List of top Physics Questions

Biological importance of ozone layer is

A dipole of dipole moment $ \overrightarrow{ p} $ is placed in uniform electric field $ \overrightarrow{ E}$ then torque acting on it is given by

A scientist says that the efficiency of his heat engine which work at source temperature $127^{\circ } C $ and sink temperature $27^{\circ} C $ is $26\% ,$ then

The equation of a wae is represented by $y=10^{-4} \sin \Bigg(100t -\frac{x}{10}\Bigg)m, $ then the velocity of wave will be

A cricketer catches a ball of mass 150 gm in 0.1 sec moving with speed 20 m/s, then he experiences force of

A 1 kg stationary bomb is exploded in three parts having mass $1 : 1 : 3$ respectively. Part having same mass move in perpendicular direction with velocity 30 m/s, then the velocity of bigger part will be

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio $C_p / C_v$ for the gas is

A balloon rises from ground with an acceleration of $1.25\, m s^{-2}$. After $8s$ a stone is released from balloon. The stone will

A $20 \,cm$ length of a certain solution causes right-handed rotation of $38^\circ$. A $30\, cm$ length of another solution causes left-handed rotation of $24^\circ$. The optical rotation caused by $30\, cm$ length of a mixture of the above solutions in the volume ratio $1 : 2$ is

While a capacitor remains connected to a battery, a dielectric slab is slipped between the plates.

A milliammeter of range 10 mA has a coil of resistance $1\Omega$. To use it as a voltmeter of range 10 V, the resistance that must be connected in series with it is

If white light is used in Young's double-slit experiment,

The resultant of two forces $3\,P$ and $2\,P$ is $R$. If the first force is doubled, then the resultant is also doubled. The angle between the two forces is

In the circuit shown in figure, neglecting source resistance, the voltmeter and ammeter readings will respectively be

In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum

In the relation, $p = \frac{\alpha}{\beta} e^{-\frac{\alpha Z}{k\theta}}$ $p$ is pressure, $Z$ is distance, $k$ is Boltzmann constant and $\theta$ is the temperature. The dimensional formula of $\beta$ will be

Two springs A and B having spring constant K$_A$ and K$_B$ (K$_A$ = 2K$_B$) are stretched by applying force of equal magnitude. If energy stored in spring A is E$_A$ then energy stored in B will be

ABCD is a square loop made of an uniform conducting wire. The current enters the loop at A and leaves at D. The magnetic field is

A projectile is moving at $20\,m\,s^{-1}$ at its highest point, where it breaks into two equal parts due to an internal explosion. One part moves vertically up at $30\,m\,s^{-1}$ with respect to the ground. Then the other part will move at

A ray of light passes through four transparent media with refractive indices $\mu_1,\mu_2,\mu_3$ and $\mu_4$ as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

In a Young's double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

Ratio of kinetic energy and rotational energy in the motion of a disc is:

Optical fibre are based on

If |A →+ B→| = |A→|= |B→| then angle between A and B will be

A ray of light travelling in air haves wavelength λ, frequency n, velocity v and intensity I. If this ray enters into water then these parameter are λ', n' , v' and I' respectively. Which relation is correct