Physics 2nd Paper MCQ-Barishal Board-2021

1. In adibatic process -

i. $P V^{r}=$ constant

ii. $\mathrm{TV}^{r}=$ constant

iii. $T^{2} \mathrm{P}^{1-r}=$ constant

Which one of the following is correct?

2. In Galilean transformation -

i. equations of Newtonian Mechanics remains unchanged

ii. the mathematical expression for electromagnetic theory is changed

iii. second postulates of special theory of relativity is violated

Which one is correct?

3. A heater of $220 \mathrm{~V}$ is $n \mathrm{~m}$ by $110 \mathrm{~V}$. What will be the amount of heat produced compared to the previous amount?

4. What is the input current in the above circuit?

5. In Carnot's engine $840 \mathrm{~J}$ of heat is absorbed from a source at $400 \mathrm{~K}$ and is released $630 \mathrm{~J}$ of heat in the sink.

What is the temperature of the sink?