No. of questions - 40
Time - 30 min
1.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
2.
The nucleus of an atom contains
4.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
5.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
6.
Bohr′s model violates the rules of classical physics because it assumes that:
7.
Potassium ion is isoelectronic with the atom of:
8.
Positive rays or canal rays are:
9.
When light is directed at the metal surface, the emitted electrons:
10.
The electron possesses wave properties was shown experimentally by:
11.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
12.
The characteristic not associated with Planck’s theory is
13.
As electron moves away from the nucleus, its KE:
16.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
17.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
18.
Particle nature of electron was experimentally demonstrated by
19.
Energy of photon of visible light is
20.
Wave nature of electrons was demonstrated by
21.
The nature of canal rays depends on:
22.
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?
23.
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?
24.
What is the ration of mass of an electron to the mass of a proton?
25.
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
26.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
27.
X-rays do not show the phenomenon of :
28.
Zeeman effect refers to the
30.
Quantum theory was postulated by:
32.
A quanta will have more energy, if :
33.
Photoelectric effect was discovered by :
34.
The number of vacant orbitals of element with atomic number 14 is:
35.
Cathode-ray tube is used in:
36.
No two electrons can have the same values of …. quantum numbers.
37.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
38.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
39.
Increase in the frequency of the incident radiations increases the:
40.
Which is not deflected by magnetic field:
