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.


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The chemical formula for plaster of paris is:

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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


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