List of top Physics Questions

A hypothetical experiment conducted to determine Youngs formula $ Y=\frac{\cos \theta {{T}^{x}}.\tau }{{{l}^{3}}} $ . If Y = Youngs modulus, T = time period, t = Torque and $ l= $ length, then find the value of $ x $ .
A heavy stone hanging from a massless string of length $15\,m$ is projected horizontally with speed $147 \,m/s$. The speed of the particle at the point where the tension in the string equals the weight of the particle is?
A single slit Fraunhofer diffraction pattern is formed with white light. For what wavelength of light, the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength $ 6500\, ?$ ?
Beyond which frequency, the ionosphere bends any incident electromagnetic radiation but do not reflect it back towards the earth?
A radioactive element has half-life period of $600$ yr. After $3000$ yr, what amount will remain?
A force of $6 \times 10^{6} Nm ^{-2}$ required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} kg m ^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \,ms ^{-2}$ )
A force of $10 \,N$ acts on a body of mass $20 \,kg$ for $10$ seconds. The change in its momentum is:
A fighter plane is moving in a vertical circle of radius V. Its minimum velocity at the highest point A of the circle will be
A particle moves with ,a velocity $ (5\hat{i}-3\hat{j}+6\hat{k}) $ m/s under the influence of a constant force $ \vec{F}=10\hat{i}+10\hat{j}+12\hat{k}N. $ The instantaneous power applied to the particle is:
The potential energy of a particle of mass $5 kg$ moving in the $x-y$ plane is given by $U=(-7 x+24 y) J \cdot x \& y$ being in metre. If the particle starts from rest from origin, then speed of particle at $t=2 s$ is :
Find the velocity of centre of mass of the system shown in the figure?
A stone of mass $m$ tied to a string of length $l$ is rotated in a circle with the other end of the string as the centre. The speed of the stone is $ \upsilon $ . If the string breaks, the stone will:
The first diffraction minimum due to single slit diffraction is $ \theta , $ for a light of wave length $ 5000\, ?$ . If the width of the slit is $ 1\times {{10}^{-4}}cm, $ then the value of $ \theta $ is:
The magnetic force on a point charge is $ \vec{F}=q(\vec{v}\times \vec{B}) $ Here, $ q= $ electric charge $ \vec{v}= $ velocity of point charge $ \vec{B}= $ magnetic field The dimensions of $\vec{B}$ is:
A body of mass $2 \,kg$ is placed on rough horizontal plane. The coefficient of friction between body and plane is $0.2$. Then:
Two stones are projected with same velocity $v$ at an angle $\theta \&(90-\theta) .$ If $H$ and $H_{1}$ are the greatest heights in the two paths, what is the relation between $R, H$ and $H_{1} ?$
A body initially at rest is moving with uniform acceleration $a$. Its velocity after $n$ second is $ \upsilon $ . The displacement of the body in $2 s$ is:
When a body moves with constant speed in a circular path, then:
A disc of mass $100\, g$ is kept floating horizontally in air by firing bullets, each of mass $5\, g$ with the same velocity at the same rate of $10$ bullets per second. The bullets rebound with the same speed in opposite direction, the velocity of each bullet at the time of impact is:
An air column in a pipe which is closed at one end, will be in resonance with the vibrating body of frequency $166\, Hz$; if the length of the air column is
A convex lens has mean focal length of $20\, cm$. The dispersive power of the material of the lens is $0.02$. The longitudinal , chromatic aberration for an object at infinity is
A wave equation which gives the displacement along the direction is given by $ y=0,001\text{ }sin\text{ }(100r+x) $ where, $ x $ and y are in metre and $ t $ in second. This equation represents a wave
A sample of an ideal gas occupies a volume $V$ at pressure $p$ and absolute temperature $T$. The mass of each molecule is $m$, then the density of the gas is
$ A\,220\,V,100\,W $ bulb is joined with a $110\, V$ supply. The power consumed by the bulb is
At $273^{\circ} C, $ the emissive power of a perfect black body is R. What is its value at $ 0^{\circ} C, $ ?