JEE Main questions
34495 published questions with worked solutions.
- A wooden block of mass 5kg rests on soft horizontal floor. When an iron cylinder of mass 25 kg is placed on the top of the block,...
- A simple pendulum doing small oscillations at a place R height above earth surface has time period of T_1 = 4s. T_2 would be it's...
- Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as 4.62 s,...
- An alternating voltage of amplitude 40 V and frequency 4 kHz is applied directly across the capacitor of 12 μF. The maximum...
- In Young's double slit experiment, carried out with light of wavelength 5000Å, the distance between the slits is 0.3 mm and the...
- A 2A current carrying straight metal wire of resistance 1Ω, resistivity 2 × 10^ -6 Ωm, area of cross –section 10 mm^2 and mass...
- The electric field between the two parallel plates of a capacitor of 1.5 μF capacitance drops to one third of its initial value...
- The density and breaking stress of a wire are 6 × 10^4 kg/m^3 and 1.2 × 10^8 N/m^2 respectively. The wire is suspended from a...
- A body moves on a frictionless plane starting from rest. If S_n is distance moved between t = n – 1 and t = n and S_ n-1 is...
- If three helium nuclei combine to form a carbon nucleus then the energy released in this reaction is ...... × 10^ -2 MeV. (Given...
- Three capacitors of capacitances 25 μF, 30 μF and 45 μF are connected in parallel to a supply of 100 V. Energy stored in the...
- The incorrect postulates of the Dalton's atomic theory are: (A) Atoms of different elements differ in mass. (B) Matter consists...
- The following reaction occurs in the Blast furnance where iron ore is reduced to iron metal: Fe_2O_3(s) + 3CO(g) ⇌ Fe(l) +...
- Given below are two statements: One is labeled as Assertion (A) and the other is labelled as Reason (R) Assertion (A): Enthalpy...
- The statement (s) that are correct about the species O^ 2- , F^-, Na^+ and Mg^ 2+ . (A) All are isoelectronic (B) All have the...
- For the compounds: (A) H_3C–CH_2–O–CH_2–CH_2–CH_3 (B) H_3C–CH_2–CH_2–CH_2–CH_3 (C) CH_3–CH_2–C(=O)–CH_2–CH_3 (D)...
- Given below are two statements: Statement I: In group 13, the stability of +1 oxidation state increases down the group. Statement...
- Number of σ and π bonds present in ethylene molecule is respectively:
- The reaction at cathode in the cells commonly used in clocks involves.
- Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co...