List of top Physics Questions

The equation of stationary wave along a stretched string is given by $y=5\, \sin \frac{\pi x}{3} \cos 40\, \pi t$, where, $x$ and $y$ are in $cm$ and $t$ in second. The separation between two adjacent nodes is :

A perfect gas is found to obey the relation $P V^{3 / 2}=$ constant during an adiabatic process. If such a gas initially at a temperature $T$, is compressed to half of its initial volume, then its final temperature will be :

Which of the following is not an inelastic collision?

A force $F$ is given by $F=a t+ b t^{2}$, where, $t$ is time. What are the dimensions of $a$ and $b$ ?

White light is incident on one of the refracting surfaces of a prism of angle $5^\circ$. If the refractive indices for red and blue colours are $1.641$ and $1.659$ respectively, the angular separation between these two colours when they emerge out of the prism is

The unit of Stefan's constant is

When a charged particle moving with velocity $\vec{v}$ is subjected to a magnetic field of induction $\vec{B}$, the force on it is non-zero. This implies the :-

The graph between object distance u and image distance v for a lens is given below. The focal length of the lens is

The equivalent resistance between the points P and Q in the network shown in the figure is given by:

Some physical constants are given in List 1 and their dimensional formulae are given in List 2.Match the correct pairs in the lists:

Which is not the unit of electric field?

Which of the following rays can be polarised?

Quantum nature can prove :

Huygens wave theory cant explain:

Vector which is perpendicular to $ a\,\cos \,\theta \,\hat{i}+b\,\sin \,\theta \,\,\hat{j} $ is

Electron of mass $m$ and charge $q$ is travelling with a speed $v$ along a circular path of radius $r$ at right angles to a uniform magnetic field of intensity $B$. If the speed of the electron is doubled and the magnetic field is halved the resulting path would have a radius:

The induction coil works on the principle of :

If a liquid does not wet glass, its angle of contact is :

The disc of a siren containing $60$ holes rotates at a constant speed of $360\, rpm$. The emitted sound is in unison with a tuning fork of frequency :

An electron moves at right angle to a magnetic field of $1.5 \times 10^{-2} T$ with a speed of $6 \times 10^{7} m / s$. If the specific charge of the electron is $1.7 \times 10^{11} C / kg$. The radius of the circular nath will he

Infrared radiation was discovered in $1800$ by :

From the top of a tower of two stones, whose masses are in the ratio $1 : 2$ are thrown on straight up with an initial speed $u$ and the second straight down with the same speed $u$. Then neglecting air resistance :

The work done in carrying a charge $q$ once round a circle of radius $r$ with a charge $Q$ at the centre is :

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f .The current leads the voltage by 45$^{\circ}$. The value of C is

The wave theory of light, in its original form, was first postulated by-