An air bubble rises in water because a) Things underwater do not experience the

Question

An air bubble rises in water because a) Things underwater do not experience the gravitational force b) Air itself does not experience the gravitational force c) The buoyancy force acting on the air is greater than the weight of the air d) The air that is underwater is attracted to all of the air that is in the atmosphere above The blood has to flow faster through a partially blocked blood vessel, which can cause the blood pressure to decrease and the blood vessel to collapse. This is an example of a) Archimede's Principle b) Pascal's Principle c) Bernoulli's Principle d) Newton's Principle Temperature is a measure of a) The average momentum of molecules b) The average velocity of molecules c) The average kinetic energy of molecules d) The total kinetic energy of molecules According to the second law of thermodynamics a) heat never spontaneously flows from a cold substance to a hot substance b) entropy always decreases in an isolated system c) Heat added - increase in thermal energy + external work done by system d) No system can reach absolute zero Which statement is correct? a) Protons have positive charge and electrons have no charge b) Protons have negative charge and electrons have positive charge c) Protons have positive charge and electrons have negative charge d) Protons have no charge and electrons have negative charge A battery is analogous to a) giving potential energy to water by carrying it in buckets up a hill b) water flowing downhill in a stream c) rocks partially blocking the flow of water in a stream d) all of the above A closed circuit is made by connecting a 5 Volt battery to a 10 Ohm resistor. How much current flows around this circuit? a) 2 Amperes b) 0.5 Amperes c) 50 Amperes d) 15 Amperes We have no evidence for the existence of the following: a) Electric charges b) Processes in which mass is converted into energy c) Magnetic monopoles d) Black holes A magnetic field is produced by a) magnetic monopoles b) electric current c) static electric charges d) pure evil

Explanation / Answer

Answer

18) Air bubble rises in water because, the bouyant force acting upward on the bubble is greater than the weight of the air bubble. ( option c is correct)

19) if cross section area of blood vessels decreases than velocity of blood increases and pressure decreases. This is an example of Bernoulli's principle. (option c is correct)

20)Temperature is a measure of the average kinetic energy of the particles of a substance. The higher the temperature of an object, the higher is its kinetic energy. Kinetic energy is a type of energy associated with motion. ( option c is correct)

21) According to second law of thermodynamics heat never flows spontaneously from cold substance to a hot substance. ( option a is correct)

22) option c is correct

23) Battery is an energy storage device. ( option d is correct)

24) Current I=V/R = 5/10= 0.5 A ( option b is correct)

25) magnetic monopole does not exist. ( option c is correct)

26) flow of electric current produces magnetic field. ( option b is correct)

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