Electricity and Circuits Test

Result

Electricity and Circuits Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following store(s) the chemical energy in an electric cell?

A
Electrolyte

B
Negative terminal

C
Positive terminal

D
All of the above

Solution

Plates are kept inside a chemical called electrolyte, which stores the chemical energy .
Question 2
1 / -0

The dark grey granular powder inside a cell is a mixture of ___________ and carbon particles.

A
manganese trioxide

B
manganese dioxide

C
manganese sulphate

D
manganese chloride

E
manganese carbonate

Solution

This is the correct option. The dark grey granular powder inside a cell is a mixture of manganese dioxide and carbon particles.
Question 3
1 / -0

Which of the following options depicts an incorrect relationship between an electric device and its symbol?

A

B

C

D

Solution

Option (1) depicts the incorrect relationship between an electric device and its symbol.
A cell is represented as follows:
Question 4
1 / -0

In which of these circuits will the bulb glow the brightest?

A
Only (a)

B
Only (d)

C
Only (b)

D
Both (a) and (c)

Solution

The bulb will glow the brightest in (b) because two batteries are attached to it which are providing power.
In (a), only one battery is providing power to one bulb.
In (c), only one battery is providing power to two bulbs.
In (d), the bulb will not glow because there is no power source.
Question 5
1 / -0

Which symbols are used to represent the switch in 'ON' and 'OFF' positions?

A

B

C

D

Solution

(the switch is on because the wires are connected)
(the switch is off when the wires are disconnected)
Question 6
1 / -0

The filament of a torch bulb is fixed to two thicker wires. One thick wire is connected to the ________ and the other thick wire is connected to the ___________.

A
metal case at the base of the bulb; metal tip at the centre of the base

B
metal case at the upper side of the bulb; metal tip at the centre of the base

C
metal tip at the upper side of the bulb; metal case at the centre of the base

D
metal case at the base of the bulb; metal tip at the base of the bulb

Solution

One thick wire is connected to the metal case at the base of the bulb and the other thick wire is connected to the metal tip at the centre of the base.
Question 7
1 / -0

The handles of the tools like pliers used by electricians for repair work usually have plastic covers on them. What is/are the reason(s) for this?

(a) Because plastic is a good conductor of heat
(b) Because plastic is a good conductor of electricity
(c) Because plastic is a bad conductor of electricity

A
Only (a)

B
Only (b)

C
Only (c)

D
Only (a) and (b)

Solution

Plastic is a bad conductor of electricity, therefore it can be used on handles of pliers used by electricians for repair work and they don't get shock when in operation.
Question 8
1 / -0

In a voltaic cell, _____________ energy is converted into electrical energy.

A
mechanical

B
thermal

C
chemical

D
kinetic

E
None of these

Solution

In a voltaic cell, the chemical energy produced due to the reactions between the electrolyte and electrode is converted into the electrical energy.
Question 9
1 / -0

Which of the following sets of materials represents insulators?

A
Copper, iron, gold

B
Wood, plastic, porcelain

C
Silver, gold, lead

D
Water, aluminium, iron

Solution

Wood, plastic and porcelain are insulators as they do not allow the electric current to pass through them and are mostly used for safety purposes.
Question 10
1 / -0

Which of the following is a bad conductor of electricity?

A
Air

B
Water

C
Human body

D
Gold chain

Solution

Air is a bad conductor of electricity because it does not have free electrons to conduct electricity.
Question 11
1 / -0

Which of the following is/are the correct reason(s) for using tungsten in an incandescent bulb?

A
It is lustrous and shining.

B
It has a very high melting point.

C
It has a low melting point.

D
It is a bad conductor of heat.

E
All of the above

Solution

Yes, because of a very high melting point, tungsten is used as a filament in an incandescent bulb.
Question 12
1 / -0

In the given circuit, which of the switches have to be closed so that only A and D bulbs glow?

A
S_1,S₅and S₂

B
S₁, S₅and S₃

C
S₁, S₅ and S₄

D
Any of the given combination

Solution

We have to close the switches S₁ and S₃and S₅ in order to make the bulbs A and D glow.
Question 13
1 / -0

In the given circuit, which of the following switches have to be closed so that only A and E bulbs glow?

A
S₁ and S₄

B
S₁ and S₂

C
S₁ and S₃

D
Not possible

Solution

It is not possible that only A and E bulbs glow. On closing the switches S₁ and S₄, the bulbs A, E and F will glow.
Question 14
1 / -0

In the given circuit, if we close all the switches, which bulb will not glow?

A
B

B
C

C
D

D
F

Solution

When we close the switch S₅, bulb B will be short circuited. So, bulb B will not glow.
Question 15
1 / -0

In the given circuit, if we close the switches S₁ and S₂, then

A
the bulbs A, B and C will glow

B
the bulbs A, B and D will glow

C
the bulbs A, E and F will glow

D
no bulb will glow

Solution

If we close the switches S₁ and S₂, the circuit is still open and no bulb will glow.