No. of questions - 40
Time - 30 min
1.
What is the ration of mass of an electron to the mass of a proton?
2.
The characteristic not associated with Planck’s theory is
3.
Positive rays or canal rays are:
4.
The nucleus of an atom contains
5.
A quanta will have more energy, if :
6.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
7.
X-rays do not show the phenomenon of :
8.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
9.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
10.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
11.
Zeeman effect refers to the
12.
Increase in the frequency of the incident radiations increases the:
13.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
15.
Quantum theory was postulated by:
16.
Particle nature of electron was experimentally demonstrated by
17.
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.
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?
19.
As electron moves away from the nucleus, its KE:
20.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
21.
Which is not deflected by magnetic field:
22.
Cathode-ray tube is used in:
23.
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
24.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
25.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
26.
No two electrons can have the same values of …. quantum numbers.
28.
Energy of photon of visible light is
30.
The nature of canal rays depends on:
31.
The number of vacant orbitals of element with atomic number 14 is:
32.
Photoelectric effect was discovered by :
34.
The electron possesses wave properties was shown experimentally by:
35.
When light is directed at the metal surface, the emitted electrons:
37.
Bohr′s model violates the rules of classical physics because it assumes that:
38.
Potassium ion is isoelectronic with the atom of:
39.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
40.
Wave nature of electrons was demonstrated by
