Electricity Worksheet-6

Electricity Worksheet-6

1. The process of bringing about chemical reaction by passing an electric current through some conducting solution is called :

(a) chemical decomposition      (b) electric decomposition

(c) electrolysis                               (d) none of these

2. When a salt on dissolving in water breaks  down into positively  and negatively charged ions, it is called :

(a) decomposition                        (b) ionization

(c) dissociation                             (d) all of these

3. When the number of cells are connected in such a way that they have common positive terminal and common negative terminal, then the cells are connected in :

(a) series                                         (b) parallel

(c) mixed circuit                           (d) none of these

4. When the cells are connected in parallel, the electromotive force of cells is :

(a) more than one cell                 (b) less than one cell

(c) same as one cell                      (d) none of these

5. The emf of le-clanche cell is about:

(a) 1.5 V             (b) 1.1 V              (c) 1.75 V           (d) 2.0 V

6. The negative terminal of a bichromate cell is:

(a) amalgamated lead rod

(b) amalgamated zinc rod

(c) amalgamated tin rod

(d) amalgamated aluminium rod

7. Local action in simple voltaic cell can be overcome:

(a) by using pure zinc plate

(b) amalgamating zinc plate

(c) using alloy of zinc and copper

(d) none of these

8. When zinc plate is rubbed with mercury the pure zinc metal

(a) floats up on the surface of mercury

(b) impurities in zinc settle in the layer of mercury

(c) both floats up on the surface of mercury and impurities in zinc settle in the layer of mercury

(d) an alloy of zinc and mercury is formed

9. An energy which makes our life comfortable by doing a large number of jobs is :

(a) mechanical energy                (b) heat energy

(c) magnetic energy                     (d) electric energy

10. A device in an electric circuit which can turn on/off the electric circuit is called :

(a) an electric regulator              (b) an electric meter

(c) an electric switch                   (d) all of these

Answer Key:

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