Practice/Question bank/JEE Main

JEE Main practice questions

NTA-style Physics, Chemistry and Maths MCQs with solutions. 2,688 questions in the bank.

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  1. 1A 60 pF capacitor is fully charged by a 20V supply. It is then disconnected from the supply and isconnected to another uncharged 60 pF…Physics· Capacitance· Moderate· figure
  2. 2In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found thatbalancing length is $\mathcal{l}$ = 25 cm.…Physics· Current Electricity· Moderate· figure
  3. 3The charge appearing on outer surface of external plates when S_1 and S_2 are open and external plates are uncharged.Physics· Capacitance· Easy· figure
  4. 4The charge that will flow to earth when only switch S1 is closed and right most plate is uncharged isPhysics· Capacitance· Moderate
  5. 5The emf of cell E_2 isPhysics· Current Electricity· Moderate
  6. 6The internal resistance of cell E2Physics· Current Electricity· Moderate· figure
  7. 7A fiber sheet with relative permittivity 5 is inserted between two parallel metal plates 0.25 cm apart. Apotential difference of 2500 v is…Physics· Capacitance· Moderate· figure
  8. 8The current i in the network isPhysics· Current Electricity· Moderate· figure
  9. 9In the given circuit diagram, a wire is joining points B and D. The current in this wire isPhysics· Current Electricity· Moderate· figure
  10. 10The magnetic field is increasing at a constant rate$\alpha$ through a circular loop of radius aandthe axis of magnetic field coincides with…Physics· EMI· Moderate· figure
  11. 11If the magnetic field in a plane electromagnetic wave is given by $\overset{\rightarrow}{B} = 3 \times 10^{- 8}sin\left( 1.6 \times 10^{3}x…Physics· EM wave· Moderate
  12. 12The dimensions of$\frac{B^{2}}{2\mu_{0}}$, where B is magnetic field and $\mu_{0}$ is the magnetic permeability of vacuum, isPhysics· Magnetism· Easy
  13. 13The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, coercivity and saturation,…Physics· Magnetism· Moderate· figure
  14. 14The magnitude of magnetic field at O (centre of the circular part) of the current carrying coil as shownisPhysics· Magnetic effect of current· Moderate· figure
  15. 15In an electromagnetic wave, the electric field oscillates sinusoidal with amplitude 48 Vm^-1, the RMSvalue of oscillating magnetic field…Physics· EM wave· Moderate
  16. 16The coercivity of a small magnet where the ferromagnet gets demagnetized is 3 × 10^3 Am^-1. The current required to be passed in a solenoid…Physics· Magnetism· Moderate
  17. 17Two concentric rings of radius r and R are in same plane such that R >> r. Current Ι is maintained in thering of radius r. Flux associated…Physics· EMI· Moderate· figure
  18. 18An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/lengthand carries a current I. The…Physics· Magnetic effect of current· Moderate· figure
  19. 19Magnitude of Magnetic field at point due to given current distribution isPhysics· Magnetic effect of current· Moderate· figure
  20. 20Two long conductors are arranged as shown above to form overlapping cylinders, each of radius r,whose centers are separated by a distance…Physics· Magnetic effect of current· Tough· figure
  21. 21What would be the magnetic moment of given current distributionPhysics· Magnetism· Easy· figure
  22. 22A conducting circular loop of copper is placed as shown in figure. Cross section area of part abc is A and part adc is A/3 then magnetic…Physics· Magnetic effect of current· Moderate· figure
  23. 23A 100 turns closely wound current carrying coilof radius 10 cm is placed in a vertical plane. Thecoil carries a current of 3.2 A and free…Physics· Magnetism· Tough
  24. 24At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by theclosed loop shown in the figure. If…Physics· EMI· Moderate· figure
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