Electricity Worksheet-2

Electricity Worksheet-2

1. Which is not an application of electrolysis?

(a) Electroplating                         (b) Electrotyping

(c) Purification of metals           (d) Radio-telegraphy

2. During purification of a metal, the impure metal is connected to :

(a) cathode                                     (b) anode

(c) Anode or cathode                   (d) none of these

3. The magnetic effect of an electromagnet can be increased

(a) by increasing the number of turns in its coil

(b) by inserting soft iron core in the coil

(c) by increasing the magnitude of current in the coil

(d) all of these

4. Electromagnets are not used for making :

(a) compass needles

(b) magnetic stickers

(c) electric bells

(d) compass needles and magnetic stickers

5. An electric circuit starting from one terminal of the cell to another terminal of the cell, which is broken at one or more points is called :

(a) closed electric circuit

(b) open electric circuit

(c) incomplete electric circuit

(d) both open electric circuit and incomplete electric circuit

6. When a number of cells are connected end to end such that the positive terminal of one cell is connected to the negative terminal of the next cell, then the combination of cells are in :

(a) series                                         (b) parallel

(c) mixed circuit                           (d) none of these

7. The liquid used in le-clanche cell is :

(a) dilute HCl

(b) dilute NaOH

(c) saturated   ammonium   chloride solution

(d) saturated copper sulphate solution

8. The depolariser used in le-clanche cell is :

(a) magnesium oxide                  (b) manganese dioxide

(c) manganese chloride              (d) none of these

9. The major defects of the simple voltaic cell are called:

(a) local action

(b) polarization

(c) neutralisation

(d) both local action and polarization

10. During local action in simple voltaic cell :

(a) tiny hydrogen bubbles collect at the copper plate

(b) a large number of local cells are formed

(c) a large number of local cells are formed at the copper plate

(d) all of these

Answer Key:

1. (d)
2. (b)
3. (d)
4. (d)
5. (d)
6. (a)
7. (c)
8. (b)
9. (d)
10. (b)