Physics-
General
Easy
Question
There are two coils A and B as shown in fig. What is the direction of the momentary current induced in coil B, when switch S is pressed

- anticlockwise
- clockwise
- no current is induced
- alternating current in B.
The correct answer is: anticlockwise
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The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20.0 mT/s. Each side of the square loop abcd and defa has a length of 1.00 cm and a resistance of 4.00
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Assertion : Thermocouple acts as a heat engine.
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Assertion : Thermocouple acts as a heat engine.
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Assertion : If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short circuited and hence illumination of bulbs A and B decreases.

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Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.

Reason : Voltage on A decreases.
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Reason : Voltage on A decreases.
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Assertion : In practical application, power rating of resistance is not important.
Reason : Property of resistance remain same even at high temperature.
Assertion : In practical application, power rating of resistance is not important.
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Assertion : Two electric bulbs of 50 and 100 W are given. When connected in series 50 W bulb glows more but when connected parallel 100 W bulb glows more.
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Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1
and R = 1
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Reason : V = E-ir where E = 2V,
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Two batteries, one of emf 18 volts and internal resistance 2
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and the other of emf 12 volts and internal resistance 1
, are connected as shown in the figure. The voltmeter V will record a reading of :

physics-General