Question
Cathode rays consist of
|
(a) Photons |
(b) Electrons |
(c) Protons |
(d) α -particles |
✓
Answer
(b) Electrons
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Figure (a) shows two capacitors connected in series and joined to a battery. The graph in figure (b) shows the variation in potential as one moves from left to right on the branch containing the capacitors, if
|
(a) |
|
(b) |
|
(c) |
|
(d) The information is not sufficient to decide the relation between |
A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are
|
(a) A, Z |
(b) A + 1, Z |
(c) A, Z + 1 |
(d) A – 4, Z - 2 |
With increase in frequency of an A.C. supply, the inductive reactance.
The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be
|
(a) 2.5/5000 eV |
(b) |
(c) 2.5 × 5000 eV |
(d) |
In an hydrogen atom, the electron revolves around the nucleus in an orbit of radius 0.53 
. Then the electrical potential produced by the nucleus at the position of the electron is
|
(a) – 13.6 V |
(b) – 27.2 V |
(c) 27.2 V |
(d) 13.6 V |
A polariser is used to
|
(a) Reduce intensity of light |
(b) Produce polarised light |
|
(c) Increase intensity of light |
(d) Produce unpolarised light |
Dispersion can take place for
|
(a) Transverse waves only but not for longitudinal waves |
|
(b) Longitudinal waves only but not for transverse waves |
|
(c) Both transverse and longitudinal waves |
|
(d) Neither transverse nor longitudinal waves |
Let V and E be the gravitational potential and gravitational field at a distance r from the centre of a uniform spherical shell. Consider the following two statements:
- The plot of V against r is discontinuous.
- The plot of E against r is discontinuous.
- Both A and B are correct.
- A is correct but B is wrong.
- B is correct but A is wrong.
- Both A and B are wrong.
On rubbing, when one body gets positively charged and other negatively charged, the electrons transferred from positively charged body to negatively charged body are:
Statement A: With an increase in the frequency of AC supply inductive reactance increases.
Statement B: With an increase in the frequency of AC supply capacitive reactance increase.
Statement B: With an increase in the frequency of AC supply capacitive reactance increase.