Force and Laws of Motion MCQ for Class 9 Science Chapter 9 with Answer

# Force and Laws of Motion MCQ Questions for Class 9 Science Chapter 9 with Answers

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 9 Science book Chapter 9 Force and Laws of Motion with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 9 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Force and Laws of Motion. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 9 free Pdf and prepare to exam and help students understand the concept very well.

## Q1. Among the equal-sized stone and a football, the inertia will be higher of:

(i) football
(ii) stone
(iii) both
(iv) none of them

(ii) stone

#### Q2. A water tank filled upto 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

(i) Move backward
(ii) Move forward
(iii) Come to the rest
(iv) Be unaffected

(ii) Move forward

### Q3. According to the third law of motion, action and reaction

(i) always act on the same body
(ii) always act on different bodies in opposite directions
(iii) have same magnitude and directions
(iv) act on either body at normal to each other

(ii) always act on different bodies in opposite directions

## Q4. The inertia of an object tends to cause the object

(i) to increase its speed
(ii) to decrease its speed
(iii) to resist any change in the state of rest or of motion
(iv) to decelerate due to friction

(iii) to resist any change in the state of rest or of motion

## Q5. The inertia of an object tends to cause an object :

(i) to increase its speed
(ii) to decrease its speed
(iii) to resist a change in its state of motion
(iv) to decelerate due to friction

(iii) to resist a change in its state of motion

## Q6. Under which of the following conditions, Van der Waal’s gas approaches ideal behaviour ?

(i) Extremely low pressure
(ii) High pressure
(iii) Low product of PV
(iv) Low temperature

(iii) Low product of PV

## Q7. Friction is:

(i) useful to us
(ii) harmful to us
(iii) both useful as well as harmful to us
(iv) none of them.

(iii) both useful as well as harmful to us

## Q8. When a balloon held between the hands is pressed, its shape changes. This happens because:

(i) Balanced forces act on the balloon
(ii) Unbalanced forces act on the balloon
(iii) Frictional forces act on the balloon
(iv) Gravitational force acts on the balloon

(i) Balanced forces act on the balloon

(i) mass
(ii) energy
(iii) momentum
(iv) velocity

(iii) momentum

## Q10. Quantitative expression of force is given by:

(i) Newton’s second law of motion.
(ii) Newton’s third law of motion.
(iii) Newton’s first law of motion.
(iv) Newton’s law of gravitation.

(i) Newton’s second law of motion.

### Q11. A passenger in a moving train tosses a coin which falls behind him. This shows that the motion of train is

(i) accelerated
(ii) uniform
(iii) retarded
(iv) along circular track

(i) accelerated

(i) NH3
(ii) O2
(iii) CH4
(iv) H2S

(iv)

## Q13. The unit of measuring the momentum of a moving body is:

(i) m/s
(ii) kg.m/s
(iii) kg.m/s²
(iv) N m²/kg²

(ii) kg.m/s

### Q14. If the mass of a body is doubled and its velocity becomes half, then the linear momentum of the body will

(i) remain same
(ii) become double
(iii) become half
(iv) become four times.

(i) remain same

## Q15. The S.I. unit of force is

(i) Newton-metre
(ii) Newton
(iii) Newton per second
(iv) Newton per square metre

(ii) Newton

#### Q16. If we release a magnet held in our hand, it falls to the ground. The force which makes the magnet fall down is an example of :

(i) balanced force
(ii) unbalanced force
(iii) magnetic force
(iv) muscular force

(ii) unbalanced force

## Q17. An ideal gas expands according to PV = constant. On expansion,the temperature of gas

(i) will rise
(ii) will drop
(iii) will remain constant
(iv) cannot be determined because the external pressure is not known

(iii) will remain constant

## Q18. A man is standing on a boat in still water. If he walks towards the shore, then the boat will

(i) move away from the shore
(ii) move towards the shore
(iii) remain stationary
(iv) none of these

(i) move away from the shore

## Q19. If the force acting on the body is zero. Its momentum is:

(i) Zero
(ii) Constant
(iii) Infinite
(iv) None of the above

(ii) Constant

## Q20. When a rubber balloon held between the hands is pressed, its shape changes. This happens because :

(i) balanced forces act on the balloon
(ii) unbalanced forces act on the balloon
(iii) frictional forces act on the balloon
(iv) gravitational forces act on the balloon

(i) balanced forces act on the balloon

## Q21. Which statement about real gases is true ?

(i) Forces of attraction and repulsion exist between gas particles as close range
(ii) The behaviour of real gases can be exactly predicted usig the ideal gas law
(iii) The volume of the gas particle is zero
(iv) The mass of the gas particles is zero

(i) Forces of attraction and repulsion exist between gas particles as close range

## Q22. A ball is thrown vertically upward in a train moving with uniform velocity. The ball will

(i) fall behind the thrower
(ii) fall ahead of the thrower
(iii) return back to the thrower
(iv) fall on the left of the thrower

(iii) return back to the thrower

(i) 10 N
(ii) 15 N
(iii) 5 N
(iv) 25 N

(iii) 5 N

## Q24. A real gas at a very high pressure occupies

(i) Less volume then that of an ideal gas under identical condition
(ii) More volume than that of an ideal gas under identical conditions
(iii) Same volume than that of an ideal gas under identical conditions
(iv) Cannot be predicted

(ii) More volume than that of an ideal gas under identical conditions

(i) 5 : 6
(ii) 1 : 2
(iii) 12 : 5
(iv) 5 : 12

(iv) 5 : 12

(i) 36
(ii) 4
(iii) 2
(iv) 18

(ii) 4

## Q27. Temperature according to kinetic theory, is a measure of

(i) Average translational kinetic energy of gas molecules
(ii) Intermolecular attraction
(iii) Intermolecular distances
(iv) Volume f gas

(i) Average translational kinetic energy of gas molecules

## Q28. A force is defined as a

(i) Fall
(ii) Pull
(iii) Push or Pull
(iv) Push

(iii) Push or Pull

## Q29. The acceleration of an object is

(i) inversely proportional to its mass
(ii) directly proportional to the applied force
(iii) resisted by inertia
(iv) all of the above

(iv) all of the above

## Q30. Change in momentum when a car weighing 700kg changes its speed from 100m/s to 200 m/s is:

(i) 14000 kg.m/s
(ii) 10500000 kg.m/s
(iii) 21000000 kg.m/s
(iv) 70000 kg.m/s

(iv) 70000 kg.m/s

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