List of top Physics Questions

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is of the ratio of their focal length is $\frac{3}{2}$ Their equivalent focal length is 30 cm. What are their individual focal lengths ?

Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is

The exposure time of a camera lens at $ f/2.8 $ setting is $1/200$ s. The correct exposure time at $ f/5.6 $ setting is:
The X-ray cannot be diffracted by means of an ordinary grating due to
There are $26$ tuning forks arranged in the decreasing order of their frequencies. Each tuning fork gives $3$ beats with the next. The first one is octave of the last. What is the frequency of $18th$ tuning fork?
The fundamental frequency of a sonometer wire is n. If its radius is doubled and its tension becomes half, the material of the wire remains same, the new fundamental frequency will be:
The functions of moderators in nuclear reactor is to:
If suddenly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then the satellite will:
If in a circular coil A of radius R, current $ i $ is flowing and in another coil B of radius 2R a current $ 2i $ is flowing, then the ratio of the magnetic fields, $ {{B}_{A}} $ and $ {{B}_{B}} $ produced by them will be:
If two mirrors are kept at $ 60{}^\circ $ to each other, then the number of images formed by them is:
The effective acceleration of a body, when thrown upwards with acceleration $a$ will be
The correct option, if speed of gamma rays, $ x- $ rays and micro waves are $ {{\upsilon }_{g}},{{\upsilon }_{x}} $ $ \And \,{{\upsilon }_{m}} $ respectively will be:
''Pascal-second'' has the dimensions of:
A metal surface is exposed to solar radiations:
Why the dam of water reservoir is thick at the bottom?
Refractive index of material is equal to tangent of polarizing angle. It is called:
A car accelerates from rest at constant rate for first $10\, s$ and covers a distance $x$. It covers a distance $y$ in next $10\,s$ at the same acceleration. Which of the following is true?
If radius of the sphere is (5.3 $ \pm $ 0. 1) cm. Then percentage error in its volume will be
Minimum number of unequal vectors which can give zero resultant are:
A uniform rope of length $L$, resting on a frictionless horizontal surface, is pulled at one end by a force $F$. The tension in the rope at a distance $l$ from this end is
A short linear object of length b lies along the axis of a concave mirror of focal length $ f $ at a distance $ u $ from the pole of the mirror, what is the size of image?
A raft of wood of mass $120\, kg$ floats in water. The weight that can be put on the raft to make it just sink, should be $\left(d_{ \text{raft} }=600\, kg / m ^{3}\right)$
Which of the following is most unstable?
Which of the following is not a property of light?
Which of the following logic gates is a universal gate?