List of top Physics Questions

A dip needle arranged to move freely in the magnetic meridian dips by an angle $\theta$. If the vertical plane in which the needle moves is rotated through an angle $\alpha$ to the magnetic meridian, then the needle will dip by an angle
If the total magnetic field due to earth is $28 \,Am$, then the total magnetic induction due to earth is
The effect due to uniform magnetic fie Id on a freely suspended magnetic needle is as follows
A ball is thrown from a point with a speed $ {{\text{v}}_{\text{0}}} $ at an angle of projection $ \theta . $ From the same point and at the same instant, a person starts running with a constant speed $ \frac{{{v}_{0}}}{2} $ to catch the ball. Will the person be able to catch the ball? If yes, what should be the angle of projection?
In $R-C$ circuit $\omega=100\, rad \,s ^{-1},\, R =100\, \Omega,\, C =20\, \mu\, F$. What is impedance?
The magnetic moment of atomic neon is
Two balls of same mass each m are moving with same velocities v on a smooth surface as shown in figure. If all collisions between the masses and with the wall are perfectly elastic, the possible number of collisions between the bodies and wall together is
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine ? (g = 10 m/s$^2$)
A thin wire of mass $ M $ and length $ L $ is bent to form a circular ring. The moment of inertia of this ring about its axis is
Two closed organ pipes of length $100 \,cm$ and $101\, cm$ produces $16$ beats in $20\, sec .$ When each pipe is sounded in its fundamental mode calculate the velocity of sound.
The wavelength of red light from $He-Ne$ laser is $ 633\, nm $ in air but $ 474 $ nm in the aqueous humor inside the eye ball. Then the speed of red light through the aqueous humor is
The velocity of electromagnetic radiation in a medium of permittivity ? and permeability � is given by
The unit of universal gas constant is
The forbidden gap in the energy bands of silicon is
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
The image formed by a concave mirror
If two molecules of $A$ and $B$ having mass $100 \,kg$ and $64\, kg$ and rate of diffusion of $A$ is $ 12\times 10^{-3}, $ then what will be the rate of diffusion of $B$?
In radioactive decay process, the negatively charged emitted (3-particles are
The mass of the earth is $6 \times 10^{24}\, kg$ and that of the moon is $7.4 \times 10^{22}\, kg$. The potential energy of the system is $-7.79 \times 10^{28}\, J$. The mean distance between the earth and moon is $(G = 6.67 \times 10^{-11}\, N\, m^2kg^{-2})$
Spherical balls of radius R are falling in a viscous fluid of viscosity $ \eta $ with a velocity v. The retarding viscous force acting on the spherical ball is
A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement $ x $ is proportional to
What is X in the following nuclear reaction? ${ }_{7} N ^{14}+{ }_{1} H ^{1} \longrightarrow{ }_{8} O ^{15}+X$
If the lattice constant of this semiconductor is decreased, then which of the following is correct ? Conduction band width Band gap Valence band width
Consider a two particle system with particles having masses m, and m2. If the first particle is pushed towards the centre of mass through a distance d, by what distance should the second particle be moved, so as to keep the centre of mass at the same position ?
A thin circular ring of mass m and radius R is rotating about its axis with a constant angular velocity $\omega.$Two objects each of mass M are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity $\omega.$' = :