No. of questions - 40
Time - 30 min
1.
Potassium ion is isoelectronic with the atom of:
2.
Photoelectric effect was discovered by :
3.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
4.
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?
5.
Increase in the frequency of the incident radiations increases the:
6.
A quanta will have more energy, if :
7.
Energy of photon of visible light is
8.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
10.
Zeeman effect refers to the
11.
Wave nature of electrons was demonstrated by
12.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
13.
As the number of orbit increase from the nucleus, the difference between the adjacent energy levels:
14.
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
15.
Bohr′s model violates the rules of classical physics because it assumes that:
17.
The nucleus of an atom contains
18.
The nature of canal rays depends on:
19.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state is
20.
The number of vacant orbitals of element with atomic number 14 is:
21.
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?
22.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
23.
X-rays do not show the phenomenon of :
24.
No two electrons can have the same values of …. quantum numbers.
25.
What is the ration of mass of an electron to the mass of a proton?
26.
Which is not deflected by magnetic field:
27.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
28.
Positive rays or canal rays are:
29.
The electron possesses wave properties was shown experimentally by:
30.
The characteristic not associated with Planck’s theory is
33.
As electron moves away from the nucleus, its KE:
34.
Particle nature of electron was experimentally demonstrated by
35.
Quantum theory was postulated by:
36.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
37.
Cathode-ray tube is used in:
38.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
40.
When light is directed at the metal surface, the emitted electrons:
