Subject: PHYSICS
Class : XII
(Set-4)
M M: 70 Time :3 h
General Instructions :
All questions are compulsory.
This paper includes Electrostatics , Electricity and Magnetism only
Question numbers 1 to 7 are very short answer type questions, carrying one mark each.
Question numbers 8 to 19 are short answer type questions, carrying two marks each.
Question numbers 20 to 27 are also short answer type questions, carrying three marks each.
Question numbers 27 to 30 are long answer type questions, carrying five marks each.
Use of calculators is not permitted. However, you may use log tables, if necessary.
Q.1> Why is conductivity of electrolytes less than that of metals?
Q.2 > Name the physical quantity whose SI unit is Coulomb per Volt.
Q.3> A student obtains resistances of 3, 4, 12, 16ohms using only two metallic resistance wires either separately or joined together. What is the value of resistance of each of these wires.
Q.4> Define Dielectric constant in terms of force b/w the charges.
Q.5> In a certain arrangement a proton does not get deflected while passing through a magnetic field region. Under what conditions is it possible?
Q.6> Lorentz force is given by F = Q ( VxB ). Of these, name the pairs of vectors which are always at right angles to each other.
Q.7> Mention 2 properties of alloys from which permanent magnets are made
Q.8> An alpha particle and a proton are accelerated by the same potential difference. Calculate the ratio of linear momenta acquired by the two.
Q.9> Define “Intensity of Electric field” at a point. At what points is the electric dipole field intensity parallel to the line joining the charges?
Q.10> Capacitor P, Q and R each have a capacitance C. A battery can charge the capacitor P to a potential V. If after charging P, the battery is disconnected from it and the charged capacitor P is connected in following separate instances to Q and R
In parallel to Q and (b) In series to R, then what will be the potential difference across P?
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