Board Paper of Class 12-Science 2012 Physics (SET 1) - Solutions
(i) All questions are compulsory.
(ii) There are 30 questions in total. Question Nos. 1 to 8 are very short answer type questions and carry one mark each.
(iii) Question Nos. 9 to 18 carry two marks each, question 19 to 27 carry three marks each and question 28 to 30 carry five marks each.
(iii) There is no overall choice. However, an internal choice has been provided in one question of two marks; one question of three marks and all three questions of five marks each. You have to attempt only one of the choice in such questions.
(iv) Use of calculators is not permitted.
- Question 1
Two wires of equal length, one of copper and the other of manganin have the same resistance. Which wire is thicker?
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- Question 2
What are the directions of electric and magnetic field vectors relative to each other and relative to the direction of propagation of electromagnetic waves?
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- Question 3
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit screens is doubled?
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- Question 4
A bar magnet is moved in the direction indicated by the arrow between two coils PQ and CD. Predict the directions of induced current in each coil.
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- Question 5
For the same value of angle of incidence, the angles of refraction in three media A, B and C are 15°, 25° and 35° respectively. In which medium would the velocity of light be minimum?
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- Question 6
A proton and an electron have same kinetic. Which one has greater de-Broglie wavelength and why?
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- Question 7
Mention the two characteristic properties of the material suitable for making core of a transformer.
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- Question 8
A charge ‘q’ is placed at the centre of a cube of side l. What is the electric flux passing through each face of the cube?
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