**Electric current and its effects**
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## 26 May 2011

### Electricity and its Effects TEST PAPER

CBSE TEST PAPER-01, Class - X Science
(Electricity and its Effects)

1. A metallic conductor has loosely bound
electrons called free electrons. The metallic conductor is
(a) negatively charged

(b) Positively charged

(c) neutral

(d) Either positively charged or negatively
charged

3. Which of the following expressions does
not represent the electric power in the circuit?

4. Resistivity of a metallic wise depends on

(a) its length

(b) its shape

(c) its thickness

(d) nature of material

5. If the current I through a
resistor is increased by 100% the increased in power dissipation will be
(assume temperature remain unchanged)

(a)100%

(b) 200%

(c) 300%

(d) 400%

6. How does use of fuse wire protect
electrical appliances?

7. Calculate the resistance of an electric
bulb which allows a 10A current when connected to a 220V power
source?

8. (i) Identify the V-I graphs for
ohmic and non-ohmic materials.

(ii) Material downloaded from

(ii) Give one example of each.

9. What do the following symbols represent
in a circuit? Write the name and one function of each?

10. Two metallic wires A and B are connected
in second wire A has length l and radius r, while wire B has length
2l and radius 2r. Find the ratio of total resistance of series combination
and the resistance of wire A, if both the wires are of same material?

11. Should the heating element of an
electric iron be made of iron, silver or nichrome wire? Justify giving
three reasons?

12. (a) Define electric resistance of a
conductor?

(b)A wire of length L
and resistance R is stretched so that its length is double and the area of
cross section is halved. How will its

(a) resistance change

(b) resistivity change?

13. Two resistor of resistance R and 2R are
connected in parallel in an electric circuit. Calculate the ratio of the
electric power consumed by R and 2R?

14. Two wires A and B are of equal length,
different cross sectional areas and made of same metal.

(a) (i) Name the property which is
same for both the wires,

(ii) Name the property which is different
for both the wires.

(b) If the resistance of wire A is four
times the resistance of wire B, Calculate

(i) the ratio of the cross sectional
areas of the wires and

(ii) The ratio of the radii of the
wire.

Labels:
10th Electricity and Effects,
10th Physics

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