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Q 1. What is the work done in moving a charge of 10 nC between two points on an equipotential surface ? (1 mark)
Ans 1. dw = qdv
on equipotential surface dv = 0
dw = 0 i.e,no work is done in moving a change on an equipotential surface.
Q 2. Name the device used for measuring the internal resistance of a secondary cell ? (1 mark)
Ans 2. Internal resistance of a secondary cell can be measured by a potentiometer.
Q 3. What is the nature of magnetic field in a moving coil galvanometer ? (1 mark)
Ans 3. A radial magnetic fields exists in a moving coil galvanometer.
Q 4.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)
Ans 4. Given dI = 2 A/S , 10mv = 10-3V
dt
| | = L dI
dt
or 10 x 10
-3 = L x 2
or L = 10-2 = 5 x 10-3 H = 5mH
2
Q 5. What type of magnetic material is used in making permanent magnets ? (1 mark)
Ans 5. A substance like steel which as a large retentivity and a large coercivity is used in making permanent magnets.
Q 6. Two metals A, B have work-functions 2eV, 4eV respectively. Which metal has lower threshold wavelength for photoelectric effect ? (1 mark)
Ans 6. Work function W = h v
0 = hc where is threshold wavelength.
x 1
W
Metal B has higher value of W & hence lower threshold wavelength.
Pages: 1 2 3 4 5 6 7 8
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Related pages
[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 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 .....
Q2) Give any three characteristics of partnership. (Marks 3)
Ans2) Three characteristics of partnership :
1) There must be an agreement entered into by one or more persons.
2) There must be lawful business.
3) Business must be carried on by all or any of them acting for all.
Q4) A, B and C were .....
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 .....
(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 .....
Q1) Give any three points of distinction between revaluation account and realisation account. (Marks 3)
Ans1) Revaluation and Realisation account :
(i) Revaluation is prepared at the time of admission, retirement and death of a partner. Realisation is prepared at the time of dissolution of the firm.
(ii) Revaluation is prepared record the .....
Q2) Find the work done by the force = + 2 + , acting on a particle, if the particle is displaced from the point with position vector 2 + + to the point with position vector 3 + 2 + 4.
Ans2) Here = + 2 .....
(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 .....
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