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11th Physics Weekly Test - 3 (Laws of motion)

MABS Institution

11th Physics Weekly Test - 3 (Laws of motion)-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

An athlete running in a race will continue to run even after reaching the finishing point. It is due to:

inertia of rest
inertia of motion
inertia of direction
both (b) and (c)

When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to

inertia of direction
inertia of motion
inertia of rest
absence of inertia

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 μ_s.The maximum static friction experienced by the mass is

mg
μ_s mg
μ_s mg sin ፀ
μ_s mg cos ፀ

The law which is valid in both inertial and non-inertial frame is

Newton's first law
Newton's second law
Newton's third law
none

The centrifugal force appears to exist

only in inertial frames
only in rotating frames
in any accelerated frame
both in inertial and non-inertial frames

A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between

16 m/s and 17 m/s
13 m/s and 14 m/s
14 m/s and 15 m/s
15 m/s and 16 m/s

A force of 2.5 N acts on a body of mass 10 g. What is the acceleration of the body?

1.5 x 10² ms^-2
2.0 x 10³ ms^-2
2.5 x 10³ ms^-2
3.0 x 10² ms^-2

A force vector applied on a mass is represented \(\vec { F } =6\hat { i } -8\hat { j } +10\hat { k } \) and accelerates with 1 m/s². What will be the mass of the body?

10 kg
20 kg
10\(\sqrt { 2 } \) kg
2\(\sqrt { 10 } \) kg

A lift of mass 1000 kg which is moving with the acceleration of 1 m/s² in the upward direction, then the tension developed in the string which is connected to lift is

9800 N
10,800 N
11,000 N
10,000 N

The action and reaction forces acting on

same body
different bodies
either same or different bodies
none of the above

A ball of 300 g mass moving with a speed of 20 m/s rebounds after striking normally a perfectly elastic wall. The change in momentum of a ball is

12 kg ms-1
-12 kg ms^-1
6 kg ms^-1
-6 kg ms^-1

A block of mass 3kg is at rest on a rough inclined plane with angle of inclination 30° with horizontal. If \(\mu\)s = 0.7, then the frictional force is

17.82 N
1.81 N
3.63 N
2.1 N

A body of mass 3 kg hits a wall at an angle of 60° and returns at the same angle. The impact time was 0.2 sec. The force exerted on the wall

150\(\sqrt { 3 } \) N

A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ?(g = 10 m/s²)

5 m/s²
10 m/s²
25 m/s²
2.5 m/s²

The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is

4 m s^-2 upwards
4 m s^-2 downwards
14 m s^-2 upwards
30 m s^-2 downwards

Momentum is closely related to

Force
Impulse
Velocity
K.E

When two surfaces are coated with a lubricant, then they:

stick to each other
slide upon each other
roll upon each other
none of these

The lines of forces act at a common point is called as

concurrent forces
coplanar forces
equilibrant
resultant

Newton's second and third laws of motion lead to the conservation of:

linear momentum
angular momentum
potential energy
kinetic energy

If μs is Coefficient of static friction and μk is coefficient of kinetic friction then

There is no relation between μs and μk
μs > μk
μs = μk
μs < μk

Choose appropriate free body diagram for the particle experiencing net acceleration along negative y direction. (Each arrow mark represents the force acting on the system).

A particle revolves round a circular path. The acceleration of the particle is:

along the circumference of the circle
along the tangent
along the radius
zero

A particle moves along a circular path under the action of a force. The work done by the force is

Positive and non zero
zero
Negative and non zero
none of the above

The product of mass and velocity is

force
impulse
momentum
acceleration

Centripetal force acts in

inertial frame
non inertial frame
both (a) and (b)
linear motion

A lift is moving down with an acceleration of 4.9 ms^-2. The percentage change in the weight of a person in the lift is

75%
50%
25%
12.5%

The angle between the normal force and the resultant force of normal force and maximum frictional force is

angle of friction
angle of repose
angle of inclination
none of the above

Three forces F₂, F₂ & F₃ are acting on a particle of mass m such that F₂ & F₃ are mutually perpendicular, then the particle remains stationary. If the force F₁ is now removed, then the acceleration of the particle is

\(\frac { { F }_{ 1 } }{ m } \)
\(\frac { { F }_{ 2 }{ F }_{ 3 } }{ mF } \)
\(\frac { { F }_{ 2 }-{ F }_{ 3 } }{ m } \)
\(\frac { { F }_{ 2 } }{ m } \)

A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is

MV
1.5 MV
2MV
zero

The magnitude of static frictional force f_s lies between

\(0\le f\le { \mu }_{ s }N\)
\(0\ge f\ge { \mu }_{ s }N\)
0 and 1
0 and minimal static frictional force.

A bullet of mass 50g moving with a speed of 150 ms^-2 penetrates into wood for a distance of 10 cm.The average force required to stop the bullet is

5.625 x 10³ N
4.275 x 10³ N
2.525 x 10³N
3.725 x 10³N

Identify the correct statement

static friction depends on the area of contact
kinetic friction depends on the area of contact
coefficient of static friction does not depend on the surfaces in contact
coefficient of kinetic function is less than the coefficient of static friction

Action and reaction

act on two different objects
have opposite direction
have equal magnitude
all of these

A body whose momentum is constant must have constant

Force
Acceleration
Velocity
All

Change in momentum of a body is:

force
acceleration
work
impulse

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