No. of questions - 40
Time - 30 min
1.
Wave nature of electrons was demonstrated by
2.
A gas absorbs photon of 355 nm and emits at two wavelengths. If one of the emission is at 680 nm, the other is at
3.
Increase in the frequency of the incident radiations increases the:
4.
Cathode-ray tube is used in:
5.
No two electrons can have the same values of …. quantum numbers.
6.
The electron possesses wave properties was shown experimentally by:
7.
Energy of photon of visible light is
8.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
9.
As electron moves away from the nucleus, its KE:
10.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
11.
The nucleus of an atom contains
12.
The nature of canal rays depends on:
14.
The number of vacant orbitals of element with atomic number 14 is:
15.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
16.
An electron jumps from an outer orbit to an inner orbit with an energy difference of 3.0eV. What will be the wavelength of the line emitted?
18.
Zeeman effect refers to the
19.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
20.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
21.
In Bohr’s series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbit in an atom of hydrogen?
22.
A quanta will have more energy, if :
25.
Bohr′s model violates the rules of classical physics because it assumes that:
26.
Potassium ion is isoelectronic with the atom of:
27.
Positive rays or canal rays are:
28.
Photoelectric effect was discovered by :
30.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
31.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
32.
When light is directed at the metal surface, the emitted electrons:
33.
Which is not deflected by magnetic field:
34.
Quantum theory was postulated by:
35.
Particle nature of electron was experimentally demonstrated by
36.
The characteristic not associated with Planck’s theory is
37.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
38.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
39.
What is the ration of mass of an electron to the mass of a proton?
40.
X-rays do not show the phenomenon of :
