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Showing 1226 to 1250 of 1648 questions (page 50 of 66).

1226. For one mole of an ideal gas, Cp - Cv equals

A. R B. R/2 C. gamma R D. 2R

1227. The efficiency of a Carnot engine operating between temperatures T1 (source) and T2 (sink) is

A. 1 - T2/T1 B. T2/T1 C. T1/T2 D. 1 - T1/T2 E. T1 - T2

1228. A Carnot engine works between 500 K and 300 K. Its efficiency is

A. 80% B. 30% C. 20% D. 40% E. 60%

1229. In an adiabatic process

A. temperature remains constant B. internal energy remains constant C. pressure remains constant D. volume remains constant E. no heat enters or leaves the system

1230. For any spontaneous natural process, the entropy of the universe

A. becomes zero B. decreases C. increases D. remains constant E. becomes negative

1231. The value of the Coulomb constant 1/(4 pi epsilon_0) in SI units is about

A. 9 x 10^9 B. 8.85 x 10^-12 C. 3 x 10^8 D. 1.6 x 10^-19 E. 6.63 x 10^-34

1232. The electric field intensity inside a hollow charged conductor in electrostatic equilibrium is

A. infinite B. zero C. maximum D. equal to the surface field E. uniform and non-zero

1233. The capacitance of a parallel plate capacitor with plate area A and separation d in vacuum is

A. d / epsilon_0 A B. epsilon_0 A d C. epsilon_0 A / d D. epsilon_0 d / A E. A d / epsilon_0

1234. Three capacitors of 3 microfarad each are connected in series. The equivalent capacitance is

A. 0.33 microfarad B. 3 microfarad C. 6 microfarad D. 9 microfarad E. 1 microfarad

1235. The energy stored in a capacitor of capacitance C charged to potential difference V is

A. CV B. C2V C. (1/2)CV D. (1/2)CV2 E. CV2

1236. Inserting a dielectric slab between the plates of a capacitor at constant charge

A. decreases the capacitance B. increases the electric field C. has no effect D. increases the capacitance E. increases the potential difference

1237. Gauss's law relates the electric flux through a closed surface to

A. the surface area B. the field at the surface only C. the volume enclosed D. the potential at the centre E. the charge enclosed

1238. Kirchhoff's first rule is based on the conservation of

A. flux B. charge C. momentum D. energy E. mass

1239. A Wheatstone bridge is balanced when

A. R1 R3 = R2 R4 B. R1 R2 = R3 R4 C. R1/R2 = R3/R4 D. the galvanometer reads maximum E. R1 + R2 = R3 + R4

1240. The resistance of a thermistor with a negative temperature coefficient

A. is independent of temperature B. varies linearly with current C. increases with temperature D. becomes zero at 0 K E. decreases with temperature

1241. Maximum power is delivered by a cell of emf E and internal resistance r to an external resistance R when

A. R = 2r B. R = 0 C. R = r D. R = r/2 E. R is infinite

1242. The specific resistance of a conductor depends on

A. its shape B. the nature of the material and temperature C. its area of cross section D. its length E. the current through it

1243. Two resistances of 6 ohm and 3 ohm are connected in parallel. The equivalent resistance is

A. 18 ohm B. 3 ohm C. 9 ohm D. 2 ohm E. 4.5 ohm

1244. The force on a charge q moving with velocity v at angle theta to a magnetic field B is

A. qvB sin theta B. qvB tan theta C. qvB cos theta D. qv/B E. qB/v

1245. The magnetic field inside a long solenoid with n turns per unit length carrying current I is

A. mu_0 n / I B. n I / mu_0 C. mu_0 I / n D. mu_0 I E. mu_0 n I

1246. The SI unit of magnetic flux is

A. weber B. henry C. gauss D. ampere turn E. tesla

1247. A charged particle moving parallel to a uniform magnetic field experiences a force of

A. qvB B. maximum magnitude C. half the maximum D. zero E. qE

1248. Ampere's circuital law relates the line integral of the magnetic field around a closed loop to

A. the enclosed charge B. the enclosed current C. the loop area D. the flux through the loop E. the emf induced

1249. Lenz's law is a consequence of the conservation of

A. flux B. momentum C. energy D. mass E. charge

1250. The motional emf induced in a rod of length l moving with velocity v perpendicular to a magnetic field B is

A. B/vl B. B2vl C. Bl/v D. Bvl E. Bv/l

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