List of top Physics Questions asked in JEE Main

The rms value of conduction current in a parallel plate capacitor is $69\, \mu A$ The capacity of this capacitor, if it is connected to $230 \, V$ ac supply with an angular frequency of $600\, rad / s$, will be :
In figure $(A)$, mass ' $2\, m$ ' is fixed on mass ' $m$ ' which is attached to two springs of spring constant $k$ In figure $(B)$, mass ' $m$ ' is attached to two spring of spring constant ' $k$ ' and ' $2\, k$ ' If mass ' $m$ ' in $(A)$ and $(B)$ are displaced by distance ' $x$ ' horizontally and then released, then time period $T_1$ and $T_2$ corresponding to (A) and (B) respectively follow the relation
If the height of the tower used for LOS communication is increased by 21%, the percentage change in range is?
If half life for a radioactive decay reaction is T. Find the time after which \(\frac{7}{8}th\) of initial mass decays
The height of liquid column raised in a capillary tube of certain radius when dipped in liquid A vertically is, $5 cm$ If the tube is dipped in a similar manner in another liquid $B$ of surface tension and density double the values of liquid $A$, the height of liquid column raised in liquid $B$ would be ______$m$
The pressure $( P )$ and temperature $( T )$ relationship of an ideal gas obeys the equation $PT ^2=$ constant The volume expansion coefficient of the gas will be :
The output waveform of the given logical circuit for the following inputs $A$ and $B$ as shown below, is :
The output waveform of the given logical circuit for the following inputs A and B

A source of sound is moving away from a stationary observer with constant velocity 40 m/s. Find frequency heard by observer, if original frequency of source is 400 Hz and speed of sound in air is 360 m/s

In AM modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be $6 V$ and $2 V$ respectively The modulation index is

Two projectiles

Two projectiles A and B are projected from the same point on ground with same speed of projection as shown. Find the ratio of maximum height attained by A to that of B.

If light is passing through a medium of critical angle 45°, then the wave speed will be
Choose correct graph of resistivity and temperature for semi-conductor material.
A wire of length 2 m, radius of cross-section 20 mm and Young's Modulus 2×1011 N/m is subjected to a force of 62.8 kN.The change in length of the wire is p×10–5 (in m). Find P. 

Find period of oscillation if mass 'm' is displaced parallel to earth's surface & released?

A sphere of density ρ & mass m is moving down with constant velocity in viscous liquid of density ρ0. Find out viscous force on sphere
If the height of the tower used for L.D.S is increased by 21% then percentage change in range is?
A body is doing SHM with amplitude A. When it is at \( x =+ \frac{A}{2}\) , find ratio of kinetic energy to potential energy.
Time taken by light to travel in two different materials $A$ and $B$ of refractive indices $\mu_{ A }$ and $\mu_{ B }$ of same thickness is $t _1$ and $t _2$ respectively If $t_2-t_1=5 \times 10^{-10} s$ and the ratio of $\mu_{ A }$ to $\mu_{ B }$ is $1: 2$ Then the thickness of material, in meter is: (Given $v_A$ and $v_B$ are velocities of light in $A$ and $B$ materials respectively)
A circular ring is placed in magnetic field of 0.4 T. Suddenly its radius starts shrinking at the rate of 1 mm/s. Find the induced emf in the ring at r = 2 cm.
Assertion (A): An electrical dipole is enclosed in a closed gaussian surface. The total flux through the enclosed surface is zero. 
Reason (R): Net charge inside the enclosed surface is zero.
Equation of progressive wave is \(y = A\text{ sin}(160t-0.5x)\). Let the speed of the wave be 10x then, find x.
Electric field due to a dipole at a equatorial point depends upon r-n . Value of n is
If the length of a conductor is increased by 20% and cross-sectional area is decreased by 4% ,then calculate the percentage change in the resistance of the conductor.
A wire of length 2 m, radius of cross-section 20 mm and Young's Modulus 2×1011 N/m is subjected to a force of 62.8 kN.The change in length of the wire is p×10–5 (in m). Find P. 

A particle is projected at an angle of 30° with ground with speed 40 m/s. The speed of the particle after 2 s is (use g=10 ms-2)