No. of questions - 40
Time - 30 min
1.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
2.
Positive rays or canal rays are:
3.
Wave nature of electrons was demonstrated by
4.
Potassium ion is isoelectronic with the atom of:
5.
The electron possesses wave properties was shown experimentally by:
6.
X-rays do not show the phenomenon of :
7.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
8.
Quantum theory was postulated by:
9.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
10.
Increase in the frequency of the incident radiations increases the:
11.
What is the ration of mass of an electron to the mass of a proton?
12.
Cathode-ray tube is used in:
13.
The nucleus of an atom contains
14.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
16.
Particle nature of electron was experimentally demonstrated by
17.
When light is directed at the metal surface, the emitted electrons:
19.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
20.
The nature of canal rays depends on:
21.
The characteristic not associated with Planck’s theory is
22.
Energy of photon of visible light is
24.
The number of vacant orbitals of element with atomic number 14 is:
25.
Zeeman effect refers to the
26.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
27.
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?
28.
A quanta will have more energy, if :
29.
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
30.
Which is not deflected by magnetic field:
31.
No two electrons can have the same values of …. quantum numbers.
32.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
33.
As electron moves away from the nucleus, its KE:
34.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
35.
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?
36.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
37.
Photoelectric effect was discovered by :
39.
Bohr′s model violates the rules of classical physics because it assumes that:
