List of top Physics Questions

A lens behaves as a converging lens in air and diverging lens in water. The refractive index of the material of the lens is

A diatomic gas is heated at constant pressure. What fraction of the heat energy is used to increase the internal energy?

In interference pattern, the energy is

In a biprism experiment by using light of wavelength $ 5000\overset{\text{o}}{\mathop{\text{A}}}\,, $ 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is

In a stationary wave represented by $Y =2 a \cos kx \sin \omega t$ the intensity at a certain point is maximum when

One of the causes of the breadth of the spectral lines is

In the circuit shown the equivalent resistance between $A$ and $B$ is

Each of the properties if sound in List-I primarily depends on one of the quantities in List-II. Select the correct answer (matching List-I with List-II) as per code given below the lists:

Gravitational field is

According to Bohrs theory of hydrogen atom, for the electron in the $n^{\text {th }}$ allowed orbit the (i) linear momentum is proportional to $1 / n$ (ii) radius is proportional to $n$ (iii) kinetic energy is proportional to $1 / n^2$ (iv) angular momentum is proportional to $n$ Choose the correct option from the codes given below:

According to Maxwells law of distribution of velocities of molecules, the most probable velocity is

The energy of an X-ray photon of wavelength $1\, ?$ is $\left( h =6.6 \times 10^{34} J - s \right)$

Good emitters are good absorbers is a statement concluded from

Electron volt is a unit of

A telescope has an objective of focal length $100\, cm$ and an eye-piece of focal length $5\, cm$. What is the magnifying power of the telescope when it is in normal adjustment ?

A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average KE of helium atoms is

A choke is preferred to a resistance for limiting current in AC circuit because

A convex lens of glass $(\mu=1.5)$ has a focal length of $8\, cm$ when placed in air. What is the focal length of lens when it is immersed in water $\left(\mu=\frac{4}{3}\right) ?$

An object is placed at the focus of a convex mirror. If its focal length is $20\, cm,$ the distance of mirror is

The current through a bulb is increased by $1 \%$. Assuming that the resistance of the filament remains unchanged the power of the bulb will

You are given two resistances $R_{1}$ and $R_{2} .$ By using them singly, in series and in parallel, you can obtain four resistances of $1.5\, \Omega, 2\, \Omega, 6\, \Omega$ and $8\, \Omega$. The values of $R_{1}$ and $R_{2}$ are

Two waves are represented by $y_1 = 4 \sin \, 404 \pi t$ and $y_2 = 3 \sin \, 400 \pi t.$ Then

A paramagnetic substance is placed in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

A rectangular coil of $100$ turns and size $0.1 \times 0.05\, m$ is placed perpendicular to a magnetic field of $0.1\, T$. The induced emf when the field drops to $0.05\, T$ in $0.05\, s$ is