Physics 1st Paper CQ-Sylhet Board-2023

1. In above figure, at a certain displacement of the pendulum Kinetic energy $=$ Potential energy.

2. Two students in a trip to an island, observed formation of air bubble in two adjacent ponds. Air pressure $=10^{5} \mathrm{~Pa}$.

3. In a hostel, the dimension of water reservoir is 1.6m x 1.4m x 1.2m. Two third of the reservoir is filled with water. To lift the water at a height of 50m, a water pump of power 5.5kW and efficiency 80% is used. After lifting half of the water, the pump stops due to loadshedding. The rest of the water is lifted after the loadshedding.

4. For laboratory purpose two wire P & Q are specially made. From experimental result the following data on P & Q was obtained.

5. In an experiment, air temperature in Khagrachori was $28^{\circ} \mathrm{C}$ and dew point $7.8^{\circ} \mathrm{C}$. Due to a sudden cold wave, temperature at that place is reduced to $14^{\circ} \mathrm{C}$.

The saturated vapor pressure at $7^{\circ} \mathrm{C}, 8^{\circ} \mathrm{C}$ and $28^{\circ} \mathrm{C}$ is 7.51 , 8.05 and $28.35 \mathrm{~mm}$ of $\mathrm{Hg}$ column pressure.