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Chapter 6 Fluid Dynamics Physics 11th Class Punjab Short Questions

Question No. 1 - How an aeroplane is lifted up?

Answer No. 1 - The wing of the aeroplane is designed to deflect the air so that the streamlines are closer together above the wing than below it. Thus, air is travelling faster on the upper side of the wing than on the lower . As the result , the pressure will be lower at the top of the wing, and the wing will be forced upward.

Question No. 2 - What are conditions of an ideal fluid?

Answer No. 2 - For an ideal fluid, the conditions are:
1. The fluid is non-viscous.
2. The fluid is in-compressible.
3. The fluid motion is steady.

Question No. 3 - A person is standing near a fast moving train, is there any danger that he will fall towards it?

Answer No. 3 - According to Bernoulli's equation. Where the speed is high, pressure will be low. So the pressure between the person and train will be low as compared to the pressure of side way. So there is a danger that he may fall towards the train.

Question No. 4 - Explain what you understand by term Viscosity?

Answer No. 4 - The frictional effect between the layers of the flowing fluid is called viscosity. Viscosity measures, how much force is required to slide one layer of liquid over another layer.
Thick tar and honey have large coefficient of viscosity than water.

Question No. 5 - Why should Chimney be tall for its better working?

Answer No. 5 - A Chemistry works best when it is tall and exposed to air currents, which reduces the pressure at the top and force the upward flow of smoke.

Question No. 6 - Explain how the lift is produced in an aeroplane?

Answer No. 6 - Aeroplane wing is designed to deflect the air so that streamlines are closer
together above the wing than below it. Thus, air is travelling faster on the upper side of the wing then on the lower. The pressure will be the lower at the top of the wing, and the wing will be forced upward.

Question No. 7 - Describe the method of measuring human blood pressure.

Answer No. 7 - The blood pressure of a person is measured using a device called galvanometer.
A stethoscope detects the instant at which the external pressure becomes equal to the systolic pressure.At this point, the blood flow through the vessel with very high speed. As a result, the flow is initially turbulent
As the pressure drops, the external pressure eventually equals the diastolic pressure. The flow of the blood switches from turbulent to laminar, and gurgle in the stethoscope disappears. This is the signal to record the diastolic pressure.

Question No. 8 - Two boats moving parallel in the same direction are pulled toward each other.

Answer No. 8 - According to Bernoulli\'s equation, where the speed is high, pressure will be low.So the pressure between the two boats decreases as compared to the pressure of sideways. So the side way high pressure pushes the two boat towards each other.

Question No. 9 - Explain how the swing is produced in a fast moving cricket ball.

Answer No. 9 - When the cricket ball is thrown in such a way that it spins as well as moves forward, the velocity of the air on one side of the ball increases due to the spin and hence the pressure decrease. So the swing is produced in a fast moving cricket ball.

Question No. 10 - Describe any application of Bernoulli's equation.

Answer No. 10 - When the cricket ball is thrown in such a way that is spins as well as moves forward, the velocity of the air on one side of the ball increase due to the spin and hence the pressure decrease, So the swing is produced in a fast moving cricket ball.
And it is just in accordance with Bernoulli' equation.

Question No. 11 - Write few lines on blood flow.

Answer No. 11 - Blood is an in compressible fluid having density nearly equal to that of water. A high concentration of red blood cells increases its viscosity from three to five times. Blood vessels are not rigid. They stretched like rubber hose. There is tension in the walls of the blood vessels.

Question No. 12 - Considering Bernoulli's principle, explain the working of a carburetor of a motor car.

Answer No. 12 - The carburetor of a car engine uses a Venture duct to feed the correct mix of air and petrol to the cylinders. The air through the duct moves very fast, creating low pressure in the duct, which draws petrol vapour into the air stream and enters the cylinder of the engine, where combustion occurs.

Chapter 6 Fluid Dynamics Physics 11th Class Punjab Short Questions

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