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Science Class 8

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Science Class 8

Science

1 / 50

Differentiate between a homogeneous and a heterogeneous mixture.

A homogeneous mixture has a uniform composition throughout. A heterogeneous mixture has non-uniform composition.

A homogeneous mixture consists of only one substance. A heterogeneous mixture consists of multiple substances.

A homogeneous mixture has non-uniform composition throughout. A heterogeneous mixture has a uniform composition.

2 / 50

Define motion and rest.

Motion is the change in position of an object with time. Rest is the state of an object when it does not change its position with time.

Motion is the distance traveled by an object, and rest is when an object is stationary.

Motion and rest are the same, and there is no difference between them.

3 / 50

What is the role of meristematic tissue in plants?

Meristematic tissue provides mechanical support to plants.

Meristematic tissue stores nutrients in plants.

Meristematic tissue is responsible for the growth and development of plant organs.

4 / 50

Differentiate between simple and compound tissues in plants.

Simple tissues have only one function, while compound tissues have multiple functions.

Simple tissues consist of one type of cell, while compound tissues consist of more than one type of cell.

Simple tissues are found in animals, while compound tissues are found in plants.

5 / 50

Differentiate between plant cells and animal cells.

Plant cells have a cell wall, chloroplasts, and a large central vacuole, while animal cells lack these structures.

Plant cells have a nucleus, while animal cells do not.

Plant cells have flagella, while animal cells have cilia.

6 / 50

What is the difference between positive and negative acceleration?

Positive acceleration occurs when an object is at rest. Negative acceleration occurs when an object moves at a constant velocity.

Positive acceleration occurs when an object changes direction. Negative acceleration occurs when an object moves in a straight line.

Positive acceleration occurs when an object's velocity increases with time. Negative acceleration (deceleration) occurs when an object's velocity decreases with time.

7 / 50

Explain the concept of valency in chemistry.

Valency is the same for all elements in the periodic table.

Valency is the number of protons in the nucleus of an atom.

Valency is the combining capacity of an element, representing the number of electrons it can gain, lose, or share to form a stable compound.

8 / 50

Define an atom and a molecule.

Atom: The smallest particle of a compound. Molecule: A mixture of atoms.

Atom: A molecule of an element. Molecule: A single atom.

Atom: The smallest indivisible particle of an element. Molecule: A group of two or more atoms chemically bonded together.

9 / 50

What are mitochondria, and what is their role in a cell?

Mitochondria are storage organelles for water and nutrients.

Mitochondria are involved in the synthesis of DNA.

Mitochondria are membrane-bound organelles responsible for energy production (ATP synthesis) through cellular respiration.

10 / 50

Describe the process of diffusion with an example.

Diffusion is the separation of substances through a semipermeable membrane. Example: Cooking pasta.

Diffusion is the mixing of particles of two substances due to their random motion. Example: Spreading perfume in a room.

Diffusion is the movement of particles from a region of lower concentration to higher concentration. Example: Lighting a candle.

11 / 50

Explain the types of plant tissues and their functions.

Plant tissues include meristematic tissue (growth), permanent tissue (storage and support), and simple tissues (photosynthesis and transportation).

Plant tissues include root tissue, stem tissue, and leaf tissue.

Plant tissues are all the same and have no specific functions.

12 / 50

Describe the concept of escape velocity and its significance.

Escape velocity is the minimum velocity required for an object to overcome the gravitational pull of a celestial body and enter space. It is significant for launching spacecraft and satellites into orbit.

Escape velocity is the velocity at which an object enters a planet's atmosphere.

Escape velocity is the velocity at which an object can travel indefinitely in space. It has no significance.

13 / 50

Explain the classification of living organisms into five kingdoms.

Living organisms are classified into five kingdoms: Monera (prokaryotes), Protista (single-celled eukaryotes), Fungi (multicellular, non-photosynthetic), Plantae (multicellular, photosynthetic), and Animalia (multicellular, heterotrophic).

Living organisms are classified into five kingdoms based on their size: Small, Medium, Large, Very Large, and Enormous.

Living organisms are classified into five kingdoms based on their habitat: Land, Water, Air, Underground, and Space.

14 / 50

What happens to the rate of evaporation when the surface area of the liquid is increased?

It remains the same

It increases

It decreases

15 / 50

What is inertia? How is it related to mass?

Inertia is the velocity of an object. It is unrelated to mass.

Inertia is the force applied to an object. It is inversely related to mass.

Inertia is the property of an object to resist a change in its state of motion. It is directly related to mass, where objects with greater mass have greater inertia.

16 / 50

What is the universal law of gravitation?

The universal law of gravitation states that only large masses attract each other.

The universal law of gravitation states that every mass attracts every other mass with a force that is inversely proportional to the product of their masses.

The universal law of gravitation states that every mass attracts every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

17 / 50

Describe the four major types of animal tissues.

The four major types of animal tissues are epithelial tissue (covering and lining), connective tissue (support), muscular tissue (movement), and nervous tissue (control and coordination).

The four major types of animal tissues are skin, bones, muscles, and blood.

The four major types of animal tissues are root tissue, stem tissue, leaf tissue, and flower tissue.

18 / 50

What is photosynthesis? Explain the process.

Photosynthesis is the process by which plants and some other organisms convert light energy, carbon dioxide, and water into glucose and oxygen using chlorophyll in the presence of sunlight.

Photosynthesis is the process by which cells produce ATP.

Photosynthesis is the breakdown of glucose to release energy.

19 / 50

Discuss the Bohr's model of the atom.

Bohr's model states that electrons are present inside the nucleus.

Bohr's model suggests that electrons move randomly within the nucleus.

Bohr's model proposes that electrons move in fixed orbits or energy levels around the nucleus, with each energy level having a specific energy.

20 / 50

Explain the difference between mass and weight.

Mass is the force exerted on an object due to gravity, and weight is the amount of matter in an object.

Mass is the amount of matter in an object and is a scalar quantity, measured in kilograms (kg). Weight is the force exerted on an object due to gravity and is a vector quantity, measured in newtons (N). Weight = mass × acceleration due to gravity (W = mg).

Mass and weight are the same concepts and can be used interchangeably.

21 / 50

How does the modern atomic model differ from Bohr's model?

The modern atomic model describes the behavior of electrons as existing in electron clouds or orbitals, unlike Bohr's fixed orbits.

The modern atomic model retains the fixed orbits of electrons as in Bohr's model.

The modern atomic model suggests that electrons are present inside the nucleus.

22 / 50

Explain the concept of momentum and its conservation.

Momentum is the velocity of an object. Momentum is conserved only when objects are at rest.

Momentum is the force applied to an object. Momentum is not conserved in any situation.

Momentum is the product of an object's mass and velocity. Momentum is conserved in a closed system, meaning the total momentum before an event is equal to the total momentum after the event, provided no external forces are acting on the system.

23 / 50

What is free fall, and how does it relate to acceleration due to gravity?

Free fall is the motion of an object under the influence of air resistance. The acceleration due to gravity (g) is not related to free fall.

Free fall is the motion of an object without any acceleration. The acceleration due to gravity (g) is zero.

Free fall is the motion of an object under the influence of gravity alone, with no other forces acting on it. The acceleration due to gravity (g) is the acceleration experienced by an object in free fall and is approximately 9.8 m/s² on the surface of the Earth.

24 / 50

Write the chemical formulae for the following compounds: water, carbon dioxide, and sodium chloride.

Water: H2O2, Carbon dioxide: CO, Sodium chloride: NaCl

Water: HO, Carbon dioxide: CO, Sodium chloride: NaCl2

Water: H2O, Carbon dioxide: CO2, Sodium chloride: NaCl

25 / 50

What are isotopes? Provide an example.

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Example: Carbon-12 and Carbon-14.

Isotopes are atoms with the same mass number.

Isotopes are atoms of different elements with the same number of neutrons.

26 / 50

What is the law of conservation of mass?

The total mass of substances involved in a chemical reaction varies randomly.

The mass of a substance can change during a chemical reaction.

The total mass of substances involved in a chemical reaction remains constant.

27 / 50

What is an atomic number?

The atomic number is the total number of particles in the nucleus of an atom.

The atomic number is the number of protons in the nucleus of an atom.

The atomic number is the number of neutrons in the nucleus of an atom.

28 / 50

What is matter?

Anything with mass and volume

Something without mass

Energy

29 / 50

Define force and give its SI unit.

Force is the velocity of an object. Its SI unit is meters per second (m/s).

Force is a push or pull on an object resulting from the interaction between objects. Its SI unit is the newton (N).

Force is the mass of an object. Its SI unit is the kilogram (kg).

30 / 50

Define a cell and list its basic functions.

A cell is a non-living entity that performs chemical reactions.

A cell is the structural and functional unit of all living organisms. Basic functions include growth, reproduction, metabolism, response to stimuli, and maintaining homeostasis.

A cell is a multicellular organism with specialized functions.

31 / 50

Explain the concept of the boiling point of a substance.

The temperature at which a substance changes from gas to liquid

The temperature at which a substance changes from liquid to gas throughout the liquid

The temperature at which a substance changes from liquid to solid

32 / 50

Describe the process of diffusion with an example.

Diffusion is the movement of particles from a region of lower concentration to higher concentration. Example: Lighting a candle.

Diffusion is the mixing of particles of two substances due to their random motion. Example: Spreading perfume in a room.

Diffusion is the separation of substances through a semipermeable membrane. Example: Cooking pasta.

33 / 50

Describe the Bohr's model of the atom.

Bohr's model states that electrons are located outside the nucleus.

Bohr's model suggests that electrons move randomly within the nucleus.

Bohr's model proposes that electrons move in fixed orbits around the nucleus, and each orbit has a specific energy level.

34 / 50

Explain the Rutherford model of the atom.

The Rutherford model suggests that atoms have a central nucleus containing protons and neutrons, with electrons orbiting around the nucleus.

The Rutherford model proposes that atoms consist of a single, indivisible particle.

The Rutherford model states that electrons are present inside the nucleus.

35 / 50

Explain Newton's first law of motion.

Newton's first law of motion states that an object always accelerates when a force is applied to it.

Newton's first law of motion, also known as the law of inertia, states that an object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an external force.

Newton's first law of motion states that an object in motion eventually comes to a stop on its own.

36 / 50

How does sublimation differ from evaporation?

Sublimation is the conversion of gas into a liquid, while evaporation is the conversion of a liquid into a gas at its surface

Sublimation is the conversion of gas into a solid, while evaporation is the conversion of a solid into a liquid

Sublimation is the conversion of solid into a gas without passing through the liquid state, while evaporation is the conversion of a liquid into a gas at its surface

37 / 50

Explain the structure and function of the cell membrane.

The cell membrane is a selectively permeable barrier that controls the entry and exit of substances in and out of the cell. It is composed of a lipid bilayer with embedded proteins.

The cell membrane is the site of protein synthesis in the cell.

The cell membrane stores genetic information.

38 / 50

What are fungi? Mention their main features.

Fungi are multicellular, non-photosynthetic organisms with a cell wall made of chitin. They obtain nutrients through absorption and play a vital role in decomposition.

Fungi are unicellular, photosynthetic organisms.

Fungi are plants with leaves and roots.

39 / 50

Define biodiversity and explain its importance.

Biodiversity refers to the extinction of species. It has no importance.

Biodiversity refers to the variety of living organisms on Earth. It is important because it ensures the stability of ecosystems, provides resources for human survival, and has aesthetic and cultural value.

Biodiversity refers to the number of animal species.

40 / 50

Describe the structure and function of the nucleus.

The nucleus is the site of energy production in the cell.

The nucleus contains genetic material (DNA) and controls cellular activities. It is surrounded by a nuclear membrane with pores.

The nucleus is responsible for synthesizing proteins.

41 / 50

Define the term 'boiling point elevation.'

The decrease in temperature at which a substance boils when a solute is added to it

The temperature at which a liquid changes into a gas

The increase in temperature at which a substance boils when a solute is added to it

42 / 50

Differentiate between a vertebrate and an invertebrate.

Vertebrates have an exoskeleton, while invertebrates have an endoskeleton.

Vertebrates are aquatic animals, while invertebrates are terrestrial animals.

Vertebrates have a backbone or vertebral column, while invertebrates do not have a backbone.

43 / 50

Differentiate between solids, liquids, and gases based on their characteristics.

Solids have fixed shape and volume, liquids take the shape of the container, gases have neither shape nor volume

Solids have neither shape nor volume, liquids take the shape of the container, gases have fixed shape and volume

Solids are shapeless, liquids have fixed shape, gases have fixed volume

44 / 50

How does sublimation differ from evaporation?

Sublimation is the conversion of solid into a liquid, while evaporation is the conversion of a liquid into a solid

Sublimation is the conversion of gas into a liquid, while evaporation is the conversion of a liquid into a gas at its surface

Sublimation is the conversion of solid into a gas without passing through the liquid state, while evaporation is the conversion of a liquid into a gas at its surface

45 / 50

Explain the concept of the boiling point of a substance.

The temperature at which a substance changes from liquid to solid

The temperature at which a substance changes from gas to liquid

The temperature at which a substance changes from liquid to gas throughout the liquid

46 / 50

Define subatomic particles - electrons, protons, and neutrons.

Electrons are negatively charged particles found in the nucleus. Protons are positively charged particles located outside the nucleus. Neutrons are neutral particles located outside the nucleus.

Electrons are negatively charged particles found outside the nucleus. Protons are positively charged particles located in the nucleus. Neutrons are neutral particles also found in the nucleus.

Electrons are positively charged particles found outside the nucleus. Protons are negatively charged particles located in the nucleus. Neutrons are positively charged particles found outside the nucleus.

47 / 50

Define evaporation. How does it take place?

Conversion of gas into a liquid at the boiling point

Conversion of solid into a liquid at the melting point

Conversion of liquid into a gas below boiling point

48 / 50

Differentiate between distance and displacement.

Distance and displacement are the same concepts.

Distance is a vector quantity, and displacement is a scalar quantity.

Distance is the total path length covered by an object, and it is a scalar quantity. Displacement is the shortest distance between the initial and final positions, and it is a vector quantity with magnitude and direction.

49 / 50

Explain the characteristics of particles of matter.

Attract each other

Stationary particles

No kinetic energy

50 / 50

Define tissue. How are plant tissues different from animal tissues?

Tissue is a group of similar cells performing a specific function. Plant tissues include meristematic, permanent, and simple tissues, while animal tissues are categorized as epithelial, connective, muscular, and nervous tissues.

Tissue is a group of dissimilar cells performing various functions. Plant tissues are the same as animal tissues.

Tissue is a single cell type found in both plants and animals.

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Maths Class 8

Maths

1 / 36

Determine the cube root of 343.

The cube root of 343 is 5.

The cube root of 343 is 9.

The cube root of 343 is 7.

2 / 36

If 3x - 4 = 11, what is the value of x?

The value of x is 5.

The value of x is 15.

The value of x is 7.

3 / 36

Calculate the median of the data set: 8, 12, 15, 18, 20, 22, 25, 30, 35.

The median of the data set is 18.

The median of the data set is 25.

The median of the data set is 20.

4 / 36

Factorize the expression: 6x² - 18x.

The factored expression is 6(x - 3).

The factored expression is 18x².

The factored expression is 6x(x - 3).

5 / 36

Calculate the value of √144 + √25.

The value of √144 + √25 is 13.

The value of √144 + √25 is 11.

The value of √144 + √25 is 12.

6 / 36

Identify the 3D shape that has 6 faces, all of which are rectangles.

The 3D shape is a cylinder.

The 3D shape is a rectangular prism or cuboid.

The 3D shape is a triangular pyramid.

7 / 36

Given the data: 12, 14, 18, 12, 16, 14, 20, 12, 16, 14, find the mode.

The mode of the data is 12 and 14 (bimodal).

The mode of the data is 16.

The mode of the data is 20.

8 / 36

Determine the surface area of a sphere with a radius of 6 cm. Use π (pi) as 22/7.

The surface area of the sphere is 792 square cm.

The surface area of the sphere is 452 square cm.

The surface area of the sphere is 264 square cm.

9 / 36

Solve the equation 2x - 5 = 7 to find the value of x.

The value of x is 2.

The value of x is 6.

The value of x is 12.

10 / 36

Solve the equation 2(x + 3) = 14 to find the value of x.

The value of x is 4.

The value of x is 8.

The value of x is 7.

11 / 36

Using a compass and ruler, construct a perpendicular bisector of a line segment AB, where AB measures 10 cm.

It is not possible to construct a perpendicular bisector.

The perpendicular bisector can be constructed by drawing an arc from points A and B, then connecting the intersections with a line segment that is perpendicular to AB and bisects it.

The perpendicular bisector can be constructed by drawing a straight line through the midpoint of AB.

12 / 36

Calculate the value of 4³ - 3³.

The value of 4³ - 3³ is 16.

The value of 4³ - 3³ is 37.

The value of 4³ - 3³ is 73.

13 / 36

Identify the type of quadrilateral with all sides of equal length and all angles of equal measure.

The type of quadrilateral is a square.

The type of quadrilateral is a parallelogram.

The type of quadrilateral is a rectangle.

14 / 36

Construct an angle of 60 degrees using a compass and ruler.

An angle of 60 degrees can be constructed by simply using a ruler to draw a straight line.

An angle of 60 degrees can be constructed by drawing a straight line, then using the compass to create a 60-degree angle from a specific point on the line.

It is not possible to construct an angle of 60 degrees.

15 / 36

Find the least number which must be added to 1056 to make it a perfect square.

The least number that must be added to 1056 to make it a perfect square is 12.

The least number that must be added to 1056 to make it a perfect square is 16.

The least number that must be added to 1056 to make it a perfect square is 14.

16 / 36

Determine the number of edges in a triangular pyramid.

A triangular pyramid has 12 edges.

A triangular pyramid has 9 edges.

A triangular pyramid has 6 edges.

17 / 36

Calculate the perimeter of a rectangle with length 6 cm and width 4 cm.

The perimeter of the rectangle is 20 cm.

The perimeter of the rectangle is 10 cm.

The perimeter of the rectangle is 24 cm.

18 / 36

Determine the square root of 169.

The square root of 169 is 13.

The square root of 169 is 11.

The square root of 169 is 15.

19 / 36

Calculate the volume of a cylinder with a radius of 4 cm and height 10 cm. Use π (pi) as 22/7.

The volume of the cylinder is 880 cubic cm.

The volume of the cylinder is 440 cubic cm.

The volume of the cylinder is 176 cubic cm.

20 / 36

Express 5^3 in exponential notation.

5^3 is expressed as 15.

5^3 is expressed as 125.

5^3 is expressed as 75.

21 / 36

Express the rational number 9/12 in its simplest form.

The simplest form of 9/12 is 4/3.

The simplest form of 9/12 is 2/3.

The simplest form of 9/12 is 3/4.

22 / 36

Determine the sum of the angles in a quadrilateral.

The sum of the angles in a quadrilateral is 360 degrees.

The sum of the angles in a quadrilateral is 90 degrees.

The sum of the angles in a quadrilateral is 180 degrees.

23 / 36

Find the least number which must be subtracted from 3375 to make it a perfect cube.

The least number that must be subtracted from 3375 to make it a perfect cube is 64.

The least number that must be subtracted from 3375 to make it a perfect cube is 100.

The least number that must be subtracted from 3375 to make it a perfect cube is 125.

24 / 36

If the cost of 5 pens is Rs. 30, what is the cost of 12 pens?

The cost of 12 pens is Rs. 72.

The cost of 12 pens is Rs. 90.

The cost of 12 pens is Rs. 60.

25 / 36

Determine whether the following numbers are rational or irrational: 5/8, √25, and 0.333...

5/8 is rational, √25 is rational, and 0.333... is rational.

5/8 is rational, √25 is irrational, and 0.333... is rational.

5/8 is irrational, √25 is irrational, and 0.333... is irrational.

26 / 36

Calculate 2^5.

2^5 is equal to 32.

2^5 is equal to 25.

2^5 is equal to 64.

27 / 36

Calculate the mean (average) of the following set of numbers: 10, 15, 20, 25, and 30.

The mean of the numbers is 20.

The mean of the numbers is 15.

The mean of the numbers is 25.

28 / 36

If the ratio of the ages of two friends is 5:3 and the older friend is 21 years old, how old is the younger friend?

The younger friend is 12 years old.

The younger friend is 18 years old.

The younger friend is 15 years old.

29 / 36

A shopkeeper offers a discount of 15% on a shirt priced at Rs. 800. Calculate the discounted price.

The discounted price of the shirt is Rs. 680.

The discounted price of the shirt is Rs. 760.

The discounted price of the shirt is Rs. 720.

30 / 36

Construct an isosceles triangle with a base of 6 cm and equal angles of 70 degrees each.

An isosceles triangle with the given specifications can be constructed by drawing the base and using the compass to create equal angles of 70 degrees at each endpoint of the base.

An isosceles triangle with the given specifications can be constructed by drawing the base, then creating two equal angles of 70 degrees at each endpoint of the base.

It is not possible to construct an isosceles triangle with a base of 6 cm and equal angles of 70 degrees each.

31 / 36

Expand and simplify the expression: (x - 3)(x + 3).

The expanded and simplified expression is x² - 9.

The expanded and simplified expression is x² + 6x + 9.

The expanded and simplified expression is x² - 6x - 9.

32 / 36

Find the area of a rectangle with length 8 cm and width 5 cm.

The area of the rectangle is 20 square cm.

The area of the rectangle is 40 square cm.

The area of the rectangle is 13 square cm.

33 / 36

Calculate the sum of the rational numbers 3/5 and 1/3.

The sum of 3/5 and 1/3 is 4/8.

The sum of 3/5 and 1/3 is 14/15.

The sum of 3/5 and 1/3 is 8/15.

34 / 36

Simplify the expression: 3x - 2y + 5x + 3y.

The simplified expression is 8x + y.

The simplified expression is 5xy.

The simplified expression is 3x + 2y.

35 / 36

Calculate the total number of vertices in a cube.

A cube has 6 vertices.

A cube has 8 vertices.

A cube has 12 vertices.

36 / 36

Simplify the expression: (3^4) / (3^2).

The simplified expression is 3^8.

The simplified expression is 3^2.