PE 3rd Class A1 Exam Questions and Answers Solved Correctly Rated A+
1. In a right angle triangle, the sine of an acute angle is equal to: - 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: - Answers 57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: - Answers 0.0002
As the cosine decreases, the - Answers value of the angle increases
Any two angles whose sum is 90° are: - Answers complementary angles
One is the trigonometric value of: - 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:
- Answers 26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called: - Answers
the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: - 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: - 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: - Answers 10.8 m N of W
The moment of a force about a point is: - 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: - 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: - Answers 0.0723
, Energy can be: - Answers transformed to different forms
Velocity ratio is: - Answers ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: - 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: - Answers 70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if: - Answers
the elastic limit of the material is not exceeded
The factor of safety is always expressed: - Answers as a ratio
When calculating the ultimate stress of a material, we should: - Answers divide the maximum load by
the original cross-sectional area
Safe working stress is determined by: - 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? - Answers 45 kN
When classifying beams, the term simple beam refers to a beam: - Answers that is supported at two
ends
The term _____ is used as a measure of the quantity of matter. - Answers mass
A 10 m long steel pipe when heated to increase its temperature by 85 °C, will expand approximately: -
Answers 1 cm
The most common scale in use is the: - Answers Celsius
Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature
would appear: - Answers white
The amount of heat required to completely melt 25 kg of ice from a temperature of
-10 °C is approximately: - 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: - Answers A. the first law
of thermodynamics
B. Charles' Law
1. In a right angle triangle, the sine of an acute angle is equal to: - 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: - Answers 57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: - Answers 0.0002
As the cosine decreases, the - Answers value of the angle increases
Any two angles whose sum is 90° are: - Answers complementary angles
One is the trigonometric value of: - 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:
- Answers 26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called: - Answers
the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: - 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: - 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: - Answers 10.8 m N of W
The moment of a force about a point is: - 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: - 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: - Answers 0.0723
, Energy can be: - Answers transformed to different forms
Velocity ratio is: - Answers ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: - 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: - Answers 70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if: - Answers
the elastic limit of the material is not exceeded
The factor of safety is always expressed: - Answers as a ratio
When calculating the ultimate stress of a material, we should: - Answers divide the maximum load by
the original cross-sectional area
Safe working stress is determined by: - 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? - Answers 45 kN
When classifying beams, the term simple beam refers to a beam: - Answers that is supported at two
ends
The term _____ is used as a measure of the quantity of matter. - Answers mass
A 10 m long steel pipe when heated to increase its temperature by 85 °C, will expand approximately: -
Answers 1 cm
The most common scale in use is the: - Answers Celsius
Four pieces of iron are heated in a furnace to high temperatures. The one at the highest temperature
would appear: - Answers white
The amount of heat required to completely melt 25 kg of ice from a temperature of
-10 °C is approximately: - 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: - Answers A. the first law
of thermodynamics
B. Charles' Law
