No. of questions - 40
Time - 30 min
1.
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?
2.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
3.
The characteristic not associated with Planck’s theory is
4.
X-rays do not show the phenomenon of :
5.
As electron moves away from the nucleus, its KE:
6.
The nucleus of an atom contains
7.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
9.
Which is not deflected by magnetic field:
10.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
11.
A quanta will have more energy, if :
12.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
13.
No two electrons can have the same values of …. quantum numbers.
14.
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?
15.
When light is directed at the metal surface, the emitted electrons:
16.
Photoelectric effect was discovered by :
18.
Zeeman effect refers to the
19.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
20.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
21.
Increase in the frequency of the incident radiations increases the:
22.
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
23.
Bohr′s model violates the rules of classical physics because it assumes that:
24.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
25.
What is the ration of mass of an electron to the mass of a proton?
26.
Energy of photon of visible light is
27.
Quantum theory was postulated by:
28.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
29.
Cathode-ray tube is used in:
30.
Potassium ion is isoelectronic with the atom of:
33.
The number of vacant orbitals of element with atomic number 14 is:
34.
Particle nature of electron was experimentally demonstrated by
35.
Wave nature of electrons was demonstrated by
36.
The electron possesses wave properties was shown experimentally by:
37.
Positive rays or canal rays are:
38.
The nature of canal rays depends on:
39.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
