Choose the best answer to the following:A rock suspended

If two protons and two neutrons are removed from the nucleus of neon-20, a nucleus of which element remains? (a) Magnesium-22 (b) Magnesium-20 (c) Oxygen-18 (d) Oxygen-16

Choose the BEST answer to each of the following: The nucleus of an electrically neutral iron atom contains 26 protons. The number of electrons this iron atom has is (a) 52. (b) 26. (c) 24. (d) None.

How many electrons are there in the third shell of sodium, Na (atomic number 11)? (a) None (b) One (c) Two (d) Three

Choose the BEST answer to each of the following: The crystals that make up minerals are composed of (a) atoms with a definite geometrical arrangement. (b) molecules that perpetually move. (c) X-ray patterns. (d) 3-dimensional chessboards.

If the volume of an object were to double, with no change in mass, its density would (a) halve. (b) double. (c) be the same. (d) None of these.

According to Hooke’s law, if you hang by a tree branch and note how much it bends, then hanging with twice the weight produces (a) half the bend. (b) the same bend if the branch doesn’t break. (c) twice the bend. (d) 4 times the bend.

Choose the BEST answer to each of the following: When you bend the branch of a tree by hanging on its end, the top side of the branch is under (a) tension. (b) compression. (c) Both. (d) Neither.

Choose the BEST answer to each of the following: Pumice is a volcanic rock that floats in water. The density of pumice compared with that of water is (a) less. (b) equal. (c) greater. (d) none because it sinks.

Choose the BEST answer to each of the following: When you scale up an object to 3 times its linear size, the surface area increases by (a) 3 and the volume by 9. (b) 3 and the volume by 27. (c) 9 and the volume by 27. (d) 4 and the volume by 8.

Choose the BEST answer to each of the following: The pressure at the bottom of a pond does NOT depend on the (a) acceleration due to gravity. (b) water density. (c) depth of the pond. (d) surface area of the pond.

Choose the BEST answer to each of the following: A completely submerged object always displaces its own (a) weight of fluid. (b) volume of fluid. (c) density of fluid. (d) All of these.

Choose the BEST answer to each of the following: A rock suspended by a weighing scale weighs 5 N out of water and 3 N when submerged in water. What is the buoyant force on the rock? (a) 3 N (b) 5 N (c) 8 N (d) None of these.

Choose the BEST answer to each of the following: In a vacuum, an object has no (a) buoyant force. (b) mass. (c) weight. (d) All of these.

Choose the BEST answer to each of the following: Atmospheric pressure is due to the weight (a) of the atmosphere. (b) and volume of the atmosphere. (c) density and volume of the atmosphere. (d) of planet Earth itself.

Consider two mercury barometers, one having a cross-sectional area of \(1 \mathrm{~cm}^{2}\) and the other \(2 \mathrm{~cm}^{2}\) . The height of mercury in the narrower tube is (a) half. (b) twice. (c) the same. (d) None of these.

Choose the BEST answer to each of the following: A barometer that uses water instead of mercury will be (a) shorter. (b) taller. (c) equal in height. (d) inoperable.

When you squeeze an air-filled party balloon, you increase its (a) volume. (b) mass. (c) weight. (d) density.

Choose the BEST answer to each of the following: In a hydraulic press operation, the output piston cannot (a) move farther than the input piston. (b) exceed the force input. (c) exceed the input piston’s speed. (d) produce increased energy.

Choose the BEST answer to each of the following: The flight of a blimp best illustrates (a) Archimedes’ principle. (b) Pascal’s principle. (c) Bernoulli’s principle. (d) Boyle’s law.

Choose the BEST answer to each of the following: When wind speeds up as it blows over the top of a hill, atmospheric pressure there (a) increases. (b) decreases. (c) isn’t affected. (d) reduces to zero.