Seniorhighub

Angiosperms have dominated land plants cheaply because of their nature of self-fertilization.

Angiosperms have dominated land plants cheaply because of their ability to produce a large number of seeds.

Angiosperms have dominated land plants cheaply because of the ability to adapt to diverse habitat.

Preamble: The graph of the equation x² + y² = 16 is symmetric with respect to;

The x – axis.

True

The y- axis.

True

The origin.

True

There is a difference between the pressure exerted by a gas and a pressure exerted by the weight of a mass resting on a surface.

A plot of pressure versus the reciprocal of the temperature at constant volume will give a straight line.

Avogadro’s law suggest equal volumes of helium gas and hydrogen gas at the same temperature and pressure contains the same number of atoms.

The gravitational field strength on the surface of a uniform spherical body is proportional to the radius of the body.

The gravitational field strength on the surface of a uniform spherical body is proportional to the mass of the body.

The gravitational field strength on the surface of a uniform spherical body is proportional to the inverse square of the radius of the body.

Basal metabolic rate in mammals is controlled by the liver.

Basal metabolic rate in mammals is controlled by the heart.

Basal metabolic rate in mammals is controlled by the thyroid.

Vertically opposite angles are adjacent.

Vertically opposite angles are complementary.

Vertically opposite angles are congruent.

The intermolecular forces in GaF_₃ are dipole- dipole.

The intermolecular forces in CH₃Cl are dipole- dipole.

The intermolecular forces in Ch₂Cl₂ are induce dipole- induce dipole.

The electric field inside a positively charge hollow conducting sphere is directed towards the centre of the sphere.

The electric field outside a positively charge hollow conducting sphere is directed away from the centre of the sphere.

The magnitude of electric field inside a hollow conducting sphere increase linearly from the centre of the sphere to its surface.

The escape velocity of a surface of a spherical celestial body depends on the surface of the radius of the body.

The escape velocity from the surface of a spherical celestial body depends on the surface gravity of the body.

Two spherical celestial bodies have the same escape velocity if they have the same surface gravity

In the smelting of iron in the blast furnace the sole function of the added coke is to provide the needed heat energy.

In the blast furnace the carbon(II) oxide formed reduces the iron(III) oxide in the ore to iron in two different chemical reactions.

The temperature inside the blast furnace is not uniform the top being hotter than the bottom.

Sister chromatids allows cells to store two copies of their DNA while the cell prepare to divide.

Sister chromatid help to ensure that both daughter cells get a copy of each of the pairings cells chromosomes.

Sister chromatids cross over to produce new genetic diversity in the daughter cell.

If the binary number abc₂ = 5, then a = 1, b = 1 and c = 0

If the binary number abc₂ = 4, then a = 1, b = 0, and c = 0

If the binary number abc₂ = 7, then a = 1, b = 1 and c =1.

The focal length in air of a bi- convex lens made of glass of refractive index 1.5 is greater than the focal length of the same lens in a liquid of refractive index of 1.3.

The focal length in air of a bi- convex lens made of glass of refractive index 1.5 is equals the focal length of the same lens in a water.

The focal length in air of a biconvex lens made of glass of refractive index 1.5 is positive whereas the focal length of the same lens in a liquid of refractive index 16 is negative.

Atoms of calcium with atomic number 20 have s electrons at 4 different energy level.

The atom of an element with atomic number 16 has uncompleted outermost subshell.

There are 18 elements in period 4 and 32 in period 5 of the Periodic Table

Chemoautotrophs are by far the most common type of produces on air.

Most Chemoautotrophs use a pigment such as chlorophyll to catch photons from the sun and harvest their energy.

Herbivores, Carnivores and Omnivores are all heterotrophs

Under a reflection in a plane, distance and angular measure are preserved.

Under a magnification of a polygon, angular measure is not preserved.

Under a reflection area of a polygon is preserved.

Preamble: The diameter of a solid sphere is d.

The surface area of the sphere is given by x = πd2

True

The volume of the sphere is given by V = 2πd3 / 3

False

The cross sectional area of a hemisphere of the sphere is a = π∏d2 / 2

False

Carbon- carbon bond cannot be oxidized.

Any hydrocarbon with the general formula CnH₂N will always react with hydrogen in the presence of palladium or nickel.

The acronym DDT stands for dichlorodiphenyltrichloromethane

Copepods lack circulatory system and gill instead oxygen is absorbed directly by the skin.

Most copepods contain one centrally located compound eye however some species lack an eye.

Copepods possess specialize thoracic appendages called maxillipeds that are used for feeding.

The numerical aperture of a step index optical fibre equals the difference between the cladding and core refractive indices.

The numerical aperture of a step index optical fibre equals the average of the cladding and core refractive indices.

The greater the numerical aperture of a step index optical fibre the greater the maximum angle of incidence for light guided by the core.

Preamble: X is a real number

If x2 > 4, then x > 2

False

If x3 < -27, then x < -3

True

If x2 < -3, then x > -3

True

Silica is a giant molecule in which silicon oxygen silicon bond are all covalent.

Aluminium oxide and silicon oxide are both amphoteric.

Catalyst perform their functions without undergoing any chemical change.

Preamble: State whether this statement are true or false about the hurdles to human cloning.

There are no individuals ready to be cloned

False

They are legal and ethical issues involved in the process

True

A low percentage of the nuclear transfers results in non-viable organism

False

Preamble: In an experiment to investigate coulombs law two identical insulated spheres are suspended close to each other and each is given the same charge Q.

If the charge on it sphere is doubled the repulsive force on each of them doubles.

False

If the separation between the spheres is halved the repulsive force on each of them is quadruples.

True

The repulsive force on each sphere is proportional to common charge Q on each of them.

False

Chromatic aberration in a spherical lens results in a blurred image because light rays passing through the lens at different distances from the pole are brought to focus at different points.

Chromatic aberration is not observed in the images formed by curved mirrors.

Preamble: A and B are polynomial expressions.

If AB = 0, then A = 0.

False

If A/B is undefined the B = 0.

True

If A/B is undefined then A = 0.

True

On adding dilute HCI to sodium sulphide a gas that decolourises acidified KM_nO4 solution is given out.

On adding dilute H₂SO4 to sodium trioxosulphate (IV) solution, a solution that decolourises acidified KM_nO4 is given out.

On adding A_gNO₃ solution to a solution, the formation of a solid that does not dissolve in dilute HNO₃ but dissolves in ammonia solution indicates the presence of chloride in the solution.

Red algae differ from other algal forms in lacking flagellated reproductive cells.

The red algae and brown algae are predominantly unicellular.

In some algae both haploid and diploid cells undergo mitosis.

The transformation in the plane given by (ϰ, y) → (-ϰ, y) is a reflection in the ϰ-axis.

The transformation in the plane given by (ϰ, y) → (-ϰ, -y) is a reflection in the origin.

The transformation in the plane given by (ϰ, y) → (y, ϰ) is a reflection in the line y = ϰ.

Fleshy fruits are adapted to wind dispersal.

Dry fruits are adapted for dispersal by mammals.

Fleshy fruits have soft and pulpy pericarp at maturity and the endocarp hardens.

Nucleons are held in the nucleus of an atom by an electrostatic forces.

Nuclear binding energy accounts for the mass difference between a light nucleus and the sum of the masses its constituents.

The range of the fundamental force that binds nucleons in an atomic nucleus is very large.

The chloride ion is smaller than chlorine atom.

The sodium ion (Na⁺) is bigger than magnesium ion (Mg²⁺).

Atomic size decreases from left to right in a period of the Main Group elements.

A statement is true if its negation is false.

If a statement is true, then its converse is also true.

If as statement is false, then its converse is true.

The ribosomes of prokaryotes and of eukaryotes are somewhat similar in that both consist of different sized sub-units.

Eukaryotic ribosomes are larger but the structure of prokaryotic ribosomes is better understood.

In eukaryotic cells, the utilization of food molecules such as glucose begins in the mitochondrion.

The net capacitance of two capacitors in parallel equals the sum of the capacitances of the capacitors.

When an alternating potential difference is applied across the terminals of a capacitor, the amplitude of the current that flows is directly proportional to the frequency.

The reactance of an ideal capacitor is directly proportional to frequency.

Polymerization of ethane into polythene can be initiated using a cation or anion or a free radical.

In the polymerization of 1, 3-butadiene, there will always be a double bond in the chain.

Proteins are examples of condensation polymers.

One and only one straight line can be drawn through any two points in a plane.

Two distinct lines in a plane can intersect in at most one point.

Two lines in a plane can intersect in more than one point.

In a food chain, the first topic level is occupied by herbivores.

The organisms in the first tropic level of a food chain are secondary consumers.

A food chain also shows how the organisms are related to each other by the food they eat.

The first Ionization energy of sodium is lower than that of potassium.

The first Ionization energy of carbon is lower than that of boron.

The first Ionization energy of boron is lower than that of beryllium because boron is a smaller atom.

The anterior end of paramecium is blunt.

The gullet of paramecium is lined with cilia.

The vacuole of Paramecium is stationary.

The greatest square factor of 200 is 25.

π is a rational number.

Any terminating or recurring decimal is a rational number.

The specific latent heat of fusion of a solid is the thermal energy required to melt a sample of the solid at constant temperature.

Because the temperature of a melting solid remains constant, its total internal energy also remains constant during melting.

The thermal energy absorbed when a solid melts at a constant temperature equals the thermal energy liberated when the liquid formed freezes at constant temperature.

Hydrogen is the abundant element in the universe.

Silicon is the most abundant element in the earth's crust.

Calcium is more abundant than aluminium in the earth's crust.

Wind pollinated flowers produce smaller quantities of sticky pollen.

Wind pollinated plants produce small inconspicuous scentless flowers.

Wind pollinated plants produce small anthers which are firmly attached to the filament.

Only a square matrix has a determinant.

The determinant of a square matrix is always positive.

A matrix has an inverse if the determinant is zero.

In an isothermal process involving a fixed quantity of an ideal gas, pressure is inversely proportional to volume.

In an isobaric ideal gas process, temperature is inversely proportional to volume.

An isometric ideal gas process occurs at a constant volume.

All protozoans are multicellular organisms.

Some free living flagellate species survive by preying on other protists.

Some flagellates are human pathogens.

Solid phosphorus is made up of P4 units held by electrostatic charges.

Argon exists as free atoms held by Van Der Waals forces.

The allotrope of sulphur stable below 98°C is α-sulphur, and it is made up of molecule of octagonal rings of sulphur.

If the expression (ϰ - 1) (ϰ + 2) = 6, then ϰ – 1 = 6, or ϰ + 2 = 6.

A quadratic equation always has two real roots.

If ϰ² = 9, then ϰ = 3.

The moment of inertia of a spherical shell about an axis passing through its centre is proportional to the radius of the shell.

The moment of inertia of a spherical shell about an axis through its surface is larger than its moment of inertia about an axis through it centre.

The moment of inertia of a spherical shell about an axis passing through its centre of the shell is proportional to the mass of the shell.

The nucleus is usually the largest organelle in the cell.

The nucleus of most animal cell is substantially larger than most entire prokaryotic cells.

The possession of a membrane-bound organelle is a defining property of the prokaryotic cell.

The shape of the water molecule is V or bent.

The shape of the CO₂ molecule is V or bent.

The four carbons in 1, 3-butadiene are not in the same plane.

A repeating decimal is not an irrational number.

A terminating decimal is a rational number.

A non- terminating, non-repeating decimal is an irrational number.

The kinetic energy of a photon is 1/3 mv² where m is the photon mass and V is the speed of light.

The linear momentum of a photon equals its energy divided by the speed of light.

The energy of a photon is a proportional to its frequency.

In the electrolysis of molten alumina, both electrodes can be carbon.

If both electrodes in the electrolysis of molten alumina are carbon, the cathode burns off during the process.

Since bauxite contains hydrated aluminium oxide, another way of obtaining alumina could be heating bauxite to very high temperatures.

The insects differ from the rest of the anthropods in having only three pairs of jointed legs on the thorax and, typically, two pairs of wings.

In insects only the outermost layer of the cuticle is shed, the inner layers are digested by enzymes secreted from the epidermis.

All antropods have a hard exoskeleton or cuticle, segmented bodies and jointed legs.

The image formed in a concave spherical mirror of a paraxial object is always inverted.

Paraxial rays parallel to the principal axis of a concave mirror converge to a point midway between the centre of curvature and the pole of the mirror.

The image formed in a concave spherical mirror of a paraxial object located at the centre of curvature of the mirror has unit magnification.

The function f(ϰ) = 4ϰ² – 5 is an even function.

The function f(ϰ) = 3ϰ³ – 2ϰ is an odd function.

The function f(ϰ) = 2ϰ + 1 is neither even nor odd.

The oxidation state of manganese in its oxide Mn₂O₃ is +3.

The oxidation state of manganese in K₂MnO₄ and KMnO₄ are +6 and +8 respectively.

The +7 state of manganese is easily reduced to the +2 state in acidic media.

Osmosis is the movement form a concentrated solution to a dilute solution across a partially permeable membrane.

Osmosis is the movement of a dissolved substance from a concentrated solution to a dilute solution across a partially permeable membrane.

Osmosis is the movement of water from a dilute solution to a concentrated solution across a partially permeable membrane.

A p-type semiconductor always contains excess protons.

An n-type semiconductor always has a net negative charge.

An intrinsic semiconductor contains equal concentrations of electrons and holes.

A square pyramid has four triangular faces.

A square pyramid has four vertices.

A square pyramid has 6 edges.

Acid hydrolysis of fats and vegetable oils produces alkonic acids and an alkenetriol.

Starch and cellulose, on hydrolysis will give different products in solution.

Some vegetable oils can be used directly as fuel for vehicles.

Accommodation of the human eye is best described as the changing of lens shape due to varying light intensities.

Accommodation of the human eye is best described as the ability to see distant objects.

Accommodation of the human eye is best described as the focusing of near and distant objects.

In a right angle triangle, the hypotenuse is the longest side.

In an isosceles right angle triangle, if the length of the legs is ϰ, the length of the hypotenuse is ϰ√3.

The midpoint of the hypotenuse of a right angle triangle is equidistant from all three vertices of the triangle.

Two objects in thermal equilibrium have the same temperature as well as the same pressure.

When two objects are separately in thermal equilibrium with a third object, the two objects are in thermal equilibrium.

When two objects at different temperatures are placed in thermal contact, energy is spontaneously transferred from the object with the higher temperature to the one with the lower temperature.

Electronegativities of the elements in the second period of the Periodic Table increase from left to right.

In group 5 or 15 of the Periodic Table there is only one metallic element.

Atomic radius decreases from left to right consistently in a Period of the Main Group elements.

Symbiotic association may involve two plants.

Symbiotic association is always between two similar species.

In symbiosis, the symbionts must be living.

The difference between a number and its additive inverse is zero.

The sum of a negative number and a positive number is a negative number.

The product of a positive number and a negative number is never zero.

An object whose acceleration is proportional to but opposite its displacement moves at constant speed.

The velocity of a moving object cannot be zero if its acceleration is proportional to but opposite its displacement.

Mitochondria are green because of the chlorophyll they contain.

Energy-rich compounds from the cytosol are oxidised in the chlorophyll.

The outermost region of the mitochondrion folds to form the cristae.

A parallelogram with a right angle is a rectangle.

A rectangle is a parallelogram.

A rectangle is a square.

The limiting thermal efficiency of a heat engine depends on the temperatures of the hot and cold thermal reservoirs between which it operates.

A real heat engine cannot convert all the thermal energy it receives into work.

Because adiabatic processes occur without heat exchange, a heat engine cannot operate on a cycle that includes an adiabatic process.

Both CO₂ and SO₄ molecules have the same shape.

CH₄ and NH₃ have different shapes; this is as a result of the difference in the hybridization of the bonding orbitals of carbon and nitrogen.

In cyclohexane all the 6 carbons are in the same plane.

Sleeping sickness, one of the most dreaded diseases in Africa, is caused by a flagellate.

The vector for sleeping sickness is a type of worm.

The vector for sleeping sickness can infect only humans but not any other mammal.

0.49 is an exact square.

(³⁶/₁₅) is an exact square.

0.9 is not an exact square.

The resistance of a circuit containing two identical resistors in parallel equals twice the resistance one of the resistors.

The current in a circuit containing two identical resistors in series equals twice the current in one of the resistors.

The resistance of a circuit containing two identical resistors in series equals twice the resistance of one of the resistors.

The electron affinity in kJmol^-1 of sulphur is larger than that of oxygen.

Whilst beryllium and magnesium have positive values of electron affinity, lithium and sodium have negative values.

The more negative the value of the electron affinity for an element, the more stable the anion formed.

A massive body moving with constant velocity requires a larger force to keep it moving than does a less massive body moving with the same constant velocity.

A body moving with a high but constant velocity requires a larger force to keep it moving than does a similar body moving with a lower constant velocity.

If an object moves with constant velocity, the net force on it is zero.

Avogadro's law states that equal volumes of any two gases at the same temperature and pressure contain the same number of molecules.

The law of combining volumes is different from the law proposed by Gay-Lussac.

The ideal Gas law is a composite of Boyle's law, Charles' law and Avogadro's law.

Log(ϰ²/y⁵) = 2logϰ – 5logy.

Log(2ϰ³) = 6logϰ.

Log(ϰ + y) = logϰ + logy.

In an ecosystem autotrophs produce organic compounds that serve as food for them and other organisms.

Flowers are the primary structures used in grouping plant families.

Photosynthesis involves the breakdown of complex inorganic molecules.

The angular momentum of the electron in the Bohr model of the hydrogen atom equals h in the ground state.

The angular momentum of the electron in the Bohr model of the hydrogen atom equals 2 h in the first excited state.

The energy in the first excited state of the electron in the Bohr model of the hydrogen atom is twice the ground state energy.

When ammonia is heated strongly with ethanoyl chloride, ethylamine is formed.

Secondary alkanols produce alkanoic acids when oxidized with acidified K₂Cr₂O₇ solution.

When ants bite the bite itches because of the methanol the ants inject into the bite.

For a regular polygon, only the sides are congruent.

A regular quadrilateral is a square.

An equiangular triangle is a regular polygon.

Collenchyma cells are lignified and living at maturity.

Collenchyma cells provides support for woody plant.

Sclerenchyma cells are lignified and living at maturity.

The energy of a photon is inversely proportional to its wavelength.

The linear momentum of a photon is directly proportional to its wavelength.

The energy of a photon equals the product of its linear momentum and the speed of light in vacuum.

The elements that comes immediately before Radium is Strontium in Group 2 of the Periodic Table.

Phosphorus has a lower atomic number than silicon.

Silicon and germanium are both considered to be semi-metals or metalloids.

The center of a circle is a point of the circle.

The ratio of the circumference to the diameter of the circle is π.

A chord connects the center of a circle to a point of the circle.

The liver is responsible for regulation of blood sugar.

The liver is responsible for the formation of bile.

The liver is responsible for the excretion of urea from the blood.

The lower fixed point on the Celsius scale is assigned the temperature 0°C.

The upper fixed point on the Fahrenheit scale is assigned the temperature 100°F.

The interval between the steam point and the ice point on the Fahrenheit scale is divided into 180 units.

The identity of two solutions, one containing Pb²⁺ ion and the other containing Ca²⁺ can be determined using NaOH solution.

The identity of two solutions, one containing Pb²⁺ ion and the other containing Ca²⁺ can be determined using dilute H₂SO₄.

The identity of two solutions, one containing Zn²⁺ ion and the other aluminium ions can be determined using NaOH solution.

Preamble: The implication "if P then Q" is true if.

P is true.

False

P is false.

True

P is true and Q is false.

False

The rate of transpiration of a leafy shoot would be highest under damp, cold, still air.

The rate of transpiration of a leafy shoot would be highest under damp, cold, moving air.

The rate of transpiration of a leafy shoot would be highest under dry, warm, moving air.

The flow of energy through life is not an endless cycle.

As energy moves up the food chain there is less and less of it to go around.

Only a small portion of the plant energy that is consumed by a herbivore is used by that herbivore for its metabolic activities.

If ϰ < 1, then ϰ < 0.

If ϰ < 1, then -ϰ < -1.

If ϰ < 1, then ϰ < 2 .

When an object thrown vertically upward attains its highest point, the force of gravity on it is zero.

Acceleration is zero at the highest point in the trajectory of an object launched at the angle to the horizontal.

At the highest point in the trajectory of an object launched vertically upward, the object is momentarily at rest.

When H₂S gas is bubbled through a Copper (II) solution, a black precipitate is formed.

Zinc sulphide is white.

When H₂S gas is bubbled through a Calcium (II) solution, a white precipitate is obtained.

Plastids are found in both prokaryotic and eukaryotic cells.

Plastids are the sites of cellular respiration in plants.

All Plastids are surrounded by single membranes.

(ϰ - 1) is a factor of (ϰ⁴ + 1).

(ϰ + 1) is a factor of (ϰ³ + 1).

(ϰ - 2) is a factor of (ϰ⁴ - 16).

An object submerged in a fluid displaces its own weight of fluid.

If a solid object becomes submerged when placed in a fluid, the density of the object is lower than that of the fluid.

A floating object displaces its own weight of fluid.

An element with atomic number 20 will have valences of 1 and 2.

Nitrogen is capable of forming different compounds in which the oxidation state is positive or negative.

Conversion of methane into ethane involves oxidation of the carbon.

Pollination can take place without fertilization.

Fertilization can take place without pollination.

Pollination and fertilization must occur at the same time.

cos( 90° - A) = cosA.

Cos( 90° -+A) = sinA.

sin( 90° + A) = cosA.

Iron (II) sulphide, obtained by passing H₂S through a solution of iron (II) salt is coloured blue.

When dilute ammonia is added dropwise to iron (III) solution, a red-brown precipitate is formed which dissolves in excess ammonia.

Bubbling H₂S gas through a solution of calcium ions gives a white precipitate.

The period of a simple pendulum is directly proportional to the square of the length of the pendulum.

Thermal expansion can cause thee length of a simple pendulum to increase, thereby increasing the period of the pendulum.

The period of a simple pendulum on the moon is different from the period of the same pendulum on earth because the weight of the bob of the pendulum on earth is different from the weight on the moon.

A protein- digesting enzyme when mixed with starch solution would produce glucose.

A protein- digesting enzyme when mixed with starch solution would produce amino acids.

A protein- digesting enzyme when mixed with starch solution would have no action.

A parallelogram with a right angle is a square.

A parallelogram with two adjacent congruent sides is a rhombus.

A square is a rectangle.

For the extraction of the iron metal from its ore using the Blast Furnace, the other raw materials required are coke and sand.

Steel is a solid solution, with solute and solvent being solids.

Aluminium is no longer used in the manufacture of cooking utensils because it has been found to be poisonous.

When light is incident at a plane interface between two media, the angle of reflection equals the angle of incidence.

When light is incident at a curved interface between two media, the angle of reflection depends on the angle of incidence and the curvature of the interface.

When light is incident at the interface between two media, the incident, reflected and transmitted rays are coplanar.

The rate of the reaction of a piece of solid reacting in a heterogeneous mixture will depend on the moles of the solid present and the temperature only.

The activation energy of a reaction determines the rate of the reaction.

The rates of the forward and backward reactions of a reversible reaction are affected to the same extent by the addition of a catalyst.

Because the moon has a smaller mass than the earth, the gravitational force the moon exerts on the earth is much smaller than the force the earth exerts on the moon.

Because newton"s law of gravitation is universal, the force of gravity on an object on the lunar surface equals the force of gravity on the same object on the earth"s surface.

An ant on the surface of the earth pulls on the earth with as much force as its weight.

Preamble: The following applies to a quadratic equation.

If the discriminant is positive, the quadratic equation has no negative root.

False

If the discriminant is negative, the quadratic equation has negative roots.

False

If the discriminant is zero, the quadratic equation has exactly one real root.

True

The Plant cell wall completely isolates adjacent cells from one another.

The cell wall of plant cells lies outside the plasma membrane.

The principal chemical component of plant cell walls are phospholipids.

All amines contains the functional group –NH₂.

All alkanoic acids contain the –OH group.

Most alkanoic acids are stronger acids than HCO^3-.

The elastic limit of an elastic material is the largest stress that the material can withstand without sustaining fracture.

At the elastic limit, stress is zero.

Stress may not be proportional to strain at the elastic limit.

If two triangles are equiangular, they are similar.

If two quadrilaterals are equiangular, they are similar.

If two pentagons are equiangular, they are similar.

Ligaments are similar to tendons as they are both made of connective tissue.

The difference between ligaments and tendons is that tendons connect one bone to another bone, ligaments connect muscle to bone.

Tendons may also attach muscles to structures such as the eyeball.

The wavelength of a travelling wave equals the reciprocal of the frequency of the wave.

The product of the period and the frequency of a wave is proportional to the velocity of the wave.

The wavelength of a travelling wave equals the reciprocal of its period.

There is only one metalloid in the 3rd period of the Main Group Elements of the Periodic Table.

Lithium atom has a larger radius than beryllium but smaller radius than sodium.

Since sodium has a bigger atomic radius than sulphur, sodium cation will also have a larger radius than sulphide ion.

Addition of functions is commutative.

Subtraction of functions is associative.

Composition of functions is commutative.

All the organisms of one species living in a defined area form a habitat.

A self-supporting group of organisms and their environment constitute a community.

The place where an organism is usually found is the habitat.

The relative density of an object that floats water equals the ratio of the weight in air of the object to the upthrust on the object in air.

The upthrust on a floating object equals the weight of the object.

A floating object displaces its own weight of fluid.

The most important criterion for a reaction to be explosive is the rate of the reaction.

Reactions in the gaseous phase are usually faster than reactions in the liquid phase.

First order reactions are usually faster than second order reactions.

The absolute value of any real number is positive.

/-a/ = -/a/.

| ab| = |a |. | b |.

Transpiration draws dissolved salts up the stem.

Transpiration speeds up photosynthesis.

Transpiration has a cooling effect on the leaves.

Every relation is a function.

Some functions are not relations.

Every function has an inverse.

A protein molecule which is denatured has a spit into smaller molecules.

A protein molecule which is denatured has changed its shape.

A protein molecule which is denatured has been diluted.

Two bodies are in thermal equilibrium when they have the same temperature.

No energy transfer occurs between two systems in thermal equilibrium because they are at the same temperature.

Two systems in thermal equilibrium have equal total internal energy.

All hydrides of the elements of the second period of the Periodic Table are covalent.

The hydrides of the non-metallic elements of the second period of the Periodic Table are acids.

Lithium hydride dissolves in water to give an alkaline solution.

Preamble: If A is an acute angle,

cosA > sinA.

False

tanA > 0.

True

sinA > tanA.

True

Parasitism is a biotic factor in an ecosystem.

Predation is a biotic factor in an ecosystem.

Oxygen concentration is abiotic factor in an ecosystem.

The gravitational potential of a point particle varies directly as distance from the particle.

The gravitational potential at a point outside a spherical object doubles when the mass of the object doubles.

The gravitational potential inside a uniform spherical mass distribution varies directly as a distance from the centre of the sphere.