physics MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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