#### Laws of Motion One Mark Questions

11th Standard

Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 10
10 x 1 = 10
1. When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to

(a)

inertia of direction

(b)

inertia of motion

(c)

inertia of rest

(d)

absence of inertia

2. A book is at rest on the table which exerts a normal force on the book. If this force is considered as reaction force, what is the action force according to Newton's third law?

(a)

Gravitational force exerted by Earth on the book

(b)

Gravitational force exerted by the book on Earth

(c)

Normal force exerted by the book on the table

(d)

None of the above

3. Two masses m1 and m2 are experiencing the same force where m1 < m2.The ration of their acceleration $\frac { { a }_{ 1 } }{ { a }_{ 2 } }$is

(a)

1

(b)

less than 1

(c)

greater than 1

(d)

all the three cases

4. An object of mass m begins to move on the plane inclined at an angle θ. The coefficient of static friction of inclined surface is μs.The maximum static friction experienced by the mass is

(a)

mg

(b)

μs mg

(c)

μs mg sin ፀ

(d)

μs mg cos ፀ

5. Action and reaction

(a)

act on two different objects

(b)

have opposite direction

(c)

have equal magnitude

(d)

all of these

6. A heavy iron rod of weight W is having its one end on the ground and the other on the shoulder of a man. The rod makes an angle ፀ with the horizontal. What is the weight experienced by the man?

(a)

W sin ፀ

(b)

W cos ፀ

(c)

W

(d)

$\frac { W }{ 2 }$

7. A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. A force F is applied at the free end of the rope. The force exerted by the rope on the block

(a)

$\frac { MF }{ M+m }$

(b)

$\frac { M+m }{ MF }$

(c)

$\frac { M }{ M-m }$ .F

(d)

$\frac { M-m }{ M }$ .F

8. A spacecraft of mass M moving with velocity v in free space explodes and breaks into two pieces. After the explosion a mass m of the spacecraft is left stationary. The velocity of  other part is

(a)

$\frac { mv }{ M-n }$

(b)

$\frac { M+n }{ Mv }$

(c)

$\frac { Mv }{ M-m }$

(d)

$\frac { Mv }{ m }$

9. A car when passes through a bridge exerts a force on it which is equal to

(a)

$mg+\frac { { Mv }^{ 2 } }{ r }$

(b)

$\frac { { Mv }^{ 2 } }{ r }$

(c)

$mg-\frac { { Mv }^{ 2 } }{ r }$

(d)

none

10. A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in the plane. It follows that

(a)

The speed of the particle is constant.

(b)

The motion is that of projectile.

(c)

The acceleration of the particle is constant.

(d)

The velocity of the particle is constant