Physics 2nd Paper MCQ-Chittagong Board-2022

1. The number $(19 \mathrm{E})_{16}$ haxadecimal indicates what is the number in decimal?

2. What is not a polar dielectric substance of the below?

3. When a p-n junction is in reverse bis, if the applied voltage increases to certain voltage, the electric current in the $p-n$ junction suddenly increases very high. This voltage is called -

4. The characteristics of photoelectric effect is -

i. it is instantancous incident

ii. the kinetic energy of a photoelectron is proportional the frequency of the incident light

iii. the amount of the photoelectric current is inversely proportional to the intensity of the incident light

Which one is correct?

5. $\mathrm{X} \xrightarrow{\beta} \mathrm{Y} \xrightarrow[\text { Fig-2 }]{\alpha} \mathrm{Z} \xrightarrow{\gamma} \mathrm{M}$

[Where $\alpha, \beta$ and $\gamma$ are the emitted particles from $X, Y$ and $Z$ elements respectively. The mass number of the element $\mathrm{M}$ is 210 and its atomic number is 82.]

$X$ and $Y$ elements of the stem are -