List of top Physics Questions

Two resistors of \(200\,\Omega\) and \(400\,\Omega\) are connected in series with a battery of \(100\,\text{V}\). A bulb rated at \(200\,\text{V}, 100\,\text{W}\) is connected across the \(400\,\Omega\) resistance. The potential drop across the bulb is _________ V.
An electromagnetic wave travels in free space along the \(x\)-direction. At a particular point in space and time, \[ \vec{B} = 2 \times 10^{-7}\,\hat{j}\,\text{T} \] is associated with this wave. The value of corresponding electric field \(\vec{E}\) at this point is __________ V/m.
In an LCR circuit at resonance:
Light of wavelength \(400\ \text{nm}\) falls on a metal surface. The energy of one photon is approximately: \[ \left( h=6.63\times10^{-34}\ \text{J s},\quad c=3\times10^8\ \text{m/s} \right) \]
In photoelectric effect, the stopping potential depends upon:
Electromagnetic waves are:
The ratio of electric field amplitudes and magnetic field amplitudes in an electromagnetic wave in vacuum is equal to:
Two long parallel wires carrying currents in the same direction will:
In wave optics, diffraction becomes more prominent when:
In Young's Double Slit Experiment, if the wavelength of light used is doubled while keeping all other quantities constant, the fringe width becomes:
A capacitor of capacitance \(50\ \mu\text{F}\) is connected to an AC source of frequency \(50\ \text{Hz}\). The capacitive reactance is approximately:
In an AC circuit, the rms value of current is \(5\ \text{A}\). The peak current is:

The focal length of a concave mirror is 20 cm. The distance at which an object should be placed to get a real image of same size is:

A current of 5 A flows through a wire for 10 minutes. The total charge passed is: 

An object of 10 kg at a height of 5 m has potential energy (\(g = 9.8\,m/s^2\)): 

The SI unit of power is: 

एक गतिपालक चक्र (फ्लाई व्हील) की कोणीय चाल 10 s में 600 rpm से 1200 rpm तक बढ़ाई जाती है। इस समय के दौरान, गतिपालक चक्र द्वारा पूर्ण (पूरे) किए गए परिक्रमणों की संख्या है: 
 

Two point charges 2q and q are placed at vertex A and centre of face CDEF of the cube as shown in figure. The electric flux passing through the cube is : 

A uniform metallic wire having resistance 4 $\Omega$ is bent to form a square loop (ABCD). A resistance of 2 $\Omega$ is connected between points B and D and a battery of 2 V is connected across points A and C as shown in the figure. Now the amount of current (I) is: ____.
In a two-stroke engine, the power stroke occurs compared to a four-stroke engine -
White smoke indicates -
A satellite is orbiting extremely close to the surface of a planet of average density $\rho$. The time period of revolution of the satellite depends only on $\rho$ as:
Four point masses each of mass $m$ are placed at the four corners of a square of side length $a$. The gravitational potential at the center of the square is:
A sphere of mass $M$ and radius $R$ falls through a glycerin column and attains a terminal velocity $v_1$. Another sphere of same material but radius $3R$ falls through it. Its terminal velocity $v_2$ is:
Two wires of same material have lengths in the ratio $1:2$ and diameters in the ratio $2:1$. If they are stretched by the same load force, the ratio of their extensions ($\Delta l_1 : \Delta l_2$) is: