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

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2. An inductor of 1.0 H in an AC circuit has a reactance of 502.4â„¦. The frequency of AC will be:

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3. Bottom quark carries _____ charge

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4. Eddy current is produced when:

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5. 1 kWh is equal to:

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6. The rest mass of an electron is 9.11 Ã— 10-31 kg. The corresponding rest energy is:

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7. The relation between beta factor (Î²) and alpha factor (Î±) is:

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

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

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

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

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12. 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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13. Steffenâ€™s constant has the value of:

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14. The unit of permeability of free space is:

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

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

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