Q10 of 30 Page 1

At the time of short circuit, the electric current in the circuit:

(a) vary continuously (b) does not change


(c) reduces substantially (d) increase heavily


OR


Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be:


(a) 0.4 A (b) 0.6 A


(c) 0.8 A (d) 1 A


(d)

With low resistance in the connection, a high current exists, causing the circuit to draw a large amount of energy in a very short time. Hence, during a short circuit, the current in the circuit increases heavily.


OR


(d) Same amount of current flows in all devices when connected in series


More from this chapter

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8

The chemical formula for plaster of paris is :

 9

The laws of reflection hold true for:

(a) plane mirrors only (b) concave mirrors only


(c) convex mirrors only (d) all reflecting surfaces


OR


When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. this image is:


(a) real (b) inverted


(c) virtual and inverted (d) virtual and erect


 11

Which one of the following is responsible for the sustenance of underground water?

 12

Incomplete combustion of coal and petroleum:

(A) increases air pollution.


(B) increases efficiency of machines.


(C) reduces global warming


(D) produce poisonous gases


The correct option is :