Physics Pressure in Fluids and Atmospheric Pressure Exercise4a
Please Select
Q1 Define the term thrust. State its S.I. unit.
Solution :
Q2 What is meant by pressure? State its S.I. unit.
Solution :
Q3 (a) What physical quantity is measured in bar?
(b) How is the unit bar related to the S.I. unit pascal?
Solution :
Q4 Define one pascal (Pa), the S.I. unit of pressure.
Solution :
Q5 State whether thrust is a scalar or vector?
Solution :
Q6 State whether pressure is a scalar or vector?
Solution :
Q7 Differentiate between thrust and pressure.
Solution :
Q8 How does the pressure exerted by a thrust depend on the area of surface on which it acts? Explain with a suitable example.
Solution :
Q9 Why is the tip of an allpin made sharp?
Solution :
Q10 Explain the following:
(a) It is easier to cut with a sharp knife than with a blunt one.
(b) Sleepers are laid below the rails
Solution :
Q11 What is a fluid?
Solution :
Q12 What do you mean by the term fluid pressure?
Solution :
Q13 How does the pressure exerted by a solid and a fluid differ?
Solution :
Q14 Describe a simple experiment to demonstrate that a liquid enclosed in a vessel exerts pressure in all directions
Solution :
Q15 State three factors on which the pressure at a point in a liquid depends.
Solution :
Q16 Write an expression for the pressure at a point inside a liquid. Explain the meaning of the symbols used.
Solution :
Q17 Deduce an expression for the pressure at a depth inside a liquid.
Solution :
,
Q18 How does the pressure at a certain depth in sea water differ from that at the same depth in river water? Explain your answer.
Solution :
Q19 Pressure at free surface of a water lake is P1, while at a point at depth h below its free surface is P2. (a) How are P1 and P2 related? (b) Which is more P1 or P2?
Solution :
Q20 Explain why a gas bubble released at the bottom of a lake grow quess in size as it rises to the surface of lake.
Solution :
Q21 A dam has broader walls at the bottom than at the top. Explain.
Solution :
Q22 Why do sea divers need special protective suit?
Solution :
Q23 State the laws of liquid pressure.
Solution :
Q24 A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just below the free surface of water. State and explain your observation.
Solution :
Q25 How does the liquid pressure on a diver change if:
(i) The diver moves to the greater depth, and
(ii) The diver moves horizontally?
Solution :
Q26 State Pascal’s law of transmission of pressure.
Solution :
Q27 Name two applications of Pascal’s law.
Solution :
Q28 Explain the principle of a hydraulic machine. Name two devices which work on this principle.
Solution :
Q29 Name and state the principle on which a hydraulic press works. Write one use of the hydraulic press.
Solution :
Q30 The diagram in figure shows a device which makes use of the principle of transmission of pressure.
(i) Name the parts labelled by the letters X and Y.
(ii) Describe what happens to the valves A and B and to the quantity of water in the two cylinders when the lever arm is moved down.
(iii) Give reasons for what happens to the valves A and B in part (ii).
(iv) What happens when the release valve is opened?
(v) What happens to the valve B in cylinder P when the lever arm is moved up?
(vi) Give a reason for your answer in part (v)
(vii) State one use of the above device.
Solution :
,
Q31 Draw a simple diagram of a hydraulic jack and explain its working.
Solution :
,
Q32 Explain the working of a hydraulic brake with a simple labelled diagram.
Solution :
,
Q33 Complete the following sentences:
(a) Pressure at a depth h in a liquid of density ρ is ___________
(b) Pressure is ________ in all directions about a point in a liquid
(c) Pressure at all points at the same depth is _________
(d) Pressure at a point inside a liquid is __________ to its depth.
(e) Pressure of a liquid at a given depth is _______ to the density of liquid.
Solution :
Multiple Choice type Questions :
Q1 The S.I. unit of pressure is:
(a) N cm-2
(b) Pa
(c) N
(d) N m2
Solution :
Q2 The pressure inside a liquid of density ρ at a depth h is:
(a) h ρ g
(b) h/ ρ g
(c) h ρ/ g
(d) h ρ
Solution :
Q3 The pressure P1 at a certain depth in river water and P2 at the same depth in sea water are related as:
(a) P1 > P2
(b) P1 = P2
(c) P1 < P2
(d) P1 - P2 = atmospheric pressure
Solution :
Q4 The pressure P1 at the top of a dam and P2 at a depth h from the top inside water (density ρ) are related as:
(a) P1 > P2
(b) P1 = P2
(c) P1 - P2 = h ρ g
(d) P2 – P1 = h ρ g
Solution :
Contact Us
