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Science Test
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Get to know the forces of nature. 
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Question 1 of 10
1. Question
1 pointsWhich of the following is designed to convert energy into mechanical work?
Correct 1 / 1 PointsAn electric fan converts energy into mechanical work.
Incorrect / 1 PointsAn electric fan converts energy into mechanical work.
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Question 2 of 10
2. Question
1 pointsWhich of the following best explains why the pressure inside a high-flying airplane must be controlled?
Correct 1 / 1 PointsAt high altitudes there is lower atmospheric pressure than on the surface of the Earth.
Incorrect / 1 PointsAt high altitudes there is lower atmospheric pressure than on the surface of the Earth.
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Question 3 of 10
3. Question
1 pointsTo keep a box sliding across a floor at a constant speed, a person must continually exert a force on the box. This force is used primarily to overcome which of the following?
Correct 1 / 1 PointsThe frictional force exerted by the floor on the box.
Incorrect / 1 PointsThe frictional force exerted by the floor on the box.
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Question 4 of 10
4. Question
1 pointsAs observed with special instruments from Earth, the Sun appears to be slightly larger in January than in July. Why?
Correct 1 / 1 PointsThe Earth moves in an orbit that is not circular but is closer to the Sun in January than in July.
Incorrect / 1 PointsThe Earth moves in an orbit that is not circular but is closer to the Sun in January than in July.
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Question 5 of 10
5. Question
1 pointsThe equation "X -> Y + Z + energy" represents a nuclear decay, in which nucleus X decays into particle Y and nucleus Z. Why is energy released in the decay?
Correct 1 / 1 PointsThe mass of X is greater than the sum of the masses of Y and Z.
Incorrect / 1 PointsThe mass of X is greater than the sum of the masses of Y and Z.
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Question 6 of 10
6. Question
1 points10-liters of CO2 gas contains the same number of molecules as how many liters of O2 gas at the same temperature and pressure?
Correct 1 / 1 Points10 liters.
Incorrect / 1 Points10 liters.
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Question 7 of 10
7. Question
1 pointsWhat property of water is most important for living organisms?
Correct 1 / 1 PointsIt is liquid at most temperatures on Earth.
Incorrect / 1 PointsIt is liquid at most temperatures on Earth.
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Question 8 of 10
8. Question
1 pointsThe Earths Moon is:
Correct 1 / 1 PointsAlways much closer to the Earth than it is to the Sun.
Incorrect / 1 PointsAlways much closer to the Earth than it is to the Sun.
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Question 9 of 10
9. Question
1 pointsBeryl finds a rock and wants to know what kind it is. Which piece of information about the rock will best help her to identify it?
Correct 1 / 1 PointsThe minerals the rock contains.
Incorrect / 1 PointsThe minerals the rock contains.
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Question 10 of 10
10. Question
1 pointsAir in the atmosphere continuously moves by convection. At the equator, air rises; at the poles, it sinks. This occurs because:
Correct 1 / 1 PointsWarm air is less dense than cold air.
Incorrect / 1 PointsWarm air is less dense than cold air.
