Measuring atmospheric pressure

Question

Question 1: Four blocks each weighing 10N rest on a horizontal table. Which block applies the greatest pressure on the table?

Question 2: A nail is squeezed between finger and thumb. Which statement is correct?

(a) The force of the pin is larger on the finger than on the thumb.

(b) The force of the pin is larger on the thumb than on the finger.

(c) The pressure of the pin is larger on the finger than on the thumb.

(d) The pressure of the pin is larger on the thumb than on the finger.

Question 3: Same weight is applied on two wheels but one wheel is narrow and one is wide. Which statement is correct?

(a) The force on the narrow wheel is greater.

(b) The pressure on the narrow wheel is greater.

(c) The pressure on the wide wheel is greater.

(d) The force on the wide wheel is greater.

Question 4: The block shown below was placed on soil. The block will go in the soil:

(a) Deeper when its placed on side A

(b) Deeper when its placed on Side B

(c) To the same depth on both sides A and B

(d) None of the answers is correct

Question 5: All of the following are units of pressure except:

(a) Pascal (Pa)

(b) Newton per square meter (N/m2)

(C) Joules (J)

(d) Centimeters of mercury cmHg

Question 6: Which of the following is a unit of pressure?

(a) N

(b) bar

(c) psi

(d) b and c are correct

Question 7: The ______________ the area, the larger is the pressure applied

(a) Bigger

(b) Smaller

(c) Larger

(d) None of the answers

Question 8: 2 bar is equal to _______ m H₂O

(a) 152

(b) 20.44

(c) 2.068

(d) 206.8

Question 9:150 cm Hg = _____________ KPa

(a) 199.5

(b) 1995

(c) 1.995

(d) 19.95

Question 10: 512 psi = _______________ bars

(a) 3.4816

(b) 34.816

(c) 348.16

(d) 3481.6

Question 11: 6 psi = ______ KPa.

(a) 4.1334

(b) 413.34

(c) 41.334

(d) 4133.4

Question 12: 3 m H2O =___________ cm Hg

(a) 2.205

(b) 22.05

(c) 220.5

(d) 220.5

Question 13: Which of the following is a fluid?

(a) Water

(b) Sand

(c) Oxygen

(d) a and c are correct

Question 14: Which of the following is not a fluid?

(a) Crude oil

(b) Iron

(c) Oxygen

(d) Petrol

Question 15: At which point in the container is the static pressure greatest?

(a) A

(b) B

(c) C

(d) None of the answers is correct

Question 16: 4 beakers are filled with different liquids to the same height as shown in the picture below. Which liquid causes the greatest static pressure at the bottom of the beaker?

(a) Mercury

(b) Water

(c) Oil

(d) Petrol

Question 17: Static pressure is measured by an instrument called

(a) Barometer

(b) Thermometer

(c) Manometer

(d) Hydrometer

Question 18: A Liquid in the container shown below exerts pressure on point X in the container when it is at sea level.

How does the pressure change if the container is taken to the top of a mountain?

(a) Increases

(b) Decreases

(c) Stays the same

(d) Increases then decreases

Question 19: A liquid is poured into the apparatus shown below.

The level of liquid will be:

(a) Higher in A

(b) Higher in B

(b) Higher in C

(d) The same in A, B, C and D

Fill in the blanks:

Question 20: _________ is the pressure due to the weight of the column of liquid above the object.

Question 21: As the depth _________, static pressure increases.

Question 22: As the density of the liquid increases, static pressure _________.

Question 23: Static decreases as the altitude _________.

Question 24: Static pressure acts in all _________.

Question 25: As diagrammed below, an operator applies a force of 200 N to the first piston of a hydraulic lift, which has an area of 5.4 m².

What is the pressure applied to the hydraulic fluid?

(a) 3.7 Pa

(b) 37 Pa

(c) 0.37 Pa

(d) 370 Pa

Question 26: If the second piston in the lift diagrammed above exerts a force of 41,000 N, and the pressure on the hydraulic fluid by the first piston is 3.7 Pa, what is the area of the second piston?

(a) 110.8 m²

(b) 0.1108 m²

(c) 1.108 m²

(d) 1108 m²

Question 27: In hydraulic machines the pressure applied on one piston will be ________ the pressure transmitted to the second piston.

(a) Greater than

(b) Equal to

(c) Less than

(d) None of the answers is correct.

Question 28: Which of the following machines uses the principle of hydraulics?

(a) Car jack

(b) Garage lift

(c) Car brake

(d) All of the answers are correct.

Question 29: If a force is applied on the piston with small area of a hydraulic machine it will give ________________ force on the piston with the larger area.

(a) a smaller force

(b) a larger force

(c) an equal

(d) none of the answers.

Question 30: Atmospheric pressure is always directed

(a) Up

(b) Down

(c) Sideways

(d) In all directions

Question 31: Atmospheric pressure ___________ as altitude increases.

(a) Decreases

(b) Increases

(c) Stays the same

(d) None of the above

Question 32: Atmospheric pressure is greatest at

(a) The top of the mountain

(b) The sea level

(c) In the space

(d) a and c are correct

Question 33: Where is the atmospheric pressure lowest?

(a) At A

(b) At B

(c) At C

(d) At D

Question 34: The density of air is maximum at:

(a) The top of the mountain

(b) The sea level

(c) In the space

(d) a and c are correct

Question 35: Which instrument is used to measure atmospheric pressure?

(a) Thermometer

(b) Hydrometer

(c) Mercury barometer

(d) None of the answers is correct

Question 36: Which instrument is used to measure gas pressure?

(a) Manometer

(b) Barometer

(c) Hydrometer

(d) None of the answers is correct

Question 37: Which of the instruments below is not used to measure pressure?

Question 38: The picture below shows a mercury barometer.

Which distance is used to measure the pressure of the atmosphere?

(a) 25 cm

(b) 75 cm

(c) 80 cm

(d) 100 cm

Question 39: What is the differential pressure in Kpa

(a) 8 Kpa

(b) 10.64 Kpa

 (c) 1.064 Kpa

(d) 106.4 Kpa

Question 40: What is the atmospheric pressure in Kpa

(a) 1.2 Kpa

(b) 12.156 Kpa

(c) 121.56 Kpa

(d) 1215.6 Kpa

Question 41: What is the pressure of the gas in Kpa

(a) 132.2 Kpa

(b) 13.22 Kpa

(c) 1.322 Kpa

(d) 1322 Kpa

Question 42: Diagram show some air trapped in a cylinder. Diagram 2 shows the same air after the piston has been pushed slowly. The pressure of air in diagram 1 is 1 bar. What will be the pressure of air in diagram 2?

(a) 1 bar

(b) 0.5 bar

(c) 2 bar

(d) None of the answers is correct.

Question 43: At a constant temperature, if the pressure of a gas increases, its volume will

(a) Increase

(b) Decrease

(c) Stays the same

(d) None of the answers is correct.

Question 44: A gas is filled in an expandable cylinder as shown in the diagram below. If the volume of the gas doubled what will happen to its pressure?

(a) It will be doubled

(c) It will be halved

(c) It will stay the same

(d) None of the answers is correct.

Question 45: The picture below represents molecules of a gas contained in a cylinder. If the cylinder is placed in a hot place, how does the piston move?

(a) The piston moves up

(b) The piston moves down

(c) The piston doesn't move

(d) None of the answers is correct

Question 46: A balloon is filled with helium gas. What will happen to the balloon's volume in cold weather?

(a) It will increase

(b) It will decreases

(c) It will increase then decrease

(d) None of the answers is correct

Question 47: What happens to the volume of the air balloon shown below when the air inside the balloon is heated?

(a) Volume increases

(b) Volume decreases

(c) Volume stays the same

(d) None of the answers is correct

Question 48: A gas occupies a volume of 3 liter at a temperature of 250 K and at a pressure of 1.5 bar. What will be the volume if the temperature is increased to 450 K and the pressure remains constant?

(a) 54 liters

(b) 0.54 liters

(c) 540 liters

(d) 5.4 liters

Question 49: The tire shown below is placed in the sun. What happens to the pressure of air inside the tire?

(a) Increases

(b) Decreases

(c) Stays the same

(d) None of the answers is correct.

Question 50: What happens to the balloons when it is heated as shown in the diagram below and why?

(a) It will burst because the pressure inside it will decrease.

(b) It will burst because the pressure inside it will increase.

(c) It will become smaller because its temperature increases.

(d) None of the answers is correct.

Question 51: A gas is filled inside a cylinder that has a fixed volume. The gas is has a pressure of 1 atm when the temperature is 300 K. What will be the pressure if the temperature is decreases to 150 K.

(a) 2 atm

(b) 1 atm

(c) 1.5 atm

(d) 0.5 atm

Question 52: Gas with a volume of 10.0 L is trapped in an expandable cylinder at a pressure of 200 KPa and a temperature of 300 K. If the pressure is tripled and the temperature is increased to 400K, what will be the new volume of the gas?

(a) 4.4 L

(b) 44.66 L

(c) 444.6 L

(d) 4444 L

Question 53: A gas is filled in a cylinder as shown in the diagram below. The gas occupies a volume of 2 litters at a temperature of 300 k and a pressure of 1 bar. What will be its new volume at a pressure of 0.5 bars and a temperature of 600 K.

(a) 2 liters

(b) 4 liters

(c) 6 liters

(d) 8 liters

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