physics MCQs – Page 37

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 Review each marked answer and report any item that may be outdated or unclear.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
721. When X-rays are passed through successive aluminum sheets what happens to their thickness ?
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A. sometimes increases and sometimes decreases

B. it decreases

C. increases

D. it remains same
722. A force applied on a body through the string is called_________?
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A. Momentum

B. Tension

C. Torque

D. Weight

723. For the successful operation of Heat engine which condition should be met ?
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A. cyclic process

B. operated at certain temperature difference

C. both A and B

D. none of these

724. Tesla is the unit for measuring:
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A. Magnetic intensity

B. Magnetic induction

C. Magnetic moment

D. None of the above

725. The rectangular voltage is an example of____________________?
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A. Continuous wave form

B. An analogue waveform

C. Electronic waveform

D. A digital waveform
726. The synopsis of Einsteins equation E = mc is that
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A. The faster you move, the heavier you get

B. None of the above

C. The faster you move, the lighter you get

D. The slower you move, the heavier you get

727. The velocity of an oscillating charge as it moves to and fro along a wire is always_____________?
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A. changing

B. infinite

C. zero

D. constant

728. A bird sitting on a high tension electric wire does not get electrocuted because:
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A. the body is earthed

B. it does not form a closed path for the flow of current

C. Sit has high resistance

D. its feet are good insulators

729. In which process all the heat supplied is converted into work done ?
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A. isentropic

B. isochoric

C. isothermal

D. isobaric

730. Neutron was discovered by: _________?
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A. Einstein

B. Neil Bohr

C. Chadwick

D. Rutherford

731. Wave-like characteristic of electron is demonstrated by______________?
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A. Photoelectric effect

B. Line spectrum of atoms

C. Production of x-rays.

D. Diffraction by crystalline solids
732. Which of the following is true ?
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A. Paschen series is a line spectrum in the infra red.

B. the spectral series formula can be derived from the Rutherford model of the hydrogen atom.

C. Lyman series is a continuous spectrum.

D. Balmer series is a line spectrum in the ultraviolet.

733. Boltzman constant K in terms of universal gas constant R and Avagadros number Na is give as_______________?
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A. K = nRNa

B. K = RNa

C. K = R/Na

D. K = Na/Ra

734. The working of transistor as amplifier is similar to________________?
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A. Step up transformer

B. Three diodes in common

C. Step down transformer

D. Triode vacuum tube
735. Standard condition STP refer to a gas at ___________________?
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A. 760mm 273K

B. 1atm 273K

C. all of the above

D. 76cm 0C

736. In p-n-p transistor the collector current is________________?
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A. greater than emitter current

B. equal to emitter current

C. any of above

D. slightly less than emitter current
737. The power is the dot product of ___________ quantities.
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A. None of these

B. Force and speed

C. Force and velocity

D. Force and time

738. An OP-AMPs can amplify_______________?
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A. D.C.

B. A.C.

C. Both A.C. & D.C.

D. None of the above

739. Two parallel beams of positrons moving in the same direction will________?
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A. not interact with each other

B. attract each other

C. be deflected normal to the plane containing the two beams.

D. repel each other
740. The internal energy of the system increases__________?
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A. in isothermal expansion

B. in adiabatic expansion

C. in adiabatic compression

D. in isothermal compression