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Our Universe - 1 Class 3 Worksheet SST
Q1: Multiple Choice Questions (MCQs)
1. What is the name of our galaxy?
a) Andromeda
b) Milky Way
c) Solar System
d) Universe
Ans: b) Milky Way
2. Which planet is known as the "Red Planet"?
a) Earth
b) Jupiter
c) Mars
d) Saturn
Ans: c) Mars
3. What is the largest planet in our solar system?
a) Mercury
b) Jupiter
c) Venus
d) Neptune
Ans: b) Jupiter
4. What causes day and night on Earth?
a) The revolution of the Earth
b) The rotation of the Earth
c) The movement of the Moon
d) The heat from the Sun
Ans: b) The rotation of the Earth
5. How many planets are there in our solar system?
a) Seven
b) Eight
c) Nine
d) Ten
Ans: b) Eight
Q2: Match the following
Ans: 
Q3: True or False
1. The universe is small and has only a few stars.
Ans: False
The universe is huge and endless. It has billions of stars, planets, and galaxies.
2. The Earth is the only planet in the solar system that has life.
Ans: True
3. The Sun is bigger than all the planets in the solar system.
Ans: True
4. There are ten planets in the solar system.
Ans: False
There are eight planets in the solar system. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
5. The Earth takes 365 days to complete one revolution around the Sun.
Ans: True
Q4: Answer the following Questions
1. What is the universe?
Ans: The universe is everything around us, including stars, planets, galaxies, and all matter and energy.
2. Why is Earth special?
Ans: Earth is special because it is the only planet known to have life.
3. What is a galaxy?
Ans: A galaxy is a large group of stars, dust, and gas held together by gravity.
4. How does the Earth move around the Sun?
Ans: The Earth moves around the Sun in a fixed path called an orbit, taking 365 days to complete one full revolution.
5. What is the function of the Sun?
Ans: The Sun provides light and heat, making life possible on Earth.
Q5: Imagine and Write
If you could visit any planet in our solar system, which one would you choose and why? Write 3-4 sentences.
Ans: I would like to visit Mars because it is called the Red Planet and looks very different from Earth. Scientists are trying to find out if life ever existed on Mars, and I would love to explore it. I want to see its big mountains, dusty land, and huge craters. It would be fun to jump and walk on Mars in a space suit like an astronaut!
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FAQs on Our Universe - 1 Class 3 Worksheet SST
| 1. What is the Big Bang theory? |  |
Ans. The Big Bang theory is a scientific explanation for the origin and evolution of the universe. It suggests that the universe began as a singularity, a point of infinite density and temperature, about 13.8 billion years ago. It then rapidly expanded and continues to expand, causing the universe to become larger and cooler over time.
| 2. How was the age of the universe determined? | |
Ans. The age of the universe is determined through various methods, including the measurement of the cosmic microwave background radiation (CMB). Scientists analyze the fluctuations in the CMB to calculate the age of the universe. Other methods, such as the observation of distant supernovae and the measurement of the composition of ancient stars, also contribute to determining the age of the universe.
| 3. What is dark matter and why is it important in understanding the universe? | |
Ans. Dark matter is a form of matter that does not interact with light or other forms of electromagnetic radiation, making it invisible to direct observation. However, its presence can be inferred through its gravitational effects on visible matter. Dark matter is important in understanding the universe because it outweighs visible matter by approximately five to one and plays a crucial role in the formation and structure of galaxies and galaxy clusters.
| 4. What is dark energy and how does it affect the expansion of the universe? | |
Ans. Dark energy is a hypothetical form of energy that is believed to be responsible for the accelerated expansion of the universe. It is thought to permeate all of space and counteract the gravitational attraction between matter, causing the expansion of the universe to accelerate. Dark energy is estimated to make up about 68% of the total energy density of the universe.
| 5. What is the significance of cosmic inflation in the early universe? | |
Ans. Cosmic inflation refers to a rapid expansion of the universe that is believed to have occurred in the first fraction of a second after the Big Bang. It is significant because it helps explain certain observed properties of the universe, such as its overall uniformity and the absence of certain relics from the early universe. Cosmic inflation also provides a possible explanation for why the universe appears flat and why distant regions of the universe are so similar.
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