No. of questions - 40
Time - 30 min
1.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
2.
Cathode-ray tube is used in:
3.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
4.
Particle nature of electron was experimentally demonstrated by
6.
Quantum theory was postulated by:
7.
The electron possesses wave properties was shown experimentally by:
8.
Positive rays or canal rays are:
9.
The number of vacant orbitals of element with atomic number 14 is:
10.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
11.
The characteristic not associated with Planck’s theory is
13.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
14.
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?
15.
Zeeman effect refers to the
16.
As electron moves away from the nucleus, its KE:
17.
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
18.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
19.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
20.
Increase in the frequency of the incident radiations increases the:
21.
Potassium ion is isoelectronic with the atom of:
22.
Bohr′s model violates the rules of classical physics because it assumes that:
23.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
25.
Which is not deflected by magnetic field:
26.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
27.
Energy of photon of visible light is
28.
A quanta will have more energy, if :
29.
X-rays do not show the phenomenon of :
30.
No two electrons can have the same values of …. quantum numbers.
31.
The nucleus of an atom contains
33.
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?
34.
Wave nature of electrons was demonstrated by
35.
What is the ration of mass of an electron to the mass of a proton?
36.
When light is directed at the metal surface, the emitted electrons:
38.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
39.
The nature of canal rays depends on:
40.
Photoelectric effect was discovered by :
