List of top Physics Questions

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?

The ratio of the dimensions of Planck's constant and that of the moment of inertia is the dimension of:

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

Fission of nuclei is possible because the binding energy per nucleon in them:

The temperature of inversion of a thermocouple is 620°C and the neutral temperature is 300°C.what is the temperature of cold junction?

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:

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:

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 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:

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 stationary body of mass m explodes into the three parts having masses in the ratio 1:3:3. The two fractions with equal masses move at right angles to each other with a velocity of $ 1.5\,m{{s}^{-1}}. $ The velocity of the third part is:

If a car at rest accelerates uniformly and attains a speed of $72 \,km/h$ in $10 \,s$, then it covers a distance of