physics MCQs – Page 18

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 Review each marked answer and report any item that may be outdated or unclear.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

341. The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?
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A. Sinusoidal current

B. r.m.s current

C. Average current

D. Net current

342. n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
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A. V = VR+VL+VC

B. V2 = VR2+VL2+VC2

C. V2 = VR2+(VL-VC)2

D. V2 = VL2+(VR-VC)2

343. An alpha particle can produce fluorescence in__________________?
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A. Barium platinocyanide

B. Calcium tungstate

C. All of above

D. ZnS

344. Which one of the following radiation possesses maximum penetrating power ?
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A. All have the equal penetrating powe

B. B-rays

C. ?-rays

D. X-rays

345. Which of the following is not conservative force_________________?
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A. gravitational

B. electric

C. friction

D. magnetic

346. Torque is defined as______________?
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A. Cross product of position vector and force

B. Turning effect of force

C. All A, B and C are correct

D. Product of force and moment arm

347. In the capacitive circuit the current___________________?
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A. Is in phase with voltage

B. Lags behind voltage by ?/2

C. Leads forward the voltage by ?/2

D. Opposite in phase of voltage by ?

348. In a semiconductors the charge carriers are ___________________?
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A. Electrons only

B. All of the above

C. Holes only

D. Electron and holes both

349. A 10? electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
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A. 220 ?2V

B. 110V

C. 220/ 2V

D. 220V

350. A changing magnetic flux produces around itself an induced_______________?
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A. Electric field

B. Artificial gravitational field

C. Electromagnetic force

D. Magnetic field

351. A magnetic field___________________?
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A. never exerts a force on a charged particles

B. exerts a force if the charged particle is moving in the direction of the magnetic field lines

C. always exerts a force on a charged particle

D. exerts a force if the charged particle is moving perpendicular to the magnetic field lines

352. A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
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A. 200 mA

B. 20 mA

C. 0.2 mA

D. 2.0 mA

353. Slope of work time graph is equal to____________________?
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A. acceleration

B. power

C. energy

D. displacement

354. The cross product i^ x j^ is equal to_______________?
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A. One

B. k^

C. Zero

D. i^

355. If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
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A. ? = NIAB

B. ? = NIAB cos?

C. ? = NIAB sin?

D. ? = NIAB tan?

356. The source of tidal energy is____________________?
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A. sun

B. earth

C. both A and B

D. moon

357. Electromagnetic waves emitted from antenna are________________?
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A. Transverse

B. Stationary

C. Longitudinal

D. All the above

358. Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
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A. magnetic induction

B. magnetic field intensity

C. self inductance

D. magnetic flux

359. Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
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A. Newton

B. Michelson

C. Galileo

D. Einstein

360. Electromagnetic waves transport___________________?
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A. Momentum

B. Energy

C. Heat

D. Mass

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