CBSE Class 12   CBSE Class 12 Physics

About the CBSE Class 12 Physics category (1)
(a) The ratio of the widths of two slits in Young's double slit experiment is 4 : 1. Evaluate the ratio of intensities at maxima and minima in the interference pattern (4)
Draw V-I characteristics of a p-n junction diode (3)
Use Lenz’s law to determine the direction of induced current in the situations described by figure (3)
Use Kirchhoff s rules to determine the value of the current $I_{1 }$ flowing in the circuit shown in the figure (3)
A solenoid of length 50 cm having 100 turns carries a current of 2.5 A (3)
Assignment for physics (1)
A nucleus with mass numbers (3)
In the figure below, the electric field lines (3)
Magnetic flux through cross section (1)
How does a charge q oscillating at certain frequency produce electromagnetic waves (3)
Electromagnetic waves (1)
The carrier wave is given by C(t)=2sin(8πt) volt. The modulating signal is a square wave . Calculate the modulation index (2)
Given a uniformly charged plane/sheet of surface charge density (3)
Physics 2nd part of Q 7 related to wave optics (1)
Consider a two slit interference arrangement (shown in figure) such that the distance of the screen from the slits is half the distance between the slits (3)
You are given two converging lenses of focal length 1.25 cm (3)
A concave mirror of small aperture forms a sharper image. Why? (1)
Suppose while sitting in a parked car (2)
When monochromatic light travels from a rarer to a denser medium, explain the following, giving reasons (2)
You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain (2)
The image obtained with a convex lens is erect (2)
A convex lens of focal length 30 cm is placed coaxially with a convex mirror of radius of curvature 20 cm (2)
Figure shows an equiconvex lens (2)
A screen is placed 90 cm from an object (2)
The near vision of an average person is 25 cm (2)
You are given prisms made of crown glass and flint glass with a wide variety of angles (2)
A man with normal near point (25 cm) reads a book with small print using a magnifying glass (2)
A small telescope has an objective lens of focal length 140 cm (2)
An astronomical telescope uses two lenses of power 10 D and ID. What is its magnifying power in normal adjustment? (1)