Science Quiz Questions For Grade 11 And 12
Are you ready to test your knowledge with a challenging science quiz? The Science Quiz Questions for Grade 11 and 12 cover key topics in physics, chemistry, and biology. The questions will assess your understanding of scientific principles, formulas, and real-world applications.
If you are preparing for an exam then this quiz will help you improve your problem-solving skills. Each question comes with four options, and the correct answers are provided to enhance your learning experience. This science quiz questions for class 11 and 12 with answers will cover various topics such as motion, chemical reactions, cell biology, and Read moreenvironmental science.
Science Quiz For Grade 11 and 12 Questions and Answers
- 1.
Why does a person sitting in a moving bus suddenly move forward when the bus suddenly stops?
- A.
Due to inertia
- B.
Due to brakes
- C.
Due to negative acceleration
- D.
Due to the force exerted by the machine
Correct Answer
A. Due to inertiaExplanation
Jacobson's organs, also known as the vomeronasal organs, are two pits located on the palate of a snake. These specialized sensory organs are used to detect pheromones and other chemical signals in the environment. When a snake flicks its tongue, it picks up scent particles and transfers them to Jacobson's organs for analysis. This allows the snake to track prey, find mates, and navigate its surroundings more effectively. The ability to detect chemical cues is crucial for a snake's survival, making Jacobson's organs an essential part of its sensory system.Rate this question:
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- 2.
What kind of energy does a person sitting in a moving car have?
- A.
Kinetic energy
- B.
Potential energy
- C.
Both kinetic and potential energy
- D.
Elastic potential energy
Correct Answer
C. Both kinetic and potential energyExplanation
A person sitting in a moving car has both kinetic and potential energy. Kinetic energy is the energy of motion, so as the car moves, the person also moves, giving them kinetic energy. Potential energy is the energy stored due to an object's position or state. If the car is at a certain height, such as on a hill, the person has gravitational potential energy due to their position relative to the ground. Therefore, while moving, the person possesses both kinetic energy from the car's motion and potential energy from their position within the gravitational field.Rate this question:
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- 3.
Why does mud fly off a stick when you swing it toward another object?
- A.
Due to friction
- B.
Due to inertia
- C.
Due to the force of the stick
- D.
Both A and B
Correct Answer
B. Due to inertiaExplanation
Mud flies off a stick when you swing it into another object due to inertia. Inertia is the property of matter that keeps an object at rest or in uniform motion unless acted upon by an external force. When you swing the stick, both the stick and the mud are moving together. However, when the stick suddenly changes direction or stops upon hitting another object, the mud tends to continue moving in its original direction due to inertia. This causes the mud to fly off the stick. This principle is an example of Newton's First Law of Motion.Rate this question:
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- 4.
Why are transition elements named so?
- A.
Variable valency
- B.
Having different colors
- C.
Constant valency
- D.
Both A and B
Correct Answer
D. Both A and BExplanation
Transition elements are given that name because they exhibit variable valency and often have different colors. Variable valency means that these elements can form ions with different charges, due to the involvement of d-orbitals in bonding. This characteristic leads to a variety of oxidation states. Additionally, many transition elements and their compounds display a range of colors, which is due to the d-d electron transitions when they absorb visible light. These properties are distinct and significant, making the name "transition elements" particularly appropriate for this group in the periodic table.Rate this question:
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- 5.
Why is it challenging to prepare a supersaturated solution?
- A.
Because it requires careful temperature control.
- B.
Solute particles cant be homogenized
- C.
Constant heat pressure
- D.
Oxygen in air
Correct Answer
A. Because it requires careful temperature control.Explanation
Creating a supersaturated solution is challenging because it involves dissolving more solute than normally possible at room temperature. This requires heating the solution to dissolve excess solute, then carefully cooling it without disturbing it, to avoid crystallization. Maintaining this delicate balance in temperature and stability makes preparing supersaturated solutions particularly difficult.Rate this question:
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- 6.
Is electrolysis the same as ionization? If not, why?
- A.
Yes!
- B.
No, electrolysis relies on ionization but is distinct
- C.
Matter splits up into its ions.
- D.
None of these
Correct Answer
B. No, electrolysis relies on ionization but is distinctExplanation
Electrolysis and ionization are related processes but are not identical. Electrolysis uses an electric current to drive a chemical reaction, causing compounds to split into ions, which is essential for the reaction. Ionization, on the other hand, is the process of forming ions, which can happen through various means, not just electrolysis. In electrolysis, ionization occurs as part of the reaction when ions move towards the electrodes. Thus, while ionization is necessary for electrolysis, they represent distinct processes, with ionization being one aspect of the broader electrolytic process.Rate this question:
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- 7.
Why does hitting the ball with the center of the bat produce a more effective shot?
- A.
Fx + fy= o
- B.
The center of gravity remained within its base.
- C.
It produces more torque.
- D.
Both A and B
Correct Answer
B. The center of gravity remained within its base.Explanation
When hitting a ball with the bat’s center (or "sweet spot"), the center of gravity remains within the bat's base, reducing vibration and maximizing energy transfer. This results in a powerful, controlled shot, as energy is efficiently transferred from the bat to the ball. Maintaining the center of gravity within the base is key for balance and achieving the best shot in sports like cricket and baseball.Rate this question:
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- 8.
What kind of quantity is work?
- A.
Scalar Quantity
- B.
Vector Quantity
- C.
Complex Quantity
- D.
None of these
Correct Answer
A. Scalar QuantityExplanation
Work is a scalar quantity, which means it only has magnitude and no direction. In physics, work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. Since it does not involve direction, it is considered a scalar quantity. Unlike vector quantities, which have both magnitude and direction, scalar quantities like work are described by a single numerical value. This distinction is important in understanding the fundamental concepts of physics and how different physical quantities are measured and analyzed.Rate this question:
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- 9.
What are Jacobson's organs?
- A.
Two pits present on the palate of the snake
- B.
Nostrils
- C.
Organs present in the note
- D.
Trachea
Correct Answer
A. Two pits present on the palate of the snakeExplanation
Jacobson's organs, also known as the vomeronasal organs, are two pits located on the palate of a snake. These specialized sensory organs are used to detect pheromones and other chemical signals in the environment. When a snake flicks its tongue, it picks up scent particles and transfers them to Jacobson's organs for analysis. This allows the snake to track prey, find mates, and navigate its surroundings more effectively. The ability to detect chemical cues is crucial for a snake's survival, making Jacobson's organs an essential part of its sensory system.Rate this question:
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- 10.
What is each rank of biological classification called?
- A.
Taxon
- B.
Evolutionary taxonomy
- C.
Homology
- D.
None of these
Correct Answer
A. TaxonExplanation
Each rank of biological classification is called a "taxon" (plural: taxa). In taxonomy, a taxon refers to a group of one or more organisms that are categorized based on shared characteristics. These ranks are organized hierarchically, ranging from broad categories like domain and kingdom to more specific levels like genus and species. This classification system allows scientists to study organisms’ evolutionary relationships and categorize them in an organized way. Understanding taxonomic ranks is fundamental in biology, helping us to recognize how living organisms are related and distinct from one another.Rate this question:
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- 11.
In an exothermic reaction, is the enthalpy of products higher or lower?
- A.
Lower
- B.
Higher
- C.
Sometimes lower and sometimes higher
- D.
Equal
Correct Answer
A. LowerExplanation
In an exothermic reaction, the enthalpy of the products is lower than that of the reactants. This is because exothermic reactions release energy, usually in the form of heat, to the surroundings. The loss of energy results in a decrease in the enthalpy (heat content) of the products compared to the reactants. This energy release is what makes exothermic reactions feel hot, as the system releases heat into its environment. Understanding this concept is crucial in thermodynamics and helps explain why certain reactions occur spontaneously and how energy is conserved in chemical processes.Rate this question:
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- 12.
On what principle does a cream separator work?
- A.
Centrifugal Force
- B.
Centripetal Force
- C.
Gravitational Force
- D.
Electromagnetic Force
Correct Answer
A. Centrifugal ForceExplanation
A cream separator works on the principle of centrifugal force. When the separator spins, the centrifugal force pushes the denser milk outward while the lighter cream collects in the center. This separation occurs because centrifugal force acts on the different densities of the milk and cream, causing them to move to different areas within the spinning container. This process efficiently separates the cream from the milk, allowing for the collection of cream for further processing or consumption. Understanding the role of centrifugal force is key in many applications, including industrial and scientific processes.Rate this question:
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- 13.
What happens to the boiling point of water at higher altitudes compared to sea level?
- A.
Increases
- B.
Decreases
- C.
Remains the same
- D.
Boils at room temperature
Correct Answer
B. DecreasesExplanation
At higher altitudes, the atmospheric pressure is lower than at sea level. The boiling point of water is the temperature at which its vapor pressure equals the surrounding atmospheric pressure. Since the atmospheric pressure decreases with altitude, the water needs less energy to reach a pressure equal to the surrounding air. This results in a lower boiling point, meaning water boils at a lower temperature than it does at sea level. This relationship is a direct application of the principles of pressure and vapor pressure, which are essential in understanding thermodynamic behavior in varying atmospheric conditions.Rate this question:
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- 14.
Which particle is negatively charged and orbits the nucleus of an atom?
- A.
Proton
- B.
Neutron
- C.
Electron
- D.
Positron
Correct Answer
C. ElectronExplanation
The electron is a subatomic particle with a negative charge and is found in the electron cloud orbiting the nucleus of an atom. Unlike protons and neutrons, which are located in the nucleus, electrons are distributed in energy levels around it, and their arrangement follows specific quantum rules. This negative charge is balanced by the positive charge of protons in a neutral atom. The electron’s movement and distribution define an atom's chemical properties, as it is involved in forming bonds with other atoms. Understanding electron behavior is fundamental in atomic theory and molecular bonding.Rate this question:
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- 15.
Which type of bond involves the sharing of electrons between atoms?
- A.
Ionic bond
- B.
Covalent bond
- C.
Metallic bond
- D.
Hydrogen bond
Correct Answer
B. Covalent bondExplanation
A covalent bond forms when atoms share pairs of electrons to achieve stability, typically following the octet rule. Unlike ionic bonds, where electrons are transferred between atoms, covalent bonds involve shared electrons, creating a balance between attractive and repulsive forces. The number of shared electron pairs can vary, forming single, double, or triple bonds. This bond type is common in organic compounds, where molecules are stabilized by these shared interactions. Covalent bonds require energy to form or break, which is calculated based on bond enthalpies, making them essential in thermodynamic and molecular structure calculations.Rate this question:
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- 16.
Which fundamental force is responsible for the radioactive decay of unstable atomic nuclei?
- A.
Strong nuclear force
- B.
Weak nuclear force
- C.
Electromagnetic force
- D.
Gravitational force
Correct Answer
B. Weak nuclear forceExplanation
The weak nuclear force is responsible for radioactive decay, particularly beta decay, where a neutron transforms into a proton while emitting an electron and an antineutrino. Unlike the strong nuclear force, which binds protons and neutrons in the nucleus, the weak nuclear force acts at a subatomic level, enabling particle transformations. Its range is extremely short, around 10⁻¹⁸ meters, making it weaker than the electromagnetic and strong nuclear forces. This force plays a crucial role in nuclear reactions inside stars, including the Sun, where hydrogen fuses into helium through weak interactions, producing the energy that powers stellar processes.Rate this question:
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- 17.
In organic chemistry, what type of isomerism is exhibited by molecules that differ in spatial arrangement due to restricted rotation around a double bond?
- A.
Structural isomerism
- B.
Optical isomerism
- C.
Geometrical isomerism
- D.
Conformational isomerism
Correct Answer
C. Geometrical isomerismExplanation
Geometrical isomerism occurs due to restricted rotation around a double bond or in ring structures, leading to different spatial arrangements of atoms. In alkenes, for instance, cis-isomers have similar groups on the same side of the double bond, while trans-isomers have them on opposite sides. This difference influences properties like boiling points and dipole moments. Since free rotation is hindered by the presence of the double bond’s pi-electron cloud, breaking it requires significant energy. Such isomers play a crucial role in biological molecules, including vision-related compounds like retinal, which changes configuration upon light absorption.Rate this question:
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- 18.
What is the primary function of the enzyme DNA ligase during DNA replication?
- A.
Unwinds the DNA helix
- B.
Joins Okazaki fragments
- C.
Synthesizes new DNA strands
- D.
Proofreads the DNA sequence
Correct Answer
B. Joins Okazaki fragmentsExplanation
DNA ligase plays a key role in DNA replication, particularly in the lagging strand, where it joins Okazaki fragments. The replication process is discontinuous on this strand due to the 5' to 3' synthesis direction. DNA ligase catalyzes the formation of phosphodiester bonds between adjacent fragments, sealing gaps in the sugar-phosphate backbone. This enzyme requires ATP or NAD⁺ to facilitate the bonding process. Without DNA ligase, replication would leave fragmented DNA, leading to genetic instability. Its function is also crucial in DNA repair mechanisms, such as fixing nicks in the DNA strand caused by damage or replication errors.Rate this question:
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- 19.
Which law explains why a satellite remains in orbit around Earth without falling back to the surface?
- A.
Kepler’s Third Law
- B.
Newton’s First Law
- C.
Einstein’s Equivalence Principle
- D.
Bernoulli’s Principle
Correct Answer
B. Newton’s First LawExplanation
Newton’s First Law, also called the Law of Inertia, states that an object remains in uniform motion unless acted upon by an external force. A satellite in orbit moves due to a balance between its inertia and Earth's gravitational pull. The satellite continuously falls toward Earth, but its tangential velocity prevents it from hitting the surface, creating stable orbiting motion. The gravitational force acts as the centripetal force, keeping the satellite on its path. If the satellite’s speed decreases, it falls into a lower orbit; if it increases, it may escape Earth's gravity and enter deep space.Rate this question:
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- 20.
In thermodynamics, what happens to the entropy of an isolated system over time according to the Second Law of Thermodynamics?
- A.
Always increases
- B.
Always decreases
- C.
Remains constant
- D.
Fluctuates randomly
Correct Answer
A. Always increasesExplanation
The Second Law of Thermodynamics states that the entropy of an isolated system always increases over time. Entropy, a measure of disorder, tends to rise as energy disperses and systems become more random. This law explains why natural processes like heat transfer occur spontaneously in one direction—hot to cold—until equilibrium is reached. In a closed system, energy transformations always lead to increased disorder, as seen in the decay of biological systems or the expansion of gases. Even in highly ordered living organisms, entropy increases overall, with energy from food helping maintain internal organization while increasing entropy in the surroundings.Rate this question:
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Feb 13, 2025Quiz Edited by
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Feb 16, 2008Quiz Created by
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