List of top Physics Questions

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
Identify the false statement
A Carnot cycle has the reversible processes in the following order
A cord is used to lower vertically a block of mass $M$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is
A battery of emf 2.1 V and internal resistance is shunted for 5 s by a wire of constant resistance 0.02 $ \Omega $ ,mass 1 g and specific heat 0.1 cal/g/?C. The rise in the temperature of the wire is
A torque of $10^{-5}$ Nm is required to hold a magnet at $90^\circ$ with the horizontal component of the earth's magnetic field. The torque required to hold it at $30^\circ$ will be
As resistance in a series resonant circuit increases (i) sharpness of resonance decreases (ii) bandwidth increases
In a sonometer experiment, when the tension is changed by $10\, kg \, wt$, fundamental frequency emitted increases by $50 \%$ . Original tension in kg wt is
Angular frequency of an electron in Bohr atom with quantum number n is proportional to
Excited H atom emits a photon of energy $12.1 \, eV$, orbital angular momentum of electron changes by
Least stable structure in liquid crystalline state is observed in
Raindrops falling down attain limited value of velocity because of
A voltmeter can read up to $V$ volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is
An inductor coil when connected to a $12 \, V$ batt.ery draws a steady current $6 \, A$. This coil when connected in series with a capacitor and an $AC$ source of $10 \, V$, current is in phase with applied voltage. $AC $ meter included in the circuit reads