Practice questions
88551 published questions with worked solutions.
- A particle moving with kinetic energy E has de Broglie wavelength . If energy E is added to its energy, the wavelength become /2....
- The aperture diameter of a telescope is 5 m. The separation between the moon and the earth is 4 10^5 km. With light of wavelength...
- A vessel of depth 2h is half filled with a liquid of refractive index 2 2 and the upper half with another liquid of refractive...
- Three harmonic waves having equal frequency and same intensity I_0, have phase angles, 0, 4 and - 4 respectively. When they are...
- The electric fields of two plane electromagnetic plane waves in vacuum are given by E _1=E_0 j ( t-kx) and E _2=E_0 k ( t-ky) At...
- The distance x covered by a particle in one dimensional motion varies with time t as x^2 = at^2 + 2bt + c. If the acceleration of...
- A body of mass m = 10 kg is attached to one end of a wire of length 0.3 m. The maximum angular speed (in rad s ^ -1 ) with which...
- In a fluorescent lamp choke (a small transformer) 100 V of reverse voltage is produced with the choke current changes uniformly...
- If the magnetic moment of a dioxygen species is 1.73 B.M, it may be:
- [ Pd(F)(Cl)(Br)(I) ]^ 2- has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation...
- The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54, Ce = 58, Eu = 63)
- For following reactions A 700 K Product A [ catalyst ] 500 K Product it was found that the E_a is decreased by 30 kJ/mol in the...
- 'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:Not in JEE Main or NEET syllabus
- Complex X of composition Cr(H_2O)_6Cl_n has a spin only magnetic moment of 3.83 BM. It reacts with AgNO_3 and shows geometrical...
- The acidic, basic and amphoteric oxides, respectivley, are:
- The K_ sp for the following dissociation is 1.6 10^ -5 PbCl_ 2(s) Pb^ 2+ _ (aq) + 2Cl^-_ (aq) Which of the following choices is...
- A chemist has 4 samples of artificial sweetener A, B, C and D. To identify these samples, he performed certain experiments and...
- B has a smaller first ionization enthalpy than Be. Consider the following statements: (i) it is easier to remove 2p electron than...
- If enthalpy of atomisation for Br_ 2(l) is x kJ/mol and bond enthalpy for Br_2 is y kJ/mol, the relation between them:
- The molarity of HNO_3 in a sample which has density 1.4 g/mL and mass percentage of 63% is __________. (Molecular Weight of HNO_3...