Class 12 Physics Model Paper 2 MCQs Test

ByMuhammad Zaman June 12, 2022October 28, 2022

FBISE Federal Board Class 12 Physics Model Paper 2 MCQs Test. Do as much practice as you can so that you get good marks in the final exams.

Class 12 Physics Model Paper 2 MCQs Test

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Class 12 Physics
Model Paper 2
Practice MCQs Test

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1. Potential inside a hollow charged spherical conductor:

varies directly as square of distance from the centre

varies directly as distance from centre

is constant

varies inversely as distance from centre

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2. For long-distance electrical power transmission, we use:

High current and small voltage

High current and high voltage

Low current and low voltage

Low current and high voltage

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3. Which phenomenon does NOT verify particle nature of light?

Compton effect

Diffraction

Photoelectric effect

Pair Production

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4. A force of 500 N is applied to one end of a cylindrical steel rod of diameter 50 cm, the tensile stress is:

2.5 x 10³ Nm^-2

1.0 x 10⁵ Nm^-2

2.5 x 10⁵ Nm^-2

1.5 x 10⁵ Nm^-2

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5. When the hot and cold junctions of a thermocouple are interchanged, the thermo-emf:

doubles

remain the same

becomes zero

changes the sign

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6. Two charges are placed at a certain distance apart in vacuum. If an insulating slab is placed between them, then force will:

Decrease

Be zero

Increase

Remains constant

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7. The quantity that remains constant in a transformer is:

Voltage

Power

Resistance

Current

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8. The source of emf transfers its maximum power to the external circuit when (r = internal resistance and R= load resistance):

r > R

r = R

r < R

r = 0

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9. The dimension of electric potential is same as that of:

work done per unit charge

work

electric force per unit charge

electric field per unit charge

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10. A radioactive nuclide ₈₆𝑅𝑎²²⁸ decays by a series of emissions of 3 alpha particles and 1 beta particle, the nuclide finally formed is:

₈₈𝑅𝑎²¹⁵

₈₄𝑅𝑎²²⁰

₈₆𝑅𝑎²²²

₈₃𝑅𝑎²¹⁶

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11. A galvanometer is made sensitive by:

Using a small and thick suspension wire

Reducing the number of turns of the coil

Increasing the magnetic field

Decreasing the area of the coil

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12. The minimum number of diodes required for full wave rectification are:

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13. The potential difference across the silicon PN junction is:

0.7 V

5.0 V

0.3 V

0.5 V

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14. If the resistivity of a conductor is 2 x 10^-6Ωm, then its conductivity is:

5 x 10⁶ Ω^-1m^-1

5 x 10⁵ Ω^-1m^-1

5 x 10^-5 Ω^-1m^-1

2 x 10⁶ Ω^-1m^-1

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15. The radius of 10th orbit in hydrogen atom is:

0.053 nm

53 nm

5.3 nm

0.53 nm

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16. The half-life of a certain radioactive nucleus is 1.6 x 10³ years. Its decay constant is:

1.4 x 10 ^-12 s ^-1

2.0 x 10 ^-11 s ^-1

2.0 x 10 ^-12 s ^-1

1.4 x 10 ^-11 s ^-1

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17. A coil of 150 loops is pulled in 0.06s from poles of the magnet, which decreases the magnetic flux linked with the coil from 6×10^-4 Wb to 2×10^-4 Wb. The average emf induced in the coil is:

0.15 V

1 V

0.1 V

1.5 V

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