Board Paper of Class 12-Science 2015 Physics (SET 2) - Solutions
General Instructions:
(i) There are 26 questions in all. All questions are compulsory.
(ii) This question paper has five sections : Section A, Section B, Section C, Section D and Section E.
(iii) Section A contains five questions of one mark each, Section B contains five questions of two marks each, Section C contains twelve questions of three marks each, Section D contains one value based question of four marks and Section E contains three questions of 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 the three questions of five marks weightage. You have to attempt only one of the choices in such questions.
- Question 1
Why does the Sun look reddish at sunset or sunrise ? VIEW SOLUTION
- Question 2
The power factor of an a.c. circuit is 0.5. What is the phase difference between voltage and current in this circuit ? VIEW SOLUTION
- Question 3
Is it necessary for a transmitting antenna to be at the same height as that of receiving antenna for LOS communication ? VIEW SOLUTION
- Question 4
Plot a graph showing the variation of resistivity of a conductor with temperature. VIEW SOLUTION
- Question 5
Write the expression for the torque acting on a dipole of dipole moment placed in an electric field . VIEW SOLUTION