List of top Physics Questions asked in JEE Main

The binding energy per nucleon of $^{209} \text{Bi}$ is _______ MeV. \[ \text{Take } m(^{209} \text{Bi}) = 208.98038 \, \text{u}, \, m_p = 1.007825 \, \text{u}, \, m_n = 1.008665 \, \text{u}, \, 1 \, \text{u} = 931 \, \text{MeV}/c^2. \]

A circular current loop of radius $ R $ is placed inside square loop of side length $ L $ (where $ L \gg R $) such that they are co-planar and their centers coincide. The permeability of free space is $ \mu_0 $. The mutual inductance between the circular loop and square loop is _______.}

The figure given below shows an LCR series circuit with two switches $ S_1 $ and $ S_2 $. When switch $ S_1 $ is closed keeping $ S_2 $ open, the phase difference $ \phi $ between the current and source voltage is 30° and phase difference is 60° when $ S_2 $ is closed keeping $ S_1 $ open. The value of $ (3L_1 - L_2) $ is _______ H.}

Two point charges $ 8 \, \mu C $ and $ -2 \, \mu C $ are located at $ x = 2 \, \text{cm} $ and $ x = 4 \, \text{cm} $, respectively on the x-axis. The ratio of electric flux due to these charges through two spheres of radii 3 cm and 5 cm with their centers at the origin is _______.

Two metal plates (A, B) are kept horizontally with separation of $ \frac{12}{\pi} $ cm, with plate A on the top.} An atomizer jet sprays oil (density $ 1.5 \, \text{g/cm}^3 $) droplets of radius 1 mm horizontally. All oil droplets carry a charge 5 nC. The potentials $ V_A $ and $ V_B $ are required on plates A and B respectively in order to ensure the droplets do not descend. The values of $ V_A $ and $ V_B $ are _______. (Neglect the air resistance to the droplets and take $ g = 10 \, \text{m/s}^2 $)}

Two resistors of 200 $ \Omega $ and 400 $ \Omega $ are connected in series with a battery of 100 V. A bulb rated at 200 W, 100 V 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, $ B = 2 \times 10^{-7} \hat{j} $ T is associated with this wave. The value of the corresponding electric field $ E $ at this point is _______ V/m.}

If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg/m³ at a rate of 0.5 cm/s, then the coefficient of viscosity of the liquid is _______ Poise.

A mixture of carbon dioxide and oxygen has volume 8310 cm³, temperature 300 K, pressure 100 kPa and mass 13.2 g. The number of moles of carbon dioxide and oxygen gases in the mixture respectively are _______.

The surface tension of a soap bubble is 0.03 N/m. The work done in increasing the diameter of bubble from 2 cm to 6 cm is $ \alpha \times 10^{-4} $ J. The value of $ \alpha $ is _______. (Take $ \pi = 3.14 $)}

In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are 100 divisions in circular scale and pitch of screw gauge is 0.1 mm. When diameter of a sphere is measured, the reading of main scale is 5 mm and 50th division of circular scale coincides with the reference line of main scale. The diameter of sphere is _______ mm.}

If a body of mass 1 kg falls on the earth from infinity, it attains velocity $ v $ and kinetic energy $ k $ on reaching the surface of the earth. The values of $ v $ and $ k $ respectively are _______.