm/s²

       III. Newton

       IV. Newton-meter

2.  What do we get by the product of mass and velocity?

         I. Force

        II. Inertia

       III. Momentum

       IV. Newton

3.  The rate of change of momentum of an object is proportional to

         I. Mass of the body

        II. Velocity of the body

       III. Net force applied on the body

       IV. None of these

4.  If two balls of same masses are dropped on sand, the depths of penetration is same if

         I. Heavier ball is dropped faster than lighter ball

        II. Lighter ball is dropped faster than heavier ball

       III. The product ‘mv’ is same for both bodies

       IV. None of these

5.  A coin placed on a card(rested at the edges of the glass) remains at rest because of

         I. Inertia of rest

        II. Two forces act on the coin which balance each other

       III. No unbalanced force acts on it

       IV. All of these

6.  A force of 50N moves a body,

         I. Friction force exerted on the body is less than 50N

        II. Friction force exerted on the body is more than 50N

       III. None of these

       IV. Both of I and II

7.  A fielder giving a swing while catching a ball is an example of

         I. Inertia

        II. Momentum

       III. Newton’s II law of motion

       IV. Newton’s I law of motion

8.  Action and reaction forces

         I. Act on the same body

        II. Act on different bodies

       III. Act in same direction

       IV. Both I and III

9.  When we pedaling the bicycle it stops because

         I. The earth’s gravitational force acts on it

        II. It is not accelerated

       III. No unbalanced force acts on it

       IV. Frictional force acts on it

10.  A football and a stone has same mass

         I. Both have same inertia

        II. Both have same momentum

       III. Both have different inertia

       IV. Both have different momentum