Work and Energy Test

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Work and Energy Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The amount of work done when a force of one dyne acting in an object displaces it through a distance of one centimeter along its own direction is known as

A
one erg

B
one volt

C
one ampere

D
one newton

Solution

The basic unit of energy or work in the CGS system, equal to the amount of work done by a force of one dyne acting through a distance of one centimeter .
Question 2
1 / -0

Which provides more energy to human body after digestion?

A
1kg of rice

B
1kg of butter

C
1kg of potatoes

D
1kg of salad

Solution

Calorific value of butter is higher than potato, rice and salad. So, one kg of butter provides more energy to human body after digestion in comparison to 1 kg of rice, potatoes and salad.
Question 3
1 / -0

Statement A: If two bodies have same K. E, then their momentum will also be equal
Statement B: Work done by centripetal force is always greater than zero.

A
neither statement A nor statement B is true.

B
statement B is true, A is false

C
statement A is true, B is false

D
both the statement A and B are true

Solution

(A) Two bodies having equal kinetic energy may or may not have equal momentum.
(B) The work done by a centripetal force is always zero.

So, statement A and B both are not true statement .

Question 4

1 / -0

Match the following with correct response.

Column A	Column B
(1) Kinetic energy	(A) Energy due to position
(2) Potential energy	(B) The rate of doing work
(3) Work	(C) Force displaces an object in the direction of force
(4) Power	(D) Energy due to motion

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

(1) Kinetic energy is the energy of motion. KE = 1/2 mv²
(2) Energy possessed by an object because of its position is called potential energy.
(3) Work is defined as a force acting upon an object to cause a displacement .
(4) Rate of doing work is called power.

Question 5

1 / -0

Match the following with correct response.

Column A	Column B
(1) Velocity effects	(A) Energy
(2) Maximum work done	(B) 90^∘
(3) Work done is zero	(C) O^∘
(4) Work done, when force act obliquely	(D) F × S × cosθ

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

Solution

(1) As the velocity of object increases it's Kinetic energy also increases.
(2) W= F x S cos θ ( cos 0⁰ = 1) So, w = F x S means maximum work is done.
(3) W= F x S cos θ ( cos 90⁰ = 0) So, w = 0 means zero work is done.
(4) W= F x S cos θ where F = force, d = displacement

Question 6

1 / -0

Match the following with correct response.

Column A	Column B
(1) Law of conservation of energy	(A) kinetic energy
(2) Stretched rubber band possess	(B) Energy neither be created nor be destroyed
(3) At mean position pendulum attains maximum	(C) Interconvertible
(4) Various energy forms are	(D) Potential energy

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

(1) Law of conservation of energy is stated as energy neither be created nor be destroyed but it converted into one form to another form.
(2) Stretched rubber band possess potential energy.
(3) At mean position pendulum attains maximum kinetic energy.
(4) Various energy forms are Inter convertible.

Question 7
1 / -0

Match the following with correct response.

(1) Nm is also called
(2) Free fall
(3) A donkey is working with a load on its back
(4) An engine is pulling train

(A) Potential energy is equal tokinetic energy
(B) Work done
(C) No work done
(D) Erg

A
1-A, 2-C, 3-B, 4-D

B
1-C, 2-B, 3-D, 4-A

C
1-B, 2-D, 3-A, 4-C

D
1-D, 2-A, 3-C, 4-B

Solution

(1) Nm is also called Erg.
(2) In free fall potential energy is equal to kinetic energy.
(3) A donkey is carrying a load on its back, the force of gravity on the load is in the downward direction, whereas the displacement is in the horizontal direction, i.e., the force and the displacement are perpendicular to each other. There is no displacement in the direction of the force of gravity, and therefore, work done is zero.
(4) An engine pulling a train on a railway line is said to be doing work.
Question 8
1 / -0

Which of the following statement are incorrect

(A) A bird sitting on tree possess potential energy only
(B) A stationary object may have energy
(C) A flying bird has kinetic energy only
(D) An aeroplane running on the run- way possess kinetic & potential energy both

A
(a), (b), (c) and (d)

B
(a), (b) and (c)

C
(b) and (c)

D
(c) and (d)

Solution

(a) A bird sitting on tree possess potential energy only is correct statement.
(b) A stationary object may have energy is correct statement.
(c) A flying bird has kinetic energy only this is incorrect statement because A flying bird has kinetic energy as well as positional energy also.
(d) An aeroplane running on the run- way possess kinetic energy only. So given statement is incorrect.
Question 9
1 / -0

Which of the following is not a vector quantity

A Energy
B Kinetic energy
C Work done
D Power

A
(b) and (c) are correct

B
(a) and (b) are correct

C
(a), (b) and (c) are correct

D
Both A, B , C and D

Solution

Power = work done per unit time. Since work is a scalar quantity, power is also a scalar quantity.
Energy is a scalar. This is because energy is defined as the scalar product of force(F) and displacement (S).
Work is a scalar quantity, i.e. work has only magnitude but no direction.
Kinetic energy is a scalar because it is defined to be a scalar.
So, energy , Kinetic energy ,work done and power all are scalar quantity.

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Work and Energy Test - 10

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Work and Energy Test - 10

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Question 1

one erg

one volt

one ampere

one newton

Solution

Question 2

1kg of rice

1kg of butter

1kg of potatoes

1kg of salad

Solution

Question 3

neither statement A nor statement B is true.

statement B is true, A is false

statement A is true, B is false

both the statement A and B are true

Solution

Question 4

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

Question 5

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

Solution

Question 6

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

Solution

Question 7

1-A, 2-C, 3-B, 4-D

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

Solution

Question 8

(a), (b), (c) and (d)

(a), (b) and (c)

(b) and (c)

(c) and (d)

Solution

Question 9

(b) and (c) are correct

(a) and (b) are correct

(a), (b) and (c) are correct

Both A, B , C and D

Solution

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