24) The Earth\'s present atmosphere is composed almost entirely of nitrogen, oxy

Question

24) The Earth's present atmosphere is composed almost entirely of nitrogen, oxygen, and water vapor. nitrogen, oxygen, and carbon dioxide. ) oxygen, and carbon dioxide. D) hydrogen, helium, and water Vapor. 25) If any mass is shrunk to the size of the event horizon, that object will be a neutron star B black hole brown dwarf D) white dwarf 26) What are the two things that scientist think defines life. A) Eating and reproduction. B) Eating and breathing C) Growing and enlarging D Reproduction and evolution. 27) Most biological evidence shows that every spices has a separate origin. B) humans have a distinct origin C) all life on Earth has a single origin. D) all life on Earth comes from Mars 28) The modern theory that explains universe is called A) The Steady State Theory B) The Cosmic Expansion Theory The Big Bang Theory Black Hole evaporation Theory 29) The discovery that the universe is expanding came a quit a shock. Until Hubble discovered the Cosmological Red Shift the universe was thought to be Infinitely old and Infinite in extent. What discovery by Wilson and Penzias forced most Astronomers to acce that the Big Bang Theory was correct? A Discovery of the Cosmic Background Radiation. B) Discovery that the speed of light is a constant. C) Discovery of Black Holes. 30) A first magnitude star is A) the same brightness as a 6th magnitude star. B) dimmer than a 6th magnitude star. righter than a 6th magnitude star. D) is brighter than the Sun.

Explanation / Answer

24.the answer should be C.because water vapour is 1 to 4% by volume while the CO2 is 0.03%by volume..and O is 21% and nitrogen is 78%.so the answer is C..

25.B.

Explanation..yes it will be called black hole ,it is right.

26.D..

Reproduction and Evolution are the two things which define life..

27.A..but not sure about it

28.C

Because the Big Bang theory describes about the formation of the universe from single point source.

29.A

Wilson and Penjias together discovered the cosmic background radiation theory which supported Big Bang Theory.

30.C

A first magnitude was given to 20 stars while 6th magnitude was given to the faintest star.So 1st magnitude star is brighter than sixth magnitude star.

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