List of top Physics Questions

The distance between two consecutive points with phase difference of $60^{\circ}$ in a wave of frequency $500 \,Hz$ is $60\, m$ The velocity with which wave is traveling is ___$km / s$

In the given circuit, the equivalent resistance between the terminal $A$ and $B$ is __$\Omega$

In the given circuit, the equivalent resistance between the terminal A and B is Ω

An object of mass 'm' initially at rest on a smooth horizontal plane starts moving under the action of force $F=2 N$ In the process of its linear motion, the angle $\theta$ (as shown in figure) between the direction of force and horizontal varies as $\theta=k x$, where $k$ is a constant and $x$ is the distance covered by the object from its initial position The expression of kinetic energy of the object will be $E=\frac{n}{k} \sin \theta$ The valte of $n$ is

An object of mass m initially at rest on a smooth horizontal plane starts moving

If $\vec{P}=3 \hat{i}+\sqrt{3} \hat{j}+2 \hat{k}$ and $\vec{Q}=4 \hat{i}+\sqrt{3} \hat{j}+25 \hat{k}$ then, The unit vector in the direction of $\vec{P} \times \vec{Q}$ is $\frac{1}{x}(\sqrt{3} i+\hat{j}-2 \sqrt{3} \hat{k})$ The value of $x$ is

The wavelength of the radiation emitted is $\lambda_0$ when an electron jumps from the second excited state to the first excited state of hydrogen atom If the electron jumps from the third excited state to the second orbit of the hydrogen atom, the wavelength of the radiation emitted will be $\frac{20}{x} \lambda_0$ The value of $x$ is

As shown in figure, a cuboid lies in a region with electric field $E=2 x^2 \hat{i}-4 y \hat{j}+6 \hat{k} N / C$. The magnitude of charge within the cuboid is $n \epsilon_0 C$. The value of $n$ is _____. (if dimension of cuboid is $1 \times 2 \times 3 m ^3$ )

A uniform disc of mass $0.5\, kg$ and radius $r$ is projected with velocity $18 \,m / s$ at $t=0$ s on a rough horizontal surface It starts off with a purely sliding motion at $t=0\, s$ After $2\, s$ it acquires a purely rolling motion (see figure) The total kinetic energy of the disc after $2 \,s$ will be ______ $J$ (given, coefficient of friction is $0.3$ and g=10m/s²⁾

A faulty thermometer reads $5^{\circ} C$ in melting ice and $95^{\circ} C$ in stream.The correct temperature on absolute scale will be_______ $K$ (when the faulty thermometer reads $41^{\circ} C$).

A body of mass $2\, kg$ is initially at rest It starts moving unidirectionally under the influence of a source of constant power P Its displacement in $4 s$ is $\frac{1}{3} \alpha^2 \sqrt{P} m$ The value of $\alpha$ will be_______

A stone tied to $180 \,cm$ long string at its end is making $28$ revolutions in horizontal circle in every minute The magnitude of acceleration of stone is $\frac{1936}{x} m s^{-2}$ The value of $x$ _____ ( Take $\pi=\frac{22}{7}$ )

The velocity of a particle executing SHM varies with displacement $(x)$ as $4 v^2=50-x^2$ The time period of oscillations is $\frac{x}{7} s$ The value of $x$ is _______(Take $\pi =\frac{22}{7}$)

A radioactive nucleus decays by two different process The half life of the first process is 5 minutes and that of the second process is $30 s$. The effective half-life of the nucleus is calculated to be $\frac{\alpha}{11}$ s The value of $\alpha$ is _______

An astronomical telescope consists of an objective of focal length 50 cm and eyepiece of focal length 2 cm is focused on the moon so that the final image is formed at the least distance of distinct vision (25 cm). Assuming angular diameter of the moon as $ \frac{1}{2^\circ} $ at the objective, the angular size of image is:

The drift speed of electrons in a conductor is estimated to be only a few mm s^-1, But on closing a circuit, how current is established almost instantly in an electric circuit?

The angular momentum for the electron in Bohr’s orbit is L. If the electron is assumed to revolve in second orbit of hydrogen atom, then the change in angular momentum will be

A coin placed on a rotating table just slips when it is placed at a distance of 1 cm from the center. If the angular velocity of the table is halved, it will just slip when placed at a distance of ----- from the centre:

A vessel of depth 'd' is half filled with oil of refractive index n₁ and the other half is filled with water of refractive index n₂. The apparent depth of this vessel when viewed from above will be-

α-particle, proton & electron have same kinetic energy. Select correct order of their de-Broglie wavelength.

In satellite communication, the uplink frequency band used is :

The current sensitivity of moving coil galvanometer is increased by 25%.This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be :

The mean free path of molecules of a certain gas at STP is 1500d, where d is the diameter of the gas molecules. While maintaining the standard pressure, the mean free path of the molecules at 373K is approximately

A planet has double the mass of the earth. Its average density is equal to that of the earth. An object weighing W on earth will weigh on that planet:

A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be

Match List I with List II

	LIST I		LIST II
A.	Mass of alpha particle	I.	1.00727 u
B.	Mass of proton	II.	4.00260 u
C.	Mass of neutron	III.	0.00055 u
D.	Mass of electron	IV.	1.00866 u

Choose the correct answer from the options given below:

The graph shows the variation of the magnification (m) produced by a thin lens with image distance (v). The focal length of the lens is: