Science Quiz For Grade 9
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Displacement is a ________________ quantity.
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Vector
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Scalar
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Challenge your knowledge and sharpen your skills with this engaging "Science Quiz Class 9" assessment. Designed for students in grade 9, this quiz covers a range of fascinating topics, including biology, physics, chemistry, and beyond. Test your understanding of scientific concepts, theories, and experiments with questions tailored to your curriculum.
If you are looking for a boost to your preparation, then this science quiz for class 9 with answers not only tests your knowledge but also provides detailed explanations for every answer. So, if you want to brush up on formulas or revisit key scientific principles, this quiz ensures a fun and educational experience.
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- 2.
What state of matter is ice found in?
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Solid
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Liquid
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Gas
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Plasma
Correct Answer
A. SolidExplanation
Ice is a solid because it is the frozen form of water. At temperatures below zero degrees Celsius, water molecules slow down and form a rigid, crystalline structure, resulting in the solid state of ice. In this state, the molecules are closely packed together and have a fixed shape and volume.Rate this question:
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- 3.
What is the primary function of red blood cells in the human body?
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Transporting oxygen to body tissues.
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Producing antibodies to fight infections.
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Clotting blood during injuries.
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Protecting the body from harmful UV rays.
Correct Answer
A. Transporting oxygen to body tissues.Explanation
The primary function of red blood cells is to transport oxygen to body tissues. These cells contain hemoglobin, a protein that binds to oxygen molecules in the lungs and delivers them to tissues throughout the body. Hemoglobin also plays a minor role in transporting carbon dioxide back to the lungs for exhalation. Red blood cells are uniquely shaped like biconcave discs, which increases their surface area for oxygen exchange. This function is critical for cellular respiration, which provides energy to body cells. Without adequate oxygen transport, the body's organs and tissues would fail to function effectively.Rate this question:
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- 4.
Distance is a ________________ quantity.
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Scalar
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Vector
Correct Answer
A. ScalarExplanation
Distance is a scalar quantity because it only has magnitude and no directional component. Scalars are quantities that can be completely described by their magnitude alone, such as temperature or mass. In contrast, vectors have both magnitude and direction, like velocity or displacement. Since distance is simply the length between two points, it does not have a specific direction associated with it, making it a scalar quantity.Rate this question:
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- 5.
If a body covers a full circle, then the displacement is:
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1
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0
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Distance
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Not sufficient data
Correct Answer
A. 0Explanation
If a body covers a full circle, it means that it returns to its original position. Displacement refers to the change in position from the initial to the final position. In this case, since the body ends up at the same position where it started, there is no change in position and therefore the displacement is zero.Rate this question:
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- 6.
Speed is a ________________ quantity.
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Vector
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Scaler
Correct Answer
A. ScalerExplanation
Speed is a scalar quantity because it only has magnitude and no direction. Scalar quantities are described by a single value, such as speed, temperature, or mass, without any information about the direction in which they occur. In contrast, vector quantities have both magnitude and direction, like velocity or force. Since speed only represents the magnitude of motion without specifying a direction, it is considered a scalar quantity.Rate this question:
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- 7.
Displacement can be 0.
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True
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False
Correct Answer
A. TrueExplanation
The statement "Displacement = 0" is true because displacement is a vector quantity that measures the change in position of an object from its initial position to its final position. When the displacement is zero, it means that the object has not moved or has returned to its original position.Rate this question:
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- 8.
Which gas is most responsible for the greenhouse effect?
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Carbon dioxide
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Nitrogen
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Oxygen
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Argon
Correct Answer
A. Carbon dioxideExplanation
The gas most responsible for the greenhouse effect is carbon dioxide (CO2). The greenhouse effect occurs when gases in Earth's atmosphere trap heat radiating from the planet's surface. CO2, produced by activities such as burning fossil fuels and deforestation, absorbs infrared radiation and re-emits it, leading to a warming effect. While other gases like methane and nitrous oxide also contribute, CO2 has the most significant impact due to its abundance and long atmospheric lifespan. This process is vital for maintaining Earth's temperature but becomes harmful when intensified by human activities, leading to global warming and climate change.Rate this question:
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- 9.
What is Newton’s third law of motion?
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For every action, there is an equal and opposite reaction.
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The acceleration of an object depends on mass and force.
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An object at rest stays at rest unless acted upon.
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Force is the product of mass and acceleration.
Correct Answer
A. For every action, there is an equal and opposite reaction.Explanation
Newton’s third law of motion states, "For every action, there is an equal and opposite reaction." This means that when an object exerts a force on another object, the second object exerts an equal and opposite force back on the first. For example, when you push against a wall, the wall pushes back with an equal force, even though it doesn't move. This principle explains many phenomena, such as the propulsion of rockets, where exhaust gases exert a downward force, causing the rocket to move upward. This law is fundamental in understanding interactions between objects in physics.Rate this question:
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- 10.
Plasma consists _________ particles.
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Energetic/excited
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Dull
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Tightly packed
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Loosely packed
Correct Answer
A. Energetic/excitedExplanation
Plasma consists of energetic/excited particles. Plasma is the fourth state of matter, in which atoms are ionized, and their electrons are free to move. These free electrons gain energy and become excited, leading to the presence of highly energetic particles in plasma. Plasma is commonly found in stars, lightning, and neon lights. It is a unique state of matter that exhibits both liquid and gas-like properties.Rate this question:
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- 11.
ER helps in detoxification:
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True
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False
Correct Answer
A. TrueExplanation
ER stands for endoplasmic reticulum, which is an organelle found in cells. The endoplasmic reticulum plays a crucial role in detoxification processes within the cell. It is responsible for the synthesis and modification of lipids and proteins, as well as the detoxification and metabolism of drugs and toxins.Rate this question:
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- 12.
Ribosomes make __________.
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Lipids
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Fats
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Proteins
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Starch
Correct Answer
A. ProteinsExplanation
Ribosomes are responsible for protein synthesis. They are small organelles found in cells that read the genetic code from the DNA and use it to assemble amino acids into proteins. Proteins are essential for various cellular functions, including cell structure, enzymes, and signaling molecules.Rate this question:
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- 13.
Golgi apparatus helps in cell division.
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True
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False
Correct Answer
A. FalseExplanation
The Golgi apparatus does not aid in cell division. The Golgi apparatus is primarily involved in the processing, packaging, and distribution of proteins and lipids within the cell. It plays a crucial role in the secretion of these molecules to their appropriate destinations. However, cell division is primarily controlled by other organelles, such as the nucleus, centrosomes, and the spindle apparatus. These organelles are responsible for processes such as DNA replication, chromosome segregation, and cytokinesis, which are essential for cell division.Rate this question:
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- 14.
Which of the following is not a noble gas?
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Neon
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Argon
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Krypton
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Chlorine
Correct Answer
A. ChlorineExplanation
Noble gases are a group of chemical elements with very similar properties; they are all odorless, colorless, monatomic gases with very low chemical reactivity. The noble gases include helium, neon, argon, krypton, xenon, and radon, and they are located in the far right column (Group 18) of the periodic table. Chlorine, on the other hand, is not a noble gas. It is a halogen, which belongs to Group 17 of the periodic table. Chlorine is a highly reactive element, commonly used in the production of disinfectants and plastics. Unlike noble gases, chlorine forms various compounds through its ability to gain an electron, achieving a stable electronic configuration.Rate this question:
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- 15.
Which of the following is the most ductile element?
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Iron
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Copper
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Gold
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Carbon
Correct Answer
A. GoldExplanation
Gold is widely recognized as the most ductile element. Ductility refers to the ability of a material to be stretched into a thin wire without breaking. Gold's remarkable ductility stems from its atomic structure, which allows its atoms to slide past each other easily under stress without losing their cohesive bonds.Rate this question:
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- 16.
SER involves Storage.
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True
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False
Correct Answer
A. FalseExplanation
The Smooth Endoplasmic Reticulum (SER) primarily functions in lipid synthesis, detoxification, and calcium ion storage. While it plays a role in the synthesis and transport of lipids and hormones, it is not primarily involved in storage in the way that storage organelles like vacuoles or vesicles are. Thus, saying that SER involves storage in the general sense is false.Rate this question:
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- 17.
What is the SI unit of electric current?
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Ampere
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Volt
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Ohm
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Joule
Correct Answer
A. AmpereExplanation
The SI unit of electric current is the ampere, often abbreviated as "A." Named after the French scientist André-Marie Ampère, it measures the flow of electric charge per unit time through a conductor. One ampere corresponds to one coulomb of charge passing through a point in one second. It is a fundamental unit in physics and plays a vital role in understanding electrical circuits. Measuring electric current is essential in various applications, from household appliances to industrial machines, and ensures safe and efficient use of electricity.Rate this question:
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- 18.
Which non-metal is the most reactive?
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Fluorine
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Oxygen
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Carbon
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Lead
Correct Answer
A. FluorineExplanation
Fluorine is the most reactive element. It is the most electronegative element, meaning it has a strong tendency to gain electrons from other elements. Fluorine's high reactivity is due to its small atomic size coupled with a high effective nuclear charge, which strongly attracts electrons from other substances.Rate this question:
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- 19.
What is the latent heat of fusion of ice?
Correct Answer
80 cal/gExplanation
The latent heat of fusion of ice is the amount of heat required to change 1 gram of ice at 0°C to 1 gram of water at 0°C without a change in temperature. This value is 80 calories per gram (cal/g). It is a measure of the energy needed to overcome the molecular forces holding the ice together in a solid state.Rate this question:
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Current Version
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Jan 24, 2025Quiz Edited by
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Jun 03, 2012Quiz Created by
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