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Showing 1026 to 1050 of 3046 questions (page 42 of 122).

1026. In an isochoric process, the work done by the gas is

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

1027. The triple point of water is

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

1028. A heat engine cannot have an efficiency of 100 per cent because

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

1029. The force between two charges placed in a medium of relative permittivity 4 compared with that in vacuum becomes

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

1030. The electric potential at distance r from a point charge q is

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

1031. One electron volt is equal to

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

1032. The charge stored on a 2 microfarad capacitor charged to 100 V is

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

1033. Three capacitors of 2 microfarad each are connected in parallel. The equivalent capacitance is

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

1034. The electric field between two large parallel plates carrying equal and opposite charges is

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

1035. The work done in moving a charge along an equipotential surface is

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

1036. One ampere is equivalent to

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

1037. The power dissipated when 2 A flows through a 5 ohm resistor is

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

1038. 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

1039. Below its critical temperature, the electrical resistance of a superconductor is

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

1040. In a series circuit, the quantity that is the same through every component is

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

1041. 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. the corkscrew rule for potential E. Lenz's law

1042. 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. mq/vB E. qB/mv

1043. Two parallel wires carrying current in the same direction

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

1044. Faraday's law of induction states that the induced emf is proportional to the

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

1045. 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. AB omega C. NA omega D. NAB omega E. NAB

1046. The back emf in a DC motor is greatest when the motor is

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

1047. 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. 110 V C. 2.2 V D. 2200 V E. 220 V

1048. The negative sign in Faraday's law expresses

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

1049. Mutual inductance between two coils depends on

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

1050. 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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