West Bengal Police Constable Special Mock Test

Physics - Current Electricity

1 / 10

1) In an RL circuit, what happens to the time constant of the circuit if the resistance is doubled and the inductance is halved?

A) Time constant is halved

B) Time constant decreases by a factor of four

C) Time constant remains unchanged

D) Time constant doubles

2 / 10

2) A 60 W bulb and a 100 W bulb are connected in series. Which of the two bulbs will glow brighter?

A) Depends on the voltage of the circuit

B) 100 W bulb

C) Both will glow with the same brightness

D) 60 W bulb

3 / 10

3) A thermistor is used to monitor temperature changes. How does the resistance of a thermistor typically behave with increasing temperature?

A) Increases

B) Decreases

C) Becomes infinite

D) Remains constant

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4) In a parallel plate capacitor, the plates are separated by a dielectric material with dielectric constant K. If K is increased, which of the following occurs?

A) Capacitance decreases

B) Capacitance increases

C) Capacitance becomes zero

D) Capacitance remains the same

5 / 10

5) Who discovered electricity?

A) Alexander Graham Bell

B) Thomas Edison

C) Nikola Tesla

D) Benjamin Franklin

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6) ‘Pressure’ is related to ‘Pascal’ and ‘Electricity’ is related to ‘Watt' in the same way as
‘Heat’ is related to *, "

A) Joule

B) 0hm

C) Volt

D) Bar

7 / 10

7) When hot springs are used to generate electricity, this type of energy produced is called

A) 2. Tidal Energy

B) 1. Ocean Thermal Energy

C) 3. Geothermal Energy

D) 4. Thermal Energy

8 / 10

8) In a circuit with a constant voltage source, the current I is observed to decrease over time. Which of the following could be the cause for this observation?

A) Increase in resistance due to a temperature rise

B) Increase in the capacitance of the circuit

C) Decrease in voltage due to source instability

D) Constant temperature with decreasing resistance

9 / 10

9) In a potentiometer experiment, the balancing length is found to be 50 cm. If the length of the wire is increased to 100 cm, how will the balancing length change, assuming all other conditions remain constant?

A) No change

B) 25 cm

C) 100 cm

D) 50 cm

10 / 10

10) A DC motor has coils with a significant amount of inductance. What effect does this inductance have on the motor's operation when the current is suddenly switched off?

A) The motor generates a back emf

B) The motor continues to run indefinitely

C) The motor stops immediately

D) The motor speed increases

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Curriculum

Physics (Current Electricity বিদ্যুৎ প্রবাহ)

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