Energy Test

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Energy Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The capacity of a body for doing any work iscalled -

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 tothe 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 emittedby 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 = $\frac{c}{λ}$ = $\frac{3 \times 10^{8}}{1500}$ = 2 × 10⁵Hz]∴ E =1.32×10⁻²⁸ J
Question 3
1 / -0

Ergis related to in the form of unit is-

A
Energy

B
Pressure

C
Force

D
Velocity

Solution

Accordingto the question the correct option will be ‘A’ because the erg is a unit ofenergy 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

Accordingto the question the correct option will be ‘A’ because a running car burns fueland 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 × 10¹⁰J

B
9 ×10⁸ J

C
9 × 10⁹J

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’slaw is a consequence of the law of conservation of:

A
Charge

B
Energy

C
Inducedemf

D
Inducedcurrent

Solution

Accordingto the question the correct option will be ‘B’ because Lenz’s law is aconsequence of the law of conservation of energy. emf induced is produced tooppose the motion.
Question 7
1 / -0

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
Noneof these

Solution

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

1kWh = 1kilowatt × 1hour = 1000Js⁻¹ × 3600s = 3.6 × 10⁶J
So, none of option A, B and C are correct.
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
Question 11
1 / -0

An object is raised to a height of 5m above ground of mass 40 kg .If the object is allowed to fall down then findits kinetic energy when it is half-way down.

A
1960J

B
980J

C
990J

D
1000J

Solution

According to the question the correct option will be ‘B’because Gravitational Potential energy, W = mgh
h = vertical displacement = 5 m
m = Mass of object = 40 Kg
g = Acceleration due to gravity = 9.8 ms⁻²
W = 40 × 5 × 9.8 = 1960 J
For half way down = $\frac{1960}{2}$ = 980 J
At this point i.e. half way object has an equalamount of potential and kinetic energy.
Question 12
1 / -0

One kilo-calorie of heat is equal to-

A
1°C

B
2°C

C
3°C

D
4°C

Solution

According to the question the correct option will be ‘A’ because One kilo-calorie is defined as the amount of heat required to raise the temperature of one kilo gram of water by 1 °C.
Question 13
1 / -0

1eV = ??

A
16×10⁻¹⁹J

B
1.6× 10⁻¹⁹J

C
1.6×10¹⁹J

D
1.6×10⁻¹⁹erg

Solution

According to the question the correct option will be ‘B’ because 1eV is the energy gained by an electron when it is accelerated through a potential difference of 1 volt.
So, 1eV = charge of an electron × 1 volt = 1.6×10⁻¹⁹coulomb × 1 volt = 1.6×10⁻¹⁹J
Question 14
1 / -0

1J=?

A
4.18calorie

B
2.4calorie

C
0.24calorie

D
100calorie

Solution

Accordingto the question the correct option will be ‘C’ because Heat energy is usuallymeasured in calorie. 1calorie is the heat energy required in raising thetemperature of 1g of water from 14.5⁰C to 15.5⁰C. It isrelated to J as 1J=0.24calorie.
Question 15
1 / -0

Unit of energy in S.I. is-

A
Erg

B
N

C
J

D
W

Solution

Accordingto the question the correct option will be ‘C’ because Energy is capacity ofdoing work. The unit of energy is same as that of work. So, S.I. unit of energyis joule (J).

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Re-Attempt Weekly Quiz Competition

Energy Test - 5

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Energy Test - 5

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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 × 1010J

9 ×108 J

9 × 109J

9 ×10−8 J

Solution

Question 6

Charge

Energy

Inducedemf

Inducedcurrent

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

Noneof these

Solution

Question 9

Heat energy

Displacement

Force

Intensity of sound

Solution

Question 10

1 J

1Wh

1kWh

1calorie

Solution

Question 11

1960J

980J

990J

1000J

Solution

Question 12

1°C

2°C

3°C

4°C

Solution

1.32×10⁻²⁴J

1.32×10⁻²⁸ J

1.32×10⁻²⁶J

1.31×10⁻³²J

9 × 10¹⁰J

9 ×10⁸ J

9 × 10⁹J

9 ×10⁻⁸ J

3.6×10⁴J

3.6×10⁵J

36×10⁶J

16×10⁻¹⁹J

1.6× 10⁻¹⁹J

1.6×10¹⁹J

1.6×10⁻¹⁹erg