JEE Main questions
34495 published questions with worked solutions.
- An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the...
- Arrange the following electromagnetic radiations per quantum in the order of increasing energy : A : Blue light B : Yellow light...
- An observer looks at a distant tree of height 10 m with a telescope of magnifying power of 20. To the observer the tree appears :
- The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel...
- Radiation of wavelength λ, is incident on a photocell. The fastest emitted electron has speed v. If the wavelength is changed to...
- A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of...
- A pipe open at both ends has a fundamental frequency f in air. The pipe is dipped vertically in water so that half of it is in...
- A galvanometer having a coil resistance of 100 Ω gives a full scale deflection, when a current of 1 mA is passed through it. The...
- In an experiment for determination of refractive index of glass of a prism by i – δ, plot, it was found that a ray incident at...
- The species in which the N atom is in a state of sp hybridization is :
- The heats of combustion of carbon and carbon monoxide are –393.5 and –283.5 kJ mol^ -1 , respectively. The heat of formation (in...
- 18 g glucose ( C_6H_ 12 O_6 ) is added to 178.2 g water. The vapour pressure of water (in torr) for this aqueous solution is:
- The equilibrium constant at 298 K for a reaction A + B C + D is 100. If the initial concentration of all the four species were 1...
- Galvanization is applying a coating of :
- Decomposition of H_2O_2 follows a first order reaction. In fifty minutes the concentration of H_2O_2 decreases from 0.5 to 0.125...
- For a linear plot of log (x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ?...Not in JEE Main or NEET syllabus
- Which of the following atoms has the highest first ionization energy ?
- Which one of the following ores is best concentrated by froth floatation method ?Not in JEE Main or NEET syllabus
- Which one of the following statements about water is FALSE ?Not in JEE Main or NEET syllabus
- The main oxides formed on combustion of Li, Na and K in excess of air are, respectively :Not in JEE Main or NEET syllabus