List of top Physics Questions

A missile is fired for maximum range with an initial velocity of $20\, m/s$. If $g = 10 \,m/s^2$, the range of the missile is
The half life of a radioactive isotope $X$ is $50$ years. It decays to another element $Y$ which is stable. The two elements $X$ and $Y$ were found to be in the ratio of $1 : 15$ in a sample of a given rock. The age of the rock was estimated to be
A thermocouple of negligible resistance produces an e.m.f. of $ 40\, \mu V/^{\circ}C$ in the linear range of temperature. A galvanometer of resistance $10$ ohm whose sensitivity is $1 \, \mu A/division$, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be
If power dissipated in the $9\, \Omega$ resistor in the circuit shown is $36$ watt, the potential difference across the $2\, \Omega$ resistor is
In the case of an inductor
Rainbow is a phenomenon due to
Resultant force acting on a diamagnetic material in a magnetic field is in direction
A diver at a depth of $12\, m$ in water $\bigg(\mu = \frac{4}{3}\bigg)$ sees the sky in a cone of semi vertical angle
The charge on the capacitor of capacitance $C$ shown in the figure below will be
The magnetic field at the point of intersection of diagonals of a square wire loop of side $L$ carrying a current $I$ is
An ammeter reads upto $1A$. Its internal resistance is $0.81\, \Omega$ . To increase the range to $10\, A$, the value of the required shunt is
A boy standing at the top of a tower of $20\,m$ height drops a stone. Assuming $g = 10\, ms^{-2},$ the velocity with which it hits the ground is
A current of $2\,A$ flows through a $2\, \Omega$ resistor when connected across a battery. The same battery supplies a current of $0.5\, A$ when connected across a $9\, \Omega$ resistor. The internal resistance of the battery is
ln the nuclear reaction $ _7^{14} N + X \rightarrow _6^{14} C + _1^1 H, $ the $X$ will be
A transformer works on the principle of
1 curie represents
A neutron, a proton, an electron and an $\alpha$-particle enter a region of uniform magnetic field with the same velocities. The magnetic field is perpendicular and directed into the plane of the paper. The tracks of the particles are labelled in the figure. The electron follows the track
A particle executing a simple harmonic motion has a period of $6\,sec$. The time taken by the particle to move from the mean position to half the amplitude, starting from the mean position is.
The deflection in a moving coil galvanometer is reduced to half when it is shunted with a $40\, \Omega$ coil. The resistance of the galvanometer is
Sky wave propagation is used in
The frequency of an $FM$ transmitter without signal input is called
The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a catalyst is
A small uncharged metallic sphere is positioned exactly at a point midway between two equal and opposite point charges. If the sphere is slightly displaced towards the positive charge and released then
In the following equation, x, t and F represent respectively, displacement, time and force : $F = a+bt + \frac{1}{c+dx} + A \,sin \left(\omega t + \phi\right).$ The dimensional formula for $A?d$ is
The ratio of minimum wavelengths of Lyman and Balmer series will be