physics MCQs – Page 16

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 Review each marked answer and report any item that may be outdated or unclear.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
301. A 100F capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?
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A. 32?

B. 50?

C. 62?

D. 100?

302. Light on passing through a Polaroid is ___________________?
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A. circularly polarized

B. elliptically polarized

C. un-polarized

D. plane polarized
303. On a clear day at noon the solar energy reaching the earth is ____________________?
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A. 1.44kw/m2

B. 1 kw/m2

C. 1.4kw/m2

D. none

304. Which of the following types of force can do no work on the particle on which it acts ?
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A. elastic force

B. frictional force

C. centripetal force

D. gravitational force

305. Work done on the body equals to the _____________________?
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A. change in its K.E and change in its P.E

B. neither change in K.E and nor change in its P.E

C. change in its P.E always

D. change in its K.E always

306. The dimension of power is_______________?
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A. none of these

B. [ML2T-3]

C. [ML2T3]

D. [ML2T-2]

307. The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?
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A. 180

B. 60

C. 45

D. 30

308. A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
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A. F=1/Bsin?

B. F=1/B

C. F=1/Bcos?

D. F/0
309. If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________?
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A. 1600 ms-1

B. 2263ms-1

C. 50.6 ms-1

D. 71.6 ms-1

310. Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?
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A. Each increase

B. One increases whereas that in the other decreases

C. Each decrease

D. Each remains the same

311. A completely filled band is called__________________?
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A. Core band

B. Valence band

C. Conduction band

D. Forbidden band

312. Which one of the following is not an electromechanical instrument ?
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A. ammeter

B. galvanometer

C. voltmeter

D. AC transformer and DC generator
313. Which experiment shows that wavelength of light is smaller than that of sound___________________?
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A. Interference

B. Diffraction

C. Reflection

D. Polarization

314. A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
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A. 5 volt

B. 0.4 volt

C. 4 volt

D. 2 volt
315. Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?
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A. Proton

B. electron

C. a-particle

D. neutron

316. The source of geothermal energy is___________________?
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A. residual lost of the earth

B. all as said in A B and C

C. decay of radioactive element in the earth

D. compression of material in the earth

317. The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?
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A. helix

B. a circle

C. an ellipse

D. a spiral

318. Waves emitted from the antenna are__________________?
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A. Electromagnetic waves

B. Sound waves

C. Radio waves

D. Modulated waves

319. When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
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A. a straight line along its initial direction

B. a straight line parallel to the field

C. a parabola in a plane perpendicular to the field

D. a circle in a plane perpendicular to the field
320. When a force is applied at one end of an elastic wire it produces at strain ? in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?
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A. 2Y?

B. Y?

C. Y?2

D. Y?/2