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- 1. Multiple Choice
The half-life of cadmium-109 is 464 days. A scientist measures out a 256 gram sample. Approximately how many grams of cadmium-109 would remain after 1,392 days?
32
64
2048
1024
- 2. Multiple Choice
A scientist is measuring the mass of two boron atoms. One atom has a mass of 10 units. The other atom has a mass of 11 units. Which subatomic particle needs to be removed from the model to represent a boron atom with a mass of 10 units?
Electron
Nucleus
Neutron
Proton
- 3. Multiple Choice
The elements neon and argon are not reactive. Which hypothesis BEST explains this?
They are not stable atoms.
They are not readily available on Earth.
They tend to give up all of their valence electrons easily.
They have the maximum possible number of electrons in their outermost shell.
- 4. Multiple Choice
Metals in group 1 on the periodic table most commonly form which type of ion?
2- ion
1- ion
1+ ion
2+ ion
- 5. Multiple Choice
Use this chemical equation to answer the question. _CuS + _KCl -> _CuCl2 + _K2S What coefficient of KCl will balance the equation?
1
2
3
4
- 6. Multiple Choice
Use this chemical equation to answer the question. _Fe + O2 -> _Fe2O3 What coefficients of Fe, O2 and Fe2O3 will show that matter is conserved in this chemical reaction?
2, 1, 2
2, 3, 2
4, 1, 2
4, 3, 2
- 7. Multiple Choice
A student pulls a lever down 4 m. The lever lifts a box that weighs 20 N up a distance of 2 m. How much work was done on the box?
10 J
40 J
80 J
160 J
- 8. Multiple Choice
Which claim about current is shown to be mathematically supported from the relationship between the voltage, the current, and the resistance?
claim 1: I = V + R
claim 2: I = V - R
claim 3: I = V x R
claim 4: I = V / R
- 9. Multiple Choice
A parallel circuit contains a battery with a voltage of 9 volts. he total resistance in the circuit is 18 ohms. Which claim about the current in the circuit can be supported mathematically from the relationships between voltage, current, and resistance?
claim 1: the current flowing through the circuit is 0.5 amps because current is related to voltage and resistance by the formula I = V/R
claim 2: the current flowing through the circuit is 2 amps because current is related to voltage and resistance by the formula I = R/V
claim 3: the current flowing through the circuit is 27 amps because current is related to voltage and resistance by the formula I = R + V
claim 4: the current flowing through the circuit is 162 amps because current is related to voltage and resistance by the formula I = VR
- 10. Multiple Choice
Charlie lifts a box with a force of 500 N and sets it on a table top 1.2 m above its starting position. Lauren pushes an identical box up a 5 m ramp from the floor to the top of the same table. Which person did more work?
Charlie did more work.
Lauren did more work.
Both Charlie and Lauren did the same amount of work.
The size of each individual must be known to determine who did more work.
- 11. Multiple Choice
If a large force is exerted on an object, when is no work performed?
when the object moves
when the object does not move
when the power is too large
when there is no friction
- 12. Multiple Choice
A baker pushes a cart full of rolls with a force of 20.0 N for a distance of 4.0 m. How much work does the baker do on the cart?
.20 J
5 J
16 J
80 J
- 13. Multiple Choice
How much work does Juanita do if she uses a force of 40 newtons to pull 2 friends on a wagon for 32 meters?
1.25 J
640 N
1280 J
1280 N
- 14. Multiple Choice
Darla pushed a cart with 50 newtons of force 100 meters away from her house. How much work, measured in joules (J), did she do to move the cart?
2 J
50 J
150 J
5000 J
- 15. Multiple Choice
What is the mechanical advantage of a pulley system with 4 pulleys?
2
3
4
5
- 16. Multiple Choice
A lever is used to remove a rock from the ground. Which lever shown below has the greatest mechanical advantage?
A lever with a lot of thickness and a medium length
A lever with not a lot of thickness and a long length
A lever with not a lot of thickness and a medium length
A lever with a lot of thickness and a short length
- 17. Multiple Choice
A construction crew must use a lever to lift a boulder. The mechanical advantage of the lever is 6 and the lever applies a force of 1600 N to the rock. What is the force that the construction crew must apply to the lever?
134 N
267 N
380 N
534 N
- 18. Multiple Choice
Luisa used a claw hammer to remove nails from a piece of wood she wants to paint. What is the effort distance for a claw hammer if the resistance distance is 6.0 cm and the mechanical advantage is 6.0?
24
27
30
36
- 19. Multiple Choice
Mona has locked herself out of her house. She wants to use a crow bar to open the door. The effort length of the crowbar is 48 cm and mechanical advantage of the crowbar is 6. What is the resistance length of the crowbar?
6 cm
8 cm
10 cm
12 cm
- 20. Multiple Choice
The inclined plane shown below is being used to lift a box 6.0 feet. The inclined plane has a mechanical advantage of 1.5. What is the length, x, of the inclined plane?
.25 feet
2.5 feet
7.5 feet
9 feet
- 21. Multiple Choice
A college student has just bought a small computer that weighs 50 N. To reach her apartment on the 5th floor, which is 35 meters up, she must climb the stairs. How much work must she do to take her computer up the stairs?
15 J
50 J
85 J
1750 J
- 22. Multiple Choice
Jennifer watched as movers used a ramp to load a heavy dresser into a moving truck. The dresser, that had to be lifted 1.5 m from the street to the back of the moving truck, was pushed along a 6.6 m ramp. What is the mechanical advantage of the ramp?
2.98
3.06
4
4
- 23. Multiple Choice
Which is the best way to increase the mechanical advantage of an inclined plane?
by increasing the length of the inclined plane
by decreasing the length of the inclined plane
by increasing the output force of the inclined plane
by decreasing the output force of the inclined plane
- 24. Multiple Choice
What is the mechanical advantage if the radius of the wheel is 49 cm and the radius of the axle is 7 cm?
3
7
16
21
- 25. Multiple Choice
Which of the following is correct?
Decreasing the size of a wheel will double the mechanical advantage.
Decreasing the size of a wheel will increase the mechanical advantage.
Increasing the size of a wheel will increase the mechanical advantage.
Increasing the size of a wheel will decrease the mechanical advantage.
- 26. Multiple Choice
What can a car manufacturer do to increase the mechanical advantage of a steering wheel?
shorten the axle length of the steering wheel
lengthen the axle length of the steering wheel
decrease the radius of the steering wheel
increase the radius of the steering wheel
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