Electricity and Magnetism Test

Result

Electricity and Magnetism Test - 6

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Question 1
1 / -0

What happens when an ebonite rod is rubbed with fur?

A
Electrons move from the fur to the ebonite rod.

B
Electrons move from the ebonite rod to the fur.

C
Protons move from the fur to the ebonite rod.

D
Protons move from the ebonite rod to the fur.

Solution

When an ebonite rod is rubbed with fur, electrons are transferred from the fur to the rod, giving it a surplus of electrons. Since neutral materials have equal numbers of electrons and protons to balance out their charge, the rubbed rod possesses a net negative static charge.
Question 2
1 / -0

A glass rod is rubbed with silk and brought near the cap of a negatively charged gold leaf electroscope. The leaf divergence will

A
decrease

B
increase

C
remain unchanged

D
first increase and then decrease

Solution

A positively charged glass rod induces a negative charge on the near end of the electroscope and a positive charge on the far end, thus reducing the charge on the leaves, and decreasing their divergence.
Question 3
1 / -0

The potential difference is measured by means of an instrument called

A
ammeter

B
voltmeter

C
rheostat

D
galvanometer

Solution

The potential difference across the two point is measured by an instrument called voltmeter, whereas an ammeter is a measuring instrument used to measure the current in a circuit, a rheostat is an electrical instrument used to control a current by varying the resistance and a galvanometer is an instrument for detecting and measuring small electric currents.
Question 4
1 / -0

There is no flow of current between two charged bodies when connected because

A
they have the same quantity of charge

B
they are at the same potential

C
they have the same capacity

D
they have the same ratio of potential per unit charge

Solution

Current will flow only if there is a potential difference between two points.

That is, there is no flow of current between two charged bodies when connected because they are at the same potential.
Question 5
1 / -0

If a charged body attracts another body, then the charge on the other body _______.

A
must be negative

B
must be positive

C
must be zero

D
may be negative or positive

Solution

If a charged body attracts another body, then the charge on the other body may be negative or positive, because if the first body has a positive charge then the other body will have a negative charge and vice-versa.
Question 6
1 / -0

Electron volt is the unit of

A
energy

B
charge to mass

C
charge

D
potential difference

Solution

Electron volt is the unit of energy
Question 7
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

6.25 × 10¹⁸electrons constitute a current of one coulomb.
Question 8
1 / -0

A person has three resistors, each of value W. What is the maximum resistance he can obtain by connecting them?

A
3 W

B
W

C
1 W

D
W

Solution

On connecting in series, the resistance would be achieved.
Question 9
1 / -0

Which of the following is correct?

A
P = IR

B
P =

C
P = I²R

D
P =

Solution

P = I²R
Question 10
1 / -0

Which of the following is a natural magnet?

A
Bar magnet

B
Electro magnet

C
Load stone

D
Magnetic needle

Solution

Load stone is a natural magnet.
Question 11
1 / -0

If 18.75 × 10¹⁹ electrons flow through a conductor in 3 seconds, the total charge that flows through the conductor is

A
10 C

B
20 C

C
30 C

D
40 C

Solution

Total charge flown (Q) = number of electrons(n) × charge on the one electron (e)
Q = ne
Q = 18.75 × 10¹⁹ × 1.6 × 10^-19
Q = 30 C
Question 12
1 / -0

Two resistances R₁ and R₂ are connected parallel, what is the total resistance of the circuit?

A

B

C

D

Solution

1/R = 1/R₁+ 1/R₂
where R is the total resistance
Question 13
1 / -0

When a current (I) flows through a resistance (R) for time (t), the electrical energy spent is given by

A
IRt

B
I²Rt

C
IR²t

D

Solution

Power = I²R
Energy = Power x Time
= I²Rt
Question 14
1 / -0

When the main switch of a domestic circuit is put off, it disconnects

A
the live wire

B
the neutral wire

C
the earth wire

D
both the live and neutral wires

Solution

The main switch, live wire, and the neutral wire are in connection to the line wires in our homes; these wires then supply electricity to separate electric circuits within the house. When the main switch of a domestic circuit is put off, it disconnects both the live and neutral wires.
Question 15
1 / -0

When a fuse is rated 8 A, it means it

A
will not work if the current is less than 8 A

B
has a resistance of 8 ohms

C
will work only if the current is 8 A

D
will melt if the current exceeds 8 A

Solution

A fuse protects a circuit from excess current. It will melt if the current exceeds 8 A.
Question 16
1 / -0

In a household circuit, the appliances are connected in

A
series combination

B
parallel combination

C
series-parallel combination

D
All of the above

Solution

All appliances need a common potential difference, so they are connected in parallel.
Question 17
1 / -0

A fuse in an electric circuit is used to

A
increase the current in a circuit

B
control the voltage fluctuations in the circuit

C
break the circuit when excessive current flows

D
decrease the flow of current in the circuit

Solution

A fuse in an electric circuit is used to break the circuit when excessive current flows. The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.
Question 18
1 / -0

The fact that magnetic field is associated with current was discovered by

A
Oersted

B
Maxwell

C
Faraday

D
Ohm

Solution

Oersted in the year 1819, discovered that an electric current generates a magnetic field encircling it. Oersted's experiment that when an electric current is passed through a conducting wire, a magnetic field is produced around it.
Question 19
1 / -0

The commonly used safety fuse wire is made of

A
copper

B
nickel

C
lead

D
an alloy of tin and copper

Solution

The fuse wire should be made of the material which should have very low melting point. Generally, it is made up of an alloy of copper and tin.
Question 20
1 / -0

The unit of e.m.f. of a cell is

A
dyne

B
volt

C
ampere

D
joule

Solution

E.m.f. of a cell is the potential difference across the terminal of the cell when no current flows through the circuit. So, the units of the e.m.f. are the same as those of the potential difference, or we can say that the unit of e.m.f. of a cell is volt.