POWER ENGINEERING 4A UNIT 1
ELEMENTARY MECHANICS AND
DYNAMICS 2026 PRACTICE QUESTIONS
AND CORRECT ANSWERS
The ability of a body to do work due to its motion is called ____________
energy.
Select one:
a. Potential
b. Kinetic
c. Maximum
d. Minimum - CORRECT ANSWER-B
A simple wheel and axle has a wheel diameter of 3m and an axle diameter
of 25cm. What effort is required to lift 850kg if the efficiency is 87%?
Select one:
a. 798.7 N
b. 986 N
c. 100.5 N
d. 563.2 N - CORRECT ANSWER-A
A bar is pivoted on the right end and a force is applied upwards on the left
end. The rotation of the bar will be:
Select one:
,a. Downward
b. Upward
c. Clockwise
d. Counter-clockwise - CORRECT ANSWER-C
The force of friction is:
Select one:
a. Not affected by the area of the two surfaces in contact.
b. Applied in the vertical direction.
c. Not affected by the roughness of the two surfaces in contact.
d. Dependent on the area of the two surfaces in contact. - CORRECT
ANSWER-A
A hole 3cm in diameter is to be punched out of a steel plate that is 8cm
thick. The shear stress of the material is 670 GPa. What force is required on
the punch?
Select one:
a. 9036 MN
b. 5051.6 MN
c. 1.6 x 1013 N
d. 4 735 509 GN - CORRECT ANSWER-B
A mass of 400 kg is moved a horizontal distance of 30 m due to a force of
300kN. The amount of work done is:
Select one:
,a. 9000 J
b. 12 000 J
c. 12 000 kJ
d. 9000 kJ - CORRECT ANSWER-D
A wheel and axle has a mechanical advantage of 20. Calculate the diameter
of the wheel if the axle diameter is 5cm.
Select one:
a. 8 cm
b. 10 cm
c. 50 cm
d. 100 cm - CORRECT ANSWER-D
An object of mass 95kg is at a height of 36m above the ground. What is its
potential energy?
Select one:
a. 1.71 kJ
b. 931.95 kJ
c. 3.42 kJ
d. 33.55 kJ - CORRECT ANSWER-D
The rate of doing work is called _________.
Select one:
a. Power
, b. Kinetic energy
c. Potential energy
d. Work - CORRECT ANSWER-A
A block and tackle system has 3 pulleys in each of two blocks. If a
downward effort of 100 N is applied and the machine has an efficiency of
83.6%, what is the maximum mass that can be lifted?
Select one:
a. 501.6 kg
b. 51.1 kg
c. 5113.1 kg
d. 250 kg - CORRECT ANSWER-B
The unit of measure for energy in the SI system is the:
Select one:
a. Work
b. Joule
c. Kilowatt
d. Newton - CORRECT ANSWER-B
If a body travels 850m in 34 seconds, what will its average velocity be, in
km/h?
Select one:
a. 25
b. 900
ELEMENTARY MECHANICS AND
DYNAMICS 2026 PRACTICE QUESTIONS
AND CORRECT ANSWERS
The ability of a body to do work due to its motion is called ____________
energy.
Select one:
a. Potential
b. Kinetic
c. Maximum
d. Minimum - CORRECT ANSWER-B
A simple wheel and axle has a wheel diameter of 3m and an axle diameter
of 25cm. What effort is required to lift 850kg if the efficiency is 87%?
Select one:
a. 798.7 N
b. 986 N
c. 100.5 N
d. 563.2 N - CORRECT ANSWER-A
A bar is pivoted on the right end and a force is applied upwards on the left
end. The rotation of the bar will be:
Select one:
,a. Downward
b. Upward
c. Clockwise
d. Counter-clockwise - CORRECT ANSWER-C
The force of friction is:
Select one:
a. Not affected by the area of the two surfaces in contact.
b. Applied in the vertical direction.
c. Not affected by the roughness of the two surfaces in contact.
d. Dependent on the area of the two surfaces in contact. - CORRECT
ANSWER-A
A hole 3cm in diameter is to be punched out of a steel plate that is 8cm
thick. The shear stress of the material is 670 GPa. What force is required on
the punch?
Select one:
a. 9036 MN
b. 5051.6 MN
c. 1.6 x 1013 N
d. 4 735 509 GN - CORRECT ANSWER-B
A mass of 400 kg is moved a horizontal distance of 30 m due to a force of
300kN. The amount of work done is:
Select one:
,a. 9000 J
b. 12 000 J
c. 12 000 kJ
d. 9000 kJ - CORRECT ANSWER-D
A wheel and axle has a mechanical advantage of 20. Calculate the diameter
of the wheel if the axle diameter is 5cm.
Select one:
a. 8 cm
b. 10 cm
c. 50 cm
d. 100 cm - CORRECT ANSWER-D
An object of mass 95kg is at a height of 36m above the ground. What is its
potential energy?
Select one:
a. 1.71 kJ
b. 931.95 kJ
c. 3.42 kJ
d. 33.55 kJ - CORRECT ANSWER-D
The rate of doing work is called _________.
Select one:
a. Power
, b. Kinetic energy
c. Potential energy
d. Work - CORRECT ANSWER-A
A block and tackle system has 3 pulleys in each of two blocks. If a
downward effort of 100 N is applied and the machine has an efficiency of
83.6%, what is the maximum mass that can be lifted?
Select one:
a. 501.6 kg
b. 51.1 kg
c. 5113.1 kg
d. 250 kg - CORRECT ANSWER-B
The unit of measure for energy in the SI system is the:
Select one:
a. Work
b. Joule
c. Kilowatt
d. Newton - CORRECT ANSWER-B
If a body travels 850m in 34 seconds, what will its average velocity be, in
km/h?
Select one:
a. 25
b. 900
