Physics-
General
Easy
Question
Assertion : Thermocouple acts as a heat engine.
Reason : When two junctions of thermocouple are at different temperature, thermo e.m.f. is produced.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If both assertion and reason are true but reason is not the correct explanation of the assertion.
- If assertion is true but reason is false.
- If the assertion and reason both are false.
The correct answer is: If both assertion and reason are true but reason is not the correct explanation of the assertion.
Related Questions to study
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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.
Reason : Voltage on A and B decreases
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.
Reason : Voltage on A and B decreases
physics-General
physics-
Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.
Reason : Voltage on A decreases.
Assertion : In the given circuit if lamp B or C fuses then light emitted by lamp A decreases.
Reason : Voltage on A decreases.
physics-General
physics-
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.
Reason : Property of resistance remain same even at high temperature.
physics-General
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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.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
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.
Reason : In series combination, power is directly proportional to the resistance of circuit. But in parallel combination, power is inversely proportional to the resistance of the circuit.
physics-General
physics-
Assertion : The electric bulbs glows immediately when switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
Assertion : The electric bulbs glows immediately when switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
physics-General
physics-
Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1 
and R = 1 , then reading of the voltmeter is 1V.
Reason : V = E-ir where E = 2V, 
=1A and R = 1 .
Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1 and R = 1 , then reading of the voltmeter is 1V.
Reason : V = E-ir where E = 2V, =1A and R = 1 .
physics-General
physics-
Two batteries, one of emf 18 volts and internal resistance 2 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 :
Two batteries, one of emf 18 volts and internal resistance 2 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
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For the network shown in the figure, the value of the current i is :
For the network shown in the figure, the value of the current i is :
physics-General
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When a current flows in a wire, there exists an electric field in the direction of :
When a current flows in a wire, there exists an electric field in the direction of :
physics-General
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When the key K is pressed at time t = 0, then which of the following statements about the current I in the resistor AB of the given circuit is true ?
When the key K is pressed at time t = 0, then which of the following statements about the current I in the resistor AB of the given circuit is true ?
physics-General
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In the following figure, current through 3 resistor is 0.8 amp; then the potential drop through 4 resistor is :
In the following figure, current through 3 resistor is 0.8 amp; then the potential drop through 4 resistor is :
physics-General
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In the figure shown below the e.m.f. of the cell is 2V and internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of voltmeter will be :
In the figure shown below the e.m.f. of the cell is 2V and internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of voltmeter will be :
physics-General
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In the circuit shown in the following figure, the potential difference between points A and B will be:
In the circuit shown in the following figure, the potential difference between points A and B will be:
physics-General
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There is no current in a 2 resistance, then the equivalent resistance of the given circuit is :
There is no current in a 2 resistance, then the equivalent resistance of the given circuit is :
physics-General
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A cell when balanced with potentiometer gave a balance length of 50 cm. Then a 4.5 external resistance is introduced in the circuit. Now it is balanced on 45 cm. The internal resistance of the cell is :
A cell when balanced with potentiometer gave a balance length of 50 cm. Then a 4.5 external resistance is introduced in the circuit. Now it is balanced on 45 cm. The internal resistance of the cell is :
physics-General
