Work and Energy Test

Result

Work and Energy Test - 19

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
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

When heated, molecules absorb the $$energy$$, and their capacity to do $$work$$ increases.
Question 2
1 / -0

Power is measured in :

A
joule per second

B
joule per minute

C
joule per square second

D
none of these

Solution

As, Power$$=\dfrac{Energy(J)}{Time(S)}$$
So, Power is measured in joule per second. It is known as $$watt$$.
Question 3
1 / -0

Power spent by a machine depends on:

A
the amount of work done by the machine

B
time taken by the machine to do the work

C
both A and B

D
neither of A and B

Solution

$$Power= \dfrac{Work\quad done}{time \quad taken}$$

Power spent by a machine depends on two factors:
(i) the amount of work done by the machine and
(ii) the time taken by the machine to do the work.
If a machine performs a given amount of work at a faster rate, more power is spent by the machine.
Question 4
1 / -0

If $$1J$$ of work is done in $$1s$$, the power spent is equal to:

A
$$1\ Js$$

B
$$1\ MW$$

C
$$1\ W$$

D
None of these

Solution

If $$1\ J$$ of work is done in $$1\ s$$, the power spent is said to be $$1\ W$$.

$$Power = \dfrac{work}{time}$$

$$\Rightarrow 1\ W=\dfrac{1J}{1s}$$

$$\Rightarrow 1\ W=1{J}{s}^{-1}$$
Question 5
1 / -0

Unit of power is

A
Hp

B
Kilowatt hour

C
Watt

D
None

Solution

The power of the appliance is defined as the rate of consumption of energy by the appliance.
Power,
$$P = \dfrac{Energy}{time}$$
The unit of power is $$Js^{-1}$$ or watt $$(W)$$.
Question 6
1 / -0

Work is expressed by the formula as

A
Work $$=$$ Force (N) $$\times$$ Distance (m)

B
Work $$=$$ Force (g) $$\times$$ Distance (m)

C
Work $$=$$ Force (mg) $$\times$$ Distance (m)

D
Work $$=$$ Force (kg) $$\times$$ Distance (cm)

Solution

Unit of force is Newton (N).
Question 7
1 / -0

For a heater rated at 4.4 KW; 220 V, calculate the energy consumed by the heater in 4 hours?

A
12 KWh

B
17.6 KWh

C
0 KWh

D
4.4 KWh

Solution

Given : $$P = 4.4$$ KW, $$t = 4$$ h
$$\therefore$$ Energy consumed in 4 h
$$\Rightarrow E= P\times t =4.4\times 4 = 17.6$$ kWh
Question 8
1 / -0

One megawatt is equivalent to

A
$$\displaystyle 10^{2}W$$

B
$$\displaystyle 10^{6}W$$

C
$$\displaystyle 10^{4}W$$

D
$$\displaystyle 10^{8}W$$

Solution

Prefix Mega means $$ 10^6 $$.
So, 1 Megawatt = $$1 \times 10^6$$ W
Question 9
1 / -0

1 Megawatt = a
1 Horsepower = b

A
$$\displaystyle a={ 10 }^{ 3 }W,b=1.34W$$

B
$$\displaystyle a={ 10 }^{ 6 }W,b=746W$$

C
$$\displaystyle a={ 10 }^{ 6 }J,b=0W$$

D
$$\displaystyle a={ 10W,b={ 10 }^{ 3 }W }$$

Solution

Mathematically ,1 Megawatt $$ = 10^6$$ W
One horsepower is equal to 746 watt i.e $$1$$ hp $$ = 746$$ W
Question 10
1 / -0

Practical uit of power

A
kw

B
mw

C
gw

D
hp

Solution

Practical unit of power is horsepower $$(hp)$$.
One horsepower is equal to 746 watts.
whereas Watt is the SI unit of power.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Work and Energy Test - 19

Result

Work and Energy Test - 19

Score

-

Rank

-

SHARING IS CARING

Question 1

Work ,energy

Energy ,work

Heat, work

Energy ,heat

Solution

Question 2

joule per second

joule per minute

joule per square second

none of these

Solution

Question 3

the amount of work done by the machine

time taken by the machine to do the work

both A and B

neither of A and B

Solution

Question 4

$$1\ Js$$

$$1\ MW$$

$$1\ W$$

None of these

Solution

Question 5

Hp

Kilowatt hour

Watt

None

Solution

Question 6

Work $$=$$ Force (N) $$\times$$ Distance (m)

Work $$=$$ Force (g) $$\times$$ Distance (m)

Work $$=$$ Force (mg) $$\times$$ Distance (m)

Work $$=$$ Force (kg) $$\times$$ Distance (cm)

Solution

Question 7

12 KWh

17.6 KWh

0 KWh

4.4 KWh

Solution

Question 8

$$\displaystyle 10^{2}W$$

$$\displaystyle 10^{6}W$$

$$\displaystyle 10^{4}W$$

$$\displaystyle 10^{8}W$$

Solution

Question 9

$$\displaystyle a={ 10 }^{ 3 }W,b=1.34W$$

$$\displaystyle a={ 10 }^{ 6 }W,b=746W$$

$$\displaystyle a={ 10 }^{ 6 }J,b=0W$$

$$\displaystyle a={ 10W,b={ 10 }^{ 3 }W }$$

Solution

Question 10

kw

mw

gw

hp

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.