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JEE Mains | PYQ

A ball is thrown up vertically with a certain velocity so that, it reaches a maximum height \( h \). Find the ratio of the times in which it is at height \( \dfrac{h}{3} \) while going up and coming down respectively.

If \( t=\sqrt{x}+4 \), then \( \left(\dfrac{dx}{dt}\right)_{t=4} \) is:

A smooth circular groove has a smooth vertical wall as shown in figure. A block of mass \( m \) moves against the wall with a speed \( v \). Which of the following curve represents the correct relation between the normal reaction on the block by the wall \( (N) \) and speed of the block \( (v) \)?

A ball is projected with kinetic energy \( E \), at an angle of \( 60^\circ \) to the horizontal. The kinetic energy of this ball at the highest point of its flight will become:

Two bodies of mass \( 1\,\text{kg} \) and \( 3\,\text{kg} \) have position vectors \( \hat{i}+2\hat{j}+\hat{k} \) and \( -3\hat{i}-2\hat{j}+\hat{k} \) respectively. The magnitude of position vector of centre of mass of this system will be similar to the magnitude of vector:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason (R): Because the angle of contact between the oil/grease and water is obtuse.
In the light of the above statements, choose the correct answer from the option given below:

If the length of a wire is made double and radius is halved of its respective values. Then, the Young’s modulus of the material of the wire will:

The time period of oscillation of a simple pendulum of length \( L \) suspended from the roof of a vehicle, which moves without friction down an inclined plane of inclination \( \alpha \), is given by:

A spherically symmetric charge distribution is considered with charge density varying as is the distance from the centre O (as shown in figure). The electric field at point P will be:

Given below are two statements.
Statement I: Electric potential is constant within and at the surface of each conductor.
Statement II: Electric field just outside a charged conductor is perpendicular to the surface of the conductor at every point.
In the light of the above statements, choose the most appropriate answer from the options given below.

Two metallic wires of identical dimensions are connected in series. If \( \sigma_1 \) and \( \sigma_2 \) are the conductivities of the these wires respectively, the effective conductivity of the combination is:

An alternating emf \( E = 440\sin 100\pi t \) is applied to a circuit containing an inductance of \( \dfrac{\sqrt{2}}{\pi} \, \text{H} \). If an a.c. ammeter is connected in the circuit, its reading will be:

A coil of inductance \( 1 \, \text{H} \) and resistance \( 100\Omega \) is connected to a battery of \( 6 \, \text{V} \). Determine approximately:
(a) The time elapsed before the current acquires half of its steady–state value
(b) The energy stored in the magnetic field associated with the coil at an instant \( 15 \, \text{ms} \) after the circuit is switched on (Given \( \ln 2 = 0.693 \), \( e^{-3/2} = 0.25 \))

Match List-I with List-II

Choose the correct answer from the options given below:

The kinetic energy of emitted electron is \( E \) when the light incident on the metal has wavelength \( \lambda \). To double the kinetic energy, the incident light must have wavelength:

Find the ratio of energies of photons produced due to transition of an electron of hydrogen atom from its (i) second permitted energy level to the first level, and (ii) the highest permitted energy level to the first permitted level.

Find the modulation index of an AM wave having \( 8 \, \text{V} \) variation where maximum amplitude of the AM wave is \( 9 \, \text{V} \).

A travelling microscope has \( 20 \) divisions per \( \text{cm} \) on the main scale while its vernier scale has total \( 50 \) divisions and \( 25 \) vernier scale divisions are equal to \( 24 \) main scale divisions, what is the least count of the travelling microscope?

In experiment to find out the diameter of wire using screw gauge, the following observations were noted:

(a) Screw moves \( 0.5 \, \text{mm} \) on main scale in one complete rotation
(b) Total divisions on circular scale \( = 50 \)
(c) Main scale reading is \( 2.5 \, \text{mm} \)
(d) \( 45^{\text{th}} \) division of circular scale is in the pitch line
(e) Instrument has \( 0.03 \, \text{mm} \) negative error
Then the diameter of wire is

An object projected in the air with initial velocity \( u \) at an angle \( \theta \). The projectile motion is such that the horizontal range \( R \), is maximum. Another object is projected in the air with a horizontal range half of the range of first object. The initial velocity remains same in both the case. The value of the angle of projection, at which the second object is projected, will be _________ degree.

If the acceleration due to gravity experienced by a point mass at a height \( h \) above the surface of earth is same as that of the acceleration due to gravity at a depth \( \alpha h \) (\( h \ll R_e \)) from the earth surface. The value of \( \alpha \) will be _________. (use \( R_e = 6400 \, \text{km} \))

The pressure \( P_{1} \) and density \( d_{1} \) of diatomic gas \( \left( \gamma = \dfrac{7}{5} \right) \) changes suddenly to \( P_{2} \; ( > P_{1} ) \) and \( d_{2} \) respectively during an adiabatic process. The temperature of the gas increases and becomes ________ times of its initial temperature. (given \( \dfrac{d_{2}}{d_{1}} = 32 \))

One mole of a monoatomic gas is mixed with three moles of a diatomic gas. The molecular specific heat of mixture at constant volume is \( \dfrac{\alpha^2}{4} R \, \text{J/mol K} \); then the value of \( \alpha \) will be __________ (Assume that the given diatomic gas has no vibrational mode).

The current \( I \) flowing through the given circuit will be __________ \( \text{A} \).

A closely wounded circular coil of radius \( 5 \, \text{cm} \) produces a magnetic field of \( 37.68 \times 10^{-4} \, \text{T} \) at its center. The current through the coil is __________ \( \text{A} \).
[Given, number of turns in the coil is \( 100 \) and \( \pi = 3.14 \) ]

Two light beams of intensities \( 4I \) and \( 9I \) interfere on a screen. The phase difference between these beams on the screen at point \( A \) is zero and at point \( B \) is \( \pi \). The difference of resultant intensities, at the point \( A \) and \( B \), will be __________ \( I \).

A wire of length \( 314 \, \text{cm} \) carrying current of \( 14 \text{A} \) is bent to form a circle. The magnetic moment of the coil is __________ \( \text{A}\!\!-\!\!\text{m}^2 \). [Given \( \pi = 3.14 \) ]

The X-Y plane be taken as the boundary between two transparent media \( M_1 \) and \( M_2 \). \( M_1 \) in \( Z \ge 0 \) has a refractive index of \( \sqrt{2} \) and \( M_2 \) with \( Z < 0 \) has a refractive index of \( \sqrt{3} \). A ray of light travelling in \( M_1 \) along the direction given by the vector \( \vec{P}=4\sqrt{3}\,\hat{i}-3\sqrt{3}\,\hat{j}-5\hat{k} \), is incident on the plane of separation. The value of difference between the angle of incident in \( M_1 \) and the angle of refraction in \( M_2 \) will be __________ degree.

If the potential barrier across a p-n junction is \( 0.6 \, \text{V} \). Then the electric field intensity, in the depletion region having the width of \( 6 \times 10^{-6} \, \text{m} \), will be __________ \( \times 10^{5} \, \text{N/C} \)