Practice questions
88551 published questions with worked solutions.
- The acceleration due to gravity on the earth's surface at the poles is g and angular velocity of the earth about the axis passing...
- A driver in a car, approaching a vertical wall notices that the frequency of his car horn, has changed from 440 Hz to 480 Hz,...
- In an adiabatic process, the density of a diatomic gas becomes 32 times its initial value. The final pressure of the gas is found...
- A radioactive nucleus decays by two different processes. The half life for the first process is 10 s and that for the second is...
- Two different wires having lengths L_1 and L_2, and respective temperature coefficient of linear expansion _1 and _2, are joined...
- The quantities x= 1 _0 _0 , y= E B and z= 1 CR are defined where C-capacitance, R-Resistance, -length, E-Electric field,...
- A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate dM dt =bv^2(t), where v(t)...
- The correct match between the entries in column I and column II are : List-I: (a) Microwave (b) Gamma rays (c) A.M. radio waves...
- The surface of a metal is illuminated alternately with photons of energies E_1 = 4eV and E_2 = 2.5 eV respectively. The ratio of...
- Nitrogen gas is at 300°C temperature. The temperature (in K) at which the rms speed of a H_2 molecule would be equal to the rms...
- A body of mass 2 kg is driven by an engine delivering a constant power 1 J/s. The body starts from rest and moves in a straight...
- A prism of angle A = 1° has a refractive index = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to...
- The correct statement about probability density (except at infinite distance from nucleus) is :
- The compound that has the largest H–M–H bond angle (M=N, O, S, C), is -
- Which one of the following polymers is not obtained by condensation polymerisation?Not in JEE Main or NEET syllabus
- Boron and silicon of very high purity can be obtained through :Not in JEE Main or NEET syllabus
- Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol ^ -1 and 4 kJ mol ^ -1 , respectively. The hydration enthalpy of...
- Reaction of ammonia with excess Cl_2 gives -
- The correct order of the ionic radii of O^ 2- , N^ 3- , F^- , Mg^ 2+ , Na^+ and Al^ 3+ is :
- Consider the complex ions, trans-[ Co(en)_2Cl_2 ]^+ (A) and cis-[ Co(en)_2Cl_2 ]^+ (B). The correct statement regarding them is :