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B.Sc.-B.Ed. (Secondary) Examination, 2024
(First Semester)
PHYSICS
DCM-I
Mechanics
Note : There is internal choice is each question. All questions are compulsory.
Electric potential V(x, y, z) = 3xĀ² + yz + xzĀ², find the intensity of electric field.
Or
Rate of radioactive disintegration is directly proportional to the number of undecayed nuclei, from differential equation and solve it.
Derive an expression for center of mass of a hollow one, _
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(2-M24-31/16) N-RJ-121
P.T.O.
Or
What is Central Force ? What is conservative force ? Derive an expression for work done in stretching a spring of spring constant 'K'.
Derive an expression for moment of inertia of a thin uniform rod along an axis passing through its center and perpendicular to it.
12
Or
Is Graphically depict variation of gravity as the distance increases from center of earth. olf height above the surface of the earth is 25%-of the radius of the earth, what is the percentage charge in gravity compared to gravity on surface of the earth.
What is Resonance ? Derive an expression for the amplitude of a forced oscillator with respect to driving frequency.
12
Or
Prove that horizontal (Y-axis) protection of uniform circular motion is sinusoidal. Find its velocity along the Y-axis.
N-RJ-121
2
Write postulates of special theory of relativity. If P is the momentum of a photon, what will be its energy.
Or
Explain Michaelson's-Morley experiment and explain the result.