No. of questions - 40
Time - 30 min
1.
Increase in the frequency of the incident radiations increases the:
2.
When light is directed at the metal surface, the emitted electrons:
3.
Bohr′s model violates the rules of classical physics because it assumes that:
4.
Positive rays or canal rays are:
5.
Particle nature of electron was experimentally demonstrated by
6.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
7.
The nature of canal rays depends on:
9.
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
10.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
11.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
12.
As electron moves away from the nucleus, its KE:
13.
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?
14.
A quanta will have more energy, if :
15.
The characteristic not associated with Planck’s theory is
16.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
17.
Energy of photon of visible light is
19.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
20.
The number of vacant orbitals of element with atomic number 14 is:
21.
Cathode-ray tube is used in:
23.
The nucleus of an atom contains
24.
X-rays do not show the phenomenon of :
25.
Which is not deflected by magnetic field:
27.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
28.
The electron possesses wave properties was shown experimentally by:
29.
What is the ration of mass of an electron to the mass of a proton?
30.
Quantum theory was postulated by:
31.
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?
32.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
33.
Photoelectric effect was discovered by :
34.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
35.
No two electrons can have the same values of …. quantum numbers.
36.
Zeeman effect refers to the
37.
Potassium ion is isoelectronic with the atom of:
38.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
39.
Wave nature of electrons was demonstrated by
