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Science Test Class 9

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Science class 9

Science

1 / 40

Explain the concept of crop rotation in agriculture.

Crop rotation is a practice used only in animal farming.

Crop rotation is a practice in agriculture where different crops are grown in the same field in sequential seasons to maintain soil fertility, control pests and diseases, and improve crop yield.

Crop rotation is a practice of growing the same crop repeatedly in the same field.

2 / 40

How can you separate a mixture of salt and water?

By using a magnet to attract the salt particles.

By boiling the mixture and collecting the water vapor.

By dissolving the salt in water, leaving behind the sand, and then evaporating the water to recover the salt.

3 / 40

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.

4 / 40

Define the term 'matter' and provide examples of it.

Matter is only substances that are solid.

Matter is anything that has mass and occupies space. Examples include air, water, and wood.

Matter is something that is not tangible.

5 / 40

Differentiate between distance and displacement.

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.

Distance and displacement are the same concepts.

6 / 40

Explain the concept of the 3 R's in waste management.

The 3 R's in waste management stand for Recreate, Repair, and Replicate.

The 3 R's in waste management stand for Reduce, Reuse, and Recycle. Reduce means reducing the generation of waste, Reuse means using items multiple times, and Recycle means processing waste materials into new products.

The 3 R's in waste management stand for Refuse, Reject, and Remove.

7 / 40

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 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.

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

8 / 40

Explain the concept of valency in chemistry.

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

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

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

9 / 40

How can we prevent the spread of waterborne diseases?

Waterborne diseases cannot be prevented.

Waterborne diseases can be prevented by ensuring access to clean and safe drinking water, proper sanitation, and hygiene practices like handwashing.

Waterborne diseases can be prevented by vaccines.

10 / 40

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.

11 / 40

Explain the concept of kinetic energy.

Kinetic energy is the energy possessed by an object due to its motion. It depends on the object's mass and velocity.

Kinetic energy is the energy possessed by an object due to its position or height above the ground.

Kinetic energy is the energy stored in chemical bonds.

12 / 40

Define work in the context of physics.

Work is a measure of an object's mass.

Work is the energy stored in an object.

In physics, work is done when a force is applied to an object, and the object is displaced in the direction of the force.

13 / 40

Differentiate between plant cells and animal cells.

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

Plant cells have flagella, while animal cells have cilia.

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

14 / 40

Define sound and explain how it travels.

Sound is a form of mechanical energy that travels in the form of longitudinal waves through a medium, such as air, water, or solids.

Sound is a form of light energy.

Sound is a form of electromagnetic energy that travels through a vacuum.

15 / 40

What is meant by the melting point of a substance?

The temperature at which a substance changes from solid to liquid.

The temperature at which a substance changes from liquid to solid.

The temperature at which a substance changes from liquid to gas.

16 / 40

Explain the concept of diffusion with an example.

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.

Diffusion is the movement of particles from a region of higher concentration to lower concentration.

17 / 40

Describe the concept of sustainable development.

Sustainable development is a development approach that meets the needs of the present without compromising the ability of future generations to meet their own needs. It balances economic, social, and environmental considerations.

Sustainable development is a development approach focused only on economic growth.

Sustainable development is a development approach that ignores future generations' needs.

18 / 40

How can the depletion of natural resources be prevented?

Depletion of natural resources can be prevented by practicing sustainable resource management, reducing wastage, recycling, and using alternative sources of energy and materials.

Depletion of natural resources cannot be prevented.

Depletion of natural resources can be prevented by increasing their extraction.

19 / 40

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 stores genetic information.

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

20 / 40

Define a cell and list its basic functions.

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.

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

21 / 40

How can we conserve forests and wildlife?

Forest and wildlife conservation cannot be achieved.

Forest and wildlife conservation can be achieved by cutting down all the trees and controlling wildlife populations.

Forest and wildlife conservation can be achieved through measures such as protected areas, afforestation, anti-poaching efforts, sustainable logging practices, and creating awareness about conservation.

22 / 40

What are colloids, and provide an example of a colloid.

Colloids are a type of heterogeneous mixture. Example of a colloid: Sand and water mixture.

Colloids are a type of homogeneous mixture where particles are suspended in a medium. Example of a colloid: Milk.

Colloids are pure substances. Example of a colloid: Gold.

23 / 40

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 habitat: Land, Water, Air, Underground, and Space.

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

24 / 40

Write the chemical formulae for sulfuric acid and sodium chloride.

Sulfuric acid: HSO4, Sodium chloride: NaCl2

Sulfuric acid: H2SO4, Sodium chloride: NaCl

Sulfuric acid: H2SO3, Sodium chloride: Na2Cl

25 / 40

What are genetically modified crops (GM crops)? Provide an example.

Genetically modified crops are plants that have undergone natural mutations.

Genetically modified crops are plants that have not been altered in any way.

Genetically modified crops (GM crops) are plants whose DNA has been altered through genetic engineering techniques to enhance desired traits. Example: Bt cotton, which contains a gene from the bacterium Bacillus thuringiensis to resist pests.

26 / 40

What is inertia? How is it 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.

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.

27 / 40

Describe the four major types of animal tissues.

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

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.

28 / 40

What is the speed of sound in air at room temperature?

The speed of sound in air at room temperature (around 20°C) is approximately 343 meters per second (m/s).

The speed of sound in air at room temperature is 1000 m/s.

The speed of sound in air at room temperature is zero.

29 / 40

What is the atomic mass of an element?

The average mass of the atoms of an element compared to the mass of a carbon-12 atom.

The total number of electrons in an atom.

The number of protons in an atom.

30 / 40

Describe the advantages of organic farming.

Organic farming has no advantages.

Organic farming uses synthetic chemicals extensively.

Organic farming uses natural methods and avoids synthetic chemicals, promoting soil health, reducing environmental pollution, and producing healthier food.

31 / 40

Describe the characteristics of Monera and give examples.

Monera are multicellular organisms with a well-defined nucleus. Examples include fungi and algae.

Monera are complex, multicellular organisms with specialized organs. Examples include plants and animals.

Monera are prokaryotic, unicellular organisms with no nucleus. Examples include bacteria and cyanobacteria.

32 / 40

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 single cell type found in both plants and animals.

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

33 / 40

Describe the Dalton's atomic theory.

Dalton's atomic theory states that matter is composed of indivisible atoms, atoms of the same element are identical, atoms of different elements are different, and chemical reactions involve the rearrangement of atoms.

Dalton's atomic theory states that atoms can be divided into smaller particles.

Dalton's atomic theory states that atoms are composed of electrons, protons, and neutrons.

34 / 40

Explain the term 'pathogen' and provide examples.

Pathogens are microorganisms that cause diseases in humans. Examples include bacteria (e.g., Escherichia coli), viruses (e.g., Influenza virus), and fungi (e.g., Candida albicans).

Pathogens are substances that enhance the body's immune system.

Pathogens are only found in animals.

35 / 40

What is the universal law of gravitation?

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.

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

36 / 40

What is potential energy, and how is it related to height?

Potential energy is the energy stored in an object due to its position or height above the ground. The higher the object, the greater its potential energy.

Potential energy is the energy of motion.

Potential energy is the energy possessed by a moving object. The faster the object moves, the greater its potential energy.

37 / 40

Describe the characteristics of a sound wave.

Sound waves have characteristics such as mass and speed.

Sound waves have characteristics such as color and temperature.

Sound waves have characteristics such as amplitude (loudness), frequency (pitch), and wavelength.

38 / 40

Explain the concept of the gravitational constant (G).

The gravitational constant (G) is a variable that depends on the mass of the objects involved.

The gravitational constant (G) is a constant of proportionality in the universal law of gravitation. It represents the strength of the gravitational force and is approximately 6.674 × 10^(-11) Nm²/kg².

The gravitational constant (G) is a constant of proportionality in the law of motion. It represents the acceleration due to gravity.

39 / 40

Define a mixture and give an example of a homogeneous mixture.

A mixture is a single substance with a uniform composition. Example of a homogeneous mixture: Soil.

A mixture is a combination of two or more substances that are not chemically bonded. Example of a homogeneous mixture: Saltwater.

A mixture is a compound with a fixed composition. Example of a homogeneous mixture: Hydrogen gas.

40 / 40

What are isotopes? Give an example.

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

Isotopes are atoms with the same mass number but different atomic numbers.

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

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Maths Test class 9

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Maths Class 9

Maths

1 / 36

Determine the distance between points P(1, 3) and Q(4, 6).

The distance between points P(1, 3) and Q(4, 6) is 7 units.

The distance between points P(1, 3) and Q(4, 6) is √10 units.

The distance between points P(1, 3) and Q(4, 6) is 3 units.

2 / 36

Find the length of the median to the hypotenuse of a right-angled triangle with legs of lengths 5 cm and 12 cm.

The length of the median to the hypotenuse is 6.5 cm.

The length of the median to the hypotenuse is 10 cm.

The length of the median to the hypotenuse is 8 cm.

3 / 36

Convert the recurring decimal 0.454545... into a fraction.

The recurring decimal 0.454545... can be expressed as the fraction 4/11.

The recurring decimal 0.454545... can be expressed as the fraction 5/11.

The recurring decimal 0.454545... cannot be expressed as a fraction.

4 / 36

Determine the length of an arc of a circle with a central angle of 120 degrees and a radius of 8 cm. Use π (pi) as 22/7.

The length of the arc is 24 cm.

The length of the arc is 44 cm.

The length of the arc is approximately 37.71 cm.

5 / 36

Construct an equilateral triangle with sides of length 5 cm.

The equilateral triangle can be constructed by drawing three sides of length 3 cm each.

It is not possible to construct an equilateral triangle with sides of length 5 cm.

The equilateral triangle can be constructed by drawing three sides of length 5 cm each, forming three 60-degree angles at the vertices.

6 / 36

Find the area of a triangle with sides of lengths 7 cm, 24 cm, and 25 cm using Heron's formula.

The area of the triangle is 84 square cm.

The area of the triangle is 42 square cm.

The area of the triangle is 168 square cm.

7 / 36

Define vertically opposite angles.

Vertically opposite angles are pairs of angles formed by the intersection of two lines, and they are not equal in measure.

Vertically opposite angles are pairs of angles formed by the intersection of two lines, and they are equal in measure.

Vertically opposite angles are pairs of angles formed by the intersection of two lines, and their sum is 180 degrees.

8 / 36

Using a compass and ruler, construct a perpendicular bisector of a line segment AB, where AB measures 8 cm.

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.

It is not possible to construct a perpendicular bisector.

9 / 36

Perform the division: (3x² + 2x - 5) ÷ (x - 1).

(3x² + 2x - 5) ÷ (x - 1) equals 3x² + 5.

(3x² + 2x - 5) ÷ (x - 1) equals 3x + 5.

(3x² + 2x - 5) ÷ (x - 1) equals 2x - 5.

10 / 36

Determine the area of a trapezium with parallel sides measuring 10 cm and 14 cm, and the height of 7 cm.

The area of the trapezium is 42 square cm.

The area of the trapezium is 84 square cm.

The area of the trapezium is 112 square cm.

11 / 36

Find the coordinates of the midpoint of the line segment with endpoints A(3, 4) and B(7, 2).

The midpoint of the line segment AB is M(10, 6).

The midpoint of the line segment AB is M(5, 3).

The midpoint of the line segment AB is M(2, 7).

12 / 36

Calculate the perimeter of a right-angled triangle with legs of lengths 6 cm and 8 cm.

The perimeter of the right-angled triangle is 10 cm.

The perimeter of the right-angled triangle is 48 cm.

The perimeter of the right-angled triangle is 20 cm.

13 / 36

Explain the concept of a unique line through two distinct points.

A unique line through two distinct points is not possible.

Euclid's second postulate states that two distinct lines can be drawn through any two distinct points.

Euclid's first postulate states that a unique straight line can be drawn through any two distinct points. This means that there is only one line that connects two distinct points.

14 / 36

State Euclid's fifth postulate.

Euclid's fifth postulate states that if a straight line intersects two other straight lines, and the interior angles on one side are less than two right angles, then the two lines will eventually meet on that side.

Euclid's fifth postulate states that if a straight line intersects two other straight lines, the interior angles will be equal.

Euclid's fifth postulate states that if a straight line intersects two other straight lines, the interior angles on one side will be greater than two right angles.

15 / 36

Find the value of x in the given figure, where ∠ABC = 3x and ∠DBC = (x + 20).

The value of x is 60 degrees.

The value of x is 20 degrees.

The value of x is 40 degrees.

16 / 36

Calculate the semi-perimeter of a triangle with sides of lengths 9 cm, 12 cm, and 15 cm.

The semi-perimeter of the triangle is 27 cm.

The semi-perimeter of the triangle is 21 cm.

The semi-perimeter of the triangle is 18 cm.

17 / 36

Determine the type of triangle based on its angles: one angle measuring 75 degrees, another angle measuring 55 degrees, and the third angle measuring 50 degrees.

The triangle is an acute-angled triangle.

The triangle is an obtuse-angled triangle.

The triangle is a right-angled triangle.

18 / 36

Determine the measures of the angles of a trapezium if one of the angles is 75 degrees, the other three angles are equal, and the sum of the angles is 360 degrees.

The three equal angles in the trapezium measure 85 degrees each.

The three equal angles in the trapezium measure 105 degrees each.

The three equal angles in the trapezium measure 95 degrees each.

19 / 36

Express √144 as a rational number.

√144 is equal to 0.

√144 cannot be expressed as a rational number.

√144 can be expressed as the rational number 12/1.

20 / 36

Construct an angle of 90 degrees using a compass and ruler.

An angle of 90 degrees can be constructed by drawing a straight line and then using the compass to create a perpendicular line at a specific point on the line.

An angle of 90 degrees can be constructed by simply using a ruler to draw a straight line.

It is not possible to construct an angle of 90 degrees.

21 / 36

Calculate the area of a rhombus with diagonals measuring 8 cm and 10 cm.

The area of the rhombus is 40 square cm.

The area of the rhombus is 20 square cm.

The area of the rhombus is 64 square cm.

22 / 36

Define a polynomial and provide an example.

A polynomial is a whole number.

A polynomial is an algebraic expression consisting of variables and coefficients, combined using addition, subtraction, and multiplication, but not division by a variable. Example: 3x² + 2x - 5.

A polynomial is an expression that includes division by a variable.

23 / 36

Determine the angle that is complementary to a 35-degree angle.

The complementary angle to a 35-degree angle is 55 degrees.

The complementary angle to a 35-degree angle is 45 degrees.

The complementary angle to a 35-degree angle is 70 degrees.

24 / 36

Identify the degree of the polynomial 4x³ + 2x² - 7x + 1.

The degree of the polynomial 4x³ + 2x² - 7x + 1 is 3 because it is the highest power of the variable x in the polynomial.

The degree of the polynomial 4x³ + 2x² - 7x + 1 is 4.

The degree of the polynomial 4x³ + 2x² - 7x + 1 is 2.

25 / 36

Prove that the sum of the angles in a triangle is 180 degrees.

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

The sum of the angles in a triangle is 270 degrees.

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

26 / 36

Write the equation of a line with a slope of 3 and passing through the point (4, 5).

The equation of the line is y = 7x - 3.

The equation of the line is y = 3x - 7.

The equation of the line is y = 4x - 2.

27 / 36

Calculate the circumference of a circle with a radius of 7 cm. Use π (pi) as 22/7.

The circumference of the circle is 11 cm.

The circumference of the circle is 154 cm.

The circumference of the circle is 44 cm.

28 / 36

Find the area of a triangle with base 12 cm and height 5 cm.

The area of the triangle is 30 square cm.

The area of the triangle is 20 square cm.

The area of the triangle is 60 square cm.

29 / 36

Identify the type of quadrilateral with opposite sides parallel and equal in length, but with no right angles.

The type of quadrilateral is a square.

The type of quadrilateral is a rectangle.

The type of quadrilateral is a parallelogram.

30 / 36

Find the area of a sector of a circle with a central angle of 60 degrees and a radius of 5 cm. Use π (pi) as 22/7.

The area of the sector is 15 square cm.

The area of the sector is approximately 5.45 square cm.

The area of the sector is 110 square cm.

31 / 36

Find the equation of the line passing through points A(2, 1) and B(4, 5) in slope-intercept form (y = mx + c).

The equation of the line passing through points A(2, 1) and B(4, 5) is y = 4x - 6.

The equation of the line passing through points A(2, 1) and B(4, 5) is y = 2x - 3.

The equation of the line passing through points A(2, 1) and B(4, 5) is y = 3x - 2.

32 / 36

Determine the point of intersection of the lines 2x + 3y = 7 and 4x - y = 5.

The point of intersection is (3, 4).

The point of intersection is (2, 1).

The point of intersection is (1, 2).

33 / 36

Determine the area of a triangle with sides of lengths 8 cm, 15 cm, and 17 cm using Heron's formula.

The area of the triangle is 60 square cm.

The area of the triangle is 90 square cm.

The area of the triangle is 30 square cm.

34 / 36

Calculate the area of a parallelogram with base 6 cm and height 8 cm.

The area of the parallelogram is 12 square cm.

The area of the parallelogram is 30 square cm.

The area of the parallelogram is 48 square cm.

35 / 36

Solve the system of equations: 2x + y = 5 and 3x - 2y = 8.

The solution is x = 3 and y = 4.

The solution is x = 2 and y = 1.

The solution is x = 1 and y = 2.

36 / 36

Determine the value of (−3)².

(−3)² is equal to 9.

(−3)² is equal to −9.