MCQ
How can the brightness of the pattern on the screen or cathode ray tube be changed?
- ABy changing the negative potential on grid.
- BBy changing the positive potential on grid.
- CWe can't increase the brightness
- DNone of the above
✓
Answer
- By changing the negative potential on grid.
Explanation:
By changing the negative potential of the grid, we can control the number of electrons per unit time or the current in the cathode ray tube which changes the brightness.
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
What is the atomic mass (u) of chlorine?
The ratio of de-Broglie wavelengths of molecules of hydrogen and helium which are at temperature 27oC and 127oC respectively is
|
(a) |
(b) |
(c) |
(d) 1 |
When an impurity is doped into semiconductor, the conductivity of the semiconductor:
Some charge is being given to a conductor. Then its potential:
The plate characteristic curve of a diode in space charge limited region is as shown in the figure. The slope of curve at point P is 5.0 mA/V. The static plate resistance of diode will be
| (a) 111.1W | (b) 222.2W | (c) 333.3W | (d) 444.4W |
If a source is transmitting electromagnetic wave of frequency 8.2 
Hz, then wavelength of the electromagnetic waves transmitted from the source will be
|
(a) 36.6 m |
(b) 40.5 m |
(c) 42.3 m |
(d) 50.9 m |
The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be
|
(a) 3 |
(b) 4 |
(c) 5 |
(d) 6 |
Which of the following would you prefer to use while reading small letters found in a dictionary?
As one considers orbits with higher values of n in a hydrogen atom, the electric potential energy of the atom?
Two wires A and B are made of same material. The wore A has a length l and diameter r while the wire B has a length 2l and diameter $\frac{\text{r}}{2}$. If the two wires are stretched by the same force, the elongation in A divided by the elongation in 8 is:
→-
$\frac{1}{8}$
-
$\frac{1}{4}$
-
$4$
-
$8$