Download ICSE/ISC Physics Sample Paper Class XII (12th) 2008

Sample Paper – 2008

Class – XII

Subject – Physics

(Set-1)

(Three Hours)

Candidates are allowed additional 15 minutes for only reading the paper.They must not start writing during this time.

Answer all questions in Part 1 and six questions in Part 2 choosing two questions each from Section A,Section B and Section C

All working including rough work should be done on the same sheet as and adjacent to the rest of the answer.The intended marks for each question or parts of question are given in brackets [ ]

Material to be supplied: Mathematical tables including trigonometric tables

A list of useful physical constants is given at the end of the paper.

Part I

(Compulsory)

Answer all the questions briefly and to the point

Question 1 [20]

a) What is the work done by the electric field of the nucleus of an atom on a ‘complete’ circular orbit in which an electron is revolving.What will be the work done if the orbit was elliptical

b) Define mutual inductance

c) A transformer converts a voltage of 12V to 240 V.Calculate the turns ratio

d) State Ampere’s Circuital Law

e) Can a sphere of radius 1cm hold a charge of 1C.Explain

f) When we touch the wires connected to capacitors of capacitance 2µF and 0.2µF both at same potential we get a more intense shock from the wire connected to the 0.2µF capacitor.Why?

g) A potential difference of 10V is applied across a 6m long wire.Calculate potential gradient

h) An inductor of inductance 10mH is connected to an a.c. of frequency 50 Hz.Calculate inductive reactance

i) What is Seebeck effect?

j) What will happen to the drift velocity of electrons in a conductor if:

i) its length is increased

ii) its temperature is increased

k) A cell of internal resistance 0.5 ? is being charged by a p.d. of 15V and by passing a current of 1A.Calculate the emf of the cell

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