Question

Chemical effects of electric current are used in the working of ________
(a) Electrolytic cells
(b) Galvanic cells
(c) Electrochemical cells.
(d) None of these

Like charges________ each other.

(a) Attract

(b) Repel

(c) Both

(d) None:

19.Presence of unwanted and excessive sound in the environment______produces.

(a) Air pollution

(b) Water pollution

(c) Sound pollution

(d) soil pollution

17Name the ray which comes back from the surface after reflection.

(a) Reflected ray

(b) Incident ray

(c) Refracted ray

(d) None of these​

Answer 1

Answer:

1. a

2.c

3.c

4. Incident ray

Explanation:

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Answer 2

Answer:

1) Chemical effects of electric current are used in the working of electroplating.

2)repel

3) Sound pollution

4) reflected ray