Power Engineering questions 4a - Math
EXAM LATEST 2026-2027 150 QUESTIONS
AND ANSWERS
1. A scalar quantity has:
a) Necessary units only
b) Numerical size of the quantity only
c) Magnitude only
d) Both magnitude and necessary units
Answer: d) A scalar quantity is fully described by its magnitude and the necessary
units .
2. Velocity may be defined as:
a) Speed
b) Linear speed
c) Speed in a given time
d) Speed in a given direction
Answer: d) Velocity is a vector quantity, defined as speed in a specific direction .
3. Acceleration may be defined as the rate of change of:
a) distance
b) displacement
c) volume
d) velocity
Answer: d) Acceleration is the rate at which velocity changes over time .
4. Which of the following statements is false?
a) Kinetic friction is not affected by a body's speed
b) Friction force is not affected by the area of the surfaces in contact
c) Friction is affected by the relative roughness of the two surfaces
d) Kinetic friction is greater than static friction
Answer: d) Static friction is generally greater than kinetic friction .
,5. The _____________ is the maximum stress value that a material can be
subject to and still return to its original size and shape when the deforming load
is removed.
a) elastic limit
b) allowable stress
c) ultimate stress
d) maximum allowable stress
Answer: a) The elastic limit is the maximum stress a material can withstand and
still return to its original shape .
6. The ability of a material to break without much deformation occurring before
fracture is called:
a) Toughness
b) Brittleness
c) Hardness
d) Ductility
Answer: b) Brittleness is the property of breaking with little prior deformation .
7. If Engineers require a material that can be stretched and reduced in cross-
section without breaking, they would choose a material that is:
a) Tough
b) Elastic
c) Brittle
d) Ductile
Answer: d) Ductility allows a material to be stretched without breaking .
8. The unit of measure for energy in the SI system is the:
a) Newton
b) Watt
c) Joule
d) Pascal
Answer: c) The Joule is the SI unit for energy and work .
9. In simple machines; Velocity Ratio, is defined as:
a) the reaction at the fulcrum to balance the net forces on the system
, b) the ratio of the load to the effort
c) the ratio of the distance moved by the effort to the distance moved by the load
d) the ratio of the work output to the work input
Answer: c) Velocity Ratio (VR) is the ratio of effort distance to load distance .
10. In the SI system, the standard unit when indicating force is the:
a) Joule
b) Watt
c) Newton
d) Pascal
Answer: c) The Newton is the SI unit for force .
11. One cubic metre is equal to:
a) 1 cubic decimetre
b) 1000000 litres
c) 1000 litres
d) 100 cubic decimeters
Answer: c) 1 m³ = 1000 litres .
12. One watt is equal to:
a) 1 joule
b) 1 newton metre
c) 1 joule/s
d) 1 ampere
Answer: c) 1 Watt = 1 Joule per second .
13. If 25 workers can do a piece of work in 30 days, in how many days can 35
workers do the same work?
a) 20.00
b) 18.00
c) 20.25
d) 21.43
Answer: d) This is an inverse proportion problem: (25 × 30) / 35 = 21.43 days .
EXAM LATEST 2026-2027 150 QUESTIONS
AND ANSWERS
1. A scalar quantity has:
a) Necessary units only
b) Numerical size of the quantity only
c) Magnitude only
d) Both magnitude and necessary units
Answer: d) A scalar quantity is fully described by its magnitude and the necessary
units .
2. Velocity may be defined as:
a) Speed
b) Linear speed
c) Speed in a given time
d) Speed in a given direction
Answer: d) Velocity is a vector quantity, defined as speed in a specific direction .
3. Acceleration may be defined as the rate of change of:
a) distance
b) displacement
c) volume
d) velocity
Answer: d) Acceleration is the rate at which velocity changes over time .
4. Which of the following statements is false?
a) Kinetic friction is not affected by a body's speed
b) Friction force is not affected by the area of the surfaces in contact
c) Friction is affected by the relative roughness of the two surfaces
d) Kinetic friction is greater than static friction
Answer: d) Static friction is generally greater than kinetic friction .
,5. The _____________ is the maximum stress value that a material can be
subject to and still return to its original size and shape when the deforming load
is removed.
a) elastic limit
b) allowable stress
c) ultimate stress
d) maximum allowable stress
Answer: a) The elastic limit is the maximum stress a material can withstand and
still return to its original shape .
6. The ability of a material to break without much deformation occurring before
fracture is called:
a) Toughness
b) Brittleness
c) Hardness
d) Ductility
Answer: b) Brittleness is the property of breaking with little prior deformation .
7. If Engineers require a material that can be stretched and reduced in cross-
section without breaking, they would choose a material that is:
a) Tough
b) Elastic
c) Brittle
d) Ductile
Answer: d) Ductility allows a material to be stretched without breaking .
8. The unit of measure for energy in the SI system is the:
a) Newton
b) Watt
c) Joule
d) Pascal
Answer: c) The Joule is the SI unit for energy and work .
9. In simple machines; Velocity Ratio, is defined as:
a) the reaction at the fulcrum to balance the net forces on the system
, b) the ratio of the load to the effort
c) the ratio of the distance moved by the effort to the distance moved by the load
d) the ratio of the work output to the work input
Answer: c) Velocity Ratio (VR) is the ratio of effort distance to load distance .
10. In the SI system, the standard unit when indicating force is the:
a) Joule
b) Watt
c) Newton
d) Pascal
Answer: c) The Newton is the SI unit for force .
11. One cubic metre is equal to:
a) 1 cubic decimetre
b) 1000000 litres
c) 1000 litres
d) 100 cubic decimeters
Answer: c) 1 m³ = 1000 litres .
12. One watt is equal to:
a) 1 joule
b) 1 newton metre
c) 1 joule/s
d) 1 ampere
Answer: c) 1 Watt = 1 Joule per second .
13. If 25 workers can do a piece of work in 30 days, in how many days can 35
workers do the same work?
a) 20.00
b) 18.00
c) 20.25
d) 21.43
Answer: d) This is an inverse proportion problem: (25 × 30) / 35 = 21.43 days .
