Engineering Physics Multiple Choice Questions on “Cosmology”.
1. Cosmology is the branch of science concerned with the ____________
a) Formation of Planets
b) Formation of Stars
c) Formation of Universe
d) Formation of Black holes
Answer: c
Clarification: Cosmology is the branch of science which concerns with the creation of universe, from the big band theory, and with the eventual fate of the universe.
2. Evidence that much of the mass of the universe consist of dark energy has come from __________
a) measuring the density of matter in the solar system
b) determining the distance to the Coma cluster
c) determining the distance to quasars
d) observing extremely distant supernovae
Answer: d
Clarification: Supernovae are created when a massive star dies. By observing supernovae, which are at a very large distance, we have got the evidence that universe contains a majority of dark matter.
3. Which of the following is not an implication of Hubble’s law?
a) The universe is expanding
b) We are in the center of the universe
c) The universe had a beginning
d) The universe was once denser than it is now
Answer: b
Clarification: The Hubble states that the universe is expanding. It also implies that the universe had a beginning and that it was once denser than it is now. It does not state anything about the earth being at the center of the universe.
4. The expansion age of the universe is about _________
a) 1 billion years
b) 10 billion years
c) 100 billion years
d) 1000 billion years
Answer: c
Clarification: The universe is always expanding. According to the study, the universe has been expanding for about 10 billion years till now.
5. The rate of expansion of the universe is __________
a) Decelerating
b) Accelerating
c) Constant
d) Zero
Answer: b
Clarification: The universe is dominated by dark energy. Due to this, the rate of the expansion of the universe is accelerating.
6. The cosmic background radiation observed is starlight.
a) True
b) False
Answer: b
Clarification: The cosmic background radiation was produced about a million years after the beginning of the expansion. It is the brightest in the radio part of the spectrum.
7. Leptons and quarks are called the survivors.
a) True
b) False
Answer: a
Clarification: Leptons and quarks are called the survivors because they survived the big bang, which cause the beginning of the universe as we know it, and are still around today.
8. What will happen if the density of the universe is less than the critical density?
a) The Universe will contract
b) The Universe will contract and then rebound
c) The universe will stop expanding
d) The universe will keep expanding forever
Answer: d
Clarification: When the density of the nucleus is less than a certain critical density, the universe will keep expanding forever, like it is right now, till the end of the time.
9. The theory which believes that the universe works like a heart beating in rhythms is _________
a) Oscillating Universe Theory
b) Slowing down theory
c) Big crunch theory
d) Big bang theory
