An electron jumps from the 4th orbit to the 2nd orbit of hydrogen atom. Given the Rydberg’s constant R = 107 m-1. The frequency in Hz of the emitted radiation is (c = 3x108 m/s)
A van is moving with a speed of 108 km/hr on a level road where the coefficient of friction between the tyres and the road is 0.5. For the safe driving of the van, the minimum radius of curvature of the road shall be (Acceleration due to gravity, g=10 m/s2)
Calculate final volume of a gas when pressure of 60 mL gas is increased from 1 to 1.5 atm, keeping temperature constant
The maximum speed of a particle in S.H.M. is V. The average speed is
What is the pH of the solution containing 1.342 x 10–3 M H+ ions? (log 1.342 =0.1277)
Which among the following is not a characteristic of alcohols?
Two point charges q1 and q2 are ‘l’ distance apart. If one of the charges is doubled and distance between them is halved, the magnitude of force becomes n times, where n is
Identify the compound that undergoes SN1 mechanism most fastly
A 4 kg mass and a 1 kg mass are moving with equal energies. The ratio of the magnitude of their linear momenta is
A liquid drop having surface energy ‘E’ is spread into 216 droplets of the same size. The final surface energy of the droplets is __.
In an adiabatic expansion of a gas initial and final temperatures are T1 and T2 respectively then the change in internal energy of the gas is [R = gas constant, γ = adiabatic ratio]
A galvanometer of resistance G has voltage range Vg. Resistance required to convert it to read voltage up to V is
Which from following equations is correct for relation between standard cell potential and equilibrium constant?
Ammonia and oxygen react at high temperature as in reaction, 4HN3(g) + 5O2(g) → 4NO(g) + 6H2O(g) If rate of formation of NO is 3.6 x 10–3 mol L–1 .sec–1 . Calculate the rate of formation of water.
What is the product formed when CH3–CH=CH2 is treated with B2H6 followed by the action of H2O2?
A magnetizing field of 1000 A/m produces a magnetic flux of 2.4 x 10-5 Wb in an iron bar of cross-sectional area 0.3 cm2.The magnetic permeability of the iron bar in SI unit is
Which from following polymers is obtained using
What is the co-ordination number of hcp crystal lattice?
A metal wire of density ‘ρ’ floats on water surface horizontally. If it is NOT to sink in water, then maximum radius of wire is (T = surface tension of water, g = gravitational acceleration)
Under isothermal conditions a gas expands from 0.2 dm3 to 0.8 dm3 against a constant pressure of 2 bar at 300 K. Find the work done by the gas.(1 dm3 bar = 100 J)
Which among the following carboxylic acids is found in Lemon?
Identify anionic complex from following
In hydrogen atom, radius of the smallest orbit of the electron is a0, the radius of the third orbit is
A hollow cylinder has a charge q coulomb within it. It ϕ is the electric flux associated with the curved surface B, the flux linked with the plane surface A will be