physics MCQs – Page 39

Practise multiple-choice questions from physics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

physics Mcqs

761. Farad is the unit of___________?
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A. None of these

B. inductance

C. capacitance

D. voltage

762. CGS unit of Force is_________?
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A. Joule

B. Newton

C. Dyne

D. Erg

763. The minimum wavelength of X-rays can further be reduced by _______________?
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A. Increasing the temperature of the filament.

B. Reducing the pressure or cooling the target

C. Increasing the potential difference between the cathode and the target

D. Using a target element of higher atomic number

764. The simplest type of rectification known as half wave rectification is obtained by____________________?
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A. suppressing the harmonics in A.C voltage

B. using a transistor

C. suppressing half wave of A.C supply by using diode

D. using a Coolidge tube

765. Which one of the following is not a donor impurity ?
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A. antimony

B. arsenic

C. aluminium

D. phosphorus

766. Kirchhoffs 2nd rule is related to: ___________?
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A. IR Drops

B. Battery emf

C. junction voltages

D. both 1 and 2

767. Ohm is a unit of measuring _________?
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A. Voltage

B. Resistance

C. None of these

D. Current

768. The operational amplifier is______________?
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A. A high gain amplifier

B. A low resistance amplifier

C. A high resistance amplifier

D. A high-power amplifier

769. The mass-energy relation is the outcome of____________?
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A. None of these

B. Quantum theory

C. General theory of relativity

D. Special theory of relativity

770. The characteristic X-rays spectrum is due to_____________?
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A. The bombardment of target by electrons

B. The illumination of the target metal by ultra-violet radiation

C. The bombardment of the target by protons

D. The absorption of radiation by the target metal

771. Electrons present in p-type material due to thermal pair generation are_____________?
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A. majority carriers

B. dual carriers

C. blockers

D. minority carriers

772. Non-inverting amplifier circuits have____________?
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A. None of the above

B. A very low input impedance

C. A low output impedance

D. A very high input impedance

773. In the transistor schematic symbol, the arrow______________?
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A. is locate on the collector

B. is located on the emitter

C. is located on the base

D. points form north to south

774. Rain drops fall from great height Which among the following statements is true regarding it?
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A. their velocity increases and they fall with same velocity on the earth

B. their velocity increases and they fall with different velocity on the earth

C. they fall with same ultimate velocity

D. they fall with that ultimate velocity, which are different for different droplets

775. At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale?
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A. 160C

B. 360C

C. 280C

D. 460C

776. Thermions are________________?
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A. photons

B. positrons

C. electrons

D. protons

777. A stone is thrown upward from the top of a 59.4m high cliff with an upward velocity component of 19.6m/s how long is the stone in the air?
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A. 7.00 s

B. 4.00 s

C. 6.00 s

D. 5.00 s

778. Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
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A. B & C

B. A & B

C. A & C

D. A B & C

779. The efficiency of the Carnot engine working between 150C and 50C is__________?
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A. 29.40%

B. 23.6%

C. 100%

D. 50%

780. In He-Ne laser the lasing action is produced by_______________?
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A. Ne only

B. He-Ne both

C. Electrons Ne

D. Electrons of He

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