A narrow tube is placed vertically in a pan of water, and the water rises in the tube to 4 cm above the level of the pan. The surface tension in the liquid is lowered to one-half its original value by the addition of some soap.
What happens to the height of the liquid column in the tube? A) It drops to 2 cm.
B) It drops to 1 cm.
C) It remains at the same height.
D) It drops or rises, but the height cannot be calculated from the information given.
Question 2According to optimistic estimates, the end of habitability of Earth will come about
A) a few hundred thousand years from now
B) a billion years from now
C) 3 to 4 billion years from now
D) 100 million years from now
Question 3The process whereby heat flows by the mass movement of molecules from one place to another is referred to as
A) conduction.
B) convection.
C) radiation.
D) inversion.
E) evaporation.
Question 4Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
A) 16 times faster.
B) at 1/4 the speed.
C) 4 times faster.
D) the same as the hydrogen molecules.
E) at 1/16 the speed.
Quick Reply
