Electricity Worksheet-1

Electricity Worksheet-1

1. Electromagnets are used in :

(a) telephones

(b) radios

(c) both telephones and radios

(d) none of these

2. When electric current is passed through acidulated water, it splits into hydrogen and oxgen. This effect of electric current is called:

(a) chemical effect

(b) magnetic effect

(c) electromagnetic effect

(d) all of these

3. When the cells are connected in series, the electromotive force of the cells is :

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

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

4. When the cells are connected in series, the current output of the combination :

(a) increases                                 (b) decreases

(c) remains same                         (d) none of these

5. The le-clanche cell is useful for operating electric devices which need :

(a) a continuous large current

(b) a continuous weak current

(c) a weak and intermittent current

(d) a heavy and intermittent current

6. Dry cells is an inprovement of :

(a) simple voltaic cell                  (b) wet le-clanche cell

(c) bichromate cell                       (d) none of these

7. Local action in simple voltaic cell is caused due to impurities in :

(a) zinc plate                                 (b) copper plate

(c) dilute sulphuric acid             (d) all of these

8. During local action, the emf of a simple voltaic cell:

(a) remains constant                   (b) decreases

(c) increases                                  (d) none of these

Answer Key:

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