List of top Physics Questions

Let $\eta_1$ is the efficiency of an engine at $T _1=447^{\circ} C$ and $T _2=147^{\circ} C$ while $\eta_2$ is the efficiency at $T _1=947^{\circ} C$ and $T _2=47^{\circ} C$ The ratio $\frac{\eta_1}{\eta_2}$ will be :

In a thermodynamic process work done by gas is 1000 J & heat supplied is 200 J. Find change in internal energy of gas?

Pressure for polytropic process P varies with volume V as P=av-3, find out the bulk modulus.

Ratio between rms speed of Ar to the most probable speed of \(O^2\) at \(27\degree C\) is

For two different photosensitive materials having work function and 2 respectively, are illuminated with light of sufficient energy to emit electrons. If the graph of stopping potential versus frequency is drawn, for these two different photosensitive materials the ratio of slope of graph for these two materials is

Light wave travelling in air along $x$-direction is given by $E_y=540 \sin \pi \times 10^4(x-c t) Vm ^{-1}$ Then, the peak value of magnetic field of wave will be (Given $c =3 \times 10^8 ms ^{-1}$ )

Force acting on a particle moving along the x - axis is given by F = (2 + 3x)i. The work done by this force from x = 0 to x = 4 m is

A body of mass $05\, kg$ travels on straight line path with velocity $v=\left(3 x^2+4\right) m / s$ The net workdone by the force during its displacement from $x =0$ to $x =2 \,m$ is :

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Earth has atmosphere and moon doesn’t
Reason (R): escape speed on moon is less than that of Earth.
In the light of the above statements, choose the correct answer from the options given below:

A planet has density same as that of Earth and mass is twice that of Earth. If the weight of an object on Earth is "W" then the weight on the planet is:

Two identical particles each of mass m, move in circular path due to their own mutual gravitational force. Find the velocity of the particle if the radius of the circular path is a.

An object weighs 200N at the surface of earth. Find the weight at a depth of \(\frac{R}{2}\) , where R is radius of earth

Find tension in string if all surfaces are smooth and string is massless.

A small square loop of wire of side $l$ is placed inside a large square loop of wire $L ( L >>l)$ Both loops are coplanar and their centers coincide at point $O$ as shown in figure The mutual inductance of the system is :

A uniform current carrying cylindrical wire carries current \(I\) having radius 'a'. Magnetic field with distance x varies with relation given:

E = E₀ sin (\(\omega\)t – kx)
B = B₀ sin (\(\omega\)t – kx), then ratio of energy density of electric field to magnetic field is : 

The resistance of a wire is $5 \Omega$. It's new resistance in ohm if stretched to 5 times of it's original length will be:

Find the current flowing in 3Ω resistor in the given circuit

If momentum $[ P ]$, area $[ A ]$ and time $[ T ]$ are taken as fundamental quantities, then the dimensional formula for coefficient of viscosity is :

Which of the following physical quantities have the same dimensions?

Wire A and B have their Young’s moduli in the ratio 1:3, area of cross section in the ratio of 1:2 and lengths in ratio of 3:4. If same force is applied on the two wires to elongate then ratio of elongation is equal to

What is the center of gravity of a semi-circular disc of radius (R)?