Which of the following is the hardest substance...? Mcqs

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Which of the following is the hardest substance...?

(A) Copper
(B) Diamond

(C) Iron
(D) Silicon

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A (an) ______ is a pure substance which contains only one type of molecule made up of atoms of more than one element....?

(A) Compound
(B) Element

(C) Molecule
(D) Atom

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Which of the following are made up of two or more substances that are not chemically combined...?

(A) Compounds
(B) Elements

(C) Solutions
(D) Mixtures

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A thin partially permeable layer around the animal cell which control the substances that enter and exist is called...?

(A) Cell Wall
(B) Cell Membrane

(C) Cytoplasm
(D) Nucleus

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A reaction in which a new single compound is formed by the union of two or more substances is known as...?

(A) Decomposition Reaction
(B) Oxidation Reaction

(C) Addition Reaction
(D) Neutralization

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A method which is used to separate coloured chemicals or substances, especially dyes is known as...?

(A) Filtration
(B) Sublimation

(C) Paper chromatography
(D) Distillation

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The solubility of a solute substance increases _____...?

(A) As the liquid cools down
(B) As the liquid becomes more concentrated

(C) As the liquid heats up
(D) As the liquid becomes more diluted

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Shortest distance between two points is called...?

(A) Distance
(B) Speed

(C) Displacement
(D) Velocity

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The ice giants are mostly made of ‘volatile’ substances such as...?

(A) Water, mercury and methane
(B) Water, ammonia and mercury

(C) Water, plasma and methane
(D) Water, ammonia and methane

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What is the substance that causes undesirable change to the environment...?

(A) Climate Change
(B) Pollution

(C) Pollutant
(D) None

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Chlorophyll is a green substance that is present in _____...?

(A) Mitochondria
(B) Nucleus

(C) Chloroplast
(D) Golgi Apparatus

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The soapy touching property of substance are known as ____...?

(A) Acids
(B) Bases

(C) Salts
(D) Oxides

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What is the name of the substance which gets dissolved...?

(A) Solute
(B) Solvent

(C) Solution
(D) Mixture

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Which is the hardest substance in the human body...?

(A) Tooth enamel
(B) Skull

(C) Knee cap
(D) Rib

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Which of the following is the lightest substance...?

(A) Uranium
(B) Hydrogen

(C) Oxygen
(D) Nitrogen

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Some substances are good conductor of electricity in both the solid and liquid states. These substances are generally______________...?

(A) ionic substances
(B) metallic substances

(C) molecular solids
(D) covalent network solids

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Which of the following occurs when light passes through a substance unchanged...?

(A) Transmission
(B) Reflection

(C) Absorption
(D) Refraction

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The most densest substance on the Earth is __________....?

(A) Platinum
(B) Copper

(C) Steel
(D) Osmium

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The amount of heat needed to convert a substance from liquid to gas is called...?

(A) Heat of vaporization
(B) Specific heat

(C) Latent heat of fusion
(D) All

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Which process is used to get back the solid substances from a solution...?

(A) Crystallization
(B) Distillation

(C) Filtration
(D) Sublimation

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When a substance is dissolved in a liquid and no new substance is formed. What will these substances are called...?

(A) Solute
(B) Solution

(C) Compound
(D) None

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What is the name of the substance that dissolves the substance...?

(A) Solute
(B) Solvent

(C) Solution
(D) Mixture

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Fertilizers are substances containing chemical elements such as manure or mixture of ______...?

(A) Lipids
(B) Carbohydrates

(C) Nitrates
(D) Proteins

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Which lists the substances from least to most acidic...?

(A) Blood, milk, ammonia, orange juice
(B) Blood, ammonia, milk, orange juice

(C) Milk, blood, orange juice, ammonia
(D) Ammonia, blood, milk, orange juice

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The process of vaporizing a solid substance and condensing the vapours to form the solid directly is known as...?

(A) Distillation
(B) Sublimation

(C) Filtration
(D) Crystallization

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