Physics – Class 12 Mock Test 3

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Question 1 of 10

1. Identify the material whose resistivity is more than 10¹⁴ Ωm.

Silicon

Aluminum

Bakelite

Copper

Question 1 of 10

Question 2 of 10

2. Which is the factor that internal resistance does not depend on?

Temperature of the electrolyte

Distance between the electrodes

Area of the electrode, immersed in the electrolyte

Nature of electrode and electrolyte

Question 2 of 10

Question 3 of 10

3. What is the equivalent resistance of series combination of 3 resistors?

R_s = \(\frac {1}{R_1} + \frac {1}{R_2} + \frac {1}{R_3}\)

R_s = \(\frac {(R_1 + R_2)}{R_3}\)

R_s = R₁ + R₂ + R₃

R_s = \(\frac {1}{(R_1 + R_2 + R_3 )}\)

Question 3 of 10

Question 4 of 10

4. What is the SI unit of mobility?

m²V^-1s^-1

m²V^-2s^-1

Vm^-1

mV^-2

Question 4 of 10

Question 5 of 10

5. When is the effective capacitance of a capacitor increased?

When the capacitors are connected in parallel

When the capacitors are connected in series and parallel simultaneously

When the capacitors are randomly connected

When the capacitors are connected in series

Question 5 of 10

Question 6 of 10

6. How does the capacitance change with the effect of the dielectric when the battery is kept disconnected from the capacitor?

Decreases

Increases

Remains constant

Zero

Question 6 of 10

Question 7 of 10

7. Which of these is a correct definition of conventional current?

The current which remains static

Current that flows from higher potential to lower potential

Current that flows from lower potential to higher potential

Current constituted by the flow of ions

Question 7 of 10

Question 8 of 10

8. Calculate the drift velocity of free electrons if a current of 5 A is maintained in a conductor of cross-section 10^-2m². The number density of free electrons is 5 × 10²⁰m^-3.

6.25 ms^-1

5.25 ms^-1

12.25 ms^-1

2.25 ms^-1

Question 8 of 10

Question 9 of 10

9. What is the reciprocal of resistivity of a material called? Give its unit.

Conductance, ohm^-1 m^-1

Conductivity, ohm^-1 m^-1

Conductance, ohm^-1

Conductivity, ohm^-1

Question 9 of 10

Question 10 of 10

10. Identify the type of conductor represented by the V-I characteristic curve given below.

Metallic conductor

Thyristor

Water voltameter

Semiconductor

Question 10 of 10