List of top Physics Questions

$ 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, $ ?
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from
A conducting wire of cross-sectional area 1 $ c{{m}^{2}} $ has $ 3\times {{10}^{23}} $ charge carriers per $ metr{{e}^{3}} $ . If wire carries a current $24 \,mA$, then rift velocity of carriers is
The energy gap between the valence band and the conduction band for a material is 6 e V. The material is
Velocity of sound waves in air is $330\, m/s.$ For a particular sound in air, a path difference of $40\, cm$ is equivalent to a phase difference of $1.6\, \pi$. The frequency or the wave is:
Five particles of mass $2\, kg$ are attached to the rim of a circular disc of radius $0.1\, m$ and negligible mass. Moment of inertia of the system about the axis passing through the centre of the disc and perpendicular to its place is :
A sphere of diameter $0.2\, m$ and mass $2\, kg$ is rolling on an inclined plane with velocity $ v=0\, . 5\, m/s.$ The kinetic energy of the sphere is:
An ice-cube of density $900\, kg / m ^{3}$ is floating in water of density $1000\, kg / m ^{3}$. The percentage of volume: of ice-cube outside the water is :
The radius of the convex surface of plano-convex lens is $20\, cm$ and the refractive index of the material of the lens is $1.5 .$ The focal length is :
The length, breadth and thickness of a block are given by $l=12\, cm,\, b=6\, cm$ and $t=2.45\, cm$. The volume of the block according to the idea of significant figures should be :
A plane metallic sheet is placed with its face parallel to lines of magnetic induction $B$ of a uniform field. A particle of mass $m$ and charge $q$ is projected with a velocity $v$ from a distance $d$ from the plane normal to the lines of induction. Then, the maximum velocity of projection for which the particle does not hit the plate is :
The torque of force $ \vec{F}=(2\hat{i}-3\hat{j}+4\hat{k}) $ newton acting at a point $ \vec{r}=(3\hat{i}+2\hat{j}+3\hat{k}) $ metre about origin is:
A particle is moving under the influence of a force which is fixed in magnitude and acting at an angle $ \theta $ in the direction of motion. The path described by the particle is:
$300 \,J$ of work is done in sliding a $2 \,kg$ block up an inclined plane of height $10\,m$. The work done against friction is (Take $ g=10\,m/{{s}^{2}} $ )
Suppose refractive index $ \mu $ is given as $ \mu =A+B/{{\lambda }^{2}}, $ where $A$ and $B$ are constants and $X$ is wavelength then the dimensions of $B$ are same as that of:
A projectile is fired at $ 30{}^\circ $ with momentum $p$. Neglecting friction, tine change in kinetic energy, when it returns back to the ground, will be:
If a car at rest accelerates uniformly and attains a speed of $72 \,km/hr$ in $10 \,s$, then it covers a distance of:
A ball of mass $0.25 \,kg$ attached to the ends of a string of length $1.96 \,m$ is rotating in a horizontal circle. The string will break, if tension is more than $25\, N$. What is the maximum velocity with which the ball can be rotated?
In uniform circular motion, the factor that remains constant is:
If an iron ball and a wooden ball of the same radius are released from a height $ h $ in vacuum, then time taken by both of them, to reach the ground will be:
A common example of $\beta^{-}$decay is $15 P^{32} \rightarrow 16 S^{32}+x+y$ Then $x$ and $y$ stands for
A hot body at temperature $T$ losses heat to the surrounding temperature $T_{S}$ by radiation. If the difference in temperature is small then, the rate of loss of heat by the hot body is proportional to
Which one of the following statement is correct in the case of light emitting diodes?
A $0.5\, kg$ ball moves in a circle of radius $0.4\, m$ at a velocity of $4\, m / s$. The centripetal force on the ball is