MCQ
An $N-$ type and $P-$ type silicon can be obtained by doping pure silicon with
- AArsenic and Phosphorous
- BIndium and Aluminium
- ✓Phosphorous and Indium
- DAluminium and Boron
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Consider the following two statements:
$(I)$ Flux through a spherical surface enclosing the charge is $\phi=q_{\text {enclosed }} / \varepsilon_{0}$.
$(II)$ A charge placed inside uniformly charged shell will experience a force.
Which of the above statements are valid?
| લિસ્ટ$-I$ | લિસ્ટ$-II$ |
| $a$. Infrared waves | $i$. To treat muscular strain |
| $b$. Radio waves | $ii$. For broadcasting |
| $c$. $X-$rays | $iii$. To detect fracture of bones |
| $d$. Ultraviolet rays | $iv$. Absorbed by the ozone layer of the atmosphere |
$a$ $b$ $c$ $d$
$(A)$ Photoelectric effect $(B)$ Compton effect
$(C)$ Doppler's effect $(D)$ Field effect

