No. of questions - 40
Time - 30 min
1.
Photoelectric effect was discovered by :
2.
Quantum theory was postulated by:
3.
The electron possesses wave properties was shown experimentally by:
5.
The nucleus of an atom contains
6.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
7.
Particle nature of electron was experimentally demonstrated by
8.
A quanta will have more energy, if :
9.
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?
10.
Increase in the frequency of the incident radiations increases the:
11.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
12.
The nature of canal rays depends on:
13.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
14.
Potassium ion is isoelectronic with the atom of:
15.
As electron moves away from the nucleus, its KE:
16.
What is the ration of mass of an electron to the mass of a proton?
17.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
18.
Zeeman effect refers to the
19.
Bohr′s model violates the rules of classical physics because it assumes that:
20.
Positive rays or canal rays are:
21.
Wave nature of electrons was demonstrated by
22.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
24.
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?
25.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
27.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
28.
Energy of photon of visible light is
29.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
30.
Cathode-ray tube is used in:
31.
The characteristic not associated with Planck’s theory is
32.
When light is directed at the metal surface, the emitted electrons:
33.
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
34.
No two electrons can have the same values of …. quantum numbers.
35.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
36.
Which is not deflected by magnetic field:
39.
X-rays do not show the phenomenon of :
40.
The number of vacant orbitals of element with atomic number 14 is:
