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1.In the young’s double slit experiment, the interference pattern is found to have an intensity ratio between bright and dark fringes as 9. This implies that (a) the intensities at the screen due to two slits are 5 unit and 4 units respectively (b) the intensities at the screen due to two slits are 4 units and 1 unit respectively

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Guess Paper- 2013Subject: PhysicsClass 12th SET ATime allowed: 3 hours Maximum Marks: 70General Instructions:(i) All questions are compulsory..(iii) Q.No. 1 to 8 are very short answer type questions, carrying one mark each.(iv) Q.No numbers 9 to 16 are short answer type questions, carrying two marks each.(v) Q.No. 17 to 25 are also short answer type questions, carrying three marks each.(vi)Q.No. 26 is a value based question, carrying four marks(vi) Q.No. 27 to 29 are long answer type questions, carrying five marks each.(viii) You may use the following values of physical constants wherever necessaryc=3x108 m/s h=6.6 x 10-34 Js e=1.6 x 10-19 C NA = 6.023 x 1023 /mole mn = 1.67 x 10-27 kg 0 =4 x 10-7 T-m/A me = 9 x 10-31 kgQ1. A point charge Q is placed at point O as shown in figure.Is potential difference VA- VB positive ,negative or zero ,if Q is (i) positive (ii) negative?Q2. If a wire is stretched to double its original length without loss of mass, how will resistivity of the wire be influenced?Q3. The permeability of magnetic material is 0.9983 .Name the type of magnetic material it represents.Q4. Define the term wattles current.Q5. How are radio waves produced?Q6. In a single slit diffraction experiment, the width of the slit is made double the original width. How does this af

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