List of top Physics Questions

The device that can act as a complete electronic circuit is
In a sample of radioactive material, what fraction of the initial number of active nuclei will remain disintegrated after half of a half-life of the sample?
In the figure below, the capacitance of each capacitor is $3 \mu F$. The effective capacitance between $A$ and $B$ is :
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is $\overrightarrow{F}$ .the net force on the remaining three arms of the loop is
A light ray going from air is incident (as shown in figure) at one end of a glass fibre (refractive index $ \mu = 1.5$) making an incidence angle of $60^\circ$ on the lateral surface,
so that it undergoes a total internal reflection. How much time would it take to traverse the straight fibre of length 1 km?
A particle of mass $2 \times 10^{-3}$ kg, charge $4 \times 10^{-3}$ C enters in an electric field of 5 V/m, then its kinetic energy after 10 s is
The numerical value of charge on either plate of capacitor C shown in figure
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B)$. The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (Where $V$ is the potential difference between cathode and anode)
Zener diode is used for
Ampere's circuital law is equivalent to
A body of mass 3 kg at rest is acted on by a force and the body moves through a distance 20 m in 5 s. Force on the body is
An arc of radius $r$ carries charge. The linear density of charge is $\lambda$ and the arc subtends an angle $\frac{\pi}{3}$ at the centre. What is electric potential at the centre?
A square surface of side $L$ meter in the plane of the paper is placed in a uniform electric field $E(volt/m)$ acting along the same plane at an angle $q$ with the horizontal side of the square as shown in figure. The electric flux linked to the surface, in units of volt $m$ is
A gas is considered ideal at
The heat capacity per mole of water is ($R$ is universal gas constant)
Assuming that the earth is a sphere of radius $R_{E}$ with uniform density, the distance from its centre at which the acceleration due to gravity is equal to $ \frac{g}{3} $ ($g$ = the acceleration due to gravity on the surface of earth) is
A particle is thrown vertically up with a certain velocity. Assuming the air resistance to be negligible, which one of the following represents the velocity (along $y$-axis) time (along $x$-axis) graph for the entire motion of the particle till it reaches back to the ground
$n$ identical drops, each of capacitance $C$ and charged to a potential $V$, coalesce to form a bigger drop. Then the ratio of the energy stored in the big drop to that in each small drop is
The relation between the time of flight of projectile $T_f$ and the time to reach the maximum height $t_m$ is
An object placed on an inclined plane starts sliding when the angle of incline becomes $30^{\circ}$. The coefficient of static friction between the object and the plane is
An object is projected so that its horizontal range $R$ is maximum. If the maximum height attained by the object is $H$, then the ratio of $R/H$ is
The elastic energy stored per unit volume in a stretched wire is
The mobility of free electrons (charge = $e$, mass = $m$ and relaxation time = $ \tau $ .) in a metal is proportional to
If the radius of a nucleus of mass number $3$ is $R$ ,then the radius of a nucleus of mass number $81$ is
Mean free path of a gas molecule is