List of top Physics Questions

The average self-induced emf in a 25mH solenoid when the current in it falls from 0.2 A to 0 A in 0.01 second, is

The average depth of Indian ocean is about $3000\, m$. The fractional compression, $\frac{\Delta V}{V}$ of water at the bottom of the ocean is (Given : Bulk modulus of the water $= 2.2 ? 10^9 \,N \,m^{-2}$ and $g = 10 \,m\, s^{-2}$)

The area under acceleration-time graph represents the

The area of cross-section of a wire of length 1.1 m is 1 $mm^2$. It is leaded with 1 kg of Young's modulus of copper is $1.1\times10^i Nm^\circ$ , then the increase in length will be $(ifg = 10{ms^-2})$

The angular dispersion will be maximum in the following pairs of colours is

The angle of minimum deviation of a prism depend upon:

The angle of dip at a place on the earth's surface gives

The amplitude of a damped oscillator becomes one half after $t$ second. If the amplitude becomes $(1/n)$ after $3 \,t$ second, then $n$ is equal to

The adjacent graph shows the extension $(\Delta l)$ of a wire of length 1 m suspended from the top of a roof at one end with a load W connected to the other end. If the cross-sectional area of the wire is $10^{-6} m^2 , $ calculate the Young's modulus of the material of the wire.

The acronym LASER stands for

The activity of a radioactive sample is measured as $N_{0}$ counts per minute at $t = 0$ and $N_{0}/e$ counts per minute at $t = 5$ minutes. The time (in minutes) at which the activity reduces to half its value is

The accuracy in the measurement of the diameter of hydrogen atom as $1.06 \times 10^{-10}$ m is

The acceleration due to gravity at the poles and the equator is $g_p$ and $g_e$ respectively. If the earth is a sphere of radius $R_E$ and rotating about its axis with angular speed 0), then $g_p - g_e$ is given by

The absolute zero is the temperature at which -

The $6563 \,?$ $H_\alpha$ line emitted by hydrogen in a star is found to be red-shifted by $15\,?$. The speed with which the star is receding from the earth is

Tension and surface tension have

Ten one-rupee coins are put on top of each other on a table. Each coin has a mass $m$. The force on the $7^{th}$ coin (counted from the bottom) due to all the coins on its top is

$T_1,T_2$ are time periods of oscillation of a block individually suspended to spring of force constants $K_1,K_2$ respectively same block is suspended to parallel combination of same two springs. Its time period is

Susceptibility is large and positive for

Surface mass density of a disc is given by $\sigma = kr^2$ (where r is distance from centre) find moment of inertia about axis passing through the centre and perpendicular to plane -

Steel is preferred for making springs over copper, because

Statement 1. Unit of gas constant is joule mole$^{-1}$ kelvin$^{-1}$. Statement 2. Dimensional formula for gas constant is $[ML^2T^2K^{-1} mol^{-1}].$

Starting with a sample of pure $ ^{66} Cu, $ 7/8 of its decays into Zn in 15 min. The corresponding half-life is

Spot out the odd one.

Speeds of two identical cars are U and 4U at a specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is