General Knowledge On Science Quiz For Grade 6

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  • 1/19 Questions

    Which planet is the biggest?

    • Saturn
    • Uranus
    • Jupiter
    • Mars
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About This Quiz

Are you ready to test your brainpower with a fun and exciting science quiz for grade 6? This quiz is designed to engage young minds with a variety of general knowledge questions related to science. It provides a fun and educational way for grade 6 students to test their knowledge and learn new facts while having fun.

The science quiz for class 6 with answers offers a valuable resource for teachers and parents to guide their young learners. It allows for self-assessment and helps in identifying areas where students may need more practice. The answers provided with the quiz offer clear and detailed explanations, making it easier for students to grasp complex concepts.

General Knowledge On Science Quiz For Grade 6 - Quiz

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  • 2. 

    What is the main source of energy for the Earth's climate system?

    • The Sun

    • The Moon

    • The Earth's Core

    • The Ocean

    Correct Answer
    A. The Sun
    Explanation
    The Sun is the main source of energy for the Earth's climate system. Solar energy drives atmospheric circulation, ocean currents, and weather patterns. It is absorbed by the Earth's surface and atmosphere, warming the planet and powering the water cycle. This energy is also essential for photosynthesis, which supports life on Earth. The balance between incoming solar radiation and outgoing terrestrial radiation determines the Earth's climate and temperature.

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  • 3. 

    Which planet is known as the Red Planet?

    • Mars

    • Venus

    • Jupiter

    • Saturn

    Correct Answer
    A. Mars
    Explanation
    Mars is known as the Red Planet due to its reddish appearance, which is caused by iron oxide (rust) on its surface. Mars is the fourth planet from the Sun and is characterized by its thin atmosphere, cold climate, and polar ice caps. The reddish color can be observed even from Earth with the naked eye. The study of Mars has been a significant focus for scientists, with numerous missions sent to explore its surface and atmosphere, looking for signs of past or present life.

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  • 4. 

    Which river is the world's longest? 

    • Nile

    • Amazon

    • Mississippi

    • River Thames

    Correct Answer
    A. Nile
    Explanation
    The Nile River is the longest river in the world. It flows through northeastern Africa, primarily through Egypt and Sudan. The Nile is famous for its role in ancient Egyptian civilization, providing water for agriculture and transportation. It stretches over 6,650 kilometers (4,130 miles) in length. The river begins in the East African Rift and flows northward into the Mediterranean Sea. Its length surpasses other major rivers like the Amazon in South America, the Mississippi in North America, and the River Thames in England, making it the longest river globally.

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  • 5. 

    Which of these animals has teeth outside its mouth too?

    • Tiger

    • Deer

    • Snake

    • Elephant

    Correct Answer
    A. Elephant
    Explanation
    Elephants have teeth outside their mouths too, which are known as tusks. These elongated incisor teeth grow continuously throughout an elephant's life and can protrude several feet from their mouths. Tusks serve various purposes, including digging, lifting objects, and defense. They are made of ivory, a valuable material that unfortunately leads to illegal poaching and endangerment of elephants.

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  • 6. 

    What is the largest ocean in the world?

    • Arctic Ocean

    • Indian Ocean

    • Pacific Ocean

    • Atlantic Ocean

    Correct Answer
    A. Pacific Ocean
    Explanation
    The Pacific Ocean is the largest ocean in the world, covering more than 63 million square miles (165 million square kilometers). It stretches from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia on the west and the Americas on the east. The Pacific Ocean is not only the largest but also the deepest ocean, containing the Mariana Trench, the deepest point on Earth. Its vast size and depth play a crucial role in global climate, marine biodiversity, and Earth's water cycle.

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  • 7. 

    Which planet is the smallest?

    • Jupiter

    • Neptune 

    • Earth

    • Mercury

    Correct Answer
    A. Mercury
    Explanation
    Mercury is the smallest planet in our solar system. It has a diameter of about 4,880 kilometers, making it slightly larger than Earth's Moon. Despite its small size, Mercury has a significant gravitational pull and a heavily cratered surface, similar to the Moon. Its proximity to the Sun results in extreme temperature variations, with scorching heat during the day and freezing cold at night. Mercury's small size and unique characteristics make it an intriguing planet for scientists studying the solar system's formation and evolution.

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  • 8. 

    What is the most abundant gas in the Earth's atmosphere?

    • Nitrogen

    • Oxygen

    • Carbon Dioxide

    • Hydrogen

    Correct Answer
    A. Nitrogen
    Explanation
    Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the second most abundant gas, constituting about 21% of the atmosphere. Nitrogen is a colorless, odorless, and tasteless gas that is essential for the synthesis of amino acids, proteins, and nucleic acids in living organisms. It plays a crucial role in the nitrogen cycle, where it is converted into various chemical forms that are used by plants and other organisms for growth and development.

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  • 9. 

    What is the largest organ in the human body?

    • Liver

    • Brain

    • Skin

    • Lungs

    Correct Answer
    A. Skin
    Explanation
    The skin is the largest organ in the human body. It serves as a protective barrier against external factors such as bacteria, chemicals, and temperature changes. The skin also plays a crucial role in regulating body temperature, sensing touch, and producing vitamin D through exposure to sunlight. It consists of three main layers: the epidermis (outer layer), dermis (middle layer), and hypodermis (inner layer). The skin's extensive surface area and multiple functions make it a vital component of the body's overall health and well-being.

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  • 10. 

    What is the hardest natural substance on Earth?

    • Diamond

    • Gold

    • Iron

    • Quartz

    Correct Answer
    A. Diamond
    Explanation
    Diamond is the hardest natural substance on Earth. It is composed of carbon atoms arranged in a crystal lattice structure, which gives it exceptional hardness and makes it resistant to scratching. Diamonds are formed under high-pressure, high-temperature conditions deep within the Earth's mantle. Their unique properties make them valuable for various industrial applications, including cutting, grinding, and drilling, as well as for use in jewelry due to their brilliance and durability.

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  • 11. 

    In which ocean is the Mariana Trench (deepest location on Earth)?

    • Atlantic ocean

    • Indian ocean

    • Pacific ocean

    • None of these

    Correct Answer
    A. Pacific ocean
    Explanation
    The Mariana Trench, the deepest location on Earth, is located in the Pacific Ocean. It reaches a maximum known depth of about 36,070 feet (10,994 meters) at a point known as the Challenger Deep. The trench is situated east of the Mariana Islands and is a significant site for scientific exploration and study. Its extreme depths present unique conditions that challenge our understanding of marine biology, geology, and the limits of life on Earth. The Mariana Trench is a focal point for deep-sea research due to its mysterious and largely unexplored environment.

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  • 12. 

    Which of these is an amphibian?

    • Frog

    • Crocodile

    • Lion

    • Human

    Correct Answer
    A. Frog
    Explanation
    The correct answer is Frog because frogs are amphibians. Amphibians are cold-blooded vertebrates that typically have a moist, glandular skin, lay eggs in water, and undergo a metamorphosis from a juvenile aquatic stage to an adult terrestrial stage. Frogs have adaptations that allow them to live both in water and on land, such as their ability to breathe through their skin and their unique life cycle that involves a tadpole stage in water and an adult stage on land.

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  • 13. 

    Which planet is also known as the morning and evening star?

    • Venus

    • Mars

    • Mercury

    • Jupiter

    Correct Answer
    A. Venus
    Explanation
    Venus is known as both the morning star and the evening star because it is one of the brightest objects in the sky and can be seen shining brightly just before sunrise and just after sunset. This visibility occurs due to Venus's orbit being closer to the Sun than Earth's orbit, making it appear near the Sun in the sky. Its bright, reflective cloud cover contributes to its prominent visibility during these times, earning it the names morning star and evening star.

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  • 14. 

    What is the most abundant gas in the Earth's atmosphere?

    • Oxygen

    • Carbon Dioxide

    • Nitrogen

    • Argon

    Correct Answer
    A. Nitrogen
    Explanation
    Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of the air we breathe. Oxygen is the second most abundant, accounting for about 21%, while argon and carbon dioxide make up much smaller percentages. Nitrogen is essential for life, playing a critical role in the biosphere and as a key component of amino acids and proteins. It is also a crucial element in the nitrogen cycle, which helps plants and animals obtain the nitrogen they need to survive. Nitrogen gas is inert and non-reactive, making it a stable component of our atmosphere. 

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  • 15. 

    Which is a sphere of the land on Earth?

    • Stratosphere

    • Lithosphere

    • Mesosphere

    • None of the above

    Correct Answer
    A. Lithosphere
    Explanation
    The lithosphere is the sphere of the land on Earth. It comprises the Earth's crust and the uppermost part of the mantle, forming the solid, outer layer of the planet. The lithosphere is divided into tectonic plates, which float on the semi-fluid asthenosphere beneath them. This layer includes all the landforms, such as mountains, valleys, and plains, and is crucial for supporting terrestrial life. The other terms, stratosphere and mesosphere, refer to layers of the Earth's atmosphere, not the land. Understanding the lithosphere helps in studying geology, tectonics, and Earth's physical features.

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  • 16. 

    How long does it take for Jupiter to move around the sun?

    • About 6 Earth years.

    • About 12 Earth years.

    • About 4 Earth years.

    • About 8 Earth Years.

    Correct Answer
    A. About 12 Earth years.
    Explanation
    Jupiter takes about 12 Earth years to complete one orbit around the Sun. This lengthy orbital period is due to its significant distance from the Sun, approximately 778 million kilometers (484 million miles) away. Jupiter's slow journey around the Sun is influenced by its massive size and strong gravitational field, which also affects the orbits of nearby objects, including some asteroids. Understanding Jupiter's orbital period helps astronomers study the dynamics of our solar system and the gravitational interactions between celestial bodies.

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  • 17. 

    What time will it be in New York if it is 12 noon at Greenwich?

    • 10: 00 pm

    • 8: 00 am

    • 7: 00 am

    • 11: 00 am

    Correct Answer
    A. 7: 00 am
    Explanation
    If it is 12 noon at Greenwich (Greenwich Mean Time, GMT), the time in New York (Eastern Standard Time, EST) would be 7:04 am. New York is typically 5 hours behind Greenwich Mean Time. This time difference can vary during Daylight Saving Time when clocks are set forward by one hour, making the difference 4 hours instead. Understanding time zones is crucial for coordinating activities and communication across different regions of the world.

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  • 18. 

    What is the boiling point of water at sea level?

    • 90°C

    • 100°C

    • 110°C

    • 120°C

    Correct Answer
    A. 90°C
    Explanation
    The boiling point of water at sea level is 100°C (212°F). At this temperature, water molecules gain enough energy to change from a liquid to a gaseous state, forming water vapor. The boiling point can vary with changes in atmospheric pressure. At higher altitudes, where the atmospheric pressure is lower, water boils at a lower temperature. Conversely, at higher pressures, such as in a pressure cooker, water boils at a higher temperature. Understanding the boiling point of water is essential for various scientific and culinary applications.

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  • 19. 

    Which part of the plant conducts photosynthesis?

    • Roots

    • Stem

    • Leaves

    • Flowers

    Correct Answer
    A. Roots
    Explanation
    Leaves are the primary site of photosynthesis in most plants. They contain chlorophyll, a green pigment that captures light energy from the sun. During photosynthesis, leaves take in carbon dioxide from the air and water from the soil to produce glucose and oxygen. The process takes place in the chloroplasts within the leaf cells. The glucose serves as an energy source for the plant, while the oxygen is released into the atmosphere. The broad, flat surface of leaves provides a large area for light absorption, making them highly efficient at capturing sunlight.

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  • Current Version
  • Mar 03, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 26, 2010
    Quiz Created by
    Nee123
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