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Showing 1451 to 1475 of 1648 questions (page 59 of 66).

1451. The specific heat capacity of a substance is the heat required to raise the temperature of

A. unit mass by 1 K B. one mole by 1 K C. unit volume by 1 K D. unit mass by 100 K E. the whole body by 1 K

1452. The latent heat of fusion of ice is about

A. 100 J g-1 B. 33.6 J g-1 C. 336 J g-1 D. 2260 J g-1 E. 4.18 J g-1

1453. A Carnot engine working between 400 K and 300 K has an efficiency of

A. 30% B. 75% C. 20% D. 33% E. 25%

1454. According to the Kelvin statement of the second law, it is impossible to construct an engine that

A. rejects heat to a sink B. converts all the heat absorbed from a single reservoir into work C. uses a gas as working substance D. has an efficiency of 50 per cent E. operates in a cycle

1455. Electric charge exists only in integral multiples of the electronic charge. This is called

A. Coulomb's law B. Gauss's law C. conservation of charge D. quantization of charge E. the superposition principle

1456. Two electric field lines can never intersect because

A. the field would be zero there B. the field would have two directions at one point C. the lines are imaginary D. charges repel E. the field is conservative

1457. The force between two charges of 1 coulomb each placed 1 metre apart in vacuum is

A. 8.85 x 10^-12 N B. 1.6 x 10^-19 N C. 9 x 10^9 N D. 1 N E. 9 x 10^-9 N

1458. For capacitors connected in series, the quantity that is the same on each is the

A. potential difference B. stored energy C. dielectric constant D. capacitance E. charge

1459. The relation between electric field intensity and potential is

A. E = V/r2 B. V = E r2 C. E = V r D. E = -dV/dr E. E = dV/dr times r2

1460. Two resistors of 4 ohm and 6 ohm are joined in series across a 20 V supply. The current is

A. 1.2 A B. 0.5 A C. 2 A D. 10 A E. 5 A

1461. An ideal ammeter and an ideal voltmeter have respectively

A. equal finite resistances B. zero and infinite resistance C. zero and zero resistance D. infinite and infinite resistance E. infinite and zero resistance

1462. A galvanometer is converted into an ammeter by connecting

A. a capacitor in series B. an inductor in series C. a high resistance in series D. a diode in parallel E. a low resistance in parallel

1463. The heat produced in a resistor is given by

A. I2Rt B. I2R/t C. IRt2 D. IR2t E. IRt

1464. The resistance of a conductor of length L, area of cross section A and resistivity rho is

A. L / rho A B. rho A / L C. A / rho L D. rho L / A E. rho L A

1465. In the resistor colour code, the fourth band indicates

A. the temperature coefficient B. the multiplier C. the first digit D. the tolerance E. the power rating

1466. The magnetic field at a perpendicular distance r from a long straight wire carrying current I is

A. 2 pi mu_0 I r B. mu_0 I / (2 pi r) C. mu_0 I / (2r) D. mu_0 I / r2 E. mu_0 I r

1467. The force on a 2 m length of wire carrying 3 A placed perpendicular to a 0.5 T field is

A. 12 N B. 0.75 N C. 3 N D. 1.5 N E. 6 N

1468. A loudspeaker converts electrical energy into sound using

A. piezoelectric heating only B. the photoelectric effect C. electrostatic attraction D. thermal expansion E. the force on a current carrying coil in a magnetic field

1469. A diamagnetic substance in a magnetic field is

A. weakly repelled B. weakly attracted C. unaffected D. strongly attracted E. permanently magnetized

1470. Flux linkage through a coil of N turns each enclosing flux Phi is

A. Phi/N B. N Phi C. Phi D. N2 Phi E. N/Phi

1471. A generator converts

A. light to electrical energy B. heat to electrical energy C. chemical to electrical energy D. mechanical energy to electrical energy E. electrical energy to mechanical energy

1472. Self induction in a coil always

A. opposes the change in current B. assists the change in current C. reverses the current D. increases the resistance E. stops the current

1473. A transformer with 500 primary turns and 2500 secondary turns supplying 220 V to the primary gives a secondary voltage of

A. 44 V B. 550 V C. 220 V D. 2500 V E. 1100 V

1474. The peak to peak value of an alternating voltage of peak value V0 is

A. V0/sqrt(2) B. V0/2 C. V0 D. 2V0 E. V0 sqrt(2)

1475. A radio receiver is tuned to a station by adjusting the

A. capacitance of the tuning circuit B. supply voltage C. aerial length only D. loudspeaker impedance E. resistance in the circuit

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