12 questions
When blood pressure is measured, the cuff of the sphygmomanometer is wrapped round the upper arm and must be held at the level of the heart. Why?
Blood pressure depends on the level of the blood.
Blood pressure is normal when the cuff and heart are at the same level.
Blood is able to flow easily to the wrist.
The pressure of sea water at the bottom of the sea is 1.2 × 108 N m–2.
Determine the depth of the sea.
[Density of sea water = 1020 kg m–3]
1.18×104 m
1.18×105 m
1.18×106 m
1.18×109 m
A submarine has a surface area of 300 m2.
The density of sea water is 1050 kg m–3.
At what depth under the sea, will the additionalpressure on the submarine be 5 × 105 Pa?
[Take g = 10 N kg–1]
47.62 m
67.62 m
87.62 m
57.62 m
The figure below shows a reservoir on a hill. The reservoir supplies water to a water tank on a tall building.
Calculate the water pressure at X.
(Density of water = 1000 kg m–3)
1.4×109 Nm–2
1.4×102 Nm–2
1.4×105 Nm–2
1.4×108 Nm–2
A coin sinks to a depth of 5 m in a liquid of density 800 kg m–3. At what depth, in a different liquid of density 600 kg m–3, will the coin be subjected to the same pressure?
6.67 m
8.67 m
9.67 m
5.67 m
The figure shows a pond with two fish P and Q.
What is the correct relation of the water pressures on fish P and fish Q?
Water pressure on fish Q > Water pressure on fish P.
Water pressure on fish Q < Water pressure on fish P.
Water pressure on fish Q = Water pressure on fish P.