Energy Test

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Energy Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

The capacity of a body for doing any work is called -

A
Stamina

B
Potentia

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 2
1 / -0

The energy of radio photon (in joule) , when radio transmitter operates on a wavelength of 1500 m at a power of 400 kW.

A
1.32×10⁻²⁴J

B
1.32× 10⁻²⁸ J

C
1.32×10⁻²⁶J

D
1.31×10⁻³²J

Solution

According to the question the correct option will be ‘B’ because Photons are packets of energy (or energy particles) which are emitted by a source of radiation.

According to Planck's quantum theory, a source of radiation emits energy in the form of photons, which travel in straight line.

The energy of photon is

E = hv = hc/λ

Hence, energy of radio photon is

E = 6.6 × 10⁻³⁴ × 2 × 10⁵J

[∵ v = c/λ = 3×10⁸/1500 = 2 × 10⁵Hz] ∴ E = 1.32×10⁻²⁸ J
Question 3
1 / -0

Erg is related to in the form of unit is-

A
Energy

B
Pressure

C
Force

D
Velocity

Solution

According to the question the correct option will be ‘A’ because the erg is a unit of energy and work equal to 10⁻⁷ joules. It originated in the centimeter–gram–second(CGS) system of units. It has the symbol erg. The erg is not an SI unit.
Question 4
1 / -0

A conversion created by running car is-

A
Chemical energy into mechanical energy

B
Mechanical energy into chemical energy

C
Potential energy into kinetic energy

D
No energy

Solution

According to the question the correct option will be ‘A’ because a running car burns fuel and thus moves. So, it converts chemical energy into mechanical energy.
Question 5
1 / -0

A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

A
9 × 10¹⁰ J

B
9 × 10⁸ J

C
9 × 10⁹ J

D
9 × 10⁻⁸ J

Solution

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

1 unit of energy = 1 kWh

1 kWh = 3.6 × 10⁶ J

Thus 250 unit = 250 × 3.6 × 10⁶ J = 9 × 10⁸
Question 6
1 / -0

Lenz’s law is a consequence of the law of conservation of:

A
Charge

B
Energy

C
Induced emf

D
Induced current

Solution

According to the question the correct option will be ‘B’ because Lenz’s law is a consequence of the law of conservation of energy. emf induced is produced to oppose the motion.
Question 7
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which of the following statements is not incorrect?

A
Kinetic energy of a system can be changed without changing the momentum

B
Kinetic energy of a system cannot be changed without changing its momentum

C
Momentum of a system cannot be changed without changing its kinetic energy

D
A system cannot have energy without having momentum

Solution

According to the question the correct option will be ‘A’ because Momentum is a vector quantity while K.E is a scalar quantity, we can change velocity in such a way momentum remains same but K.E changes.
Question 8
1 / -0

1kWh=?

A
3.6×10⁴J

B
3.6×10⁵J

C
36×10⁶J

D
None of these

Solution

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

1kWh = 1kilowatt × 1hour = 1000Js⁻¹ × 3600s = 3.6 × 10⁶J
Question 9
1 / -0

Which physical quantity is measured in calorie?

A
Heat energy

B
Displacement

C
Force

D
Intensity of sound

Solution

According to the question the correct option will be ‘A’ because Heat energy is usually measured in calorie.
Question 10
1 / -0

There is a source of power 1kW in 1h time hence the amount of work done is-

A
1 J

B
1Wh

C
1kWh

D
1calorie

Solution

According to the question the correct option will be ‘C’ because 1kWh is the amount of work done (or, energy spent) by a source of power 1kW in 1h time.

So, 1kW×1h = 1kWh

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Re-Attempt Weekly Quiz Competition

Energy Test - 1

Result

Energy Test - 1

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SHARING IS CARING

Question 1

Stamina

Potentia

Velocity

Energy

Solution

Question 2

1.32×10−24J

1.32× 10−28 J

1.32×10−26J

1.31×10−32J

Solution

Question 3

Energy

Pressure

Force

Velocity

Solution

Question 4

Chemical energy into mechanical energy

Mechanical energy into chemical energy

Potential energy into kinetic energy

No energy

Solution

Question 5

9 × 1010 J

9 × 108 J

9 × 109 J

9 × 10−8 J

Solution

Question 6

Charge

Energy

Induced emf

Induced current

Solution

Question 7

Kinetic energy of a system can be changed without changing the momentum

Kinetic energy of a system cannot be changed without changing its momentum

Momentum of a system cannot be changed without changing its kinetic energy

A system cannot have energy without having momentum

Solution

Question 8

3.6×104J

3.6×105J

36×106J

None of these

Solution

Question 9

Heat energy

Displacement

Force

Intensity of sound

Solution

Question 10

1 J

1Wh

1kWh

1calorie

Solution

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1.32×10⁻²⁴J

1.32× 10⁻²⁸ J

1.32×10⁻²⁶J

1.31×10⁻³²J

9 × 10¹⁰ J

9 × 10⁸ J

9 × 10⁹ J

9 × 10⁻⁸ J

3.6×10⁴J

3.6×10⁵J

36×10⁶J