Practice/Question bank/JEE Main

JEE Main practice questions

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

1. 1For a system of two as shown in the figure (both are at origin and perpendicular toeach other along x and y axes respectively) (P_1 and…Physics· Electrostatics· Tough· figure
2. 2In the show circuit diagram all capacitors are initially uncharged and cells are ideal. If C_1 = 1 $\mu F$,C_2 = 2 $\mu F$ and potential of…Physics· Electrostatics· Tough· figure
3. 3A 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
4. 4Four identical plates (equally spaced) and a battery are connected as shown. If the capacitancebetween two consecutive plates is C then…Physics· Electrostatics· Tough· figure
5. 5A $1\ µF$ capacitor is connected in the circuit shown below. The e.m.f. of the cell is 3 volts and internalresistance is 0.5 ohms. The…Physics· Electrostatics· Moderate· figure
6. 6The circuit shown below is working as a 8V dc regulated voltage source. When 12V is used as input,the power dissipated (in mW) in each…Physics· Electronic devices· Moderate· figure
7. 7In the figure, potential difference (in V) between A and B is 2n. Find n: fp=kPhysics· Electronic devices· Moderate· figure
8. 8For an amplitude modulated wave maximum and minimum amplitude are 10 V and 2 V respectively.Modulation index is n/3. Find n: 10 V rFkk 2 VPhysics· Communication system· Moderate
9. 9The current (in A) flowing through battery in the given circuit ifjiFkPhysics· Electronic devices· Moderate· figure
10. 10Consider a sphere of radius R which carries a uniform charge density $\rho$. If a sphere of radius $\frac{R}{2}$ is carved out of it, as…Physics· Electrostatics· Tough· figure
11. 11Two infinite planes each with uniform surface charge density $+ \sigma$ are kept in such a way that the anglebetween them is 30°. The…Physics· Electrostatics· Tough· figure
12. 12[IMAGE] A parallel plate capacitor has plates of area A separated by distance between them. It is filled with adielectric which has a…Physics· Capacitance· Tough· figure
13. 13A 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
14. 14In the given circuit, value of Y is: ifjiFkPhysics· Electronic devices· Moderate· figure
15. 15Which of the following gives a reversible operation ?Physics· Electronic devices· Moderate
16. 16Boolean relation at the output stage-Y for the following circuit isPhysics· Electronic devices· Moderate· figure
17. 17The activity of a radioactive sample falls from [IMAGE] to [IMAGE] in 30 minutes. Its half life is close toPhysics· Nuclear Physics· Moderate· figure
18. 18A capacitor is made of two square plates each of side making a very small angle $\alpha$ between them, as shown in figure. The capacitance…Physics· Capacitor· Tough· figure
19. 19[IMAGE] As shown in the figure, a battery of emf $\varepsilon$ is connected to an inductor L and resistance R in series. The switch is…Physics· Electromagnetic induction· Tough· figure
20. 20In the fig. shown a cart moves on a smooth horizontal surface due to an external constant force ofmagnitude F. The initial mass of the cart…Physics· Centre of Mass· Tough· figure
21. 21A force F= 4t acts on a particle of mass 1kg. If the particle starts from rest the work done by the force during the first 2 second will be…Physics· Work Power & Energy· Tough· figure
22. 22the frequency of the light used in an experiment on photoelectric effect. If the work function is $\frac{x}{42}$ (in eV) then value of x…Physics· Dual Nature of Matter· Moderate· figure
23. 23A solid sphere of mass m and radius r is gently placed on a conveyer belt moving with constant velocityV. If the coefficient of friction…Physics· Rotational motion· Tough· figure
24. 24A train of mass M is moving on a circular track of radius ' R ' with constant speed V. The length of thetrain is half of the perimeter of…Physics· System of particles· Moderate· figure