A monochromatic visible light consists of

O2 molecules consists of two oxygen atoms. In the molecule, Nuclear force between the nuclei of two atoms.
(A) is not important because Nuclear forces are short ranged
(B) is as important as electrostatic force for binding the two atoms
(C) cancels the repulsive electrostatic force between the nuclei
(D) not important because oxygen nucleus have equal no. of neutrons and protons
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A difference of 2.21 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?

A boat is moving due east in a region where the Earth's magnetic field is \( 5.0 \times 10^{-5} \text{ NA}^{-1}\text{m}^{-1} \) due north and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is \( 10.5 \text{ m s}^{-1} \), find the induced e.m.f. in the aerial.

An electron in a hydrogen atom is in the third excited state. It returns to the ground state by emitting photons. How many different photon wavelengths are possible ?

In the context of the Photoelectric effect, identify the statements which support quantum nature of light.
(A) The electric charge of photoelectrons is quantized
(B) The maximum kinetic energy of photoelectrons depends on the frequency of the incident light, but is independent of its intensity
(C) The photoelectric emission is an instantaneous process without any apparent time lag, even when the incident radiation is made exceedingly dim
(D) There is a minimum frequency of light below which no photoelectrons are emitted
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Which of the following statements are correct?
A. Number of photoelectrons emitted per second is directly proportional to the intensity of incident radiation
B. Cut off potential is the minimum negative potential given to the plate for which photocurrent becomes maximum
C. For a given frequency of the incident radiation, the stopping potential is independent of its intensity
D. Even for the exceedingly dim incident radiation apparent time lag is \( \sim 10^{-9} \) s or less
E. Photons are electrically neutral and are not deflected by electric and magnetic fields
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Which of the following causes electric conduction in a semiconductor?

Which one of the following ligands forms a chelate?

Which of the following physical quantities have the same value for electron and photons of same wavelength?

Which of the following compounds will give Fehling's solution test?
(A) \(CH _3 CHO\)
(B) \(C _6 H _5 CHO\)
(C) \(CH _3 CH _2 CHO\)
(D) HCHO

Match List I with List II

LIST I	LIST II
A. \(\frac{d}{dx} [x^{-3}(5+3x)]\)	I. \(-\frac{2}{(x+1)^2} + \frac{3}{(x-2)^2}\)
B. \(\frac{d}{dx} [(x-a)(x-b)]\)	II. \(-\frac{15}{x^2} - \frac{6}{x^3}\)
C. \(\frac{d}{dx} [\frac{2}{x+1} - \frac{3}{x-2}]\)	III. \(-\frac{2}{(x-1)^2}\)
D. \(\frac{d}{dx} [\frac{x+1}{x-1}]\)	IV. \(2x - a - b\)

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Elements of group-15, 16 and 17 form compounds with hydrogen with general formula MH3, \(H 2 M\) and HX (called hydrogen halides). Stability of these hydrides, along with M-H bond strength and basic nature decreases down the group. Boiling point of these hydrides mainly depends on the strength of their inter molecular forces.
Decreasing order of boiling point of group 15 hydrides is:
A. \(NH _3\)
B. \(PH _3\)
C. \(AsH _3\)
D. \(SbH _3\)
E. \(BiH _3\)
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