O Level Online Exam Test MCQ (Multiple Choice Questions) PDF Download

If the car tires are hot, the pressure of gas molecules in them would be

1. high
2. low
3. same as before heating
4. may be high or low

Volume of gas is

1. directly proportional to temperature
2. inversely proportional to temperature
3. directly proportional to friction
4. inversely proportional to heat

If air at a pressure of 1 MPa is compressed such that the new volume of the air is one quarter of its initial volume, then the new pressure of the air is

1. 1 M Pa
2. 0.25 M Pa
3. 2 M Pa
4. 4 M Pa

In an aquarium, air bubble at the bottom has a volume = 0.5 mm³. What would be the size of the bubble at the top if the height of the water level is = 1 m. (density of water = 1000 kg ⁄ m³, atmospheric pressure = 1 × 10⁵ Pa, gravitational acceleration = 10 m s^-1²)

1. 0.5 mm³
2. 0.55 mm³
3. 0.6 mm³
4. 0.65 mm³

As the volume is inversely proportional to pressure, we can conclude that

1. p₁V₂ = p₂V₁
2. p₂/V₂ = p₁V₁
3. p₁V₁ = p₂V₂
4. p₁V₁ = p₂/V₂