physics MCQs – Page 38

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 Review each marked answer and report any item that may be outdated or unclear.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
741. Newtons Third Law of Motion?
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A. every action there is an equal and opposite reaction.

B. temperature remaining constant, volume of a given mass of a gas varies inversely

C. volume of a given mass of gas increases or decreases

D. attraction or repulsion between two charges

742. The most suitable unit for expressing nuclear radius is_______?
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A. Fermi

B. Angstrom

C. Micro

D. Nano meter

743. The electronic circuits which implement the various logic operations are called_____________?
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A. Logic functions

B. Boolean algebra

C. Logic gates

D. Amplifier gain

744. In forward bias the width of potential barrier_____________?
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A. Decreases

B. Remains same

C. Increases

D. No effect

745. Joule Thomson effect is based upon __________ ?
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A. Sudden compression of gases

B. Cooling of gases

C. Sudden expansion of gases

D. Heating of gases

746. The first overtone of a stretched string of given length is 320 Hz. The first harmonic is_________?
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A. 160 Hz

B. 640 Hz

C. 320 Hz

D. 480 Hz

747. Which one of the following has the greatest energy gap ?
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A. insulator

B. any of above

C. conductor

D. semi conductor

748. A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:
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A. in front of the retina

B. behind the retina

C. on the blind spot

D. on the retina

749. A million electron are added to a pith ball. Its charge is________?
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A. 1.6 1013 coulomb

B. 1.6 10 coulomb

C. 1.6 10 <sup>18</sup> coulomb

D. 1.6 10<sup>12</sup> coulomb

750. If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of______________?
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A. Avagadros law

B. Boyles law

C. Charles law

D. Ideal gas law

751. In fission process_______.
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A. massive nucleus join together

B. massive nucleus splits to form smaller fragments

C. both A & B

D. None of these

752. The performance of a refrigerator is described by________________?
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A. efficiency

B. coefficient of performance

C. both A and B

D. not described

753. The value of ? for diatomic gas is_______________?
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A. 1.4

B. None

C. 1.67

D. ? = 1.3

754. Who were the pioneers of Physics?
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A. Latin

B. Persians

C. Greek

D. Egyptians

755. If a lift is going up with acceleration, the apparent weight of a body is:
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A. More or less the true weight

B. More than the true weight

C. Less than the true weight

D. Equal to the true weight

756. To measure the speed of an approaching car a police officer shines?
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A. ultra high frequency waves on it

B. light waves on it

C. microwaves on it

D. radio waves on it
757. In addition to the daughter nucleus and an electron or positron, the products of a beta decay
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A. Proton

B. Neutrino

C. Alpha particle

D. Neutrons

758. The operation of a transistor requires______________?
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A. None of the above

B. That the emitter be heated

C. That the collector be heated

D. That the base be heated

759. Gravitation force of moon is_________?
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A. 1.62 m/s

B. 7.2 m/s

C. 3.75 m/s

D. 9.8 m/s

760. Depletion region of a junction is formed_____________?
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A. under forward bias

B. under reverse bias

C. when temperature varies

D. during the manufacturing process