physics MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
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A. Instantaneous values of voltage and current

B. All of the above

C. Peak values of voltage and current

D. Effective values of voltage and current

282. An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
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A. 3.5 x 104 J

B. 3.5 x 103 J

C. 3.5 x 106 J

D. 3.5 x 109 J
283. A central force is that which__________________?
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A. Cannot produce torque

B. Can produce torque

C. Has no relation with torque

D. Some time can produce torque some time cannot

284. Pair production cannot take place in a vacuum as ________ is not conserved ?
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A. MomentumB.

B. Energy

C. Charge

D. Mass

285. Gravitational P.E of a body has____________________?
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A. a formula

B. no general formula

C. a formula mgh only

D. no formula

286. The ration stress to strain in youngs modulus of the material then tension is__________________?
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A. Inversely proportional to extension

B. Directly proportional to strain

C. Directly proportional to extension

D. Directly proportional to square of amplitude

287. One AMU is equal to__________________?
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A. 1.66 x 10-27kg

B. All of above

C. 166 x 10-15ng

D. 166 x 10-20g

288. To find the r.m.s value of an alternating current mathematically we need to have ________________?
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A. Square root of mean value of I2

B. Square root of I2

C. Mean value of I2

D. Square of 1/2

289. A vector can be multiplied by a number. The number may be_______________?
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A. Negative

B. Dimensional scalar

C. Dimensionless

D. All A, B and C are correct
290. A vacant or partially filled band is called _____________________?
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A. Empty band

B. Conduction band

C. Valence band

D. Forbidden band

291. The path of alpha particle is_______________?
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A. Rectilinear

B. Curved

C. Elliptical

D. Zig-zag or erratic
292. According to which one of following law the density of atom is uniform ?
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A. J.J.Thomson model

B. All of the above laws contradict the statement

C. Bohrs model

D. Rutherfords model

293. Holes can exist in____________________?
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A. Conductors

B. Insulators

C. All of the above

D. Semi conductors
294. A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
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A. (R2+f2L2)

B. (R+2?fL)

C. (R2+4?2f2L2)

D. R+1/2?fL

295. Value of permeability of free space in SI units is___________________?
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A. 4?x10-7 WbA-1m-1

B. 4?x10-8 WbA-1m-1

C. 4?x10-9 WbA-1m-1

D. 4?x10-10 WbA-1m-1

296. An electromagnetic wave consists of _____________________?
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A. Electric and magnetic fields moving perpendicular to each other

B. Magnetic field moving with velocity of light in space

C. Electric field moving with velocity of light

D. Electric and magnetic fields moving parallel to each other

297. The direction of the vector product is given by______________?
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A. Head to tail rule

B. Left-hand rule

C. Right-hand rule

D. Triangular rule

298. Nuclear forces exist between ___________________?
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A. All of the above

B. Proton-proton

C. Neutron-neutron

D. Proton-neutron

299. Energy needed to magnetize and demagnetize is represented by _________________?
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A. Straight line

B. Hysteresis curve

C. Hysteresis loop area

D. Hysteresis loop

300. Biomass can be converted into fuels by____________________?
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A. direct combustion

B. fermentation

C. both A and B

D. none of these