Energy Test

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Energy Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

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

A
1960 J

B
980 J

C
990 J

D
1000 J

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 = 1960/2 = 980 J

At this point i.e. half way object has an equal amount of potential and kinetic energy.
Question 2
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 kilogram of water by 1 °C.
Question 3
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 = 1.6×10⁻¹⁹ coulomb × 1 volt = 1.6×10⁻¹⁹J
Question 4
1 / -0

1J=?

A
4.18calorie

B
2.4calorie

C
0.24calorie

D
100calorie

Solution

According to the question the correct option will be ‘C’ because Heat energy is usually measured in calorie. 1calorie is the heat energy required in raising the temperature of 1g of water from 14.5⁰C to 15.5⁰C. It is related to J as 1J=0.24calorie.
Question 5
1 / -0

Unit of energy in S.I. is-

A
Erg

B
N

C
J

D
W

Solution

According to the question the correct option will be ‘C’ because Energy is capacity of doing work. The unit of energy is same as that of work. So, S.I. unit of energy is joule (J).
Question 6
1 / -0

When heated, molecules absorb ____ and their capacity to do ____ increases.

A
Work, energy

B
Energy, work

C
Heat, work

D
Energy, heat

Solution

According to the question the correct option will be ‘B’ because Energy is defined as the capacity to do work.
Question 7
1 / -0

1 kilowatt hour is equal to-

A
10.6× 10⁶Joule

B
3.6 × 10⁶Joule

C
30.6 × 10⁶ Joule

D
3.6 × 10⁵ Joule

Solution

According to the question the correct option will be ‘B’ because the kilowatt hour is a unit of energy equal to 1,000 watt-hours, or 3.6 mega joule. If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the product of the power in kilowatts and the time in hours.

1 kilowatt hour =1000 × 3600joule = 3.6 × 10⁶ J
Question 8
1 / -0

the unit of energy will increases by what If the values of force and length are increased four times -

A
4 times

B
2 times

C
8 times

D
16 times

Solution

According to the question the correct option will be ‘D’ because Force is represented as [MLT⁻²] and length [L]

Energy f × d is [MLT⁻²] × [L] = [ML²T⁻²]

if Force and length are quadrupled in value Energy

4[MLT⁻²] × 4[L] = 16 [ML²T⁻²]

Unit increased by 16 times.
Question 9
1 / -0

The physical quantity electron volt (e V) measure-

A
Charge

B
Force

C
Energy

D
Current

Solution

According to the question the correct option will be ‘C’ because Electron volt or eV is the unit of energy (electrical energy).

1 eV = 1.6 × 10⁻¹⁹ coulombs (charge of an electron) × 1 volt.
Question 10
1 / -0

The value of 1 calorie in joules is-

A
9 joules

B
4.18 joules

C
4.16 joules

D
8 joules

Solution

According to the question the correct option will be ‘B’ because It is a fact that

1 calorie = 4.184 J

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Re-Attempt Weekly Quiz Competition

Energy Test - 2

Result

Energy Test - 2

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SHARING IS CARING

Question 1

1960 J

980 J

990 J

1000 J

Solution

Question 2

1°C

2°C

3°C

4°C

Solution

Question 3

16×10−19J

1.6 × 10−19J

1.6×1019J

1.6×10−19erg

Solution

Question 4

4.18calorie

2.4calorie

0.24calorie

100calorie

Solution

Question 5

Erg

N

J

W

Solution

Question 6

Work, energy

Energy, work

Heat, work

Energy, heat

Solution

Question 7

10.6× 106Joule

3.6 × 106Joule

30.6 × 106 Joule

3.6 × 105 Joule

Solution

Question 8

4 times

2 times

8 times

16 times

Solution

Question 9

Charge

Force

Energy

Current

Solution

Question 10

9 joules

4.18 joules

4.16 joules

8 joules

Solution

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16×10⁻¹⁹J

1.6 × 10⁻¹⁹J

1.6×10¹⁹J

1.6×10⁻¹⁹erg

10.6× 10⁶Joule

3.6 × 10⁶Joule

30.6 × 10⁶ Joule

3.6 × 10⁵ Joule