General Instructions :

(i)   All questions are compulsary.
(ii)  Marks for each questions are indicated against it.
(iii) Question number 1 to 10 are very short answer question,carrying 1 mark each.They are to be answered in one or two sentences.
(iv) Question number 11 to 22 are short answer questions,each carrying 2 marks.Answer to them should not exceed 30 words each.
(v)  Question numbers 3 to 29 are also short answer questions,each carrying 3 marks.Answer to them should not exceed 40 words each.
(vi) Question numbers 30 to 32 are long answer questions,each carrying 5 marks.Answer to them should not normally exceed 70 words each.
(vii) Use log tables if necessary.

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Q1. What is the work done in moving a charge of 10 nC between two points on an equipotential surface ? (1 mark)


Q2.  Name the device used for measuring the internal resistance of a secondary cell ? (1 mark)


Q3.  What is the nature of magnetic field in a moving coil galvanometer ?
(1 mark)


Q4.  If a rate of change of current of 2 A/s induces an e.m.f.of 10mV in a solenoid, what is the self -inductance of the solenoid ? (1 mark)


Q5.  What type of magnetic material is used in making permanent magnets ? (1 mark)


Q6.  Two metals A, B have work-functions 2eV, 4eV respectively. Which metal has lower threshold wavelength for photo electric effect ? (1 mark)


Q7.  Which have greater ionising power : alpha particles or beta particles ?
(1 mark)


Q8.  Which part of the electromagnetic spectrum is used in operating a RADAR ? (1 mark)


Q9.  Which type of biasing gives a semiconductor diode very high resistance ? (1 mark)


Q10.How is the luminosity of a star related to its radius ? (1 mark)


Q11 An electric dipole, when held at 30⁰ with respect to a uniform electric field of 10⁴N/C, experiences a torque of 9 x 10^-26Nm. Calculate the dipole moment of the dipole. (2 marks)


Q12.A set of n identical resistors, each of resistance R ohm, when connected in series have an effective resistance X ohm and when the resistors are connected in parallel, their effective resistance is Y ohm. Find the relation between R, X and Y. (2 marks)


Q13.State Kirchhoff's rules for eletrical networks. (2 marks)


Q14.Show that Lenz's law is in accordance with the law of conservation of energy. (2 marks)


Q15.Draw a labelled diagram of Hertz's experiment for producing electromagnetic waves. (2 marks)


Q16.Give two differences between fringes formed in single slit diffraction and Young's double slit experiment. (2 marks)