PE 3rd Class A1 || with complete solution.
1. In a right angle triangle, the sine of an acute angle is equal to: correct answers opposite side /
hypotenuse
If a right-angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm,
the length of the opposite side is: correct answers 57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: correct answers 0.0002
As the cosine decreases, the correct answers value of the angle increases
Any two angles whose sum is 90° are: correct answers complementary angles
One is the trigonometric value of: correct answers A. sine of 90°
B. cosine of 0°
C. tangent of 45°
A automobile travels at 60 miles per hour. Expressed in metres per second, this would be
equivalent to: correct answers 26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called:
correct answers the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: correct answers
a number with the necessary unit
,A body can be put into equilibrium by applying an additional force equal in magnitude but
opposite in direction to the: correct answers resultant
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: correct answers 10.8 m N of W
The moment of a force about a point is: correct answers a twisting or turning effect
When the co-efficient of friction increases and the force between two surfaces remains constant,
the friction force will: correct answers increase
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 20° above the horizontal. If the pull on the rope is 150 N,
the coefficient of sliding friction is: correct answers 0.0723
Energy can be: correct answers transformed to different forms
Velocity ratio is: correct answers ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: correct answers 4.4 m/s
The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7
would be: correct answers 70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if:
correct answers the elastic limit of the material is not exceeded
The factor of safety is always expressed: correct answers as a ratio
, When calculating the ultimate stress of a material, we should: correct answers divide the
maximum load by the original cross-sectional area
Safe working stress is determined by: correct answers dividing the ultimate strength by the factor
of safety
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? correct answers 45 kN
When classifying beams, the term simple beam refers to a beam: correct answers that is
supported at two ends
The term _____ is used as a measure of the quantity of matter. correct answers mass
A 10 m long steel pipe when heated to increase its temperature by 85 °C, will expand
approximately: correct answers 1 cm
The most common scale in use is the: correct answers Celsius
Four pieces of iron are heated in a furnace to high temperatures. The one at the highest
temperature would appear: correct answers white
The amount of heat required to completely melt 25 kg of ice from a temperature of
-10 °C is approximately: correct answers 8908 kJ
"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: correct
answers A. the first law of thermodynamics
B. Charles' Law
C. the mechanical equivalent of heat
1. In a right angle triangle, the sine of an acute angle is equal to: correct answers opposite side /
hypotenuse
If a right-angle triangle has an angle of 28O 37' and the hypotenuse is 120 mm,
the length of the opposite side is: correct answers 57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: correct answers 0.0002
As the cosine decreases, the correct answers value of the angle increases
Any two angles whose sum is 90° are: correct answers complementary angles
One is the trigonometric value of: correct answers A. sine of 90°
B. cosine of 0°
C. tangent of 45°
A automobile travels at 60 miles per hour. Expressed in metres per second, this would be
equivalent to: correct answers 26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called:
correct answers the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: correct answers
a number with the necessary unit
,A body can be put into equilibrium by applying an additional force equal in magnitude but
opposite in direction to the: correct answers resultant
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: correct answers 10.8 m N of W
The moment of a force about a point is: correct answers a twisting or turning effect
When the co-efficient of friction increases and the force between two surfaces remains constant,
the friction force will: correct answers increase
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 20° above the horizontal. If the pull on the rope is 150 N,
the coefficient of sliding friction is: correct answers 0.0723
Energy can be: correct answers transformed to different forms
Velocity ratio is: correct answers ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: correct answers 4.4 m/s
The working stress of a material that has an ultimate strength of 490 MPa and a safety factor of 7
would be: correct answers 70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if:
correct answers the elastic limit of the material is not exceeded
The factor of safety is always expressed: correct answers as a ratio
, When calculating the ultimate stress of a material, we should: correct answers divide the
maximum load by the original cross-sectional area
Safe working stress is determined by: correct answers dividing the ultimate strength by the factor
of safety
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? correct answers 45 kN
When classifying beams, the term simple beam refers to a beam: correct answers that is
supported at two ends
The term _____ is used as a measure of the quantity of matter. correct answers mass
A 10 m long steel pipe when heated to increase its temperature by 85 °C, will expand
approximately: correct answers 1 cm
The most common scale in use is the: correct answers Celsius
Four pieces of iron are heated in a furnace to high temperatures. The one at the highest
temperature would appear: correct answers white
The amount of heat required to completely melt 25 kg of ice from a temperature of
-10 °C is approximately: correct answers 8908 kJ
"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: correct
answers A. the first law of thermodynamics
B. Charles' Law
C. the mechanical equivalent of heat
