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Determine the atmospheric pressure (in kPa) at a location where the barometric reading is 740 mm Hg and the gravitational acceleration is g = 9.81 m/sec squared. Assume the temperature of mercury to be 10 deg C, at which its density is 13,570 kg/cu. m.

• 99.82

• 111.58

• 89.47

• 98.51

What can you say about the following statement regarding centrifugal pumps? “The discharge of the centrifugal pumps can be throlled without the building up of an excessive pressure or overloading its driving unit.”   I. True   II. False

• II

• Either I or II

• I

• Both I and II

When we observe objects in the water, they appear to be much closer to the surface than they really are. A coin is placed at the bottom of a beaker containing water (n=1.33) and benzene (n=1.5) respectively one above the other. If the depth of the water is 10 cm, while benzene has a depth of 6 cm, what is the height at which the image of the coin will appear?

• 10.5

• 11.5

• 12.5

• 10

In a certain experiment, argon effuses from a porous cup at 4.0mmol/min. How fast would chlorine effuse under the same conditions?*

1/1

• 5 mmol/min

• 3 mmol/min

• 6 mmol/min

• 4 mmol/min

What is the maximum moment of a beam supported at both ends and carries a uniform load of w throughout its entire length?

• wL2/8

• wL/8

• wL2/4

• wL/2

Modulus of rigidity is also known as

• Modulus of elasticity

• Bulk modulus

• Shear modulus

   

• Young's modulus

How many electrons flow through a light LED bulb each second if the current through the light LED bulb is 0.75 A?

• 5.6 x 10^18

• 4.7 x 10^18

• 6.5 x 10^18

• 7.4 x 10^18

In an engine cylinder of steel has a cross-sectional area of 1.2 cm2 and a length of 2 cm at 23°C. When it heated to 90°C, what compressive force would have to be applied to it keep it from expanding? For steel, α = 0.000012/C and Young’s modulus is Y = 20 x 10^10 Pa.

• 19,296 N

• 17,688 N

• 16,080 N

• 20,904 N

The leaning tower of Pisa is 54.5 m tall. Supposedly Galileo investigated the behaviour of falling objects by dropping them from the top of this tower and timing their descent. How long in seconds would it take an object to fall 54.5 m if air effects are negligible?

• 3.33

• 33.3

• 34.8

• 3.48

What type of knot is used to protect sockets in extension cords?

• fire

• sheep shank

• clove hitch

• under-writer