Physics Test 1

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Physics Test 1

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is true in context of internal resistance of battery?

A
Internal resistance of the cell increases as current in the circuit is decreased.

B
Internal resistance of the cell increases as external voltage is increased.

C
External voltage equals emf of battery when current is negligibly small.

D
EMF of the battery is variable over time.

Solution

Internal resistance of the battery does not depend on the current flowing through the circuit.

V= ε- Ir

Where V is external Voltage, ε is emf of the battery and r is internal resistance. So when r goes to zero, V = ε
Question 2
4 / -1

Which of the following is not true about transformers?

A
It is an application of Faraday’s Law of induction.

B
Power is transferred through magnetic field.

C
There is no metallic connection between two circuits.

D
In transformers, generally, there is no loss during transfer of power.

Solution

No loss during the transfer of power is only possible for theoretical transformers. Hence, option (D) is false.
Question 3
4 / -1

Which of the following is true about semiconductor devices?

A
BJT is majority charge carrier.

B
In PN junction diode, voltage increases drastically after threshold current is reached.

C
BJT has 3 junctions.

D
PN diode has minority charge carriers.

Solution

BJT and PN both are minority charge carriers which is the reverse current.

In PN diode, current increases drastically after some voltage threshold. Before this threshold there is negligible current flow.

BJT has 2 Junctions, Collector-Base and Base-emitter junction.
Question 4
4 / -1

Which of the following is true about transistor?

A
CB configuration has current gain but no voltage gain.

B
CE configuration has both voltage and current gain.

C
In CB combination, emitter is grounded.

D
Current gain is ratio of emitter current to base current.

Solution

CB configuration has voltage gain, and not current gain, which can be seen in CB characteristics.

In CB configuration, Base is grounded.

Current gain is the ratio of collector current to base current.
Question 5
4 / -1

Which one of the following is not correct about conductors?

A

The electric field is zero inside the conductor.

B
Charge density is zero inside the conductor.

C
Charge density is zero on surface of the conductor.

D
The electric field is perpendicular to surface just outside the conductor.

Solution

All the other options are properties of the conductor. There is no electric field and hence no charge density (Gauss’s law) inside the conductor. But free charges can be induced on the surface of the conductor (such that electric field is zero inside the conductor).
Question 6
4 / -1

Which of the following is true about Capacitance and capacitors?

A
Capacitance does not change after addition of dielectric.

B
Capacitance is directly proportional to potential difference across plates.

C
Electric field between the plates reduces when a dielectric material is added to capacitor.

D
Charge accumulated on capacitor is inversely proportional to its capacitance.

Solution

Capacitance depends on electric field and electric field reduces on addition of dielectric. Hence capacitance also changes after addition of dielectric. Capacitance is inversely proportional to potential difference across plates.

Also, charge accumulated is directly proportional to capacitance. More the capacitance more is the charge holding capacity of the capacitor.

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Physics Test 1

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Physics Test 1

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Question 1

Internal resistance of the cell increases as current in the circuit is decreased.

Internal resistance of the cell increases as external voltage is increased.

External voltage equals emf of battery when current is negligibly small.

EMF of the battery is variable over time.

Solution

Question 2

It is an application of Faraday’s Law of induction.

Power is transferred through magnetic field.

There is no metallic connection between two circuits.

In transformers, generally, there is no loss during transfer of power.

Solution

Question 3

BJT is majority charge carrier.

In PN junction diode, voltage increases drastically after threshold current is reached.

BJT has 3 junctions.

PN diode has minority charge carriers.

Solution

Question 4

CB configuration has current gain but no voltage gain.

CE configuration has both voltage and current gain.

In CB combination, emitter is grounded.

Current gain is ratio of emitter current to base current.

Solution

Question 5

The electric field is zero inside the conductor.

Charge density is zero inside the conductor.

Charge density is zero on surface of the conductor.

The electric field is perpendicular to surface just outside the conductor.

Solution

Question 6

Capacitance does not change after addition of dielectric.

Capacitance is directly proportional to potential difference across plates.

Electric field between the plates reduces when a dielectric material is added to capacitor.

Charge accumulated on capacitor is inversely proportional to its capacitance.

Solution

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