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Our Universe - 1 Class 3 Worksheet SST
Q1: Multiple Choice Questions (MCQs)
Q1: Multiple Choice Questions (MCQs)(a) Mercury
(b) Earth
(c) Venus
(d) None of them
(ii) Many years ago, a huge ball of fire was created. This theory is known as
(a) Big Bang
(b) Solar system
(c) Earthquake
(d) None of these
(iii) What is the name of the earth’s galaxy?
(a) Milky Way
(b) Comets
(c) Orbit
(d) None of them
(iv) What does the Big Bang theory propose about the origin of the universe?
(a) The universe is eternal and unchanging
(b) The universe began with a huge explosion
(c) The universe was created by a powerful deity
(d) The universe is a result of continuous expansion
(v) Which galaxy is the home of our planet Earth and the Solar System?
(a) Andromeda galaxy
(b) Milky Way galaxy
(c) Solaris galaxy
(d) Orion galaxy
Q2: Match the following
Q3: Fill in the blanks
(i) _________ is the fourth nearest planet to the Sun.
(ii) While the planet revolves, it also rotates on its __________.
(iii) The universe contains thousands of ____________.
(iv) We live on the planet _____________.
(v) The Milky Way galaxy contains approximately __________ billion stars.
Q4: True and False
(i) There are billions of galaxies in the universe.
(ii) The earth is the third planet in the solar system.
(iii) The moon is an artificial satellite of the earth.
(iv) Satellites, like the Moon, do not rotate on their respective axes.
(v) The Sun is a planet in our Solar System.
Q5: Answer the following questions
(i) How many stars are there in the earth’s galaxy?
(ii) What is Milky Way?
(iii) Describe the Big Bang theory.
(iv) What do you mean by the solar system?
You can find Worksheets Solutions here: Worksheet Solutions: Our Universe - 1
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FAQs on Our Universe - 1 Class 3 Worksheet SST
| 1. What is the Big Bang theory and how does it explain the origin of our universe? |  |
Ans. The Big Bang theory is a scientific explanation for the origin of our universe. According to this theory, the universe began as a singularity, an extremely hot and dense point, around 13.8 billion years ago. It then rapidly expanded and continues to expand to this day. The theory is supported by various pieces of evidence, such as the observed redshift of distant galaxies and the abundance of light elements in the universe.
| 2. How do scientists study the universe and its origins? | |
Ans. Scientists study the universe and its origins through various methods and technologies. They use telescopes to observe celestial objects and collect data, including light, radio waves, and other forms of radiation. They also analyze the cosmic microwave background radiation, which is the afterglow of the Big Bang, to gain insights into the early stages of the universe. Additionally, scientists conduct experiments and simulations to test and refine theories about the universe's origins.
| 3. What is dark matter and why is it important in our understanding of the universe? | |
Ans. Dark matter is a hypothetical form of matter that does not interact with light or other forms of electromagnetic radiation, making it invisible to our current observational methods. Its existence is inferred from its gravitational effects on visible matter and the structure of the universe. Dark matter is important in our understanding of the universe because it is believed to make up a significant portion of its mass, influencing the formation and evolution of galaxies and large-scale structures.
| 4. What is the fate of our universe according to current scientific theories? | |
Ans. According to current scientific theories, the fate of our universe depends on its overall density and the balance between the expansion caused by dark energy and the gravitational pull of matter. If the density is high enough, the universe will eventually stop expanding and start contracting, leading to a Big Crunch. If the density is low, the universe will continue to expand indefinitely, becoming colder and more dilute over time. Another possibility is the Big Rip, where the expansion accelerates to the point where galaxies, stars, and even atoms are torn apart.
| 5. Are there other universes beyond our own? | |
Ans. The concept of multiple universes, or a multiverse, is a topic of speculation and ongoing scientific research. Some theories, such as the inflationary multiverse theory, suggest that our universe is just one of many bubble-like regions within a larger multiverse. Each of these universes may have different physical laws and properties. However, direct observational evidence for other universes is currently lacking, and the existence of a multiverse remains a subject of debate and investigation in cosmology.
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