List of top Physics Questions

A closely wound flat circular coil of $25$ turns of wire has diaineter of $10\, cm$ which carries current of $4\, A$, the flux density at the centre of a coil will be
A particle has an initial velocity $3\hat{i}+4\hat{j}$ and an acceleration of $0.4\hat{i}+0.3\hat{j}$. Its speed after $10\, s$ is
Due to the presence of the current $I_1$ at the origin
The transition from the state $n = 4$ to $n = 3$ in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
The magnitude of the magnetic field $(B)$ due to loop $ABCD$ at the origin $(O)$ is
A $p-n$ junction $(D)$ shown in the figure can act as a rectifier. An alternating current source $(V)$ is connected in the circuit.
The current $(I)$ in the resistor $(R)$ can be shown by
The logic circuit shown below has the input waveforms $A$ and $B$ as shown. Pick out the correct output waveform.
The height at which the acceleration due to gravity becomes $\frac{g}{9}$ (where $g$ = the acceleration due to gravity on the surface of the earth) in terms of $R$, the radius of the earth is
Consider a rubber ball freely falling from a height $h\, =\, 4.9\, m$ onto a horizontal elastic plate. Assume that the duration of collision is negligible and the collision with the plate is totally elastic. Then the velocity as a function of time the height as function of time will be :
A band playing music at a frequency f is moving towards a wall at a speed $v_b$. A motorist is following the band with a speed $v_m$. If v be the speed of the sound, the expression for beat frequency heard by motorist is
An eye specialist prescribes spectacles having a combination of a convex lens of focal length $40 \,cm$ in contact with a concave lens of focal length $25\, cm$. The power of this lens combination will be
A lens behaves as a converging lens in air and diverging lens in water. The refractive index of the material of the lens is
A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?
In interference pattern, the energy is
In a biprism experiment by using light of wavelength $ 5000\overset{\text{o}}{\mathop{\text{A}}}\,, $ 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is
In a stationary wave represented by $Y =2 a \cos kx \sin \omega t$ the intensity at a certain point is maximum when
One of the causes of the breadth of the spectral lines is
In the circuit shown the equivalent resistance between $A$ and $B$ is
Each of the properties if sound in List-I primarily depends on one of the quantities in List-II. Select the correct answer (matching List-I with List-II) as per code given below the lists:
Gravitational field is
According to Maxwells law of distribution of velocities of molecules, the most probable velocity is
According to Bohrs theory of hydrogen atom, for the electron in the $n^{\text {th }}$ allowed orbit the (i) linear momentum is proportional to $1 / n$ (ii) radius is proportional to $n$ (iii) kinetic energy is proportional to $1 / n^2$ (iv) angular momentum is proportional to $n$ Choose the correct option from the codes given below:
The energy of an X-ray photon of wavelength $1\, ?$ is $\left( h =6.6 \times 10^{34} J - s \right)$
Good emitters are good absorbers is a statement concluded from
Electron volt is a unit of