Physics 2nd Paper MCQ-Cumilla Board-2023

1. The half life of Radium is 1600 years. After 6400 years what fraction of that will be left?

2. If the pressure of a diatomic gas is increased by $5 \%$ in an adiabatic process, by what percentage will the volume of the gas decrease? $(\gamma=1.4)$

3. Which of the following substance has a negative temperature coefficient of resistance?

4. The atomic number and the mass number of an atom remain unchanged when it emits-

5. Which of the following is applicable for charging a solid and a hollow sphere having same radius at the same potential?