physics MCQs – Page 19

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 Review each marked answer and report any item that may be outdated or unclear.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