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Class 12 > PYQ PHYSICS > 2019 > Set 2

2019

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Q1
When unpolarised light is incident on the interface separating the rarer medium and the denser medium. Brewster angle is found to be 60°. Determine the refractive index of the denser medium

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Q2
When a potential difference is applied across the ends of a conductor, how is the drift velocity of the electrons related to the relaxation time?

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Q3
Draw the equipotential surfaces due to an isolated point charge.

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Q4
Explain with the help of Einstein’s photoelectric equation any two observed features in photo-electric effect which cannot be explained by wave theory.

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Q5
A deuteron and an alpha particle having same momentum are in turn allowed to pass through a magnetic field B, acting normal to the direction of motion of the particles. Calculate the ratio of the radii of the circular paths described by them.

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Q6
(a) Plot a graph showing variation of de Broglie wavelength (X) associated with a charged particle of mass m, versus √v, where V is the accelerating potential.
(b) An electron, a proton and an alpha particle have the kinetic energy. Which one has the shortest wavelength ?

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Q7
(a) State the underlying principle of a moving coil galvanometer.
(b) Give two reasons to explain why a galvanometer cannot as such be used to measure the value of the current in a given circuit
(c) Define the terms:
(i) voltage sensitivity and
(ii) current sensitivity of a galvanometer.

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Q8
(a) Draw equipotential surfaces corresponding to the electric field that uniformly increases in magnitude along with the z-directions.
(b) Two charges -q and + q are located at point (0, 0, – a) and (0, 0, a). What is the electrostatic potential at the points (0, 0, ± z) and (x, y, 0) ?

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Q9
(a) Write the relation between half-life and average life of a radioactive nucleus.
(b) In a given sample two isotopes A and B are initially present in the ratio of 1: 2. Their half-lives are 60 years and 30 years respectively. How long will it take so that the sample has these isotopes in the ratio of 2 :1?

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Q10
(a) Define the term ‘self-inductance’ of a coil. Write its S.I. unit.
(b) A rectangular loop of sides a and b carrying current I₂ is kept at a distance ‘a’ from an infinitely long straight wire carrying current I1 as shown in the figure. Obtain an expression for the resultant force acting on the loop.
figure:

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