List of top Physics Questions

A wire of length $l$ carries a steady current. It is bent first to form a circular plane loop of one turn. The magnetic field at the centre of the loop is $B$. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same is
Pressure inside two soap bubbles are $1.01$ and $1.02$ atmospheres. Ratio between their volumes is
Assuming earth to be a sphere of a uniform density, the value of $g$ in a mine $100\, km$ below the earth surface will be
The angular speed of earth, so that the object on equator may appear weight less, is $ (g=10)\,m/s^{2}$ , radius of earth $6400\,km$
Mass of moon is $ 1/81 $ times that of earth and its radius is $ 1/4 $ the radius of earth. If escape velocity on the surface of the earth is $11.2\,km/s $ . Then the value of escape velocity at surface of the moon will be
A block slides down an inclined plane making an angle $ \theta =30^{\circ}$ with the horizontal with an acceleration $ \frac{g}{4} $ , then coefficient of frictions will be
A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $ 1\,m/s$ so as to have same K.E. as that of the boy. The original speed of the man will be
If a cycle wheel of radius $4\,m $ completes one revolution in two seconds. Then acceleration of the cycle will be
A cyclist moves in a circular track or radius $ 100\,m $ . If the coefficient of friction $ 0.2 $ . Then the maximum speed with which the cyclist can take a turn without leaving inwards, is
A wheel of mass $ 10\,kg $ has a moment of inertia of $ 160\,kg-m^2 $ about its own axis, the radius of gyration will be
In intrinsic semiconductor at room temperature, number of electrons and holes are:
A body of mass $M$ moving with velocity $V$ explodes into two equal parts. If one comes to rest and the other body moves with velocity $v$, what would be the value of $v$ ?
Temperature and pressure of $2\, g$ oxygen are $27^{\circ} C$ and $76\, cm\, Hg$, then volume of the gas is:
In which condition a real gas behaves as an ideal gas?
At a place earth's magnetic field $5 \times 10^{5} Wb / m ^{2}$ is acting perpendicular to a coil of radius $R=5 \,cm$. If $\mu_{0} / 4 \pi=10^{-7}$, then how much current is induced in circular loop?
Colour of a star depends upon
A particle is revolving in a circle of radius $R$. If the force acting on it is inversely proportional to $R$, then the time period is proportional to
For liquid to rise in a capillary tube, the angle of contact should be
The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is $v$. The orbital velocity of a satellite orbiting at an altitude of half of the radius, is
$1 \,Kcal$ of heat flowing through a rod of iron. When the rod is cut down to $4$ pieces then what will be the heat flowing through each piece having same differential temperature?
Speed in kilometer per hour in S.I. unit is represented as
S.I. unit of velocity is
A car of mass $ m $ moves in a horizontal circular path of radius $ r $ meter. At an instant its speed is $ v\,m/s $ and is increasing at a rate a $ m/s^{2} $ , then the acceleration of the car is:
An object of mass $40\, kg$ and having a velocity $4\, m/s$ collides with another object $ \left( m=60\,kg \right) $ having velocity $2\, m/s$. The collision is perfectly inelastic. The loss in energy is:
An iron rod of length $2 \,m $ and area of cross-section $ 50\,mm^{2}$ stretches by $ 0.5\,mm $ , when a mass of $250\, kg$ is hung from its lower end. The Young's of iron rod is: