Electricity Test

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Electricity Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Electricians wear rubber gloves because:

A
it is soft

B
it is water proof

C
it is an insulator

D
it is inexpensive

Solution

Rubber is an insulator and does not allow the passage of electric current through it, so when electricians wear rubber gloves electric current cannot pass through them, so they don't get electric shock.
Question 2
1 / -0

An electric heater is rated $$1500 \ W$$. How much energy does it use in $$10 \ hours$$ ?

A
$$25 \: kWh$$

B
$$10 \: kWh$$

C
$$15 \: kWh$$

D
$$12 \: kWh$$

Solution

Correction option: C
Hint: Energy consumed = Power × Time

Explanation for correct option:

Step 1: Find the energy consumes by the electric heater.

Power rating of the heater (P) = 1500

P= 1.5 kW = 1500 W

Time for which the heater has operated (T) = 10 h

Work done = Energy consumed by the heater

∴ Energy consumed = Power × Time

Energy consumed = 1500 × 10

Energy consumed = 15000 W

Hence, the energy consumed by the heater in $$\bf{10 h}$$ is $$\bf{15 kWh}$$.
Question 3
1 / -0

A material that lets electricity to pass through it is called a/an:

A
electrical conductor

B
electrical insulator

C
electrical appliance

D
key

Solution

A material that lets electricity to pass through it is called an electrical conductor.
Question 4
1 / -0

When a 1 ohm resistor is connected across the potential difference of 20 V, what will be power dissipation in it?

A
$$200 W$$

B
$$20 W$$

C
$$400 W$$

D
$$10 W$$

Solution

Given : $$V = 20$$ volts $$R =1\Omega$$
Power dissipated in it $$P =\dfrac{V^2}{R} = \dfrac{20^2}{1} = 400$$ W
Question 5
1 / -0

Fill in the blank.
Connecting wires in a electric circuit are made of .......

A
copper

B
silicon

C
tin

D
lead

Solution

Copper and aluminium offer a low resistance to the flow of current and hence they are good conductors of electricity. Copper and aluminium are highly ductile and hence can be used for preparing the wire. Copper being more ductile, it is used in making thin wires, and aluminium is used for making thicker wires. Thus, they are suitable for making wires used in electrical circuit.
Hence, the statement is true.
Question 6
1 / -0

Find the energy in $$kWh$$ consumed in $$10$$ hours by four devices of power $$500\ W$$ each.

A
$$30 \:kWh$$

B
$$25 \:kWh$$

C
$$20 \:kWh$$

D
$$35 \:kWh$$

Solution

Hint: Calculate the energy consumed by each device.

Correct answer is an option (C).

Step 1: Calculate energy consumed by each device
The power of each device is $$500W$$.
The time for which each device is used is $$10hr$$
Energy consumed by each device $$=500\times 10$$=$$5000Wh$$
= $$5kWh$$

Step 2: Calculate energy consumed by four devices.
Energy consumed by one device $$=5kWh$$
Energy consumed by four devices $$=5\times 4$$
$$=20kWh$$

Hence, the energy consumed by four devices in $$kWh$$ is $$20kWh$$.
The correct answer is an option (C).
Question 7
1 / -0

A material that does not allow electricity to flow through it is called a/an:

A
Electrical conductor

B
Electrical insulator

C
Electrical appliance

D
Key

Solution

An electrical insulator is a material whose internal electric charges do not flow freely and therefore make it very hard to conduct an electric current under the influence of an electric field.
Question 8
1 / -0

Metals are good conductors because:

A
outer electrons are strongly bound to the atom

B
outer electrons are loosely bound to the atom

C
inner electrons are loosely bound to the atom

D
protons can detach from the nucleus and conduct electricity

Solution

Metals are good conductors because, in metal atoms, outer electrons are loosely bound to the atoms. Due to which these electrons (charge carriers) are free to move, and a metal thus has a large number of charge carriers.
Question 9
1 / -0

Insulators:

A
Conduct electricity

B
Do not conduct electricity

C
Conduct electricity only at low temperatures

D
Conduct electricity at room temperature

Solution

$$\textbf{Correct option: Option (B).}$$

$$\textbf{Explanation:}$$

Insulators have tightly bound electrons which cannot move freely and hence cannot conduct electricity.

$$\textbf{Thus, option (B) is correct.}$$
Question 10
1 / -0

A body which cannot conduct electricity is

A
an insulator

B
a conductor

C
can be an insulator or conductor

D
none of these

Solution

Answer is A.

An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it very hard to conduct an electric current under the influence of an electric field.

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Re-Attempt Weekly Quiz Competition

Electricity Test - 22

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Electricity Test - 22

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SHARING IS CARING

Question 1

it is soft

it is water proof

it is an insulator

it is inexpensive

Solution

Question 2

$$25 \: kWh$$

$$10 \: kWh$$

$$15 \: kWh$$

$$12 \: kWh$$

Solution

Question 3

electrical conductor

electrical insulator

electrical appliance

key

Solution

Question 4

$$200 W$$

$$20 W$$

$$400 W$$

$$10 W$$

Solution

Question 5

copper

silicon

tin

lead

Solution

Question 6

$$30 \:kWh$$

$$25 \:kWh$$

$$20 \:kWh$$

$$35 \:kWh$$

Solution

Question 7

Electrical conductor

Electrical insulator

Electrical appliance

Key

Solution

Question 8

outer electrons are strongly bound to the atom

outer electrons are loosely bound to the atom

inner electrons are loosely bound to the atom

protons can detach from the nucleus and conduct electricity

Solution

Question 9

Conduct electricity

Do not conduct electricity

Conduct electricity only at low temperatures

Conduct electricity at room temperature

Solution

Question 10

an insulator

a conductor

can be an insulator or conductor

none of these

Solution

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