physics MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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
401. For chain reaction to build up the size of the radioactive target should be______________?
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A. Less than the critical size

B. Greater than the critical size

C. Equal to the critical size

D. All of above can build up a change reaction

402. Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of_______________?
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A. ?-rays

B. B and C have equal antiseptic propertie

C. ?-rays

D. ?-rays

403. The direction of a vector in space is specified by_______________?
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A. Two angle

B. No angle

C. One angle

D. Three angle
404. Materials that undergo plastic deformation before breaking are called __________________?
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A. Polymers

B. Brittle

C. Ductile

D. Amorphous

405. The area under the force displacement graph represents__________________?
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A. none of these

B. area

C. work done

D. power

406. Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
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A. BINA

B. BINA tana

C. BINA sina

D. BINA cosa

407. An A.C series circuit containing 4? resistance and 3? inductive reactance. The impedance of the circuit is______________?
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A. 7?

B. 5?

C. 7?

D. 1?

408. If a current carrying solenoid is suspended freely it will__________________?
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A. be rotating

B. comes to rest after rotation

C. come to rest in N-S direction

D. vibrating like galvanometer needle

409. Ammeter connected in an AC circuit measures______________?
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A. The peak value of the current

B. The exact value of the current

C. RMS value of the current

D. The net value of the current

410. During an encounter with an atom alpha particle knocks out ______________?
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A. Nothing

B. Electrons

C. Neutrons

D. Protons

411. Which one is not correct for a vector A= 2i+2j+3k ?
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A. Has magnitude 2

B. Has direction 45 with an x-axis

C. Has magnitude 2 and direction =45 with a y-axis

D. Has magnitude -2
412. The equation of continuity is obtained by applying in the law of conservation of_____________?
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A. Momentum

B. All

C. Energy

D. Mass
413. Unit of G is ______________?
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A. Nm2Kg

B. Nm2Kg2

C. None

D. Nm2Kg-2

414. Coefficient of viscosity of honey is greater than______________?
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A. Charcoal

B. Water

C. Water

D. Milk

415. In vibratory motion_________________?
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A. total momentum remains constant

B. total energy remains constant

C. P E remains constant

D. K E remain constant

416. The time period of a second pendulum is______________?
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A. 4 seconds

B. 3 seconds

C. 6 seconds

D. 2 seconds
417. Which one is venturi relation ?
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A. P1 P2 = 1/2 ?V22

B. P = 1 /2?V2 = ?gh = constant

C. V2 = 2g (h1-h2)

D. A1 V1 = A2 V2 = constant

418. The length of the second pendulum is_________________?
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A. 99 cm

B. 99.2 cm

C. 100 cm

D. 98 cm

419. Which one is the highest power multiple ?
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A. Mega

B. Deca

C. Beta

D. Giga
420. In an angular motion, Newtons second law of motion is_____________?
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A. F=ma

B. All above

C. F=?p/It

D. ?? = I ?
421. In an electron microscope, we use energetic particles because of______________?
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A. Wavelength is very short

B. All the above reasons

C. Kinetic energy is large

D. Penetrating power is high

422. The linear momentum of an X-ray photon of wavelength 0.1A is_______________?
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A. data is insufficient

B. 6.625x1023N-s

C. 66.25x1023N-s

D. 662.5x1023N-s

423. Minimum number of communication satellites required to cover the whole earth is______________?
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A. 5

B. 2

C. 3

D. 4

424. S.I unit of frequency is_________________?
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A. Vibration S-2

B. Hertz

C. Radian

D. ms-1

425. The sharpness of resonance is__________________?
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A. Equal to the square of damping force

B. Inversely proportional to the damping force

C. Directly proportional to the damping force

D. Equal to the square of damping force

426. Reverse process of photoelectric effect is_______________?
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A. annihilation of matter

B. X-rays production

C. Compton effect

D. pair production

427. In damped harmonic oscillation which one decreases ?
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A. Amplitude of vibration

B. Energy of vibration

C. Both amplitude and energy

D. Neither amplitude nor energy

428. The total energy of a body executing S.H.M is directly proportional to________________?
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A. The square root of amplitude

B. Square of an amplitude

C. The amplitude

D. Reciprocal of amplitude

429. The existence of Ether wind was experimentally rejected by__________________?
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A. infinite

B. equal to its rest mass

C. zero

D. double of its rest mass

430. Who discovered the inverse square law for gravity ?
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A. Galileo

B. Plank

C. Newtons

D. Einstein

431. Dimensional analysis is helpful for__________________?
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A. Deriving a possible formula

B. Verification of laws

C. Only A and B are correct

D. Checking the homogeneity of a physical equation

432. The number 76.85 is rounded off up to two significant figures as_____________?
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A. 77

B. 76.9

C. 76.8

D. None of these

433. Final image produced by a compound microscope is_____________?
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A. virtual and erect

B. real and inverted

C. virtual and inverted

D. real and erect

434. Laminar flow usually occurs at speeds_____________?
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A. Very high

B. Low

C. High

D. Some time high and some time low

435. In the electron microscope, electric & magnetic fields are used as_______________?
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A. Source of electromagnetic waves

B. Deflecting charged particle

C. Electromagnetic gun

D. Converging source of electrons
436. Bracket series is obtained when all transition of electron terminate on_______________?
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A. 4th orbit

B. 5th orbit

C. 2nd orbit

D. 3rd orbit

437. The displacement of SHM is written as X = X`sin?t if the displacement is written by X = X? sont then phase constant will be equal to_______________?
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A. 45

B. 90

C. 0

D. 180

438. The natural frequency of simple pendulum depends upon_______________?
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A. The square root of its length

B. Its length

C. Square of its length

D. Its mass

439. To reduce the uncertainty in the timing experiment______________?
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A. Highly precise instrument

B. Conduct at room temperature

C. Count number of vibration

D. Both a and C
440. In S.H.M. the velocity of a particle is maximum at________________?
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A. middle between the mean and extreme position on the right side

B. mean position

C. middle between the mean and extreme position on the left side

D. extreme position

441. In scientific notation, numbers are expressed in________________?
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A. Decimal

B. Reciprocal

C. Powers of two

D. Power of ten
442. Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to_______________?
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A. Division of their absolute uncertainties

B. Sum of their absolute uncertainties

C. The difference of their absolute uncertainties

D. The product of their absolute uncertainties

443. Davison Germer experiment indicates__________________?
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A. Polarization

B. Refraction

C. Electron diffraction

D. Interference

444. Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?
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A. focus

B. f/2

C. 2 f

D. zero

445. Blood vessels are______________?
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A. Not rigid

B. Rigid

C. Of rubber

D. Of glass

446. The energy of SHM is maximum at_______________?
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A. Mean position

B. In between mean and extreme

C. All positions during SHM

D. Extreme position

447. Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ?
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A. Only (i)

B. Only (ii)

C. Only (iii)

D. Both (i) and (ii)

448. Michelson calculated the speed of light using the instruments______________?
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A. galvanometer

B. interferometer

C. spectrometer

D. none of these

449. Einsteins photoelectric equation is given by_______________?
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A. 1/2 mvmax2-hf = ?

B. All of above are correct

C. 1/2 mvmax2=hf+?

D. 1/2 mvmax2=hf-?
450. How many types of units are in SI ?
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A. 4

B. 1

C. 3

D. 2