JEE Main questions
34495 published questions with worked solutions.
- A stationary observer receives sound from two identical tuning forks, one of which approaches and the other one recedes with the...
- Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other engine to produce work) between...
- The activity of a radioactive sample falls from 700 s ^ -1 to 500 s ^ -1 in 30 minutes . Its half life is close to -
- The electric field of a plane electromagnetic wave is given by – E =E_0 i + j 2 (kz+ t) At t = 0, a positively charged particle...
- An elevator in a building can carry a maximum of 10 person, with the average mass of each person being 68 kg. The mass of the...
- A planar loop of wire rotates in a uniform magnetic field. Initially, at t = 0, the plane of the loop is perpendicular to the...
- An electron (of mass m) and a photon have the same energy E in the range of a few eV. The ratio of the de-Broglie wavelength...
- An ideal fluid flows (laminar flow) through a pipe of non-uniform diameter. The maximum and minimum diameters of the pipes are...
- The dimension of B^2 2 _0 , where B is magnetic field and _0 is the magnetic permeability of vaccum, is :
- A thin lens made of glass (refractive index = 1.5) of focal length f = 16 cm is immersed in a liquid of refractive index 1.42. If...
- A mass of 10 kg is suspended by a rope of length 4m, from the ceiling, A force F is applied horizontally at the mid-point of the...
- Under an adiabatic process, the volume of an ideal gas gets doubled. Consequently the mean collision time between the gas...
- A 60 pF capacitor is fully charged by a 20 V supply. It is then disconnected from the supply and is connected to another...
- The sum of two forces P and Q is R such that | R |=| P |. The angle (in degrees) that the resultant of 2 P and Q will make with Q...
- M grams of steam at 100° C is mixed with 200 g of ice at its melting point in a thermally insulated container. If it produces...
- Among the statements(a)-(d), the incorrect ones are : (a) Octahedral Co(III) complexes with strong field ligands have very high...
- Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are...
- A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of...
- In the following reactions, products (A) and (B), respectively, are : NaOH + Cl_2 (A) + side products (hot and conc.) Ca(OH)_2 +...
- The ammonia ( NH_3 ) released on quantitative reaction of 0.6 g urea ( NH_2CONH_2 ) with sodium hydroxide (NaOH) can be...