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1) Which of the following is the commercial unit of electric power? a. Joule b. KWh c. Watt d. Ampere
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2) Which of the following represents Electric Power (V=Voltage, I=Current)? a. V x I b. V/I c. 2( V x I) d. 1/VI
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3) What do we call the electrode that can be oxidized or reduced in half reaction? a. Inert electrode b. Active electrode c. Sleeping electrode d. Passive electrode
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4) Which is the direction of magnetic field inside a magnet? a. from south pole to north pole b. from north pole to south pole c. from north pole till centre of the magnet d. None of the above
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5) What is the net magnetic field in a solenoid? a. product of the fields due to all the turns b. equal to the field due to the largest turn c. vector sum of the fields due to all the turns d. arithmetic mean of the fields due to all the turns
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6) Which of these is used to accelerate charged particles or ions to high energies? a. Solenoid b. Cyclotron c. Electric motor d. Toroid
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7) What is the magnetic field at any point in the open space inside the toroid? a. zero b. one c. Depends on the current in the turns d. Depends on number of turns
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8) What is the S.I. unit of magnetic dipole moment? a. joule/tesla b. joule/metre c. tesla/metre d. Newton/metre
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9) Which of the following is a suitable material for making a permanent magnet? a. alnico b. cobalt steel c. ticonal d. All of the above
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10) Which of the following properties of a material make it suitable to become a permanent magnet? a. The material should have high retentivity b. The material should have low coercivity c. The material should have low permeability d. Both b and c
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11) What is the direction of current through external circuit in a galvanic cell? a. flows from cathode to anode b. flows from anode to cathode c. flows in both direction d. None of the above
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12) What happens to a bar magnet of dipole moment (m) is placed in a uniform magnetic field (B)? a. the force on the bar magnet is zero b. the torque on the bar magnet is m × B c. Both a and b d. None of the above
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13) What is the Meissner effect? a. perfect paramagnetism in superconductors b. perfect ferromagnetism in superconductors c. perfect diamagnetism in insulators d. perfect diamagnetism in superconductors
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14) What of following is equivalent to 1 a.m.u? a. 1.660539 x 10-18 kg b. 1.660539 x 10-21 kg c. 1.660539 x 10-24 kg d. 1.660539 x 10-27 kg
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15) Which of the following is a limitation of Bohr’s model of atom? a. it does not explain why orbits of electrons are taken as circular b. it does not take into account the wave nature of electrons c. Both a and b d. None
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16) What is the process which causes the elimination of one or more electrons from the atomic shell known as? a. Excitation b. Ionisation c. Diffusion d. Refraction
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17) What is the fuel in the Sun? a. Helium b. Hydrogen c. Oxygen d. Carbon dioxide
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18) What is the energy equivalence of one atomic mass unit? a. 93.125 eV b. 931.25 eV c. 9.31 eV d. 0.93125 eV
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19) What is the ratio of the change in collector current to the change in base current at a constant collector-emitter voltage, when the common emitter transistor is in active state, known as? a. Input resistance b. Output resistance c. Current amplification factor d. None of the above
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