JEE Main questions
34495 published questions with worked solutions.
- To mop-clean a floor, a cleaning machine presses a circular mop of radius R vertically down with a total force F and rotates it...
- A solid metal cube of edge length 2 cm is moving in a positive y-direction at a constant speed of 6 m/s. There is a uniform...
- In a Young's double slit experiment with slit separation 0.1 mm, one observes a bright fringe at angle 1 40 rad by using light of...
- The density of a material in SI units is 128 kg m^ -3 . In certain units in which the unit of length is 25 cm and the unit of...
- Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts...
- A uniform metallic wire has a resistance of 18 Ω and is bent into an equilateral triangle. Then, the resistance between any two...
- A plano convex lens of refractive index _1 and focal length f_1 is kept in contact with another plano concave lens of refractive...
- In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a...
- A homogeneous solid cylindrical roller of radius R and mass M is pulled on a cricket pitch by a horizontal force F. Assuming...
- A string of length 1 m and mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration...
- A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current which can be passed...
- If the magnetic field of a plane electromagnetic wave is given by (the speed of light = 3 10^ 8 m/s) B = 100 10^ -6 [2 2 10^ 15...
- A charge Q is distributed over three concentric spherical shells of radii a, b, c (a < b < c) such that their surface charge...
- A piece of wood of mass 0.03 kg is dropped from the top of a 100 m height building. At the same time, a bullet of mass 0.02 kg is...
- The type of hybridisation and number of lone pair(s) of electrons of Xe in XeOF_4, respectively, are:
- Which of the following is not an example of heterogenous catalytic reaction?Not in JEE Main or NEET syllabus
- The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are:Not in JEE Main or NEET syllabus
- A process has ΔH = 200 J mol^ -1 and ΔS = 40 JK^ -1 mol^ -1 . Out of the values given below, choose the minimum temperature above...
- A mixture of 100 m mol of Ca(OH)_2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The...
- Hall-Héroult's process is given by:Not in JEE Main or NEET syllabus