Pressure and Density Quiz

Diagram 1 shows a glass filled with water. The pressure exerted on the base of the cup increases when more water is poured into the cup, more oil is poured into the cup, water is replaced by a denser liquid, the depth of the water in the cup increases.

• I and II only

• I and IV only

• II, III and IV only

• I, II, III and IV

Which of the following is the descending order for the density of objects P, Q, R and S?

• P > Q > R > S

• Q > R > S > P

• R > P > S > Q

• P > S > R > Q

Diagram 2 shows a water reservoir supplying water to a house. Given that the density of water is 1000 kg m-3. Calculate the pressure of the water supplied at point R, in Pa.

• 510120 Pa

• 519930 Pa

• 559170 Pa

• 618030 Pa

Diagram 3 shows a kid drinking a packet of milk. When he finished drinking, the empty packet crumbled. What causes this situation to happen?

• The atmospheric pressure > the pressure inside the drinking packet

• The atmospheric pressure < the pressure inside the drinking packet

• The atmospheric pressure = the pressure inside the drinking packet

Diagram 4 shows a manometer containing mercury of 13 600 kg m-3 connected to a source of gas. Given the atmospheric pressure is 76 cm Hg. What is the pressure of the gas supply?

• 16009.92 Pa

• 110735.28 Pa

• 117406.08 Pa

• 9339.12 Pa

Diagram 5 shows a simple hydraulic jack. The weight of a car is 2.0 x 10^7 N and the ratio between the surface areas of the master piston to the slave piston is 1 : 12. What is the force exerted on the master piston?

• 1.3 x 10^6 N

• 1.3 x 10^7 N

• 1.7 x 10^6 N

• 1.7 x 10^7 N

Diagram 6 shows a recreational balloon floating at a fixed height. The buoyant force acting on the balloon is not equal to

• the weight of the balloon

• the density of the balloon

• weight of air displaced by the balloon

Diagram 7 shows a boat with a weight of 1200 N floating on a water. Which of the following statements is not true?

• The buoyant force is equal to 1200 N

• The weight of the water displaced is 1200 N

• The volume of the boat is equal to the volume of the water displaced

• The density of the boat is not necessarily less than the density of the water

Diagram 8 shows a submarine travelling in the sea at a level of 20 m below the surface. Given the atmospheric pressure is 1.0 x 10^5 Pa and the density of seawater is 1200 kg m^-3. What is the pressure exerted on the submarine, in kPa?

• 24 kPa

• 140 kPa

• 235.44 kPa

• 335.44 kPa

Which of the following pairs of devices is classified correctly according to its physical principle?

• Ship, Hydraulic jack

• Aerofoil, Sprayer

• Hydraulic jack, Hydrometer

• Hydraulic Brake, Ship