NCERT Class VIII Science Solutions: Chapter 14-Chemical Effects of Electric Current Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

An electric current can produce

(a) Heating effect only.

(b) Chemical effect only.

(c) Magnetic effect only.

(d) Chemical, heating, and magnetic effects.

Answer: D

An Electric Current Can Produce a Magnetic Field

Question 2:

Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B as shown in

As Showing in Fig is a Boojho and Paheli Experiments

They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that

  1. Higher current is flowing through the circuit in setup A.
  2. Higher current is flowing through the circuit in setup B.
  3. Equal current is flowing through both the circuits.
  4. The current flowing through the circuits in the two setups cannot be compared in this manner.

Answer: A

Question 3:

Boojho՚s uncle has set up an electroplating factory near his village. He should dispose of the waste of the factory

  1. In the nearby river.
  2. In the nearby pond.
  3. In the nearby cornfield.
  4. According to the disposal guidelines of the local authority.

Answer: D

Question 4:

When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates

  1. The chemical effect of current.
  2. The heating effect of current.
  3. The magnetic effect of current.
  4. The lightning effect of current.

Answer: A

Question 5:

Which one of the following solutions will not conduct electricity?

  1. Lemon juice
  2. Vinegar
  3. Tap water
  4. Vegetable oil

Answer: D