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Showing 1426 to 1450 of 3046 questions (page 58 of 122).

1426. The value of the universal gas constant R in SI units is

A. 0.083 B. 8.314 C. 62.4 D. 1.987 E. 0.0821

1427. The first law of thermodynamics is a statement of the conservation of

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

1428. For an isothermal expansion of an ideal gas, the change in internal energy is

A. positive B. negative C. equal to the heat absorbed times gamma D. equal to the work done E. zero

1429. For one mole of an ideal gas, Cp - Cv equals

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

1430. The efficiency of a Carnot engine operating between temperatures T1 (source) and T2 (sink) is

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

1431. A Carnot engine works between 500 K and 300 K. Its efficiency is

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

1432. In an adiabatic process

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

1433. For any spontaneous natural process, the entropy of the universe

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

1434. The value of the Coulomb constant 1/(4 pi epsilon_0) in SI units is about

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

1435. The electric field intensity inside a hollow charged conductor in electrostatic equilibrium is

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

1436. The capacitance of a parallel plate capacitor with plate area A and separation d in vacuum is

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

1437. Three capacitors of 3 microfarad each are connected in series. The equivalent capacitance is

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

1438. The energy stored in a capacitor of capacitance C charged to potential difference V is

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

1439. Inserting a dielectric slab between the plates of a capacitor at constant charge

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

1440. Gauss's law relates the electric flux through a closed surface to

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

1441. Kirchhoff's first rule is based on the conservation of

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

1442. A Wheatstone bridge is balanced when

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

1443. 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

1444. Maximum power is delivered by a cell of emf E and internal resistance r to an external resistance R when

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

1445. The specific resistance of a conductor depends on

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

1446. Two resistances of 6 ohm and 3 ohm are connected in parallel. The equivalent resistance is

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

1447. The force on a charge q moving with velocity v at angle theta to a magnetic field B is

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

1448. The magnetic field inside a long solenoid with n turns per unit length carrying current I is

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

1449. The SI unit of magnetic flux is

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

1450. A charged particle moving parallel to a uniform magnetic field experiences a force of

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

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