physics MCQs – Page 42

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 Review each marked answer and report any item that may be outdated or unclear.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
821. The value of R ( Universal Gas Constant ) = ___________?
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A. 10.314 J/mole K

B. 8.314 J/mole K

C. 6.5 J/mole K

D. 1.314 J/mole K

822. The average acceleration caused by gravity per second is____________?
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A. 52 feet

B. 22 feet

C. 32 feet

D. 42 feet

823. Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?
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A. Number of incident electron i.e. filament current

B. All of above are correct

C. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated

D. The soft target which can easily emit electrons

824. Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their_____________?
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A. time

B. pressure

C. absolute temperature

D. volume

825. Youngs modulus is the property of __________?
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A. Liquid only

B. Gas only

C. All of the above

D. Solid only
826. The value of acceleration due to gravity is minimum on which of these planets?
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A. Jupiter

B. Mars

C. Mercury

D. Neptune

827. What is unit of conductivity?
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A. Ohm

B. Watt

C. None of these

D. mho
828. The unit of force in CGS, system is __________?
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A. Dyne

B. Newton

C. Pound

D. None of these

829. Rutherford in his atomic model could not explain behavior of ___________ ?
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A. Neutrino

B. Protons

C. Neutrons

D. Electrons
830. Matter itself has energy called ________?
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A. Nuclear energy

B. Rest energy

C. Potential energy

D. Chemical energy

831. To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________?
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A. 3

B. 4

C. 2

D. 5
832. The device or circuit used for conversion of A.C. into D.C. is called_______________?
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A. Converter.

B. An amplifier.

C. A rectifier

D. Filtering circuit

833. The Fahrenheit and centigrade scales agree to________________?
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A. 40

B. 273

C. 15.5

D. 542

834. If electrical conductivity increases with the increase of temperature of a substance, then it is a:
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A. Conductor

B. Insulator

C. Semiconductor

D. None of the above

835. According to Pascals law the pressure of gas in a vessel is_____________?
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A. Same only along normal directions

B. Same only along opposite directions

C. Different in different direction

D. Same in all direction
836. Semi-conductor germanium and silicon are_________________?
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A. tetravalent

B. trivalent

C. divalent

D. pentavalent

837. Triple point of water is_____________________?
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A. 273C at 6.11 Kpa

B. 273.16C at 0.611 Kpa

C. 273K at 61.6 Kpa

D. 273.16K at 750 Kpa

838. How many electrons per second constitute a current of one micro ampere?
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A. 6.25 1012 electrons

B. 10 <sup>6</sup> electrons

C. one electron

D. 10<sup>6</sup> electrons

839. What is the acceleration of free fall on the moon of that on the Earth ?
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A. 1/8th

B. 1/4th

C. None of these

D. 1/6th
840. The size of one degree of Celsius is equal to_________________?
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A. 1.8 degrees of Fahrenheit scale

B. 2.12 degrees of Fahrenheit scale

C. 3.2 degrees of Fahrenheit scale

D. One degree of Fahrenheit scale