# electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

#### electric current and magnetism PRACTICE TEST [9 - EXERCISES]

Question : 1 [BPSC (Pre) 1995]

Electricity consumption bill is based on the measurement of

1. Watt
2. Voltage
3. Ohm
4. Ampere

a) 2 and 3

b) Only 1

c) 1 and 2

d) 1 and 4

Question : 2

Consider the following statements regarding a motor car battery:

1. The voltage is usually 12 V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?

a) 3 and 4

b) 1 and 2

c) 2 and 3

d) 1 and 4

In case of motor car battery or automotive batteries a nominal 12-volt potential difference is provided by connecting six galvanic cells in series. Capacity of these batteries is expressed in ampere-hour.

Electrolyte used is a solution of about 35% sulphuric acid and 65% water and electrodes used are plates of lead and separate plates of lead dioxide.

Question : 3 [IAS (Pre) 1996]

Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A):
Transformer is useful for stepping up or stepping down voltages.
Reason (R):
Transformer is a device used in D.C. circuits.
In the context of the above two statements, which one of the following is correct?

a) (A) is true, but (R) is false

b) Both (A) and (R) are true and (R) is the correct explanation of (A)

c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 4

Faraday’s laws are consequence of conservation of

a) energy and magnetic field

b) charge

c) energy

d) magnetic field

Faraday’s laws are based on the conversion of electrical energy into mechanical energy; which is in accordance with the law of conservation of energy

Question : 5

According to international convention of colour coding in a wire

a) live is red, neutral is green and earth is black

b) live is brown, neutral is blue and earth is black

c) live is red, neutral is black and earth is green

d) live is red, neutral is black and earth is green

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