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Q1) Why is the transmission of signals using sky waves, restricted to frequencies greater than 30 MHz. (Marks 1)
Ans1) The transmission of signals using sky waves is restricted to frequencies greater then 30 MHz since lower frequencies are highly damped by interaction with matter.
Q8) How does magnetic induction of a paramagnetic substance vary with temperature. (Marks 1)
Ans8) The magnetic induction of a paramagnetic substance decreases with the increase in temperature.
Q9) Draw a labelled ray diagram to show the image formation in an astronomical telescope for a distant object. (Marks 2)
Ans9) Ray diagram of image formation by Astronomical telescope.
A"B” : Final image
O : Objective
E : Eye piece
d : least distance of distinct image
Q11) The half-life of a radioactive sample in 30 seconds calculate (i) the decay constant & (ii) time taken for the sample to become 1/4th of its initial value (Marks 2)
Ans11) (i) T1/2 = 30 s
= 0.693/T1/2 = 0.693/30 = 0.0231 s-1
(ii) In 30 s, substance is reduced to half & in next 30s, it will be reduced to 1/4th
Hence time taken for substance to reduce to 1/4th of its initial value = 60 s
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[Only those questions and answers which are different from Set I have been given here.]
Q 2. If a rate of change of current of 3 A/s induces an e.m.f. of 30 mV in .....
.....
(Only those questions have been answered, which are different from Set I and Set II)
Q6) What is the difference between voltage across an inductor & a capacitor in an a.c. circuit. (Marks 1)
Ans6) Voltage leads the current by /2 in an a.c circuit containing inductor & voltage lags .....
(Only those questions have been given, which are different from Set I)
Q2) Draw the energy band diagram for a p-type extrinsic semi-conductor. (Marks 1)
Ans2) Energy band diagram of p-type semi conductor
Q8) Two wires A and B of the same length and of the same metal have their .....
[Only those questions and answers which are different from set 1 have been given here.]
Q.1.If a rate of change of current of 4 A/s induces an e.m.f. of 20 mV in a solenoid, what is the self-inductance of the solenoid ? (1 mark)
Ans 1.
................. dI .....
(Only those questions have been answered, which are different from Set I and Set II)
Q6) Name the electromagnetic radiation which has the largest penetrating power. (Marks 1)
Ans6) Gamma rays have the largest penetrating power.
Q7) Two planets A and B have solar constants 50 W/m2 and 1400 W/m2 .....
Q1) Horizontal component and vertical component of Earth's magnetic field at a place are equal. what is the value of angle of dip at this place? (Marks 1)
Ans1) BV = BH
tan = BV/BH = 1
or = 45o
Q5) Is the ratio of number of holes and the number of .....
(Only those uestionshave been given here, which are different from set I )
Q6) Calculate rms value of alternating current in diagram.(Marks 1)
Ans6) Irms = I2 = (1.52 + (-1.5)2 + 1.52) = 1.5A
Q7) Two wires A and B are of the same metal and of the same .....
Q1) Is the ratio of number of holes and the number of conduction electrons in a n-type extrinsic semiconductors more than, less than or equal to 1? (Marks 1)
Ans1) nh/ne in N type < 1 as holes are minority charge carriers & electrons are majority charge carriers.
Q9) Use .....
PART 'A' (Accounting III)
Q2) What are the alternatives available to a company for the allotment of debentures when there is over-subscription of debentures? (Marks 3)
Ans2) In case of over-subscription of shares :
(i) The company may reject same applications, i.e the application money received is returned back.
(ii) It may not .....
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