No. of questions - 40
Time - 30 min
1.
The electron possesses wave properties was shown experimentally by:
2.
The nucleus of an atom contains
3.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
4.
The nature of canal rays depends on:
5.
The characteristic not associated with Planck’s theory is
6.
When light is directed at the metal surface, the emitted electrons:
7.
Zeeman effect refers to the
8.
Quantum theory was postulated by:
9.
Which is not deflected by magnetic field:
10.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
11.
Energy of photon of visible light is
12.
Particle nature of electron was experimentally demonstrated by
13.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
14.
Wave nature of electrons was demonstrated by
15.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
16.
The number of vacant orbitals of element with atomic number 14 is:
17.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
18.
Bohr′s model violates the rules of classical physics because it assumes that:
19.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
21.
Photoelectric effect was discovered by :
22.
Increase in the frequency of the incident radiations increases the:
25.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
26.
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?
27.
Positive rays or canal rays are:
28.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
29.
A quanta will have more energy, if :
30.
Potassium ion is isoelectronic with the atom of:
31.
As electron moves away from the nucleus, its KE:
32.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
33.
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?
34.
Cathode-ray tube is used in:
35.
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
36.
X-rays do not show the phenomenon of :
37.
What is the ration of mass of an electron to the mass of a proton?
39.
No two electrons can have the same values of …. quantum numbers.
