Work and Energy Test

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Work and Energy Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Calculate the time taken by a 150 w bulb of consuming 3000 joule of energy.

A
25 s

B
20s

C
40 s

D
30 s

Solution

Explanation:

Power of bulb = 150w, work done = 3000 joule, time taken= work done/power = 3000/150 = 20 s.
Question 2
1 / -0

A machine does 2000 joule of work in 400 seconds. What is the power of machine?

A
20w

B
5w

C
6w

D
0.5w

Solution

Explanation:

Power = work done / time taken, here, work done = 2000 joule, time = 400 s. power = 2000j/400s = 5 j/s or 5w.
Question 3
1 / -0

Work done by centripetal force is

A
≥0

B
>0

C
<0

D
0

Solution

Explanation:

When a body moves on a circular path. The force that acts on the revolving body towards the center is called centripetal force. As the force acts as right angle to the direction of motion, so work done is 0.
Question 4
1 / -0

For what value of ϕ. is work done maximum?

A
45⁰

B
0⁰

C
90⁰

D
60⁰

Solution

Explanation:

Work done when a body moves at an angle to the direction of force is W=Fcosϕ×s. The value of Cos is maximum for 00. So, work done will be maximum for this angel.
Question 5
1 / -0

1 meV (mega electron volt) is equal to

A
1.6 ×10⁻¹⁹J

B
1.6 × 10¹⁹J

C
1.6 × 10⁻¹³J

D
1.6 × 10¹³J

Solution

Explanation:
Electron volt is an unit of energy. One electron volt is equal to 1.6×10⁻¹⁹

joule. One mega electron = 1.6×10⁻¹⁹joule × 100000 = 1.6×10−¹³joule.
Question 6
1 / -0

9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of

A
20m

B
10m

C
980m

D
none of these

Solution

Explanation:

Potential energy = mgh, here, P.E = 9800 j. mass = 50kg, g=9.8m/s².

Therefore, 9800=50×9.8×h, h= 9800/50×9.8 = 20m.
Question 7
1 / -0

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

A
9 ×10⁸J

B
9 ×10⁶J

C
10 × 10⁵Joule

D
5 × 10⁸ Joule

Solution

Explanation:

1 unit (Kw-H) = 3.6×10⁶ joule. Therefore, 250 units = 250×3.6×10⁶joule = 9×10⁸ Joule.
Question 8
1 / -0

1 W. S = ________?

A
2 joule

B
10 joule

C
3.6 × 10⁶ joule

D
1 joule

Solution

Explanation:

1 watt second (W.S) = 1J/s × s = 1 joule.
Question 9
1 / -0

1k w h =?

A
36 × 10⁶J

B
3.06 × 10⁴J

C
3.6 × 10⁶J

D
4.2J

Solution

Explanation:

1 kwH = 1000 W×60×60 s 1000 W×60×60 s = 3600000J = 3.6 × 10⁶J. one watt is equal to one joule per second.

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 1

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Work and Energy Test - 1

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Question 1

25 s

20s

40 s

30 s

Solution

Question 2

20w

5w

6w

0.5w

Solution

Question 3

≥0

>0

<0

0

Solution

Question 4

450

00

900

600

Solution

Question 5

1.6 ×10−19J

1.6 × 1019J

1.6 × 10−13J

1.6 × 1013J

Solution

Question 6

20m

10m

980m

none of these

Solution

Question 7

9 ×108J

9 ×106J

10 × 105Joule

5 × 108 Joule

Solution

Question 8

2 joule

10 joule

3.6 × 106 joule

1 joule

Solution

Question 9

36 × 106J

3.06 × 104J

3.6 × 106J

4.2J

Solution

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45⁰

0⁰

90⁰

60⁰

1.6 ×10⁻¹⁹J

1.6 × 10¹⁹J

1.6 × 10⁻¹³J

1.6 × 10¹³J

9 ×10⁸J

9 ×10⁶J

10 × 10⁵Joule

5 × 10⁸ Joule

3.6 × 10⁶ joule

36 × 10⁶J

3.06 × 10⁴J

3.6 × 10⁶J