No. of questions - 40
Time - 30 min
1.
Cathode-ray tube is used in:
3.
The principal quantum number of H-atom orbital, if the electron energy is −3.4 eV, will be
4.
Photoelectric effect was discovered by :
5.
When the value of azimuthal quantum number is 3, magnetic quantum number can have values:
6.
Bohr′s model violates the rules of classical physics because it assumes that:
7.
Increase in the frequency of the incident radiations increases the:
8.
Positive rays or canal rays are:
9.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
10.
As electron moves away from the nucleus, its KE:
11.
The maximum sum of the number of neutrons and proton is an isotope of hydrogen is :
12.
Energy of H-atom in the ground state is -13.6 eV, hence energy in the second excited state 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.
What is the ration of mass of an electron to the mass of a proton?
16.
Quantum theory was postulated by:
18.
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?
19.
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
20.
A hydrogen atom in its ground state absorbs a photon. The maximum energy of such a photon is:
22.
Which is not deflected by magnetic field:
24.
Particle nature of electron was experimentally demonstrated by
26.
A quanta will have more energy, if :
27.
The nucleus of an atom contains
28.
Potassium ion is isoelectronic with the atom of:
29.
The characteristic not associated with Planck’s theory is
30.
The number of vacant orbitals of element with atomic number 14 is:
31.
No two electrons can have the same values of …. quantum numbers.
32.
The uncertainty principle and the concept of wave nature of matter was proposed by … and … respectively
33.
Zeeman effect refers to the
34.
Energy of photon of visible light is
35.
When light is directed at the metal surface, the emitted electrons:
36.
The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:
37.
Wave nature of electrons was demonstrated by
38.
The nature of canal rays depends on:
39.
X-rays do not show the phenomenon of :
40.
The electron possesses wave properties was shown experimentally by:
