Electricity Test

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Electricity Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Current in a circuit flows:

A
in direction from high potential to low potential

B
in direction from low potential to high potential

C
in direction of flow of electrons

D
in any direction.

Solution

Electric current flows from positive electrode of cell to negative electrode of cell, i.e., from high potential to low potential.
Question 2
1 / -0

To increase the effective resistance in a circuit the resistors are connected in ______.

A
series

B
parallel

C
both ways

D
none of these

Solution
Question 3
1 / -0

The current which is assumed to be flowing in a circuit from positive terminal to negative, is called:

A
direct current

B
pulsating current

C
conventional current

D
alternating current

Solution

The current flowing from positive terminal to negative terminal is due to flow of positive charge, which is the conventional current.
Question 4
1 / -0

A dynamo develops $$0.5 A$$ at $$6 V$$. The energy which is generated in one second is

A
$$0.083 J$$

B
$$3 J$$

C
$$12 J$$

D
none of these

Solution

Given:
Voltage(V) = $$6V$$
Current(I) = $$0.5A$$
Time(t) = $$1sec$$
Energy generated = $$VIt$$
$$\Rightarrow$$Energy $$= 6\times 0.5 \times 1=3 J$$
Question 5
1 / -0

The device used for producing current is called a _____.

A
Voltmeter

B
Ammeter

C
Galvanometer

D
Generator

Solution

In electricity generation A generator is a device which uses mechanical energy to produce electrical energy which flows in form of electric current in circuits. hence Generator can produce current.
Question 6
1 / -0

The insulator of electricity is :

A
copper

B
silk

C
human body

D
acidulated water

Solution

Silk does not allow electric current to pass through it.
Question 7
1 / -0

An electric lamp is marked $$60\ W,\ 220\ V$$. The cost of kilo watt hour of electricity is $$Rs.\ 1.25$$. The cost of using thing lamp on $$220\ V$$ for $$8\ hrs$$ is:

A
$$Rs.\ 0.25$$

B
$$Rs.\ 0.60$$

C
$$Rs.\ 1.2$$

D
$$Rs.\ 4.00$$

Solution

Given:
Power, $$P=60\ W$$
Time, $$t=8\ hrs$$

Energy consumed per day, $$E=Pt=60\times 8=480\ Whr=\dfrac{480}{1000}=0.48\ kW hr$$
Hence total cost, $$C=0.48\times 1.25=Rs. 0.60 $$
Question 8
1 / -0

1 kilowatt hour $$=$$ ___________ .

A
$$10.6 \times 10^6$$Joule

B
$$3.6 \times 10^6$$Joule

C
$$30.6 \times 10^6$$Joule

D
$$3.6 \times 10^5$$Joule

Solution

$$1\ watt = 3600\ joule$$
$$1\ kW = 1000\ watt$$
$$1\ h=60\times 60 = 3600\ s$$
$$1\ kWh= 1\ kW\times 1\ hour=1000\ W\times 3600\ s = 1000 \times 3600 joule = 3.6 \times 10^{6}\ J$$
Question 9
1 / -0

The unit of current is :

A
ampere

B
volt

C
ohm

D
coulomb

Solution

Current is measured in Coulomb/sec or Ampere.
Question 10
1 / -0

The smallest resistance that can be obtained by the combination of $$n$$ resistors, each of resistance $$R$$ is:

A
$$n^2R$$

B
$$nR$$

C
$$\dfrac{R}{n^2}$$

D
$$\dfrac{R}{n}$$

Solution

For smallest resistance, the resistors are to be connected in parallel. The effective resistance $$= $$ R/n.

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Re-Attempt Weekly Quiz Competition

Electricity Test - 21

Result

Electricity Test - 21

Score

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Rank

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SHARING IS CARING

Question 1

in direction from high potential to low potential

in direction from low potential to high potential

in direction of flow of electrons

in any direction.

Solution

Question 2

series

parallel

both ways

none of these

Solution

Question 3

direct current

pulsating current

conventional current

alternating current

Solution

Question 4

$$0.083 J$$

$$3 J$$

$$12 J$$

none of these

Solution

Question 5

Voltmeter

Ammeter

Galvanometer

Generator

Solution

Question 6

copper

silk

human body

acidulated water

Solution

Question 7

$$Rs.\ 0.25$$

$$Rs.\ 0.60$$

$$Rs.\ 1.2$$

$$Rs.\ 4.00$$

Solution

Question 8

$$10.6 \times 10^6$$Joule

$$3.6 \times 10^6$$Joule

$$30.6 \times 10^6$$Joule

$$3.6 \times 10^5$$Joule

Solution

Question 9

ampere

volt

ohm

coulomb

Solution

Question 10

$$n^2R$$

$$nR$$

$$\dfrac{R}{n^2}$$

$$\dfrac{R}{n}$$

Solution

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Question Analysis

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