Board Paper of Class 12-Science 2014 Physics (SET 1) - Solutions
General Instructions:
(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) Questions Nos. 9 to 18 carry two marks each. Questions Nos. 19 to 27 carry three marks each and questions Nos. 28 to 30 carry five marks each.
(iv) 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 choices in such questions.
(v) Use of calculators is not permitted. However, you may use log tables if necessary.
(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) Questions Nos. 9 to 18 carry two marks each. Questions Nos. 19 to 27 carry three marks each and questions Nos. 28 to 30 carry five marks each.
(iv) 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 choices in such questions.
(v) Use of calculators is not permitted. However, you may use log tables if necessary.
- Question 1
Using the concept of force between two infinitely long parallel current carrying conductors, define one ampere of current. VIEW SOLUTION
- Question 2
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong? VIEW SOLUTION
- Question 3
Two equal balls with equal positive charge 'q' coulombs are suspended by two insulating strings of equal length. What would be the effect on the force when a plastic sheet is inserted between the two? VIEW SOLUTION
- Question 4
Define intensity of radiation on the basis of photon picture of light. Write its S.I. unit. VIEW SOLUTION
- Question 5
The electric current flowing in a wire in the direction from B to A is decreasing. Find out the direction of the induced current in the metallic loop kept above the wire as shown.
VIEW SOLUTION
- Question 6
Why is it found experimentally difficult to detect neutrinos in nuclear β-decay? VIEW SOLUTION
- Question 7
Why is the use of A.C. voltage preferred over D.C. voltage ? Give two reasons. VIEW SOLUTION
- Question 8
A biconvex lens made of a transparent material of refractive index 1.25 is immersed in water of refractive index 1.33. Will the lens behave as a converging or a diverging lens? Give reason. VIEW SOLUTION
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