List of top Physics Questions asked in JEE Main

A block takes \(t\) time to slide down a plane inclined at \(45^\circ\) to the horizontal. If the surface is made smooth (frictionless), the block takes time \( \frac{t}{2} \) to slide down the plane. The coefficient of friction between the block and the inclined plane is \( \left(\frac{\alpha}{100}\right) \). The value of \( \alpha \) is _____.

The de Broglie wavelength for an electron accelerated through the potential difference of \(V_1\) volt is \( \lambda_1 \). When the potential difference is changed to \(V_2\) volt, the associated de Broglie wavelength is increased by \(50%\). If \( \left(\frac{V_1}{V_2}\right)=\frac{9}{\alpha} \), then the value of \( \alpha \) is _____.

A moving coil galvanometer when shunted with \(2\,\Omega\) resistance gives a full scale deflection for a current of \(500\,\text{mA}\). When a resistance of \(470\,\Omega\) is connected in series it gives a full scale deflection for \(10\,\text{V}\) potential applied on it. The value of resistance of galvanometer coil is _____ \(\Omega\).

Two cells of emfs \(1\,\text{V}\) and \(2\,\text{V}\) and internal resistances \(2\,\Omega\) and \(1\,\Omega\) respectively connected in parallel, gave a current of \(1\,\text{A}\) through an external resistance. If the polarity of one cell is reversed, the current through the external resistance will be \( \frac{\alpha}{5} \) A. The value of \( \alpha \) is _____.

A concave mirror of focal length \(10\,\text{cm}\) forms an image which is double the size of object when the object is placed at two different positions. The distance between the two positions of the object is _____ cm.

Refer to the logic circuit given below. For two inputs \((A=1,B=1)\) and \((A=0,B=1)\), output \(Y\) will be _____.

The velocity at which \(6\,\text{kg}\) mass (shown in figure) strikes the ground when it is released from a height of \(6\,\text{m}\) above the ground is _____ m/s. Assume pulley is massless and string is light and inextensible. (Take \(g=10\,\text{m/s}^2\)).

In a Young double slit experiment, the wavelength of incident light is \(6000\,\text{\AA}\), the separation between slits \(S_1\) and \(S_2\) is \(5\,\text{cm}\) and the distance between slits plane and screen is \(50\,\text{cm}\), as shown in the figure. If the resultant intensity at \(P\) is equal to the intensity due to individual slits, the path difference between interfering waves is _____ \AA.

Angle of minimum deviation is equal to half of the angle of prism in an equilateral prism. The refractive index of the prism is _____.

A spring stretches by \(2\,\text{mm}\) when it is loaded with a mass of \(200\,\text{g}\). From equilibrium position the mass is further pulled down by \(2\,\text{mm}\) and released. The frequency associated with the system and the maximum energy in the spring are _____ Hz and _____ J, respectively. (Take \(g=10\,\text{m/s}^2\)).

The electric potential as a function of \(x,y\) is given by \(V=5(x^2-y^2)\,\text{V}\). The electric field at the point \((2,3)\) m is _____ V/m.

A current of \(30\,\text{A}\) each flows in opposite directions in two conducting wires, placed parallel to each other at a distance of \(8\,\text{cm}\). The magnetic field at the mid point between the two wires is _____ \(\mu\text{T}\). \(\left(\frac{\mu_0}{4\pi}=10^{-7}\,\text{}^2\right)\)

A square loop of side \(2\,\text{cm}\) is placed in a time varying magnetic field with magnitude \(B=0.4\sin(300t)\) Tesla. The normal to the plane of loop makes an angle \(60^\circ\) with the field. The maximum induced emf produced in the loop is _____ mV.

A sphere of capacitance \(100\,\text{pF}\) is charged to a potential of \(100\,\text{V}\). Another identical uncharged metal sphere is brought in contact with the charged sphere, then the change in the total energy stored on these spheres, when they touch is \(\alpha \times 10^{-7}\,\text{J}\). The value of \(\alpha\) is _____. (combined capacitance of spheres is \(200\,\text{pF}\)).

The energy released if hydrogen atoms are combined to form \(^{4}_{2}\text{He}\) is _____ MeV. (Take binding energies per nucleon of \(^{2}_{1}\text{H}\) and \(^{4}_{2}\text{He}\) as \(1.1\,\text{MeV}\) and \(7.2\,\text{MeV}\), respectively).

A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas is filled in both (left and right) the compartments at same \(P,V,T\). Heating is started from left side until pressure changes to \( \frac{27P}{8} \). If initial volume of each compartment was \(9\) litres then the final volume in right-hand side compartment is _____ litres. (for this ideal gas \(C_P/C_V=1.5\)).

For an electromagnetic wave propagating through vacuum, \( \vec{k},\vec{E}\) and \( \omega \) represent propagation vector, electric field and angular frequency respectively. The magnetic field associated with this wave is represented by :

Two identical bodies \(A\) and \(B\) of equal masses have initial velocities \(\vec v_1 = 4\hat{i}\,\text{m/s}\) and \(\vec v_2 = 4\hat{j}\,\text{m/s}\) respectively. The body \(A\) has acceleration \(\vec a_1 = 6\hat{i} + 6\hat{j}\,\text{m/s}^2\) while the acceleration of body \(B\) is zero. The centre of mass of the two bodies moves in ______ path.

Figure represents the extension (\(\Delta l\)) of a wire of length \(l\), suspended from the ceiling of the room at one end and with a load \(W\) connected to the other end. If the cross-sectional area of the wire is \(10^{-5}\,\text{m}^2\) then the Young’s modulus of the wire is _____ N/m\(^2\).

A cylindrical vessel of \(40\,\text{cm}\) radius is completely filled with water and its capacity is \(528\,\text{dm}^3\) (\(\text{dm}=\text{decimetre}\)). The vessel is placed on a solid block of same height as vessel. If a small hole is made at \(70\,\text{cm}\) below the top of water level, then the horizontal range of water falling on the ground in the beginning is ______ cm.

If \(2\) mole of an ideal monoatomic gas at temperature \(T\) is mixed with \(6\) mole of another ideal monoatomic gas at temperature \(2T\) then the temperature of mixture is :

The percentage error in the calculated volume of a sphere, if there is \(2%\) error in its diameter measurement, is _____.

Match List-I with List-II.

Choose the correct answer.