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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
The Practice Paper is a product of CBSE Class 12th Board exam experts of jagranjosh.com, an online educational portal of Dainik Jagran.
After a round analysis for the previous four years of CBSE Class 12th Board Physics Question papers, the jagranjosh.com experts have set this Practice Paper for the 2015 CBSE Class 12th Boards.
An analysis of Previous Years Physics Question Papers has been mentioned here:
PREFACEPREFACE
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
Below are the Chapters covered under the entitled units:
This conceptual Practice Paper along with guided solutions is a product exclusively for CBSE Class 12th students. The pattern of the Practice Paper is as per the Previous Year’s CBSE Board Physics Question Papers, thus the students will find it easy and understandable in all its aspects.
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
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Free Checklist for the Year 2015 for Class 12th Physics:• Syllabus• Chapter-wise Tips & Strategy• Chapter-wise NCERT Solution• Chapter-wise Online Test• Sample Paper• Solved Practice Paper• Solved Guess Paper• Guess Paper• Stress Management• Time Management• Further Career Options
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
Q 1. A circular coil of radius r carrying a current I has its magnetic dipole moment directed into the plane of the paper. What is the:
(i) Magnitude of dipole moment?
(ii) Direction of current through the coil?
Q 2. The power factor of an a.c. circuit is 0.5. What will be the phase difference between voltage and current in this circuit? If the circuit has a resistance of 10 Ω , what will be the value of impedance in the circuit?
Q 3. Name the type of communication in which the signal:
(i) Has continuously varying values of voltage with time.
(ii) Is discrete and binary coded version of the message information.
Q 4. A convex lens of large aperture has a point object placed on its principal axis. The image formed by the lens is blurred. Give reason. Suggest a method to get a sharper
Practice Paper - 2015Class: XII
Subject: PhysicsSet - 2
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
image.
Q 5. An electric dipole is placed in a uniform electric field so as to be in unstable equilibri-um. Show the orientation of the dipole with respect to the electric field. What can we say about the energy of the dipole in this orientation?
Q 6. In a particular experimental set-up using meter bridge, the balancing length is found to be 44 cm.
The wire of the bridge is replaced by another identical wire having radius twice that of the original wire. What will be the new balancing length?
Q 7. What are the two main functions performed by a repeater station in a communication system?
Q 8. In the circuit shown below; the value of current increases with increase in frequency of the a.c. source. What is the nature of the device marked X?
Q 9. During an experimental study of interference of light in Young's double slit experi-ment, the following operations are carried out:
(a) The screen is moved away from the plane of the slits.
(b) The monochromatic source is replaced by another monochromatic source of longer wavelength.
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
(c) The separation between the two slits is increased.
(d) The width of each of the slits is increased.
Assuming all other parameters other than the one specified to remain unchanged, state the effect on the interference fringes in each case.
Q 10. Three charges of 12 μC, 16 μC and 6 μC are placed at points (0, 0), (4, 0) and (0, 3) as shown in figure. Calculate the work done to move 6 C charge from B (0, 3) to C (0, 2). (All distances are in metres)
OR
A charged spherical drop of radius R has a potential of 100 V on its surface. The drop is sprayed into 1000 smaller identically charged drops. What will be potential on sur-face of each of these tiny drops?
(Given that the capacitance of a sphere of radius x equals ).
Q 11. Using Kirchhoff's rules, determine:
(i) The voltage drop across the unknown resistance R.
(ii) The current flowing through the arm EF in the circuit as shown.
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
Q 12. In an experiment on the photoelectric effect, a graph was plotted between stopping potential and frequency of incident light. The graph-was found to be a straight line.
(i) State the general equation represented by the straight line in the graph with slope 4.12 x 10-15 Vs.
(ii) Calculate the value of Planck's constant.
Q 13. Two identical parallel plate capacitors C1 and C2 have equal potential C each. The plates are now filled with dielectrics as shown. If the two capacitors still have equal capacitance, calculate K. (Given: K1 = 3 and K2 = 2)
Q 14. The current flowing through an electric lamp connected to an a.c. generator is given by
0 sin t.I I ω=
Obtain an expression for the average current over half a cycle.
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
What will be the average current over a complete cycle?
Q 15. Two particles with charge ratio 1 : 2 and mass ratio 1 : 4 have been accelerated through same potential. Find the ratio of
(i) Their momenta.
(ii) de Broglie wavelengths. The particles are initially at rest.
Q 16. Three photodiodes D1, D2 and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV respectively. Which ones will be able to detect light of wavelength 6000 ?
Q 17. State the principle of potentiometer. In an experiment with potentiometer, rheostat coil has a resistance of 80 Ω with the sliding contact in the middle. The 400 cm long potentiometer wire AB has a resistance of 80 Ω .
Calculate:
(i) The current drawn from the 6 V battery.
(ii) The potential gradient.
(iii) Emf, E of the cell if the balancing length is 120 cm.
(iv) The maximum emf which the potentiometer will measure without disturbing the rheo-stat.
Q 18. State the law of radioactive decay.
Plot a graph showing the number (N) of undecayed nuclei as a function of time (t) for a given radioactive sample having half life T1/2 .
Depict in the plot the number of undecayed nuclei at
(i) t = 3 T1/2
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CBSE Class 12th Physics Solved Practice Paper 2015 Set 2
(ii) t = 5 T1/2
Q 19. Two slabs with refractive indices 43
and 32
with thickness as marked in the diagram produce refraction.
Calculate the effective refractive index of the composite system.
Q 20. A galvanometer with a coil of resistance 12 Ω shows full scale deflection for a current of 2.5 mA. Calculate the value of resistance required to convert it into:
(a) An ammeter of range 0 to 7.5 A
(b) A voltmeter of range 0 to 10 V.
Draw the diagrams to show how you will connect this resistance to the galvanometer in each case.
Q 21. How will the frequency; wavelength of a beam of ultraviolet light get affected when it goes from air into glass?
A ray of light incident on an equilateral glass prism shows the minimum deviation of 30°, calculate the speed of light through the glass prism.
Q 22. State the postulates of Bohr's theory of hydrogen atom. Using these postulates, show that the radii of the stationary orbits of electron in hydrogen atom are in the ratio 1 : 4 : 9 : 16.
CBSE Class 12th Solved PhysicsPractice Paper 2015 (Set-II)
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