Energy Test

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Energy Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

In bringing a charge of 10 milli coulombs from infinity to a point at which potential is 12v, work done is-

A
1.2 J

B
0.12 J

C
0 J

D
120 J

Solution

According to the question the correct option will be ‘B’ because

W = QV

= (10 × 10⁻³)(12V)

= 12 × 10−2 J

= 0.12 J
Question 2
1 / -0

A pendulum rocks back and forth. In an ideal setting, this motion would go on perpetually without loss of mechanical energy. Realistically, if you held a pendulum up and made it go in motion, it would slow to a stop.

What is responsible for the pendulum gradually losing mechanical energy? Ignore the mass of the string holding the pendulum bob in motion.

A
The work done by gravity

B
The work done by tension

C
The work done by air resistance

D
The pendulum does not lose mechanical energy

Solution

According to the question the correct option will be ‘C’ because the vibrations of the pendulum die after some time, it is because of the frictional force of air which opposes the motion of bob .So air resistance is responsible for the loss in mechanical energy.
Question 3
1 / -0

In an electric motor, the conversion of energy that takes place is:

A
chemical energy into electrical energy

B
electrical energy into mechanical energy

C
electrical energy into light

D
electrical energy into chemical energy

Solution

B. electrical energy into mechanical energy.

An electric motor converts electrical energy into mechanical energy through the process of electromagnetic induction.
Question 4
1 / -0

A battery, left idle is-

A
Converts chemical energy into electrical energy

B
Converts electrical energy into chemical energy

C
Converts electrical energy into light energy

D
Does no energy conversions

Solution

According to the question, the correct option will be ‘D’ because when a battery is not in use, it does not give out electric current. So, the chemical energy stored in it does not get converted.
Question 5
1 / -0

Which of the following statement is not correct?

A
State of rest of a body is same as the state of zero speed

B
Human body converts chemical energy into muscular energy

C
Water in river flows down due to its kinetic energy

D
Liquids exert pressure on the walls of the container

Solution

According to the question the correct option will be ‘C’ because Option C is not correct because river flows down due to its gravitational potential energy.
Question 6
1 / -0

The capacity of a body is called ______ .

A
Stamina

B
Potential

C
Velocity

D
Energy

Solution

According to the question the correct option will be ‘D’ because Energy is the capacity of a physical system to perform work. Energy exists in several forms such as heat energy, kinetic or mechanical energy, light energy, potential energy, electrical energy, or other forms. According to the law of conservation of energy the total energy of a system remains constant, though energy may transform into another form.

The SI unit of energy is the joule (J) or newton-meter (N-m). Joule is also the SI unit of work.
Question 7
1 / -0

Energy is-

A
The capacity to do work

B
Work done in unit time

C
A push or a pull

D
Attraction between two oppositely charged particles

Solution

According to the question the correct option will be ‘A’ because Energy is the capacity of a physical system to perform work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, electrical, or other forms.
Question 8
1 / -0

A ball is placed on a compressed spring. On releasing the spring, the ball flies away. Then which of the following is not incorrect?

A
The ball creates its own kinetic energy

B
Elastic potential energy of the spring is destroyed and kinetic energy of the ball is created

C
Potential energy of the ball is destroyed and kinetic energy of the spring is created

D
Elastic potential energy of the spring gets converted into kinetic energy of the ball

Solution

According to the question the correct option will be ‘D’ because Work is done on the spring to compress it. This work is stored in the spring in the form of its elastic potential energy. When the spring is released, its elastic potential energy gets transformed into the kinetic energy of the ball and the ball flies away.
Question 9
1 / -0

Conversion by electric heater is-

A
Electric energy into chemical energy

B
Chemical energy into electric energy

C
Heat energy into electric energy

D
Electric energy into heat energy

Solution

According to the question the correct option will be ‘D’ because An electric heater is an electrical device that converts electric current to heat. The heating element inside every electric heater is an electrical resistor, and works on the principle of Joule heating: an electric current passing through a resistor will convert that electrical energy into heat energy.
Question 10
1 / -0

Water falls from a height 500 m. What will be the rise in temperature of water at bottom if whole energy remains in the water?

A
0.96°C

B
1.02°C

C
1.16°C

D
0.23°C

Solution

According to the question the correct option will be ‘C’ because

Water is at height (h) = 500m.

Potential energy =mgh

= 1 × 9.81 × 500

= 4905J/liter

Specific heat of water = 4180J/kgk

So, E=mcΔT.

4905= 1 × 4180 × ΔT

ΔT= 4905/4180

ΔT= 1.16^oC.

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Re-Attempt Weekly Quiz Competition

Energy Test - 4

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Energy Test - 4

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SHARING IS CARING

Question 1

1.2 J

0.12 J

0 J

120 J

Solution

Question 2

The work done by gravity

The work done by tension

The work done by air resistance

The pendulum does not lose mechanical energy

Solution

Question 3

chemical energy into electrical energy

electrical energy into mechanical energy

electrical energy into light

electrical energy into chemical energy

Solution

Question 4

Converts chemical energy into electrical energy

Converts electrical energy into chemical energy

Converts electrical energy into light energy

Does no energy conversions

Solution

Question 5

State of rest of a body is same as the state of zero speed

Human body converts chemical energy into muscular energy

Water in river flows down due to its kinetic energy

Liquids exert pressure on the walls of the container

Solution

Question 6

Stamina

Potential

Velocity

Energy

Solution

Question 7

The capacity to do work

Work done in unit time

A push or a pull

Attraction between two oppositely charged particles

Solution

Question 8

The ball creates its own kinetic energy

Elastic potential energy of the spring is destroyed and kinetic energy of the ball is created

Potential energy of the ball is destroyed and kinetic energy of the spring is created

Elastic potential energy of the spring gets converted into kinetic energy of the ball

Solution

Question 9

Electric energy into chemical energy

Chemical energy into electric energy

Heat energy into electric energy

Electric energy into heat energy

Solution

Question 10

0.96°C

1.02°C

1.16°C

0.23°C

Solution

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