Physics

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Showing 1351 to 1375 of 1648 questions (page 55 of 66).

1351. In an isochoric process, the work done by the gas is

A. negative B. equal to the heat supplied C. P delta V D. nRT E. zero

1352. The triple point of water is

A. 100 K B. 273.16 K C. 273.15 K D. 0 K E. 373.15 K

1353. A heat engine cannot have an efficiency of 100 per cent because

A. some heat must always be rejected to the sink B. the first law forbids it C. the working substance has mass D. friction is unavoidable in practice only E. fuel is limited

1354. The force between two charges placed in a medium of relative permittivity 4 compared with that in vacuum becomes

A. half B. twice C. unchanged D. one quarter E. four times

1355. The electric potential at distance r from a point charge q is

A. kq r2 B. kqr C. kq/r D. kq/r2 E. kr/q

1356. One electron volt is equal to

A. 1.6 x 10^19 J B. 1.6 x 10^-19 J C. 1 J D. 9.1 x 10^-31 J E. 6.63 x 10^-34 J

1357. The charge stored on a 2 microfarad capacitor charged to 100 V is

A. 2 x 10^-6 C B. 2 C C. 200 C D. 2 x 10^-4 C E. 2 x 10^-2 C

1358. Three capacitors of 2 microfarad each are connected in parallel. The equivalent capacitance is

A. 6 microfarad B. 0.67 microfarad C. 8 microfarad D. 2 microfarad E. 4 microfarad

1359. The electric field between two large parallel plates carrying equal and opposite charges is

A. radial B. inversely proportional to the separation squared C. uniform D. proportional to the distance from a plate E. zero

1360. The work done in moving a charge along an equipotential surface is

A. negative B. maximum C. infinite D. equal to qV E. zero

1361. One ampere is equivalent to

A. one joule per coulomb B. one volt per ohm second C. one coulomb per second D. one watt per volt second E. one coulomb per volt

1362. The power dissipated when 2 A flows through a 5 ohm resistor is

A. 0.4 W B. 40 W C. 2.5 W D. 10 W E. 20 W

1363. The terminal potential difference of a cell is less than its emf when

A. current is drawn from the cell B. the cell is being charged C. the external resistance is infinite D. the internal resistance is zero E. no current flows

1364. Below its critical temperature, the electrical resistance of a superconductor is

A. slightly reduced B. very large C. temperature dependent and rising D. zero E. negative

1365. In a series circuit, the quantity that is the same through every component is

A. resistance B. charge stored C. potential difference D. power E. current

1366. The direction of force on a current carrying conductor in a magnetic field is given by

A. Fleming's left hand rule B. Fleming's right hand rule C. Coulomb's law D. Lenz's law E. the corkscrew rule for potential

1367. A charged particle of mass m and charge q entering a magnetic field B perpendicularly with speed v moves in a circle of radius

A. mvB/q B. mv/qB C. qvB/m D. qB/mv E. mq/vB

1368. Two parallel wires carrying current in the same direction

A. exert no force B. attract only if the currents are unequal C. rotate about each other D. repel each other E. attract each other

1369. Faraday's law of induction states that the induced emf is proportional to the

A. current in the coil B. resistance of the coil C. rate of change of magnetic flux D. magnetic flux E. area of the coil only

1370. The peak emf produced by an AC generator with N turns, area A, rotating at angular frequency omega in field B is

A. NAB/omega B. NA omega C. AB omega D. NAB omega E. NAB

1371. The back emf in a DC motor is greatest when the motor is

A. disconnected B. just switched on C. reversed D. stalled E. running at full speed

1372. A step down transformer has 1000 turns in the primary and 100 in the secondary. If the primary voltage is 220 V, the secondary voltage is

A. 22 V B. 220 V C. 2.2 V D. 110 V E. 2200 V

1373. The negative sign in Faraday's law expresses

A. Gauss's law B. Lenz's law C. Ohm's law D. Ampere's law E. Coulomb's law

1374. Mutual inductance between two coils depends on

A. the current in the primary only B. the resistance of the secondary C. the voltage applied D. the relative geometry and number of turns of the coils E. the frequency of the supply only

1375. The impedance of a series RLC circuit is

A. R + XL + XC B. sqrt(R2 + XL2 + XC2) C. sqrt(R2 + (XL - XC)2) D. R (XL - XC) E. R - XL + XC

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