Jk Bose old paper of physics class 12th private 2018 in August download
Total No of Questions : 21]. [Total No. of Printed Page: : 4
set B PHYSICS
set B PHYSICS
Time : 3 Hours}. Maximum Marks : 70
(Long Answer Type Questions) 5 each
1. Derive an expression for the electric field at a point on the axial line of n electric dipole.
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Give, the principle, construction and working of Van de Graff's generaton
Give, the principle, construction and working of Van de Graff's generaton
2. State Biot Savart's law. Hence derive an expression for the magnetic field at the centre of a current carrying circular coiL.
Or
What diamagnetic, paramagnetic and ferromagnetic substances ? Give their properties.
3. Define impedance. Derive an expression for the impedance and phase angle of LCR~a.c. circuit.
What diamagnetic, paramagnetic and ferromagnetic substances ? Give their properties.
3. Define impedance. Derive an expression for the impedance and phase angle of LCR~a.c. circuit.
Or
give the principle. construction and working of a transformer
give the principle. construction and working of a transformer
Q 4. Define diffraction of light. Describe diffraction of light through a single slit.
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What is lens maker’s formula ? Derive lens maker’s formula for a convex lens.
What is lens maker’s formula ? Derive lens maker’s formula for a convex lens.
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(Short Answer Type Questions) 3 each
5. Two positive charges which are 0.1 m apart repel each Other with a force of 18 N. If the sum of the charges he 9 úC. calculate their individual value.
6. State and explain Kirchhoff laws.
7. How will you compare e.m.f. of two cells by potentiometer
8. State and explain Faraday’s; laws of electromagnetic Induction.
9. What is total internal reflection of light ? What are conditions for total internal reflection?
10. The ratio of amplitude of two waves producing interference pattern is i 1: 4. Find I max to 1min and fringe visibility.
11 Write down the postulates at Bohr’s modal of atom.
12. How is p-n junction diode used as a half~wave rectifier. ?
very Short answer type questions 2 each
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13. What are the elements of earth's magnetic field.? Name them.
14 Give four properties of electtomagnetic waves.
15 state malus law of Polarization in mathematical forms.
16Define photo -electric effect and threshold work function
l7. Calculate momentum of a particle of wavelength 2A. Take h= 6'6
x10-³⁴ J-s.
18. write four properties of ß-rays.
18. write four properties of ß-rays.
19. Give the truth table and logic symbol of AND gate.
20. Why sky waves are not used for transmission of TV signals.
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(Objective Type Questions). 1 each
21. D0 as directed ;
(i) What is the resistance. if bands of colour on carbon resistor in sequence are red, black. gold ?
(ii) The resistance of ideal voltmeter is :
(a) Zero. (b) Intinite
(c) very small. (d) very large
(c) very small. (d) very large
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(iii) Name the layer of the atmosphere from winch radio waves are reflected.
(iv) Find the focal length of combination of a convex lens and concave lens of focal length 20 cm and 30 cm respectively.
(v) What is the ratio of mass number of two nuclei with radius in the ratio of l : 2 ?
(Vi) An n-type semiconductor is electrically neutral. (T rue/False)
(vii) The resistance and width of depletion layer of p-n junction diode decreases during forward bias. (True/False)
(viii) Define demodulation.
(ix) What are the three elements of basic communication system
(x)Modulation is an essential feature of :
(a) transmitter (b) receiver
(c) both of them (d) None of these
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