Force, Work, Energy and Power Test

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Force, Work, Energy and Power Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are correct for frictional force?
(a)A frictional force acts in the direction of the motion of the object.
(b)Frictional force is a kind of contact force.
(c)It acts in opposite direction of the motion and parallel to the surface in contact.
(d)Frictional force is always a curse in the nature.

A
Only (a) and (b)

B
Only (a) and (c)

C
Only (b) and (c)

D
Only (c) and (d)

E
Only (b) and (d)
Question 2
1 / -0

If a car with a mass of 1000 kg attains an acceleration of 5 m/s² in 5 seconds after the start, what will be the magnitude of its momentum?

A
2.5 x 10² kgm/s

B
2.5 x 10³ kgm/s

C
2.5 x 10⁴ kgm/s

D
2.5 x 10⁵ kgm/s

E
2.5 x 10⁶ kgm/s
Question 3
1 / -0

If a ball of 20 gm was brought to rest after covering a distance of 50 m moving at a speed of 50 m/s, what was the magnitude of this applied force?

A
0.05 N

B
25 N

C
0.5 N

D
5 N

E
50 N
Question 4
1 / -0

Which of the following statements are correct?
(a)A force produces acceleration in the body on which it acts.
(b)A force can change the shape and size of an object.
(c)A force can change the total mass of an object.
(d)The S.I unit of force is Dyne.

A
Only (a) and (c)

B
Only (a) and (b)

C
Only (c) and (d)

D
Only (a) and (d)

E
Only (b) and (c)
Question 5
1 / -0

How many dynes are there in force of magnitude 120 N?

A
0.12 x 10⁷ Dyne

B
1.20 x 10⁷ Dyne

C
1.20 x 10⁵ Dyne

D
1.20 x 10⁶ Dyne

E
1.20 x 10⁴ Dyne
Question 6
1 / -0

A person is standing in a bus. When the bus starts moving forward suddenly ___________.

A
The person moves forward

B
The person remains stationary

C
The person is unaffected

D
The person moves backward

E
Both (B) and (D)

Solution

A person standing in a bus moves backward when the bus moves forward. When the bus moves forward, the lower part of his body begins to move along with the bus while the upper part of his body continues to remain at rest due to inertia. That is why a person falls backward when the bus starts.
Hence, the correct option is (D).

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Question 7
1 / -0

Which of the following forces balances a body kept on a table in the state of equilibrium?

A
Force of friction

B
Force of tension

C
Normal reaction force

D
Gravitational force

E
Restoring force
Question 8
1 / -0

Which of the following is correctly matched?
(a)Force: Newton
(b)Momentum: kg ms^-1(c) Acceleration: ms^-1(d)Torque: Joule

A
Both (a) and (b)

B
Both (a) and (c)

C
Both (c) and (d)

D
Both (b) and (d)

E
Both (a) and (d)
Question 9
1 / -0

When we beat a carpet with a stick, then a cloud of dust is observed around it. Which of the following laws clearly explains this phenomenon?

A
Law of conservation of mass

B
Law of inertia

C
Law of conservation of energy

D
Law of conservation of momentum

E
Principle of moments
Question 10
1 / -0

Which of the following is/are known as fundamental law(s) of physics?
(a)Newton's first law of motion
(b)Newton's second law of motion
(c)Newton's third law of motion

A
Only (a)

B
Only (b)

C
Only (c)

D
Both (a) and (b)

E
Both( b) and (c)
Question 11
1 / -0

On what factors does weight of an object depend?
(a) Mass of the object
(b) Size of the object
(c) Height of the object from ground
(d) Gravitational acceleration

A
Both (a) and (b)

B
Both (a) and (c)

C
Both (a) and (d)

D
Both (b) and (c)

E
Both (c) and (d)
Question 12
1 / -0

Energy involved in creating work ______________.

A
Gets used up

B
Gets transferred

C
Gets exhausted

D
Gets lost

E
None of these

Solution

The energy involved in creating work gets transferred or converted into some other kind of energy. Energy can neither be created nor be destroyed. Hence, the energy involved will get converted into some other form of energy. Usually in mechanical work, the energy gets dissipated as heat energy.
Hence, the correct option is (B).

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Question 13
1 / -0

A body is moving along a straight path. What will happen to the body in the absence of an external field?

A
It will stop

B
It will move at the same speed in a different path

C
It will move with the same speed along the same straight path

D
It will move with a reduced speed along the same path

E
None of these

Solution

Galileo stated that on a horizontal plane an object should move with a constant velocity in a straight-line path. Therefore a body moving along a straight path will continue to move in the same direction with the same speed even in the absence of external forces.
Hence, the correct option is (C).

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Question 14
1 / -0

Which physical quantity is defined as rate of change of momentum?

A
Mass

B
Acceleration

C
Force

D
Momentum

E
Centre of gravity
Question 15
1 / -0

Which of the following pairs of forces are non-contact and repulsive in nature?

A
Friction and tension

B
Gravitational forces and normal reaction

C
Electrostatic and magnetic forces

D
Electrostatic and gravitational forces

E
Normal reaction and electrostatic forces

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Re-Attempt Weekly Quiz Competition

Force, Work, Energy and Power Test - 5

Result

Force, Work, Energy and Power Test - 5

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SHARING IS CARING

Question 1

Only (a) and (b)

Only (a) and (c)

Only (b) and (c)

Only (c) and (d)

Only (b) and (d)

Question 2

2.5 x 102 kgm/s

2.5 x 103 kgm/s

2.5 x 104 kgm/s

2.5 x 105 kgm/s

2.5 x 106 kgm/s

Question 3

0.05 N

25 N

0.5 N

5 N

50 N

Question 4

Only (a) and (c)

Only (a) and (b)

Only (c) and (d)

Only (a) and (d)

Only (b) and (c)

Question 5

0.12 x 107 Dyne

1.20 x 107 Dyne

1.20 x 105 Dyne

1.20 x 106 Dyne

1.20 x 104 Dyne

Question 6

The person moves forward

The person remains stationary

The person is unaffected

The person moves backward

Both (B) and (D)

Solution

Question 7

Force of friction

Force of tension

Normal reaction force

Gravitational force

Restoring force

Question 8

Both (a) and (b)

Both (a) and (c)

Both (c) and (d)

Both (b) and (d)

Both (a) and (d)

Question 9

Law of conservation of mass

Law of inertia

Law of conservation of energy

Law of conservation of momentum

Principle of moments

Question 10

Only (a)

Only (b)

Only (c)

Both (a) and (b)

Both( b) and (c)

Question 11

Both (a) and (b)

Both (a) and (c)

Both (a) and (d)

Both (b) and (c)

Both (c) and (d)

Question 12

Gets used up

Gets transferred

Gets exhausted

Gets lost

2.5 x 10² kgm/s

2.5 x 10³ kgm/s

2.5 x 10⁴ kgm/s

2.5 x 10⁵ kgm/s

2.5 x 10⁶ kgm/s

0.12 x 10⁷ Dyne

1.20 x 10⁷ Dyne

1.20 x 10⁵ Dyne

1.20 x 10⁶ Dyne

1.20 x 10⁴ Dyne