List of top Physics Questions

An ideal gas is taken from point $ A $ to the point $ B $ , as shown in the $ p-V $ diagram, keeping the temperature constant. The work done in the process is :

If a vector 2î+3ĵ+8 is perpendicular to the vector 4ĵ-4î+α,then the value of α is:

Two uniform metal rods of lengths $ {{l}_{1}} $ and $ {{l}_{2}} $ and linear coefficients of expansion $ {{\alpha }_{1}} $ and $ {{\alpha }_{2}} $ respectively are connected to form a single rod of length $ ({{l}_{1}}+{{l}_{2}}). $ When the temperature of the combined rod is raised by t ?C, the length of each rod increases by the same amount. Then $ \left( \frac{{{\alpha }_{2}}}{{{\alpha }_{1}}+{{\alpha }_{2}}} \right) $ is:

A rifle shoots a bullet with a muzzle velocity of $ 500\,m{{s}^{-1}} $ at a small target 50 m away. To hit the target the rifle must be aimed: (Take $ g=10\,m{{s}^{-2}} $ )

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

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

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

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 :

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

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 :

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

If a person sitting in a train moving with a constant velocity along a straight line, throws a ball vertically upwards then

Two balls are projected simultaneously in the same vertical plane from the same point with velocities $ {{V}_{1}} $ and $ {{V}_{2}} $ with angles $ {{\theta }_{1}} $ and $ {{\theta }_{2}} $ respectively with the horizontal. If , the path of one ball as seen from the position of other ball is:

Consider the following statements A and B and identify the correct answers:

Equation of a gas in terms of pressure (P), absolute temperature, (T) and density (rf) is:

A cubical block of mass m rests on a rough horizontal surface. $ \mu $ is the coefficient of static friction between the block and the surface. A force mg acting on the cube at an angle $ \theta $ with the vertical side of the cube pulls the block. If the block is to be pulled along the surface, then the value cot ( $ \theta $ /2) is:

A nucleus of mass 218 amu in Free State decays to emit an a-particle. Kinetic energy of the a-particle emitted is 6.7 MeV. The recoil energy ( in MeV) of the daughter nucleus is:

A uniform cylindrical rod of mass M and length L is rotating with an angular speed $ \omega $ . The axis of rotation is perpendicular to its axis of symmetry and passes through one of its end faces. If the room temperature increases by t and the coefficient of linear expansion of the rod is $ \alpha $ , the magnitude of the change in its angular speed is:

A body executing SHM has a maximum velocity of $ 1m{{s}^{-1}} $ and a maximum acceleration of $ 4m{{s}^{-2}}. $ Its amplitude in metre is:

Angle (in rad) made by the vector $ \sqrt{3\widehat{i}}+\widehat{j} $ with the X-axis: