# Force and Laws of Motion Class 9 Science Chapter 9 MCQ Question Answer NCERT Solution

NCERT Class 9 Science Chapter 9 Force and Laws of Motion MCQ Question Answer Solution For School Students of Class 9th. We also Provides Notes and Important Questions for Class 9 Science. NCERT Class 9th Science book is applied in mostly boards like CBSE, HBSE, RBSE, Up Board, MP Board and also some other state boards.

Also Read:- Class 9 Science NCERT Solution

NCERT Class 9 Science Chapter 9 Force and Laws of Motion MCQ Question and Answer for CBSE, HBSE and Other Boards Solution.

## Force and Laws of Motion Class 9 Science MCQ

1. laws of motion were given by
(A) Galileo Galilei
(B) Newton
(C) Einstein
(D) Neils bohr

Ans. (B) Newton

2. How many laws of motion were given by newton?
(A) 1
(B) 2
(C) 3
(D) 4

Ans. (C) 3

3. “An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force”. This is
(A) First law of motion
(B) Second law of motion
(C) Third law of motion
(D) none of the above.

Ans. (A) First law of motion

4. “For every action there is equal and opposite reaction”. This is
(A) First law of motion
(B) Second law of motion
(C) Third law of motion
(D) none of the above.

Ans. (C) Third law of motion

5. “The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force”. This is
(A) First law of motion
(B) Second law of motion
(C) Third law of motion
(D) none of the above.

Ans. (B) Second law of motion

6. SI unit of force is
(A) Newton
(B) Joule
(C) Meter per Second
(D) m-1

Ans. (A) Newton

7. The momentum p of an object is defined by
(A) p = mt
(B) p = mv
(C) p = ma
(D) none of the above

Ans. (B) p = mv

8. SI unit of momentum of an object is
(A) kg m s
(B) kg m s-1
(C) Kg m s-2
(D) Kg s-1

Ans. (B) kg m s-1

9. The natural tendency of objects to resist a change in their state of rest or of uniform motion is called
(A) mass
(B) inertia
(C) force
(D) momentum

Ans. (B) inertia

10. Formula of force is
(A) F = ma
(B) F = mt
(C) F = mv
(D) none of the above

Ans. (A) F = ma

11. Which of the following is example of Third law of motion?
(A) A forward force on the bullet and recoil of the gun
(B) As the sailor jumps in forward direction, the boat moves backwards
(C) Both (A) and (B)
(D) none of the above.

Ans. (C) Both (A) and (B)

12. In an isolated system, the total momentum
(A) changes every second
(B) remains conserved
(C) may be changed or conserved
(D) none of the above.