Electricity Test

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Electricity Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

When a constant current is applied for a time of t seconds, how can you increase the heat produced to four times?

A
By increasing the potential difference to four times.

B
By increasing resistance to four times.

C
By decreasing the potential difference to one fourth.

D
By decreasing resistance to one-fourth.

Solution

According to Joule's law of heating, the heat produced in a resistor is directly proportional to the square of the current for a given resistance, directly proportional to the resistance for a given current and directly proportional to the time for which the current flows through the resistor. H = I²Rt

When a constant current 'I' is applied for a time of 't' seconds, the heat produced can be increased to four times by increasing the resistance to four times the original value. H₁ = I²Rt ; H₂ = I²(4R)t ; H₂= 4H₁
Question 2
1 / -0

A 200 W bulb is lighted for two hours. How much energy is consumed?

A
4 kWh

B
0.4 kWh

C
0.8 kWh

D
1 kWh

Solution

Energy consumed E = P (in kW) x t (in hours) = 0.2 x 2 = 0.4 kWh
Question 3
1 / -0

Statement A : Light from a bathroom bulb gets dimmer for a moment, when the geyser is switched on.

Statement B : Insulators conduct charges, they can be charged easily by friction.

A
Neither statement A nor statement B is true.

B
Both the statements A and B are true.

C
Statement B is true; Statement A is false.

D
Statement A is true; Statement B is false.

Solution

Light from a bathroom bulb gets dimmer for a moment, when the geyser is switched on. A geyser has a higher power rating and draws a large current from the mains when it is switched on.

Insulators do not conduct charges; they have high resistivity.
Question 4
1 / -0

When an electric current is passed through a metallic wire, the particles moving are:

A
Ions

B
Electrons

C
Atoms

D
Protons

Solution

Electric current is the rate of flow of electric charges. Movement of free electrons inside a metallic wire constitutes a flow of charge. Conventionally, in an electric circuit, the direction of electric current is taken as opposite to the direction of flow of electrons.
Question 5
1 / -0

Which of the following does not have plus (+) or minus (-) signs marked on it?

A
Battery

B
Ammeter

C
Resistor

D
Voltmeter

Solution

A resistor does not have plus (+) or minus (-) signs marked on it. Ammeter, Voltmeter and a battery have polarities marked on them.
Question 6
1 / -0

By considering their position in the periodic table which one of the following elements would you expect to have maximum metallic characteristic?

A
Ge

B
As

C
Be

D
Ga

Solution

It is placed on the extreme left of the periodic table where the metallic character of elements is maximum.
Question 7
1 / -0

What will happen to current passing though a resistor if the potential difference across its ends is doubled and the resistance is halved?

A
Becomes one-fourth

B
Becomes half

C
Becomes four times

D
Remain unchanged

Solution

According to Ohm's law, the current (I) flowing through conductor is directly proportional to the potential difference (V) applied across the ends of the conductor.

I=V/R where R is the resistance of the conductor.

When the potential difference across the ends of a resistor is doubled and the resistance is halved, the current flowing through the resistor becomes four times of the original value.
Question 8
1 / -0

Three resistors are connected in series with the current in each resistor as 1.5 A. The current drawn will be:

A
1.5 A

B
4.5 A

C
1.0 A

D
3 A

Solution

In a series combination of resistors, the same current flows through each resistor. When three resistors are connected in series, the current will be the same in every part of the circuit. The total current drawn by the circuit will be the same as the current drawn by each resistor i.e. 1.5 A.

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Electricity Test - 12

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Electricity Test - 12

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Question 1

By increasing the potential difference to four times.

By increasing resistance to four times.

By decreasing the potential difference to one fourth.

By decreasing resistance to one-fourth.

Solution

Question 2

4 kWh

0.4 kWh

0.8 kWh

1 kWh

Solution

Question 3

Neither statement A nor statement B is true.

Both the statements A and B are true.

Statement B is true; Statement A is false.

Statement A is true; Statement B is false.

Solution

Question 4

Ions

Electrons

Atoms

Protons

Solution

Question 5

Battery

Ammeter

Resistor

Voltmeter

Solution

Question 6

Ge

As

Be

Ga

Solution

Question 7

Becomes one-fourth

Becomes half

Becomes four times

Remain unchanged

Solution

Question 8

1.5 A

4.5 A

1.0 A

3 A

Solution

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