Question

MCQ with one or more correct answers.

1. The force exists when two solid surfaces are in contact is [ ]

a) Gravitational force b) Contact force c) Magnetic force d) Electric force

2. The component of reaction (R) perpendicular to the plane of contact is called [ ]

a) Normal force b) Frictional force c) Reaction force d) All of these

3. The expression for reaction force ‘R’ is [ ]

a) 2 2 2 R N f   b) 2 2 2 R N f   c) 2 2 R N f   d) 2 2 R N f  

4. Statement (A) : Friction always supports the relative motion [ ]

Statement (B) : Friction always opposes the motion

a) Both A and B are true b) Both A and B are false

c) A is true, b is false d) A is false, B is true

5. Angle of friction [ ]

a) Angle between normal reaction and frictional force

b) Angle between frictional force and reaction froce

c) Angle between a normal reaction and reaction force

d) Angle between normal force and the surface in contact

6. Normal force is [ ]

a) The force perpendicular to the surface in contact

b) The force parallel to the surface in contact

c) The force antiparallel tot he surface in contact

d) None of these

7. A body of mass 10 kg is testing on a perfect smooth surface. Then reaction force is [ ]

a) 0 N b) 10 N c) 10N d) 1.0 N

8. If frictional force is equal to the normal force acting on a bod, then reaction force is equal to

a) 2N b) 2 N c) 2 N d) N 2 [ ]

9. A person is able to walk on road because of [ ]

a) H is weight b) He learned to walk c) Friction d) Gravitational force

10. A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3 N. Then the

magnitude of reaction is (g = 10 ms–2) [ ]

a) 5 N b) 50 N c) 25 N​

Answer 1

Answer:

1. contect force

2. d

Explanation:

hope it help you

Answer 2

Answer:

1ANS= b

2ANS=a

Explanation:

1 . when two or more objects are in contact a contact force acts on it

2 .normal force is always perpendicular to the surface