Common Forces in Mechanics, Class 11 Physics NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. A train is moving along a horizontal track. A pendulum suspended from the roof of the train makes an angle of 5° with the vertical. The acceleration of the train is

0.60 ms^-2

0.70 ms^-2

1 ms^-2

0.87 ms^-2

Your comments:

Question 1 of 20

2. A body of weight 100 N is suspended with the help of strings as shown in figure. The tensions T₁ and T₂ will be

T₁ = 70.2 N, T₂ = 80.65 N

T₁ = 10.2 N, T₂ = 20.2 N

T₁ = 73.2 N, T₂ = 89.65 N

T₁ = 100 N, T₂ = 200 N

Your comments:

Question 2 of 20

3. For a body along the inclined plane, the normal reaction acts

down the inclined plane

perpendicular to the inclined plane

up the inclined plane

none of the above

Your comments:

Question 3 of 20

4. Two forces F₁ and F₂ are acting on a particle. The particle will remain at rest if two forces are

Opposite

Equal and Opposite

Unequal and in same direction

Equal

Your comments:

Question 4 of 20

5. If no resultant force acts on a body then the body will be in

rest

motion

earlier state (no change in state)

none of the above

Your comments:

Question 5 of 20

6. A body is at rest though forces act on it. Then

net force on the body is zero

this is not possible

acceleration of the body < 0

all forces must lie along same line

Your comments:

Question 6 of 20

7. In mechanics, if the net external force on the particle is zero, then the particle is said to be in state of

accelerated motion

retarding motion

de-accelarated motion

equilibrium

Your comments:

Question 7 of 20

8. A book is lying on the table. What is the angle between the action of the book on the table and reaction of table on the book?

Zero degree

Forty five degree

Hundred eighty degrees

Ninty degree

Your comments:

Question 8 of 20

9. A mass of 6 kg is suspended by a rope of length 2 m from a ceiling. A force of 50 N in the horizontal direction is applied at the mid-point of the rope, as shown. What is the angle the rope makes with the vertical in equilibrium?

60°

40°

50°

30°

Your comments:

Question 9 of 20

10. Which of the conditions shows that the particles are in equilibrium state for two forces F₁ and F₂ acting on the body?

F₁= F₂

F₁= 2F₂

F₁ = -F₂

2F₁=F₂

Your comments:

Question 10 of 20

11. Which of the following forces is not considered as a contact force in Mechanics?

Tensional force

Gravitational force

Viscous force

Frictional force

Your comments:

Question 11 of 20

12. Weight and normal reaction forces

always act opposite to each other

act through the centre of gravity of the body

constitute action reaction forces

are both contact forces

Your comments:

Question 12 of 20

13. The contact forces of mechanics are fundamentally derived from

Gravitational forces

Electrical forces

Friction

Viscous forces

Your comments:

Question 13 of 20

14. The minimum angle that an inclined plane makes with the horizontal when a body placed on it just begins to slide down is called

angle of repose

angle of declination

angle on inclination

angle of acceleration

Your comments:

Question 14 of 20

15. A body in equilibrium:

has zero resultant of all internal forces but not of external ones

has external forces balanced by internal forces

has two equal forces acting in opposite directions

has zero resultant of all the external forces acting on it.

Your comments:

Question 15 of 20

16. Spring force is a restoring force.

can’t predict

True

False

none of the above

Your comments:

Question 16 of 20

17. The forces F₁, F₂, and F₃ are acting on a particle of mass m, such that F₂ and F₃ are mutually perpendicular and under the effect of F₁, F₂, and F₃ , the particle remains stationary. What will be the acceleration of the particle, if the force F₁ is removed?

A

B

C

D

Your comments:

Question 17 of 20

18. Tension on an almost massless rope being pulled by two boys, one small and one big, will be

same along the length of entire length of the rope

more on the big boy end

more on the small boy end

none of the above

Your comments:

Question 18 of 20

19. Which of the following cannot be regarded as yet another kind of force?

centripetal force

gravitational force

electrostatic force

magnetic force

Your comments:

Question 19 of 20

20. The component of contact force normal to the surfaces in contact is called

Tension

Friction

Gravitational component

Normal reaction

Your comments:

Question 20 of 20

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