Plumbing Science Quiz 4

WHEN WATER FREEZES/TURNS TO ICE IT EXPANDS BY

• 5%
• 10%
• 15%
• 20%

AT WHAT TEMPERATURE DOES WATER REACH ITS MAXIMUM DENSITY?

• 0 deg c
• 1 deg c
• 4 deg c
• 7 deg c

THE PRESSURE EXERTED BY A LIQUID CAN BE DESCRIBED AS MOVING IN

• AN OUTWARDS DIRECTION ONLY.
• AN UPWARDS DIRECTION ONLY.
• A DOWNWARDS DIRECTION ONLY.
• A DOWNWARDS AND OUTWARDS DIRECTION.

WHICH ONE OF THE CALCULATIONS LISTED GIVES THE INTENSITY OF PRESSURE OF THE WATER ENTERING A CISTERN ?

• ?.?m x ?m x 9.81 KN/m3.
• ?m x 9.81 KN/m2.
• 1.5m x 2m
• ? x ?.? x ?m x 9.81 KN/m3

IT IS IMPORTANT TO MAINTAIN A ‘SELF CLEANSING’ VELOCITY IN A WASTE PIPE IN ORDER TO

• PREVENT EXCESS PRESSURE BEING CREATED.
• PREVENT THE BUILD UP OF SOLIDS.
• ALLOW THE BUILD UP OF SOLIDS.
• ALLOW SMALLER PIPES TO BE USED.

WHICH ONE OF THE FOLLOWING APPLIANCES CAN USE THE PRINCIPLE OF SIPHONIC ACTION?

• OVERHEAD SHOWER.
• BIDET.
• WASHING MACHINE.
• WC CITERN FLUSH MECHANISM.

IF THE TEMPERATURE OF WATER INCREASES, THE

• DENSITY DECREASES.
• DENSITY STAYS CONSTANT.
• DENSITY INCREASES.
• MASS INCREASES.

THE CORRECT UNIT OF MEASUREMENT FOR THE SPECIFIC HEAT CAPACITY OF A MATERIAL IS

• Kg/m3.
• M3/ deg c.
• Kj/kg.
• Kj/kg/ deg c.

WHICH ONE OF THE FOLLOWING METHODS OF HEAT TRANSFER OCCURS BETWEEN TWO BODIES (SURFACES) WITH NO MATERIAL MEDIUM BETWEEN THEM?

• RADIATION.
• CANVECTION.
• CONDUCTION.
• PERCOLATION.

THE ACIDITY OR ALKALINITY OF WATER IS MEASURED ACCORDING TO ITS

• PH VALUE.
• HP VALUE.
• Hz VALUE.
• Ps VALUE.