PE 3rd Class A1 questions with
complete solutions graded A+
1. In a right angle triangle, the sine of an acute angle is equal to: - correct answer ✔✔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 answer ✔✔57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: - correct answer ✔✔0.0002
As the cosine decreases, the - correct answer ✔✔value of the angle increases
Any two angles whose sum is 90° are: - correct answer ✔✔complementary angles
One is the trigonometric value of: - correct answer ✔✔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 answer ✔✔26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called: - correct
answer ✔✔the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: - correct answer ✔✔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 answer ✔✔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 answer ✔✔10.8 m N of W
The moment of a force about a point is: - correct answer ✔✔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 answer ✔✔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 answer ✔✔0.0723
Energy can be: - correct answer ✔✔transformed to different forms
Velocity ratio is: - correct answer ✔✔ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: - correct answer ✔✔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 answer ✔✔70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if: - correct
answer ✔✔the elastic limit of the material is not exceeded
The factor of safety is always expressed: - correct answer ✔✔as a ratio
When calculating the ultimate stress of a material, we should: - correct answer ✔✔divide the maximum
load by the original cross-sectional area
complete solutions graded A+
1. In a right angle triangle, the sine of an acute angle is equal to: - correct answer ✔✔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 answer ✔✔57.48 mm
In the equation 0.004 + D = 0.0042, the value of D is: - correct answer ✔✔0.0002
As the cosine decreases, the - correct answer ✔✔value of the angle increases
Any two angles whose sum is 90° are: - correct answer ✔✔complementary angles
One is the trigonometric value of: - correct answer ✔✔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 answer ✔✔26.81 m/s
The force that is equal in magnitude but opposite in direction to the resultant force is called: - correct
answer ✔✔the equilibrant
A scalar quantity is one which has only magnitude and can be fully described by: - correct answer ✔✔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 answer ✔✔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 answer ✔✔10.8 m N of W
The moment of a force about a point is: - correct answer ✔✔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 answer ✔✔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 answer ✔✔0.0723
Energy can be: - correct answer ✔✔transformed to different forms
Velocity ratio is: - correct answer ✔✔ideal mechanical advantage
A 1 N weight has a kinetic energy of 1 J when its speed is: - correct answer ✔✔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 answer ✔✔70 MPa
According to Hooke's Law, the stress in an elastic body is directly proportional to the strain if: - correct
answer ✔✔the elastic limit of the material is not exceeded
The factor of safety is always expressed: - correct answer ✔✔as a ratio
When calculating the ultimate stress of a material, we should: - correct answer ✔✔divide the maximum
load by the original cross-sectional area
