Electric Current Test

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Electric Current Test - 24

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Question 1
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Electric appliance with metal body has three electrical connections. But an electrical bulb has two electrical connections.
Reason (R): Three pin connection reduces chances of electrical shocks.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

The metallic body of the electrical appliance is connected to the 3rd pin which is an earth pin. By any chance if the metallic body gets connected to the LIVE line, current flows to earth through this pin without giving any shock to the user. Hence the assertion is true. Electric bulb does not have any metallic enclosure and hence there is no requirement of an earth pin. So, the reason is also true and properly explains the assertion.
Question 2
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The same amount of current flows through the filament and line wire. But more heat is produced in filament.
Reason (R): Filament is made of material having high resistance and high melting point.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Heat produced = H = i₂Rt H µ R Since resistance of filament >> Resistance of wire so more heat is produced in filament. Therefore, Assertion is true. Filament is made of material having high resistance like tungsten so that heat produced is more. Melting point of the material also should be high so that it can sustain more heat. Hence reason is also true. Reason properly explains the assertion.
Question 3
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Kirchhoff ’s junction rule is applicable for any number of lines meeting at a point in an electrical circuit.
Reason (R): When there is a flow of steady current, then there is no accumulation of charge at the junction.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Kirchhoff ’s junction rule is applicable at any point of an electrical circuit and there is no limitation of number of lines meeting at that point. So the assertion is true. While steady current is flowing there is no accumulation of charge at the junction. Total incoming charge = total outgoing charge. So the reason is also true and explains the assertion.
Question 4
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): In balanced condition, if the galvanometer and the voltage source is interchanged, the balanced condition remains same.
Reason (R): The balanced condition of Wheatstone bridge does not depend on the value of the resistances.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

In balanced condition, if the galvanometer and the voltage source are interchanged, the balanced condition remains same since in both the cases R1R4 remains equal to R2R3 . The assertion is true. The balanced condition of Wheatstone bridge depends on the value of the resistances. R1R4 should be equal to R2R3. So, if the resistance values are changed, the balanced condition also gets disturbed. So, the reason is false.
Question 5
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): A high resistance is connected in series with the galvanometer of the meter bridge.
Reason (R): As resistance increases, the current also increases.

A
A. Both A and R are true and R is the correct explanation of A

B
B. Both A and R are true but R is NOT the correct explanation of A

C
C. A is true but R is false

D
D. A is false and R is true

Solution

Resistance of galvanometer is low. So, to protect it from damage a high resistance is connected in series with it which limits the flow of current through it. So the assertion is true. From Ohm's law, I = V/R. So as resistance increases, the current decreases. Hence the reason is false.
Question 6
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Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The balancing point of a meter bridge is obtained at L = 40 cm. When the area of cross-section of the wire of is doubled, the balancing point shifts to L = 60 cm.
Reason (R): Resistance of wire is directly proportional to its area of cross-section .

A
Both A and R are true and R is the correct explanation of A

B
Both A and R are true but R is NOT the correct explanation of A

C
A is true but R is false

D
Both A and R is false

Solution

For a meter bridge, at the balancing point R/X = L/100-L area of cross section. So, the assertion is false. Resistance of wire is inversely proportional to its area of cross-section since R = R = ρL/A. So the reason is also false.
Question 7
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A larger dry cell has higher emf.
Reason : The emf of a dry cell is proportional to its size.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

The energy given by the cell in the flow of unit charge in the whole circuit is called the emf of the cell. The emf is a characteristic of the cell which depends upon the nature of the plates and the electrolyte used in cell. Hence, the emf does not depend upon the size of the cell.
Question 8
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A current continues to flow in the superconducting coil even after the switch is off.
Reason : Superconducting coils show Meissner effect.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

The assertion is true. Even when the emf is switched off, the current continues to flow because its resistance becomes zero. The Meissner effect is another property of the superconductor and not the reason for the assertion. Meissner effect repels the magnetic field lines from the interior of the superconductor.
Question 9
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : Ohm’s law is applicable for all conducting elements.
Reason : Ohm’s law is a fundamental law.

A
A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B
B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C
C. If the Assertion is correct but Reason is incorrect.

D
D. If both the Assertion and Reason are incorrect.

Solution

A conducting device obeys ohm's law when the resistance of the device is independent of the magnitude and polarity of the applied potential difference which happens in metallic conductors. The reason is false as ohm's law is not true for non-ohmic conductors such as junction diodes.
Question 10
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: The possibility of an electric bulb fusing is higher at the time of switching ON and OFF
Reason: Inductive effects produce a surge at the time of switch ON and OFF

A
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.

B
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

C
C. If the assertion is true but the reason is false.

D
D. If the assertion and reason both are false.

Solution

The possibility of an electric bulb fusing is higher at the time of switching ON and switching OFF because inductive effect produces a surge at the time of switching ON and OFF.

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Electric Current Test - 24

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Electric Current Test - 24

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Question 1

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 2

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 3

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 4

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 5

A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is NOT the correct explanation of A

C. A is true but R is false

D. A is false and R is true

Solution

Question 6

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is NOT the correct explanation of A

A is true but R is false

Both A and R is false

Solution

Question 7

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 8

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 9

A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

C. If the Assertion is correct but Reason is incorrect.

D. If both the Assertion and Reason are incorrect.

Solution

Question 10

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.

B. If both assertion and reason are true but reason is not the correct explanation of the assertion.

C. If the assertion is true but the reason is false.

D. If the assertion and reason both are false.

Solution

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