Physics

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Showing 1026 to 1050 of 1648 questions (page 42 of 66).

1026. The colours of a soap bubble are produced by

A. polarization by reflection B. total internal reflection C. interference in a thin film D. dispersion E. scattering of light

1027. The overall magnification of a compound microscope is

A. the ratio of the two magnifications B. the product of the objective and eyepiece magnifications C. equal to the eyepiece magnification D. the sum of the objective and eyepiece magnifications E. independent of the eyepiece

1028. The power of a lens of focal length 50 cm is

A. 2 dioptre B. 50 dioptre C. 0.5 dioptre D. 5 dioptre E. 0.02 dioptre

1029. Astigmatism is corrected using a

A. plane mirror B. convex lens C. bifocal lens D. cylindrical lens E. concave lens

1030. Two bodies in thermal equilibrium with a third body are in thermal equilibrium with each other. This statement is the

A. first law B. zeroth law of thermodynamics C. second law D. third law E. law of heat exchange

1031. The specific heat capacity of a substance is the heat required to raise the temperature of

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

1032. The latent heat of fusion of ice is about

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

1033. A Carnot engine working between 400 K and 300 K has an efficiency of

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

1034. According to the Kelvin statement of the second law, it is impossible to construct an engine that

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

1035. Electric charge exists only in integral multiples of the electronic charge. This is called

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

1036. Two electric field lines can never intersect because

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

1037. The force between two charges of 1 coulomb each placed 1 metre apart in vacuum is

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

1038. For capacitors connected in series, the quantity that is the same on each is the

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

1039. 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

1040. Two resistors of 4 ohm and 6 ohm are joined in series across a 20 V supply. The current is

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

1041. An ideal ammeter and an ideal voltmeter have respectively

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

1042. A galvanometer is converted into an ammeter by connecting

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

1043. The heat produced in a resistor is given by

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

1044. The resistance of a conductor of length L, area of cross section A and resistivity rho is

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

1045. In the resistor colour code, the fourth band indicates

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

1046. The magnetic field at a perpendicular distance r from a long straight wire carrying current I is

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

1047. The force on a 2 m length of wire carrying 3 A placed perpendicular to a 0.5 T field is

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

1048. A loudspeaker converts electrical energy into sound using

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

1049. A diamagnetic substance in a magnetic field is

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

1050. Flux linkage through a coil of N turns each enclosing flux Phi is

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

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