Electrical Power and Household Circuits Test

Result

Electrical Power and Household Circuits Test - 3

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Question 1
1 / -0

A hairstylist uses a hairdryer of 750 watt for 25 minutes everyday. Find the cost to use it everyday for one year at the rate of Rs. 6.5 per Kwh.

A
Rs. 590 approx.

B
Rs. 740 approx.

C
Rs. 170 approx.

D
Rs. 1010 approx.
Question 2
1 / -0

Which of the following conditions is correct when power is transferred from one station to another?

A
High current and energy gain

B
High resistance and energy gain

C
Low current and energy loss

D
Low voltage and energy gain
Question 3
1 / -0

Which of the following statements is NOT correct for switch off position of a switch connected in live wire?

A
No current flows through the appliance.

B
It is safe to carry out repairs.

C
The appliance does not remain connected to high potential terminal through live wire.

D
Both live wire and neutral wire connected with appliances are at zero potential.
Question 4
1 / -0

Which of the following relationships is not true?

Where, W = Work done in joules
Q = Electric charge in coulombs
V = Potential difference in volts
I = Current in amperes
R = Resistance in ohms
t = Time

A
W = QV

B
W = I²Rt

C
W = VIt

D
W =
Question 5
1 / -0

Which of the following systems are used in house wiring?
(A) Tree system
(B) Branch system
(C) Stem system
(D) Ring system

A
(A) and (B)

B
(B) and (D)

C
(A) and (D)

D
(A), (B) and (D)
Question 6
1 / -0

Which of the following should a fuse wire have, used for household supply of electricity for safety purpose?

A
High resistance

B
High melting point

C
Low melting point

D
Low specific heat
Question 7
1 / -0

A pole fuse is

A
a fuse of low rating

B
connected in neutral wire at the pole

C
connected directly to the appliance

D
connected before the electric line is connected
Question 8
1 / -0

What should be the colour of live wire while wiring a plug?

A
Red

B
Brown

C
Black

D
Green
Question 9
1 / -0

Why are the electrical appliances used for household earthed?

A
Because the earth wire provides a low-resistance path for electricity to flow in an event of fault

B
Because the earth wire provides an alternative for electricity to flow if the neutral wire is not connected

C
Because the earth wire does not allow any current to pass through it

D
Because the earth wire provides a high-resistance path for electricity to flow in an event of fault
Question 10
1 / -0

Which of the following materials is used to make live wires?

A
Platinum only

B
Copper only

C
Tungsten

D
Steel
Question 11
1 / -0

A current in a lamp fixed on a wall is rated at 4 A. What should be the best fuse to use in the plug of lamp?

A
3 A fuse

B
0 A fuse

C
4 A fuse

D
5 A fuse
Question 12
1 / -0

What happens to resistance of an appliance if voltage rating is doubled and power rating is four times?

A
The resistance doubles.

B
The resistance becomes four times.

C
The resistance becomes half.

D
The resistance remains the same.
Question 13
1 / -0

Two coils of resistances R₁ = 6 and R₂ = 10 are connected in series across a battery of potential difference 12 V. Find the total energy supplied by battery in 90 seconds.

A
530 J

B
810 J

C
260 J

D
1000 J
Question 14
1 / -0

In which wire of an appliance should a fuse be connected so that a person may not get a shock?

A
Live wire

B
Neutral wire

C
Earth wire

D
Any of these
Question 15
1 / -0

Which of the following statements is not correct?

A
The switch used to switch on or off the mains is double pole switch.

B
The switch used with an appliance to start or stop the flow of current in it, is single pole switch.

C
A single pole switch disconnects the live wire.

D
A double pole switch connects live and neutral wires.
Question 16
1 / -0

Which of the following statements is not correct for high tension wires?

A
It is used for high voltage and heavy current.

B
It has large surface area.

C
It has high resistance.

D
It radiates more heat that is produced.
Question 17
1 / -0

Which of the following statements is not correct for MCB?

A
When short circuit happens they switch off circuit in very short time duration.

B
They cause heavy current to flow in the time.

C
They are not used for individual circuits.

D
They are better than a fuse.
Question 18
1 / -0

Why the top pin in a three - pin plug is kept thick and big as compared to other two pins?

A
Because connection with neutral wire is made first for safety of user.

B
Because earth wire connection is made first for safety of user.

C
Because connection with the circuit is made first for safety of user.

D
Because live wire connection is made first for safety of user.
Question 19
1 / -0

Which of the following is not an advantage of ring system?

A
In ring system, current can travel to an individual appliance through two separate paths.

B
In ring system, only different sizes of plugs and sockets are used for different current carrying capacities.

C
While installing a new appliance in a room, a new line up to the distribution box is not required.

D
The cost of wiring is reduced considerably.

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Re-Attempt Weekly Quiz Competition

Electrical Power and Household Circuits Test - 3

Result

Electrical Power and Household Circuits Test - 3

Score

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Rank

-

SHARING IS CARING

Question 1

Rs. 590 approx.

Rs. 740 approx.

Rs. 170 approx.

Rs. 1010 approx.

Question 2

High current and energy gain

High resistance and energy gain

Low current and energy loss

Low voltage and energy gain

Question 3

No current flows through the appliance.

It is safe to carry out repairs.

The appliance does not remain connected to high potential terminal through live wire.

Both live wire and neutral wire connected with appliances are at zero potential.

Question 4

W = QV

W = I2Rt

W = VIt

W =

Question 5

(A) and (B)

(B) and (D)

(A) and (D)

(A), (B) and (D)

Question 6

High resistance

High melting point

Low melting point

Low specific heat

Question 7

a fuse of low rating

connected in neutral wire at the pole

connected directly to the appliance

connected before the electric line is connected

Question 8

Red

Brown

Black

Green

Question 9

Because the earth wire provides a low-resistance path for electricity to flow in an event of fault

Because the earth wire provides an alternative for electricity to flow if the neutral wire is not connected

Because the earth wire does not allow any current to pass through it

Because the earth wire provides a high-resistance path for electricity to flow in an event of fault

Question 10

Platinum only

Copper only

Tungsten

Steel

Question 11

3 A fuse

0 A fuse

4 A fuse

5 A fuse

Question 12

The resistance doubles.

The resistance becomes four times.

The resistance becomes half.

The resistance remains the same.

Question 13

530 J

810 J

260 J

1000 J

Question 14

Live wire

Neutral wire

Earth wire

Any of these

Question 15

The switch used to switch on or off the mains is double pole switch.

W = I²Rt