Electricity and Magnetism Test

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Electricity and Magnetism Test - 3

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Weekly Quiz Competition

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 1/3 W. What is the maximum resistance he can obtain by connecting them?

A
3 W

B
2/3 W

C
1 W

D
1/9 W

Solution

On connecting in series, the resistance would be achieved.
Question 9
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.

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Electricity and Magnetism Test - 3

Result

Electricity and Magnetism Test - 3

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SHARING IS CARING

Question 1

Electrons move from the fur to the ebonite rod.

Electrons move from the ebonite rod to the fur.

Protons move from the fur to the ebonite rod.

Protons move from the ebonite rod to the fur.

Solution

Question 2

decrease

increase

remain unchanged

first increase and then decrease

Solution

Question 3

ammeter

voltmeter

rheostat

galvanometer

Solution

Question 4

they have the same quantity of charge

they are at the same potential

they have the same capacity

they have the same ratio of potential per unit charge

Solution

Question 5

must be negative

must be positive

must be zero

may be negative or positive

Solution

Question 6

energy

charge to mass

charge

potential difference

Solution

Question 7

6.25 × 1012

6.25 × 1018

6.25 × 1015

6.25 × 109

Solution

Question 8

3 W

2/3 W

1 W

1/9 W

Solution

Question 9

Bar magnet

Electro magnet

Load stone

Magnetic needle

Solution

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6.25 × 10¹²

6.25 × 10¹⁸

6.25 × 10¹⁵

6.25 × 10⁹