List of top Physics Questions

A rigid container with thermally insulated walls contains a coil of resistance 100 $\Omega$, carrying current 1 A. Change in internal energy after 5 min will be

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

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

A particle on the trough of a wave at any instant will come to the mean position after a time : ($T =$ time period)

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

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 relationship between the force $F$ and position $x$ of a body is as shown in figure. The work done in displacing the body from $x = 1 \, m $ to $x = 5 \, m$ will be :

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 induction coil works on the principle of :

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 :

In an experiment with sonometer a tuning fork of frequency $256\, Hz$ resonates with a length of $25\, cm$ and another tuning fork resonates with a length of $16\, cm$. Tension of the string remaining constant the frequency of the second tuning fork 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 :

The ratio of velocity of sound in hydrogen and oxygen at STP is :

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

Density of liquid in CGS system is $ 0.625\,g/cm^{3} $ What is its magnitude in SI system?

A network of four capacitors of capacity equal to C₁=C,C₂=2C,C₃=3C and C₄=4C are connected to a battery as shown in the figure. The ratio of the charges on C₂ an C₄ is

A ball of mass m moves with speed $v$ and it strikes normally with a wall and reflected back normally. If its time of contact with wall is $t$, then find force exerted by ball on the wall.

Three particles each of mass 1 kg are placed at the corners of a right angled triangle AOB, O being the origin of the coordinate system (OA and OB along positive X- direction and positive Y- direction). If OA=OB=1m, the positive vector of the centre of mass (in metres) is:

Two simple harmonic motions are represented by the equations $y_{1}=0.1\,sin\left(100\,\pi t+\frac{\pi}{3}\right)$ and $y_{2}=0.1\,cos\,\pi\,t.$ The phase difference of the velocity of particle 1, with respect to the velocity of particle 2 is :

An automobile travelling at 50 km/h, can be stopped at a distance of 40 m by applying brakes. If the same automobile is travelling at 90 km/h, all other conditions remaining same and assuming no skidding, the minimum stopping distance in metres is:

When an unpolarized light of intensity $I_0$ is incident on a polarizing sheet, the intensity of the light which does not get transmitted is :

Two coherent sources of intensity ratio $ \beta $ interfere. Then the value of $ (I_{\max }-I_{\min })/(I_{\max }+I_{\min }) $ is:

If a transformer of an audio amplifier has output impedance 8000 0 and the speaker has input impedance of 80, the primary and secondary turns of this transformer connected

The nuclei of which one of the following pairs of nuclei are isotones?