List of top Physics Questions

A bullet is fired with a speed of $1000 \,m/s$ in order to hit a target $100 \,m$ away. If $g = 10 \,m/s^2$ . The gun should be aimed
The horizontal range of a projectile is $400\, m$. The maximum height attained by it will be:
In Young's double slit experiment, fringe width decreases by 25% when apparatus is immersed in a liquid. Refractive index of the liquid is
When interference is observed, energy is
In an interference experiment, distance between the slits is 2 mm and screen is placed at distance 1 m from the slits. Fourth dark fringe is formed exactly opposite to one of the slits. Wavelength of light used in nm is
If work function of a metal is $4.2\,eV$, the cut off wavelength is:
The pressure exerted by an electromagnetic wave of intensity $I\left( W / m ^{2}\right)$ on a non-reflecting surface is: $[c$ is the velocity of light $]$
Two light rays having the same wavelength $\lambda$ in vacuum are in phase initially. Then the first ray travels a path $L_1$ through a medium of refractive index $n_1$ while the second ray travels a path of length $L_2$ through a medium of refractive index $n_2$. The two waves are then combined to produce interference. The phase difference between the two waves is
Turning effect is produced by
A block of mass 2 kg rests on a plane inclined at an angle of $ {{30}^{o}} $ with the horizontal. The coefficient of friction between the block and surface is 0.7. The frictional force acting on the block is:
Water of volume 2 L in a container is heated with a coil of 1 kW at 27$^{\circ}$C. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27$^{\circ}$C to 77$^{\circ}$C? [Specific heat of water is 4.2 kJ/kg]
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: