physics MCQs – Page 40

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 Review each marked answer and report any item that may be outdated or unclear.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
781. What is the force of attraction between any two bodies by virtue of their masses is called?
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A. Centripetal Force

B. Electromagnetic Force

C. Gravitational Force

D. Nuclear Force

782. Oil rises up to wick in a lamp because_____________?
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A. Capillary action phenomenon

B. Oil is volatile

C. Oil is very light

D. Diffusion of oil through the wick

783. In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?
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A. Metal stable state

B. All the above

C. Normal state

D. Inverted population
784. Which instrument is suitable to measure the internal diameter of a test tube?
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A. None

B. Screw Gauge

C. Vernier Callipers

D. Bore Gauge

785. Average translational kinetic energy per molecule of an ideal gas is given by_____________?
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A. 3RT/2Na

B. 3Na/2RT

C. 2NaT/3

D. 3NaT/2R

786. Why the needle of iron swims on water surface when it is kept gently ?
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A. due to its shape

B. due to surface tension

C. It will remain under the water, when it will displace more water than its weight

D. the density of needle is less than that of water

787. In the transistor schematic symbol, the arrow_______________?
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A. is located on the emitter

B. points form north to south

C. is located on the base

D. is locate on the collector

788. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?
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A. impossible to predict

B. he/ev

C. eV/h

D. he/Vc

789. Temperature is a property which determines_________________?
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A. How much heat a body contains

B. Whether a body will feel hot or cold to touch

C. In which direction heat will flow between two systems

D. How much total absolute energy a body has

790. Gravitation force of earth is___________?
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A. 9.80 m/s

B. 7.21 m/s

C. 1.62 m/s

D. None of these

791. Which one of the following is not a radioactive element ?
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A. Radium

B. Thorium

C. Uranium

D. Cadmium
792. The Capacity of doing work is called_________?
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A. Energy

B. Work

C. Momentum

D. Power

793. CGS system of units is also called __________?
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A. None of these

B. Metric or French system of units

C. Metric system

D. Metric or British system of units

794. Which one of the following has the highest value of specific heat?
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A. Water

B. Methane

C. Kerosene

D. Alcohol

795. Mohus scale is used for to measure ____________?
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A. Hardness

B. Humidity

C. Temperature

D. Pressure

796. In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
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A. The amount of mercury use is very small

B. The capillary tube has a small constriction near the bulb

C. Mercury takes a long time to contract

D. The capillary tube is very narrow

797. Gravitation force of sun is__________?
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A. 274 m/s

B. 362 m/s

C. 300 m/s

D. None of these

798. Medium which sends signal from source to destination is known as ________ ?
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A. Hardware

B. Receiver

C. Transmitter

D. Transmission channel
799. For a gas obeying Boyles law if the pressure is doubled the volume becomes________________?
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A. one fourth

B. one half

C. double

D. four times

800. In n-p-n transistor, p works as______________?
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A. emitter

B. base

C. any of above

D. collector