List of top Physics Questions asked in JEE Main

A current of $15 \,mA$ flows in the circuit asshown in figure The value of potentialdifference between the points $A$ and $B$ will be

Figures (a), (b), (c) and (d) show variation of force with time The impulse is highest in figure

Given below are two statements:
Statement I : Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface
Statement II : Acceleration due to earth's gravity is same at a height '$h$' and depth ' $d$ ' from earth's surface, if $h = d$.
In the light of above statements, Choose the most appropriate answer form the options given below

A metallic rod of length ' $L$ ' is rotated with an angular speed of ' $\omega$ ' normal to a uniform magnetic field ' $B$ ' about an axis passing through one end of rod as shown in figure. The induced emf will be :

A mass $m$ attached to free end of a spring executes SHM with a period of $1 \,s$ If the mass is increased by $3\, kg$ the period of oscillation increases by one second, the value of mass $m$ is ______$kg.$

The energy released per fission of the nucleus of $^{240}\text{X}$ is $200 \, \text{MeV}$. The energy released if all the atoms in $120 \, \text{g}$ of pure $^{240}\text{X}$ undergo fission is _____ $10^{25} \, \text{MeV}$. (Given $N_A = 6 \times 10^{23}$)

If a copper wire is stretched to increase its length by $20 \%$ The percentage increase in resistance of the wire is _______$\%$.

A body of mass $1 \, \text{kg}$ begins to move under the action of a time-dependent force \[ \vec{F} = (t \, \hat{i} + 3t^2 \, \hat{j}) \, \text{N}, \] where $\hat{i}$ and $\hat{j}$ are unit vectors along $x$ and $y$ axes. The power developed by the above force, at the time $t = 2 \, \text{s}$, will be _____ W.

A uniform solid cylinder with radius $R$ and length $L$ has a moment of inertia $I_1$ about the axis of the cylinder. A concentric solid cylinder of radius $R' = \frac{R}{2}$ and length $L' = \frac{L}{2}$ is carved out of the original cylinder. If $I_2$ is the moment of inertia of the carved-out portion, then $\frac{I_1}{I_2} =$
(Both $I_1$ and $I_2$ are about the axis of the cylinder.)

A spherical ball of radius $1 \, \text{mm}$ and density $10.5 \, \text{g/cc}$ is dropped in glycerine of coefficient of viscosity $9.8 \, \text{poise}$ and density $1.5 \, \text{g/cc}$. The viscous force on the ball when it attains constant velocity is $3696 \times 10^{-x} \, \text{N}$. The value of $x$ is:
(Given, $g = 9.8 \, \text{m/s}^2$ and $\pi = \frac{22}{7}$)

Three identical resistors with resistance $R =12\, \Omega$ and two identical inductors with self inductance $L$ $=5\, mH$ are connected to an ideal battery with emf of $12\, V$as shown in figure. The current through the battery long after the switch has been closed will be ______A.

A solid cylinder of radius R and length L have moment of inertia I₁ and a second solid cylinder of radius R₂ and length L₂ cut from it have moment of inertia I₂. Find 11/I₂.

A body of mass 200 g is tied to a spring of spring constant 12.5 N/m, while the other end of the spring is fixed at point $ O $. If the body moves about $ O $ in a circular path on a smooth horizontal surface with constant angular speed 5 rad/s, then the ratio of extension in the spring to its natural length will be:

A cell of emf 90 V is connected across a series combination of two resistors, each of 100 $ \Omega $ resistance. A voltmeter of resistance 400 $ \Omega $ is used to measure the potential difference across each resistor. The reading of the voltmeter will be:

The logic gate equivalent to the given circuit diagram is :

In an Isothermal change, the change in pressure and volume of a gas can be represented for three different temperature $T3 > T2 > T1$ as :

An electron with energy $01\, keV$ moves at right angle to the earth's magnetic field of $1 \times 10^{-4} Wbm ^{-2}$ The frequency of revolution of the electron will be (Take mass of electron $=90 \times 10^{-31} kg$ )

An object is taken to a height above the surface of earth at a distance $\frac{5}{4} R$ from the centre of the earth Where radius of earth, $R =6400 km$ The percentage decrease in the weight of the object will be

In which condition EMF will be induced in loop.
Situation-S₁: A loop is moving with uniform velocity in a uniform magnetic field perpendicular
to its plane.
Situation-S₂: A loop is moving with non-uniform velocity in a uniform magnetic field
perpendicular to its plane.
Situation-S₃: A loop is rotating about its diameter in a uniform magnetic field.
Situation-S₄: Area of loop is changing in a uniform magnetic field.

The electric current in a circular coil of 2 turns produces a magnetic induction $B _1$ at its centre The coil is unwound and is rewound into a circular coil of 5 turns and the same current produces a magnetic induction $B _2$ at its centre The ratio of $\frac{ B _2}{ B _1}$ is :

The work function for two metals are 9eV and 4.5eV. Find the approx. difference between their threshold wavelength. (use hc = 1240 eV - nm)

A ball of mass $200\, g$ rests on a vertical post of height $20\, m$ A bullet of mass $10 \,g$, travelling in horizontal direction, hits the centre of the ball After collision both travels independently The ball hits the ground at a distance $30 \,m$ and the bullet at a distance of $120 \,m$ from the foot of the postThe value of initial velocity of the bullet will be (if $g=10\, m / s ^2$ ) :

The charge flowing in a conductor changes with time as $Q(t)=\alpha t-\beta t ^2+\gamma^3$ Where $\alpha, \beta$ and $\gamma$ are constants Minimum value of current is :

The length of a seconds pendulum at a height h=2R from earth surface will be :
(Given : R= Radius of earth and acceleration due to gravity at the surface of earth g=π²ms⁻²)

For a free body diagram shown in the figure, the four forces are applied in the ' $x$ ' and ' $y$ ' directions What additional force must be applied and at what angle with positive $x$-axis so that the net acceleration of body is zero?