In a right angle triangle, the sine of an acute angle is equal to:
Answer: D
If a right-angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm, the length of the opposite side is:
Answer: B
In the equation 0.004 + D = 0.0042, the value of D is:
Answer: C
As the cosine decreases, the
Any two angles whose sum is 90o are:
Answer: A
One is the trigonometric value of:
A automobile travels at 60 miles per hour. Expressed in metres per second, this would be equivalent to:
The force that is equal in magnitude but opposite in direction to the resultant force is called:
A scalar quantity is one which has only magnitude and can be fully described by:
A body can be put into equilibrium by applying an additional force equal in magnitude but opposite in direction to the:
A displacement of 9 m north of point A, and another of 6 m west of point A can be added to give a resultant displacement from point A of:
Answer: E
The moment of a force about a point is:
When the co-efficient of friction increases and the force between two surfaces remains constant, the friction force will:
A body having a gravitational force of 2000 N, is pulled along a horizontal surface at constant speed by a rope that makes an angle of 20o above the horizontal. If the pull on the rope is 150 N, the coefficient of sliding friction is:
Energy can be:
Velocity ratio is:
A 1 N weight has a kinetic energy of 1 J when its speed is:
The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7 would be:
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if:
The factor of safety is always expressed:
When calculating the ultimate stress of a material, we should:
Safe working stress is determined by:
A 6 m long cantilever beam carries a concentrated load of 45 kN at its free end. What is the shear force at the wall?
When classifying beams, the term simple beam refers to a beam:
The term _____ is used as a measure of the quantity of matter.
A 10 m long steel pipe when heated to increase its temperature by 85° C, will expand approximately:
The most common scale in use is the:
Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature would appear:
The amount of heat required to completely melt 25 kg of ice from a temperature of –10o C is approximately:
"Heat will flow from a hot substance to a colder substance unaided, but it is impossible for heat to flow from a cold substance to a hotter one without the aid of mechanical work" is:
The heat required to raise the temperature of water at a pressure of 225 kPa from 0C to 124C is:
When heat is supplied to a liquid in sufficient quantity to change the liquid to a vapour without changing the temperature, the heat supplied is known as:
The dryness fraction of steam at a pressure of 400 kPa and a heat content of 2500 kJ/kg is:
The temperature of saturated steam vapor at 980 kPa is:
Steam engines, steam turbines, gas turbines and internal combustion engines are examples of:
The rate at which heat flow through a slab of a material does not depend on:
Expansion of a gas is said to be adiabatic when expansion takes place at :
If 10 m3 of a gas at a pressure of 20 kPa (gauge) and a temperature of 10o C are compressed to 5 m3 while the temperature is reduced to –20o C, the final gauge pressure will be: (Consider the atmospheric pressure to be 95 kPa)
Use of the equation PV = a constant, means the numerical result of pressure times volume for a compression or expansion process will:
A gas occupies 8.62 m3 at 1800 kPa and 26C. It is heated until the final volume is 9.0 m3 and pressure is 2500 kPa. the final temperature will be approximately:
H2SO4 is the chemical formula for:
Protons have a mass number of:
A pinch of salt is added to a glass of water. The result is:
Compounds classified as salts may have the following characteristics:
The most common material used in making large industrial diesel engine pistons is:
Malleable cast iron is produced by:
Steam turbine bearings are usually made of:
