List of top Physics Questions

The physical quantities not having same dimensions are
The kinetic energy of an electron is $ 5\,\,eV $ . Calculate the de-Broglie wavelength associated with it ( $ h=6.6\times {{10}^{-34}}\,\,Js $ , $ {{m}_{e}}=9.1\times {{10}^{-31}}kg $ ):
A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of $ 50\,\,m/s $ , the frequency of sound to be heard directly from the siren is:
A resonance air column of length $ 40\,\,cm $ resonates with a tuning fork of frequency $ 450\,\,Hz $ . Ignoring end correction, the velocity of sound in air will be:
The work done in pulling up a block of wood weighing $ 2\,\,kN $ for a length of $ 10\,\,m $ on a smooth plane inclined at an angle of $ {{15}^{o}} $ with the horizontal is:
The peak value of alternating current is $ 5\sqrt{2} $ ampere. The mean square value of current will be:
In junction diode, the holes are because of:
The length of a simple pendulum executing simple harmonic motion is increased by $21\%$. The percentage increase in the time period of the pendulum of increased length is
The image formed by an objective of a compound microscope is
The electrostatic capacitance depends on:
The electric potential between a proton and an electron is r given by $V = V_0 in\frac{r}{r_0}, where r_0$ is a constant. Assuming Bohr's model to be applicable, write variation of rn with n, n being the principal quantum number.
The displacement of a particle varies according to the relation $x = 4(cos\, pt + sin \,pt).$ the amplitude of the particle is
Reverse bias applied to a junction diode
The slope of plate characteristic and mutual characteristic curves of a triode valve is $0.02\, mA / V$ and $1 \,mA / V$. The amplification factor of triode valve is:
In the following common emitter configuration an $n p n$ transistor with current gain $\beta=100$ is used. The output voltage of the amplificr will be
In fission of $U-235$, the percentage of mass convened into energy is about:
The focal length of objective and eye piece of a telescope are $ {{f}_{0}} $ and $ {{f}_{e}} $ respectively. Then its magnification will be:
If the critical angle for total internal reflection from a medium to vacuum is $ 30{}^\circ $ , then the speed of light in the medium is
A prism has a refracting angle of $ 60{}^\circ $ . If it produces a minimum deviation of $ 30{}^\circ $ in an incident ray, the angle of incidence is
The ratio of radii of two spheres of same material is $1 : 4$, then the ratio of their heat capacities is
A liquid has only
A solid sphere is rolling without slipping on a horizontal surface. The ratio of its rotational kinetic energy and translational kinetic energy is:
Bernoulli's equation is a consequence of conservation of
The stars twinkle while the planets do not. The stars are much bigger in size than the planets.
Microwave communication is preferred over optical communication. Microwaves provide large number of channels and bandwidth compared to optical signals.