Electricity and Circuits Test

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Electricity and Circuits Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

How many electrons constitute a current of one coulomb?

A
6.25 10¹²

B
6.25 10¹⁸

C
6.25 10¹⁵

D
6.25 10⁹

Solution

Using Q = ne

n = 6.25 x 10¹⁸
Question 2
1 / -0

An ebonite rod is rubbed with fur. Which of the following statements is true?

A
Electrons move from the fur to the ebonite rod.

B
Electrons move from the ebonite rod to fur.

C
Protons move from fur to the ebonite rod.

D
Protons move from ebonite rod to the fur.

Solution

When an ebonite rod is rubbed with fur, electrons move from the fur to the ebonite rod which makes fur positively charged and rod negatively charged.
Question 3
1 / -0

Two bodies A and B are rubbed together. Which of the following statements is true?

A
A and B get equal and opposite charges.

B
A and B get equal and similar charge.

C
A gets more charge than B of opposite kind.

D
A and B get opposite charges, but nothing can be said about the magnitude of charges.
Question 4
1 / -0

Good conductors have many loosely bound

A
atoms

B
molecules

C
protons

D
electrons
Question 5
1 / -0

Ampere – second stands for the unit of

A
power

B
energy

C
emf

D
electric charge
Question 6
1 / -0

Which of the following statements is correct for the movement of electrons between two points?

A
There should be a temperature difference between the two points.

B
There should be a potential difference between the two points.

C
Both the points must be at the same potential.

D
Electrons can even flow without any temperature and potential differences between the two points.
Question 7
1 / -0

Voltage can be generated

A
by rubbing certain types of materials against each other

B
by means of chemical reactions

C
by influence of magnetism on conductors

D
by all of these
Question 8
1 / -0

Which of the following is a correct relationship between a volt and coulomb?

A
1 V = 1 CJ^-1

B
1 V = 1 JC

C
1V = 1 JC^-1

D
1 V = 1 J^-1C^-1
Question 9
1 / -0

What is the resistance of the light bulb that carries a current of 3 amperes when it is connected to a 120 volts circuit?

A
3

B
120

C
40

D
360
Question 10
1 / -0

What is the strength of current flowing through a 20 resistance coil if it is connected with 4 volt battery?

A
5.0 A

B
0.2 A

C
8.0 A

D
4.0 A
Question 11
1 / -0

What will be the resistance of a conductor whose V-I graph is shown below?

A
7.5

B
3.0

C
1.5

D
0.5
Question 12
1 / -0

An electric bulb is marked as `100 W - 220 V`. What is the current flowing through its filament?

A
0.45 ampere

B
2.20 ampere

C
0.22 ampere

D
1.10 ampere
Question 13
1 / -0

An electric heater of 1000 watt is used for 5 hours everyday. What is the amount of electrical energy consumed in 30 days?

A
5000 units

B
150000 units

C
150 units

D
5 units
Question 14
1 / -0

An electric geyser draws a current of 10 amperes at 220 V. What is the cost of running it for 2 hours everyday in a month of 30 days, if the cost of electricity is Rs.1.20 per unit?

A
Rs. 264.00

B
Rs. 158.40

C
Rs. 316.80

D
Rs. 132.00
Question 15
1 / -0

Which of the following is a natural magnet?

A
Bar magnet

B
Electro magnet

C
Lodestone

D
Magnetic needle

Solution

A lodestone is a naturally magnetised piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron.
Question 16
1 / -0

Which of the following statements is NOT true?

A
Many magnets do not contain any iron at all.

B
Alloy of aluminium, nickel and cobalt is called alnico.

C
Stainless steel is a magnetic material.

D
A compass uses the directional property of a permanent magnet.
Question 17
1 / -0

Which of the following materials are magnetic in nature?
(i) Iron nail
(ii) Key of a car
(iii) Leather
(iv) Rubber ball
(v) Metal door handle

A
(i), (ii), (iv)

B
(i), (v)

C
(i), (ii), (iii), (v)

D
(i), (ii), (v)
Question 18
1 / -0

Which of the following statements is NOT true?

A
Electric fuse is a safety device.

B
An electric fuse is made of material having high melting point.

C
An electric fuse is connected in series.

D
We should never use a copper wire as a fuse wire.

Solution

A fuse is an electrical safety device that operates to provide overcurrent protection to an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby interrupting the current. A fuse is a short piece of wire made up of a material of high resistivity and low melting point. Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s). A copper wire cannot be used as a fuse wire because it has a high melting point. It will not melt easily when a high electric current passes through it and may damage the electrical appliances.
Question 19
1 / -0

By which of the following devices is consumed electrical energy measured?

A
Electric meter

B
Ammeter

C
Voltmeter

D
Potentiometer
Question 20
1 / -0

How many types of wire do all house hold electric circuits consist of?

A
One

B
Two

C
Three

D
Four