ASTB MECHANICAL COMPREHENSION EXAM
QUIZZES & ANS!!.
If gear B makes 5 revolutions, how many revolutions will gear A make?
3
If block A, on which the lever is resting, is moved nearer to block B,
it will be easier to lift block B but it will not be lifted as high
A gear system derives the greatest amount of mechanical advantage if a 10-tooth
gear drives a
30-tooth gear
The figure shows two water tanks, P and Q. They are the same size and placed at
the same height above the ground, and both are initially full of water. Which water
tower will provide more water for the thirsty troops?
Tanks Q
What is the value of F in the pound to balance the lever shown below?
11 lbs
If two or more forces act on an object in such a way that the object does not
move, what is this condition called?
equilibrium
What physical forces are the descending airborne paratrooper primarily affected
by?
drag and gravity
The names of the process of transferring heat from one location to another are
radiation, convection, and —
conduction
When salt is dissolved in water, it —
increase the boiling point
What is the process called when liquid is changed to vapor?
evaporation
When water confined in a closed container is heated without letting the steam
escape, the pressure inside the container increases. What happens to the
temperature of the water while it is boiling?
The temperature of the water remains constant.
Pulley X is the driver and turns clockwise. Which pulley will turn the slowest?
Pulley W
When air is compressed in a closed space, —
the volume of the air decreases, the temperature increases.
When opposite poles of two magnets are made to face each other —
the magnets will pull together
When two magnets have like poles facing each other,
they will repel each other
The difference between weight and mass is that —
mass remains constant, but weight depends on altitude
If the water in a stream is flowing through narrow and wide sections, which one
will be true?
, Water is flowing faster through the narrow section.
What is true about static electricity?
Static electricity is neither direct current (DC) nor alternating current (AC)
An object is dropped which takes seconds to hit the ground. What is its final
velocity in ft/s? [g=32.7 ft/s^2]
482.55 ft/s
An object is dropped which takes seconds to hit the ground. What is its final
velocity in m/s? [g=9.81 m/s^2]
98.1 m/s
Which of these wrenches is likely to provide the greatest torque with a fixed
force?
Wrench X
Which color absorbs the most radiation?
Black
A pure solid substance melts at 51°C. If the substance is known to change phase
at 171°C, what is the state of the substance at 172°C?
Gas
A ball is thrown horizontally off a cliff. At the same time, another ball is dropped
off the cliff. How long after the dropped ball hits the ground will the thrown ball
hit? The effect of air resistance is ignored.
they will hit at the same time
A balloon filled with air is placed at a depth of 50 feet underwater. The value of
the volume of the balloon is V and the pressure on its wall is P. If the balloon is
taken to a depth of 100 feet, what will happen to the value of V and P?
V will decrease and P will increase
A ball is pushed down into a vertical spring and then released. After release, the
ball flies upward. Which is the best description of the states of energy in the
spring to the ball?
spring potential energy is converted to kinetic energy in the spring and the ball
Which device can be used to measure current in an electrical system?
Multimeter
The cam rotates at 10 rpm. How many times will the follower needle move up-
down in a minute?
40
Which relation does Newton's second law give?
F=ma where is force, is mess and is acceleration
Which of the following is the electrical component that produces a voltage
difference across it?
resistor
A block is moving up the plane by a force of P over an inclined rough plane. The
figure below shows the force acting on the block. What is the possible name of
force F?
Friction
A block is in equilibrium on an inclined rough surface supported by a force P. N
is a normal reaction, W is weight, and F is friction. Which one of the following is
true?
QUIZZES & ANS!!.
If gear B makes 5 revolutions, how many revolutions will gear A make?
3
If block A, on which the lever is resting, is moved nearer to block B,
it will be easier to lift block B but it will not be lifted as high
A gear system derives the greatest amount of mechanical advantage if a 10-tooth
gear drives a
30-tooth gear
The figure shows two water tanks, P and Q. They are the same size and placed at
the same height above the ground, and both are initially full of water. Which water
tower will provide more water for the thirsty troops?
Tanks Q
What is the value of F in the pound to balance the lever shown below?
11 lbs
If two or more forces act on an object in such a way that the object does not
move, what is this condition called?
equilibrium
What physical forces are the descending airborne paratrooper primarily affected
by?
drag and gravity
The names of the process of transferring heat from one location to another are
radiation, convection, and —
conduction
When salt is dissolved in water, it —
increase the boiling point
What is the process called when liquid is changed to vapor?
evaporation
When water confined in a closed container is heated without letting the steam
escape, the pressure inside the container increases. What happens to the
temperature of the water while it is boiling?
The temperature of the water remains constant.
Pulley X is the driver and turns clockwise. Which pulley will turn the slowest?
Pulley W
When air is compressed in a closed space, —
the volume of the air decreases, the temperature increases.
When opposite poles of two magnets are made to face each other —
the magnets will pull together
When two magnets have like poles facing each other,
they will repel each other
The difference between weight and mass is that —
mass remains constant, but weight depends on altitude
If the water in a stream is flowing through narrow and wide sections, which one
will be true?
, Water is flowing faster through the narrow section.
What is true about static electricity?
Static electricity is neither direct current (DC) nor alternating current (AC)
An object is dropped which takes seconds to hit the ground. What is its final
velocity in ft/s? [g=32.7 ft/s^2]
482.55 ft/s
An object is dropped which takes seconds to hit the ground. What is its final
velocity in m/s? [g=9.81 m/s^2]
98.1 m/s
Which of these wrenches is likely to provide the greatest torque with a fixed
force?
Wrench X
Which color absorbs the most radiation?
Black
A pure solid substance melts at 51°C. If the substance is known to change phase
at 171°C, what is the state of the substance at 172°C?
Gas
A ball is thrown horizontally off a cliff. At the same time, another ball is dropped
off the cliff. How long after the dropped ball hits the ground will the thrown ball
hit? The effect of air resistance is ignored.
they will hit at the same time
A balloon filled with air is placed at a depth of 50 feet underwater. The value of
the volume of the balloon is V and the pressure on its wall is P. If the balloon is
taken to a depth of 100 feet, what will happen to the value of V and P?
V will decrease and P will increase
A ball is pushed down into a vertical spring and then released. After release, the
ball flies upward. Which is the best description of the states of energy in the
spring to the ball?
spring potential energy is converted to kinetic energy in the spring and the ball
Which device can be used to measure current in an electrical system?
Multimeter
The cam rotates at 10 rpm. How many times will the follower needle move up-
down in a minute?
40
Which relation does Newton's second law give?
F=ma where is force, is mess and is acceleration
Which of the following is the electrical component that produces a voltage
difference across it?
resistor
A block is moving up the plane by a force of P over an inclined rough plane. The
figure below shows the force acting on the block. What is the possible name of
force F?
Friction
A block is in equilibrium on an inclined rough surface supported by a force P. N
is a normal reaction, W is weight, and F is friction. Which one of the following is
true?
