physics MCQs – Page 12

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 Review each marked answer and report any item that may be outdated or unclear.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

221. A galvanometer basically is an instrument used to ____________________?
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A. measure voltage across a circuit

B. measure current flowing through a circuit

C. detect current in a circuit

D. measure potential difference between two points in a circuit

222. Two parallel wires carrying currents in the opposite directions____________________?
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A. have no effect upon each other

B. repel each other

C. they cancel out their individual magnetic fields

D. attract each other

223. A capacitor of capacitance 30F is charged by a constant current of 10mA. If initially, the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V ?
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A. 0.9sec

B. 0.9x102sec

C. 1.5x105sec

D. 15 sec

224. If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
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A. One half

B. None

C. Twice

D. Four times

225. The relation between the escape velocity V esc and orbital speed Vo is given by________________?
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A. V esc = -2 Vo

B. V esc = Vo

C. V esc = 2Vo

D. V esc = 1/2Vo

226. An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?
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A. I = 2I?Sin(?t/2)

B. I = 2ISin?t

C. I = I?sin(2?t)

D. I = 2I?Sin(2?t)

227. Torque acting on a body determines_______________?
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A. Acceleration

B. Linear acceleration

C. Direction of motion of the body

D. Angular acceleration

228. A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
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A. independent mass m

B. directly proportional to m

C. directly proportional to q

D. directly proportional to B

229. Galvanometer is a very sensitive device with______________________?
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A. very low damping

B. no damping at all

C. radial field disintegration

D. very high damping

230. When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?
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A. R=qmV/B

B. R=mV/qB

C. R=qmB/V

D. R=qB/mV

231. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
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A. (F1+F2) (121+122)

B. (F1+F2) (12-11)

C. (F1+F2) (12-11)

D. (F1+F2) (122-112)

232. Various types of cancer are treated by_________________?
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A. Nickel-63

B. Cobalt-60

C. Strontium-90

D. Carbon-14

233. If the density of atoms remain same along any direction in a crystal is called__________________?
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A. Symmetry

B. Isotropy

C. Cleavage

D. Homogeneity

234. The rectangular coordinate system is also called______________?
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A. Cylindrical coordinate system

B. Polar coordinate system

C. Cartesian coordinate system

D. Spherical coordinate system

235. Heating a magnet will ____________________?
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A. demagnetize it completely

B. weaken it

C. strengthen it

D. reverse its polarity

236. The escape velocity form the earth surface in km S-1 is____________________?
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A. 1.1 km S-1

B. 4.2 km S-1

C. 7.5 km S-1

D. 9.5 km S-1

237. T.V sets and microwave ovens emit ___________________?
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A. ?-rays

B. X-rays

C. ?-rays

D. ?-rays

238. Radioactive decay obeys which one of the following law ?
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A. N=Noe-?t

B. N=Noe?t

C. No=N(1+e?t)

D. N=Noe-?t/2

239. Pair production takes place in the vicinity of a heavy nucleus so that_____________?
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A. Net energy is conserved

B. All of the above

C. Net momentum is conserved

D. Net charge is conserved

240. Maximum number of rectangular components are_____________?
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A. 1

B. 4

C. 3

D. 2

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