physics Mcqs
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

361. The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
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A. 60

B. 120

C. 90

D. 30

362. When two protons are brought together_____________________?
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A. P.E. between them decreases

B. P.E. between tem does not change

C. P.E. between them increases

D. Kinetic energy increases

363. A body will be in complete equilibrium when it is satisfying______________?
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A. 1st condition of equilibrium

B. 2nd condition of equilibrium

C. Both Ist and 2nd condition of equilibrium

D. Impossible

364. An alpha particle in a single encounter__________________?
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A. Loses all of its energy

B. Losses most of its energy

C. Loses no energy at all

D. Loses a small fraction of its energy

365. Neutron and proton are commonly known as______________?
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A. Meson

B. Nucleon

C. Boson

D. Quartz

366. An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?
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A. 224 84

B. 222 86

C. 220 80

D. 226 87

367. Which one has the greatest energy gap ?
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A. Semi conductor

B. Conductor

C. Metals

D. Non metals
368. The cross product of two vectors is a negative vector when______________?
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A. They are parallel vectors

B. They are anti parallel vectors

C. They are a perpendicular vector

D. They are rotated through 270
369. What is the angle that the given vector makes with y-axis and A=2i+3j ?
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A. 90

B. 60

C. 120

D. 30

370. A thing that emits its own light is___________________?
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A. incandescent

B. luminous

C. bright

D. non-luminous

371. Addition of vector obeys_____________?
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A. Commutative law

B. All given laws in A, B and C

C. Distributive law

D. Associative law

372. The penetration power of alpha particle as compared to beta particle is_______________?
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A. 10 times less

B. 100 times less

C. 100 times more

D. 10 times more

373. Which of the following substances posses the highest elasticity ?
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A. Copper

B. Rubber

C. Steel

D. Glass

374. When A.C current passes through a capacitor then the current relationship will be_______________?
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A. The voltage leads current by phase angle is 90 degrees

B. The current lead voltage by phase angle is 45 degrees

C. The current lead voltage by phase angle is 90 degrees

D. The voltage leads current by phase angle is 45 degrees

375. Ina liquid metal fast breeder reactor, the type of uranium used is______________?
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A. 92U235

B. 92U239

C. 92U238

D. 92U234

376. What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
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A. 0.5 mH

B. 0.5H

C. 8.0H

D. 2.0H

377. One mega watt hour is equal to_________________?
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A. 36 x 1012 J

B. 36 x 108 J

C. 36 x 106 J

D. 36 x 109 J

378. Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
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A. current sensitivity

B. 0.1 A

C. 1 m A

D. 1:00 AM

379. A wheat stone bridge is said to be balanced when____________________?
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A. minimum current flows through the galvanometer branch

B. maximum current flows through the galvanometer branch

C. potential difference across galvanometer branch is maximum

D. potential difference across galvanometer branch is zero
380. A uniform steel wire of length 4m and area of cross-section 310-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 21011 Nm-2 the energy stored in the wire is___________________?
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A. 0.025J

B. 0.50J

C. 0.100J

D. 0.75J
381. An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10? resistor. The peak current is then ?
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A. 20A

B. 20.66A

C. 6.66A

D. 5.66A
382. The standard vector symbol for flux density is ____________________?
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A. B

B. H

C. M

D. L
383. Which one of the following material is most suitable for making core of an electromagnet ?
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A. air

B. soft iron

C. steel

D. Cu-Ni alloy

384. What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
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A. 1A

B. 1000A

C. 10A

D. 100A
385. Alpha particle ionizes an atom_________________?
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A. Through electrostatic attraction

B. Through electrostatic repulsion

C. Through direct collision

D. All of above

386. Magnetic flux and flux density are related by___________________?
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A. magnetic flux = flux density / area

B. flux density = magnetic flux x area

C. flux density = magnetic flux area

D. magnetic flux = flux density x area
387. An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
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A. E = BeV

B. E = BV

C. B = eE/V

D. E = BeV/2

388. The unit of radioactivity curie is equal to_________________?
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A. 3.60 x 1010 disintegration per sec

B. 3.70 x 1010 disintegration per sec

C. 3.74 x 109 disintegration per sec

D. 3.55 x 1010 disintegration per sec

389. While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
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A. a most sensitive galvanometer is used

B. a steady voltage cell is used

C. a high resistance box is used in one of its gap

D. the balance point is close to the middle of the wire
390. Work done will be maximum if the angle between the force F and displacement d is______________________?
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A. 180

B. 90

C. 45

D. 0
391. During fusion of hydrogen into helium________________?
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A. Energy is absorbed

B. Mass is increased due to energy absorption

C. Energy is released

D. Mass is reduced due to the energy released

392. The dimension of torque is______________?
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A. [ML2T-2]

B. [ML-2T-2]

C. [MLT-2]

D. [ML2T]

393. In simple cube one atom or molecule lies at its______________________?
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A. Force corners

B. Nine corners

C. Eight corners

D. Six corners

394. Coercive force is the force which opposes ____________________?
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A. Demagnetization

B. Surface cracking

C. Breakage

D. Extension

395. Work done by the force of friction is____________________?
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A. positive only for small frictional force

B. always positive

C. positive only for large frictional force

D. always negative
396. The energy liberated when one atom of U-235 undergoes fission reaction is________________?
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A. 200MeV

B. 40MeV

C. 20MeV

D. 30MeV

397. Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then_____________?
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A. B is anti-parallel to A

B. B is a negative vector of A

C. B is perpendicular to A

D. B has a negative magnitude

398. Diffraction fringes are____________________?
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A. distance between then decreases

B. they are adjacent with no space in between

C. equally spaced

D. distance between them increases

399. Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?
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A. Parallel

B. Concurrent

C. Non-parallel

D. Non-concurrent

400. The energy band occupied by the valence electrons is called___________________?
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A. conduction band

B. Energy state

C. Valence band

D. ve energy state