No. of questions - 40
Time - 30 min
1.
No two electrons can have the same values of …. quantum numbers.
2.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
3.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
4.
Positive rays or canal rays are:
5.
Potassium ion is isoelectronic with the atom of:
6.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
7.
A quanta will have more energy, if :
9.
The number of vacant orbitals of element with atomic number 14 is:
10.
Bohr′s model violates the rules of classical physics because it assumes that:
11.
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?
12.
Increase in the frequency of the incident radiations increases the:
13.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
14.
When light is directed at the metal surface, the emitted electrons:
15.
Wave nature of electrons was demonstrated by
17.
As electron moves away from the nucleus, its KE:
18.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
19.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
20.
What is the ration of mass of an electron to the mass of a proton?
21.
Energy of photon of visible light is
23.
Particle nature of electron was experimentally demonstrated by
25.
Cathode-ray tube is used in:
26.
Photoelectric effect was discovered by :
27.
Quantum theory was postulated by:
28.
Zeeman effect refers to the
29.
The characteristic not associated with Planck’s theory is
30.
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?
31.
The nature of canal rays depends on:
32.
The electron possesses wave properties was shown experimentally by:
33.
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
34.
Which is not deflected by magnetic field:
35.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
36.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
37.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
38.
X-rays do not show the phenomenon of :
39.
The nucleus of an atom contains
