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Ch. 17-Review
Test Description: Part 1
Instructions: Answer all questions to get your test result.
1) The work output of a machine divided by the work input is the ________________ of the machine.
A
efficiency
B
effort
C
resistance
D
power
2) The lowest possible temperature is ________________.
A
-273 F
B
0 K
C
-273 K
D
0
3) An inclined plane with one or two sloping sides forms a machine called a
A
ramp
B
wedge
C
pulley
D
lever
4) A fixed, single pulley that is used to lift a block does which one of the following?
A
decreases the force required to lift the block
B
makes the block easier to lift by changing the direction of the force needed to lift it
C
decreases the force required and changes the direction of the force required
D
doubles the required to lift the block
5) A place where molecules are far apart is a _______________________.
A
refraction
B
reflection
C
rarefaction
D
compression
6) The rate at which work is done is calles __________________________.
A
effort time
B
efficiency
C
force
D
power
7) Which one of the following in NOT an example of an electromagnetic wave?
A
x-rays
B
red light
C
sound wave
D
gamma rays
8) A heat engine __________________.
A
changes mechanical energy to thermal energy
B
changes thermal energy into mechanical energy
C
changes mechanical energy into electrical energy
D
changes kinetic energy into thermal energy
9) A machine that changes only the direction of a force has a mechanical advantage of _________.
A
1
B
2
C
10
D
100
10) A slanted surface used to raise an object is a(n) ____________________________.
A
efficiency board
B
wedge
C
inclined plane
D
effort ramp
*select an answer for all questions
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