MCQ
When npn transistor is used as an amplifier:
- AElectrons move from collector to base.
- BHoles move from emitter to base.
- CElectrons move from base to collector.
- DHoles move from base to emitter.
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In which frequency range, space waves are normally propagated
|
(a) HF |
(b) VHF |
(c) UHF |
(d) SHF |
The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to
| (a) 13.6 eV | (b) 3.4 eV | (c) 1.5 eV | (d) 0.85 eV |
$\text{v}=\frac{\text{v}_1+\text{v}_2}{2}$
$\text{v}=\sqrt{\text{v}_1\text{v}_2}$
$\frac{2}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
$\frac{1}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance
|
(a) Length = 50 cm, diameter = 0.5 mm |
(b) Length = 100 cm, diameter = 1 mm |
|
(c) Length = 200 cm, diameter = 2 mm |
(d) Length = 300 cm, diameter = 3 mm |
The phase difference between incident wave and reflected wave is 180° when light ray
|
(a) Enters into glass from air |
(b) Enters into air from glass |
|
(c) Enters into glass from diamond |
(d) Enters into water from glass |