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School/+2

Physics Class- XII 2000(CBSE)
You are on Set no 2 Qno. 1 to 30

Time allowed : 3 hours
Maximum Marks : 70

General Instructions :

(i) All questions are compulsory.
(ii) Marks for each question are indicated against it.
(iii) Question number 1 to 8 are very short-answer questions each of 1 mark. Answer them in about one sentence each.
(iv) Question number 9 to 18 are short-answer questions of 2 marks. Answer them in not more than 30 words each.
(v) Question number 19 to 27 are short-answer questions of 3 marks. Answer them in not more than 50 words each.
(vi) Question number 28 to 30 are long-answer questions of 5 marks each. Answer to these questions should be around 150 words each.
(vii) Use Log Tables, if necessary.
(viii) Please write down the serial number of the question before attempting it.


Q1) Draw an equipotential surface for a point charge Q > 0.  (Marks 1)

Q2) If the ratio of the horizontal component of earth's magnetic field to the resultant magnetic field at a place is 1/2, what is the angle of dip at that place ?  (Marks 1)

Q3) How does the energy gap in an intrinsic semiconductor vary, when doped with a pentavalent impurity ?  (Marks 1)

Q5) Why is the transmission of signals using ground waves, restricted only to a frequency of 1500 kHz ?  (Marks 1)

Q9) Four capacitors are connected as shown in the figure given below :

Calculate the equivalent capacitance between the points X and Y.  (Marks 2)

Q10) Draw the logic symbol of a 2 - input NOR gate. Write down its truth table.  (Marks 2)

Q13) If the wavelength of incident light on a (i) concave mirror, and (ii) convex lens is increased, how will the focal length of each of these change ? 
(Marks 2)

Q19) With the help of a labelled circuit diagram, explain how will you compare the e.m.fs of two primary cells using a potentiometer. State the formula used.  (Marks 3)

Q21) State how in a photocell the work function of the metal depends on the kinetic energy of emitted electrons. If the frequency of the incident radiation is doubled what changes occur in the (i) stopping potential, and (ii) photoelectric current.  (Marks 3)

Q26) A short bar magnet of magnetic moment 0.9 joule/ tesla is placed with its axis at 30o to a uniform magnetic field. It experiences a torque of 0.063 joule (i). Find the strength of the magnetic field, and (ii) what orientation of the bar magnet corresponds to the stable equilibrium position in the magnetic field ?  (Marks 3)

Q28) For a given a.c circuit distinguish between resistance, reactance and impedance. An a.c source of 50 hertz frequency is connected to an 100 mH inductor and a bulb. The bulb glows with some brightness. Calculate the capacitance of the capacitor to be connected in series with the circuit for which the bulb will glow with maximum brightness.  (Marks 3+2)



 
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