3A1 ABSA |633 questions with accurate answers
516. Corrosion is defined as? Ans✓✓✓ c. The destruction of a metal by
chemical or electrochemical reaction with its environment.
1. The types of expansions or compressions that may be represented by
pressure-volume diagrams are for:
1. Constant pressure
2. Constant temperature
3. Adiabatic
4. Constant volume
5. Isothermal Ans✓✓✓ *d. 1, 2, 3, 5
10. The logarithm of the number 0.00347 is: Ans✓✓✓ *e. -2.4596
100. A wooden box is loaded and its mass is 40 kg. A force of 150 N
just sets it in motion. If this force is increased to 170 N, what will occur?
Ans✓✓✓ b. The wooden box will accelerate.
101. A body having a mass of 50.97 kg is pulled along a horizontal flat
surface at a constant speed by a force of 180 N, which makes an angle of
+30° with the horizontal. Find the coefficient of kinetic friction for the
surfaces. Ans✓✓✓ a. 0.311
102. A body of 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: Ans✓✓✓ e. 0.0723
103. Find the value and applied angle of the least force required to move
a vessel, if the mass of the vessel is 1650 kg and the coefficient of
friction is 0.49. Ans✓✓✓ a. 7931 N, 26.10°
104. A load of 750 kg just starts to move when the friction angle is 10°.
What effort must be applied parallel to the inclined surface to stop the
motion of the block? Ans✓✓✓ c. 1297.33 N
105. A 1000 kg body is pulled along a horizontal surface at a constant
speed by a rope that makes an angle of 15° above horizontal. If the pull
on the rope is 150 N, the coefficient of friction is: Ans✓✓✓ b. 0.0148
106. A refrigerator is sets on a perfect level surface and has a mass of
150 kg. It is pushed by a force of 35° N acting at 30° to the supporting
surface for the refrigerator. Assume that the coefficient of friction
between the refrigerator and the suppoting surface is 0.25. What will
happen to the refrigerator? Ans✓✓✓ d. The refrigerator will tip.
107. A sliding face of a slide valve of a steam engine is 150 mm by 300
mm, and the steam pressure on the back of the valve is 1200 kN/m2. If
the coefficient of friction is 0.02, what is the force required to move the
valve? Ans✓✓✓ c. 1080 N
,108. A man has a mass of 70 kg. What is the magnitude of the largest
mass he can pull by a horizontal rope along a horizontal floor, if the
coefficient of friction between the mass and the floor is 0.23, and that
between his boot soles and the floor is 0.5? Ans✓✓✓ a. 152.2 kg
109. A block of stone of 40 kg is hauled along a horizontal floor by a
force inclined 20° to the horizontal. If the coefficient of friction between
the stone and the floor is 0.3, determine the effort required to just move
the stone from rest. Ans✓✓✓ d. 112.9 N
11. What is the value of X in the following fractional equation:
X/2 + 3X/4 = 4.5/3 Ans✓✓✓ *b. 1.2
110. Force of friction always? Ans✓✓✓ b. Goes against the applied
force.
111. The relationship between the static friction and kinetic friction is as
follows: Ans✓✓✓ a. The static friction is always greater than the
kinetic
112. To increase the frictional force, it is necessary to? Ans✓✓✓ a.
Increase the roughness of at least one of the surfaces in contact.
113. Kinetic friction is always less than? Ans✓✓✓ a. Static friction
, 114. When the co-efficient of friction increases, and the force between
the two surfaces remains constant, the friction force will? Ans✓✓✓ c.
Increase
115. If an object initially at rest on a horizontal surface is pushed by a
force F making 20° to the horizontal surface, then the frictional force
developed between the contact surfaces is __________ as compared to
when the force is applied horizontally to the body. Ans✓✓✓ c.
Increased
116. Distance is: Ans✓✓✓ c. A scalar quantity
117. Velocity:
1. Refers to a body's speed in a certain direction
2. Is displacement divided by time
3. Is a vector quantity
4. Is a scalar quantity Ans✓✓✓ a. 1, 2, 3
118. Displacement is: Ans✓✓✓ a. A vector quantity
119. Acceleration is: Ans✓✓✓ b. A body's rate of change of velocity
12. When converting the logarithm 3.1635 to a number the number will
be: Ans✓✓✓ *d. 1457.0
516. Corrosion is defined as? Ans✓✓✓ c. The destruction of a metal by
chemical or electrochemical reaction with its environment.
1. The types of expansions or compressions that may be represented by
pressure-volume diagrams are for:
1. Constant pressure
2. Constant temperature
3. Adiabatic
4. Constant volume
5. Isothermal Ans✓✓✓ *d. 1, 2, 3, 5
10. The logarithm of the number 0.00347 is: Ans✓✓✓ *e. -2.4596
100. A wooden box is loaded and its mass is 40 kg. A force of 150 N
just sets it in motion. If this force is increased to 170 N, what will occur?
Ans✓✓✓ b. The wooden box will accelerate.
101. A body having a mass of 50.97 kg is pulled along a horizontal flat
surface at a constant speed by a force of 180 N, which makes an angle of
+30° with the horizontal. Find the coefficient of kinetic friction for the
surfaces. Ans✓✓✓ a. 0.311
102. A body of 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: Ans✓✓✓ e. 0.0723
103. Find the value and applied angle of the least force required to move
a vessel, if the mass of the vessel is 1650 kg and the coefficient of
friction is 0.49. Ans✓✓✓ a. 7931 N, 26.10°
104. A load of 750 kg just starts to move when the friction angle is 10°.
What effort must be applied parallel to the inclined surface to stop the
motion of the block? Ans✓✓✓ c. 1297.33 N
105. A 1000 kg body is pulled along a horizontal surface at a constant
speed by a rope that makes an angle of 15° above horizontal. If the pull
on the rope is 150 N, the coefficient of friction is: Ans✓✓✓ b. 0.0148
106. A refrigerator is sets on a perfect level surface and has a mass of
150 kg. It is pushed by a force of 35° N acting at 30° to the supporting
surface for the refrigerator. Assume that the coefficient of friction
between the refrigerator and the suppoting surface is 0.25. What will
happen to the refrigerator? Ans✓✓✓ d. The refrigerator will tip.
107. A sliding face of a slide valve of a steam engine is 150 mm by 300
mm, and the steam pressure on the back of the valve is 1200 kN/m2. If
the coefficient of friction is 0.02, what is the force required to move the
valve? Ans✓✓✓ c. 1080 N
,108. A man has a mass of 70 kg. What is the magnitude of the largest
mass he can pull by a horizontal rope along a horizontal floor, if the
coefficient of friction between the mass and the floor is 0.23, and that
between his boot soles and the floor is 0.5? Ans✓✓✓ a. 152.2 kg
109. A block of stone of 40 kg is hauled along a horizontal floor by a
force inclined 20° to the horizontal. If the coefficient of friction between
the stone and the floor is 0.3, determine the effort required to just move
the stone from rest. Ans✓✓✓ d. 112.9 N
11. What is the value of X in the following fractional equation:
X/2 + 3X/4 = 4.5/3 Ans✓✓✓ *b. 1.2
110. Force of friction always? Ans✓✓✓ b. Goes against the applied
force.
111. The relationship between the static friction and kinetic friction is as
follows: Ans✓✓✓ a. The static friction is always greater than the
kinetic
112. To increase the frictional force, it is necessary to? Ans✓✓✓ a.
Increase the roughness of at least one of the surfaces in contact.
113. Kinetic friction is always less than? Ans✓✓✓ a. Static friction
, 114. When the co-efficient of friction increases, and the force between
the two surfaces remains constant, the friction force will? Ans✓✓✓ c.
Increase
115. If an object initially at rest on a horizontal surface is pushed by a
force F making 20° to the horizontal surface, then the frictional force
developed between the contact surfaces is __________ as compared to
when the force is applied horizontally to the body. Ans✓✓✓ c.
Increased
116. Distance is: Ans✓✓✓ c. A scalar quantity
117. Velocity:
1. Refers to a body's speed in a certain direction
2. Is displacement divided by time
3. Is a vector quantity
4. Is a scalar quantity Ans✓✓✓ a. 1, 2, 3
118. Displacement is: Ans✓✓✓ a. A vector quantity
119. Acceleration is: Ans✓✓✓ b. A body's rate of change of velocity
12. When converting the logarithm 3.1635 to a number the number will
be: Ans✓✓✓ *d. 1457.0
