Physics 1st Paper CQ-Chittagong Board-2022

প্রশ্ন ·সময় ১ ঘণ্টা ৪০ মিনিট

1. A large vehicle of mass 1800 kg 1800 \mathrm{~kg} is moving at a speed of 72kmh1 72 \mathrm{kmh}^{-1} hit a small vehicle of mass 1000 kg 1000 \mathrm{~kg} parked in front from behind. After the collision, two vehicles moved together and stopped after 60 m 60 \mathrm{~m} . Mahi who was standing on the side of the road as a student of science, observed the accident and said that it an inelastic collision.

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

2. On a certain day the temperature of upper surface of water of Kaptai lake is 28C 28^{\circ} \mathrm{C} . The atmospheric pressure and dew point are 105pa 10^{5} \mathrm{pa} and 10.5C 10.5^{\circ} \mathrm{C} respectively. The temperature of bottom of the lake and the average density of water are 7C 7^{\circ} \mathrm{C} and 1000kgm3 1000 \mathrm{kgm}^{-3} respectively. The radius of and air bubble becomes three times when it comes from the bottom to the surface of the lake at that day. [The saturated vapour pressures at 10C,11C 10^{\circ} \mathrm{C}, 11{ }^{\circ} \mathrm{C} and 28C 28^{\circ} \mathrm{C} are respectively 9.2,9.9 9.2,9.9 and 28.5 mm 28.5 \mathrm{~mm} Hg] \mathrm{Hg}]

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

3. A car of 1800 kg 1800 \mathrm{~kg} takes 30sec 30 \mathrm{sec} to reach the point B B from the point A A using the maximum power of engine along the inclined plane of the below figure with the driver of mass 60 kg[g=9.8 ms2] \mathrm{kg} \cdot\left[\mathrm{g}=9.8 \mathrm{~ms}^{-2}\right]

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

4. A current of velocity 6kmh1 6 \mathrm{kmh}^{-1} is flowing in a river of 500 m \mathrm{m} width. Mahi and Nidhi decided to swim across the river to complete in the competition. Mahi started swimming at the angle of α \alpha with current with velocity 10kmh1 10 \mathrm{kmh}^{-1} and Nidhi started swimming vertically with the current with velocity 9 kmh1 \mathrm{kmh}^{-1} .

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

5. An artificial satellite was placed at 26000 km 26000 \mathrm{~km} above from the earth's surface of Dhaka. Radius of the earth is 6400 km 6400 \mathrm{~km} and mass is 6×1024 kg 6 \times 10^{24} \mathrm{~kg} .

ব্যাখ্যা আনলক করতে চর্চা প্রিমিয়াম এ আপগ্রেড করো

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