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.

  1. If both assertion and reason are true and the reason is the correct explanation of the assertion.    
  2. If both assertion and reason are true but reason is not the correct explanation of the assertion.    
  3. If assertion is true but reason is false.    
  4. 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

General
physics-

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
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
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
parallel
General
physics-

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
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
General
physics-

Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1 capital omega and R = 1 capital omega, then reading of the voltmeter is 1V.

Reason : V = E-ir where E = 2V, i equals fraction numerator 2 over denominator 2 end fraction=1A and R = 1 capital omega.

Assertion : In the following circuit emf is 2V and internal resistance of the cell is 1 capital omega and R = 1 capital omega, then reading of the voltmeter is 1V.

Reason : V = E-ir where E = 2V, i equals fraction numerator 2 over denominator 2 end fraction=1A and R = 1 capital omega.

physics-General
parallel
General
physics-

Two batteries, one of emf 18 volts and internal resistance 2 capital omega and the other of emf 12 volts and internal resistance 1 capital omega, 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 capital omega and the other of emf 12 volts and internal resistance 1 capital omega, are connected as shown in the figure. The voltmeter V will record a reading of :

physics-General
General
physics-

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
General
physics-

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
parallel
General
physics-

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
General
physics-

In the following figure, current through 3 capital omega resistor is 0.8 amp; then the potential drop through 4 capital omega resistor is :

In the following figure, current through 3 capital omega resistor is 0.8 amp; then the potential drop through 4 capital omega resistor is :

physics-General
General
physics-

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
parallel
General
physics-

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
General
physics-

There is no current in a 2 capital omega resistance, then the equivalent resistance of the given circuit is :

There is no current in a 2 capital omega resistance, then the equivalent resistance of the given circuit is :

physics-General
General
physics-

A cell when balanced with potentiometer gave a balance length of 50 cm. Then a 4.5 capital omega 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 capital omega external resistance is introduced in the circuit. Now it is balanced on 45 cm. The internal resistance of the cell is :

physics-General
parallel

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