# Class 12 Physics Paper 2021 MCQs Test

FBISE Federal Board Class 12 Physics Paper 2021 MCQs Test. Do as much practice as you can so that you get good marks in the final exams.

Class 12 Past Papers

### Class 12 Physics Paper 2021 MCQs Test

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Class 12 Physics
Past Paper 2021
Practice MCQs Test

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1. The unit of permeability of free space is:

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2. The rest mass of an electron is 9.11 × 10-31 kg. The corresponding rest energy is:

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3. Bottom quark carries _____ charge

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4. Maximum power is delivered to a load R when the internal resistance of the source of emf is:

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5. Current in a circuit falls from 5.0A to 0A in 0.1 seconds. If an average emf of 200V is induced then the self-inductance is:

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6. The emission of photons when electrons are incident on metal is called:

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7. An inductor of 1.0 H in an AC circuit has a reactance of 502.4Ω. The frequency of AC will be:

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8. The relation between beta factor (β) and alpha factor (α) is:

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9. In a parallel plate capacitor if the plate separation is doubled and the plate area is halved then the capacitance is:

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10. When area A is making an angle of 0° with electric field lines then the electric flux is:

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11. In an AC generator the maximum value of induced emf is:

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12. Eddy current is produced when:

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13. Steffen’s constant has the value of:

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14. Electric potential of earth is taken to be zero because the earth is a good:

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15. A two-microfarad capacitor is subjected to a 4000V potential difference. The energy stored in the capacitor is:

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16. The circuit in which current leads the voltage by 90°. The power factor is:

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17. 1 kWh is equal to: