List of top Physics Questions

Electromagnetic waves can be deflected by
A bar magnet is held at right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is
A circular coil of radius 40 mm consists of 250 turns of wire in which the current is 20mA. The magnetic field in the center of the coil is $\mu =4\pi?10^{-7}Hm^{-1}$
The velocity $v$ of a particle at time $t$ is given by $v=at+\frac{b}{t+c}$ , where $a$, $b$ and $c$ are constants. The dimensions of $a$, $b$ and $c$ are, respectively,
A current of 5A is passing through a metallic wire of cross-sectional area $4\times10^{-6}m^2$ If the density of the charge carriers in the wire is 5 ? $10^{26}m^{-3}$, the drift speed of the electrons will be [e = 1.602 ? $10^{-19}C$]
Three resistances of values 2$\Omega$, 3$\Omega$ and 6$\Omega$ are to be connected to produce an effective resistance of 4$\Omega$ . This can be done by connecting
A rectangular vessel when full of water, takes $10$ minutes to be emptied through an orifice in its bottom. How much time will it take to be emptied when half filled with water ?
A solenoid $1.5\, m$ long and $0.4\, cm$ in diameter possesses $10$ turns per cm length. A current of $5\, A$ flows through it. The magnetic field at the axis inside the solenoid is
An unpolarised beam of intensity $I_0$ is incident on a pair of nicols making an angle of $60^\circ$ with each other. The intensity of light emerging from the pair is
If $\lambda_{1}$ and $\lambda_{2}$ are the wavelengths of the first members of the Lyman and Paschen series respectively, then $\lambda_{1}: \lambda_{2}$ is
The series combination of two capacitors shown in figure is connected across 1000V. The magnitude of the charges on the capacitors will be
The resistance of a field coil measures 50$\Omega$ at 20?C and 65$\Omega$ at 70?C. The temperature coefficient of resistance is
RMS value of AC is _______ of the peak value
In a tangent galvanometer, a current of 1A produces a deflection of 30?. The current required to produce a deflection of 60? is
In the presence of magnetic field ?B? and electric field ?E?, the total force on a moving charged particle is
In a P-type semiconductor, the acceptor impurity produces an energy level
Two circular coils 1 and 2 are made from the same wire but the radius of the $1^{st} $ coil is twice that of the $ 2^{nd} $coil. What potential difference in volts should be applied across them so that the magnetic field at their centres is the same-
A rectangular block is 5 cm $\times$ 5 cm $\times$ 10 cm in size. The block is floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occure in the level of water?
An ice block contains a glass ball. When the ice melts within the water containing vessel, the level of water:
Air is blown through a hole on a closed pipe containing liquid. Then, the pressure will
A body of mass 3 kg is under a constant force which causes a displacement s in meters in it, given by the relation s = (\(\frac{1}{3}\)) t2, where t is in s. Work done by the force in 2 s is :
If $?=10^{-10}m$ changes to $?'=0.5 \times 10^{-10}m, $ find energy difference $(?E) $ given to the particle
A block of wood resting on an inclined plane of angle $ 30{}^\circ $ , just starts moving down. If the coefficients of friction is 0. 2, its velocity (in ms-1) after 5 s is: $ (g=10m{{s}^{-2}}) $
A body of mass 2 kg is projected from the ground with a velocity $ 20m{{s}^{-1}} $ at an angle $ 30{}^\circ $ with the vertical. If $ {{t}_{1}} $ is the time in seconds at which the body is projected and $ {{t}_{2}} $ is the time in seconds at which it reaches the ground, the change in momentum in kg ms-1 during the time $ ({{t}_{2}}{{t}_{1}}) $ is:
If $r_1$, and $r_2$ are the radii of the atomic nuclei of mass numbers $64$ and $125$ respectively, then the ratio ($r_1/r_2$) is