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Showing 926 to 950 of 1648 questions (page 38 of 66).

926. The angular magnification of an astronomical telescope in normal adjustment is

A. fo/fe B. fo x fe C. fe/fo D. 1 + fo/fe E. fo - fe

927. The defect of vision in which a person cannot see distant objects clearly is corrected using

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

928. An endoscope used in medicine works on the principle of

A. diffraction B. dispersion C. polarization D. interference E. total internal reflection through optical fibres

929. The value of the Boltzmann constant is about

A. 1.38 x 10^-23 J K-1 B. 8.314 J K-1 C. 1.6 x 10^-19 J D. 6.63 x 10^-34 J s E. 9.1 x 10^-31 J K-1

930. The work done by a gas expanding at constant pressure is

A. V times the change in pressure B. P times the change in volume C. (1/2)P V D. nRT ln(V2/V1) E. zero

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

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

932. The triple point of water is

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

933. 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. the first law forbids it D. the working substance has mass E. friction is unavoidable in practice only

934. 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

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

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

936. 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

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

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

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

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

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

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

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

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

941. One ampere is equivalent to

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

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

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

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

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

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

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

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

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

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

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

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

948. Two parallel wires carrying current in the same direction

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

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

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

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

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

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