# 7th Class Science Physical and Chemical Changes Question Bank

### done Physical and Chemical Changes

• A) change occurs only in physical properties

B) transfer of energy takes place

C) is a reversible change

D) All of the above

• A) A new substance is formed

B) No new substance is formed

C) Gaseous phase changes to liquid phase

D) Both (b) and (c) are correct

• A) energy change

B) formation of new substances

C) change in chemical properties

D) All of the above

• A) It under goes oxidation and become brown in colour

B) Appearance of brown colour on the surface of apple slice is caused by a chemical reaction between air and enzymes

C) Both the above are correct

D) None of these

• A) the body of ship is always in contact with water.

B) the air around the ship is humid.

C) presence of salts in sea water speed up the process of rusting.

D) All of the above

• A) Painting

B) Greasing

C) Galvanization

D) Precipitation

• A) reversible change

B) physical change

C) chemical change

D) Both (a) and (b)

• A) reversible change

B) physical change

C) chemical and exothermic change

D) chemical and endothermic change

• A) physical change

B) chemical change

C) Both physical and chemical change

D) Neither physical nor chemical change

• A) chemical change

B) physical change

C) irreversible change

D) None of these

• A) Photosynthesis

B) Spoilage of food

C) Explosion of fire works

D) None of these

• A) a chemical reaction

B) a physical change

C) Crystallization

D) None of these

• A) Evaporation is a chemical change

B) Digestion of food is a chemical change

C) Burning of paper is a physical change

D) All of the above

• A) When coal is burnt no new substance is produced

B) Rust is not formed in the absence of air or oxygen

C) The fizz that comes out when a soda bottle is opened is due to a chemical change.

D) Respiration is a physical process

• A) Cutting of wood into pieces is a chemical change.

B) Conversion of manure from leaves is a physical change.

C) Iron pipes coated with zinc do not rust easily.

D) All of the above

• A) Iron and rust are same substance.

B) Rusting of iron is a chemical change.

C) Removal of rust from surface of iron is chemical change.

D) All of the above

• A) galvanization

B) electroplating

C) painting in zinc

D) None of these

• A) physical chemical change

B) exothermic chemical change

C) endothermic chemical change

D) None of these

• A) physical property

B) chemical property

C) thermal property

D) None of these

• A) Common salt is exposed to air

B) Coal is burnt in air

C) Sodium is placed in water

D) Iron is kept in moist air

• A) physical

B) chemical

C) Both physical and chemical

D) None of these

• A) Because it changes its colour

B) Because it makes iron powdery

C) Because a new substance is formed

D) None of these

• A) It is a chemical change because a new substance is formed

B) It is a physical change because the original substances can be recovered

C) It is a chemical change because there is exchange of heat

D) It is a physical change because there is a slight change in colour.

• A) Irreversible change

B) Physical change

C) Chemical change

D) None of these

• A) mud

B) dust

C) rust

D) None of these

• A) Evaporation

B) Condensation

C) Sublimation

D) All of the above

• A) Water

B) Air

C) Heat energy

D) Both (a) and (b)

• A) Burning of kerosene

B) Lighting an electric bulb

C) Heating sugar in a pan

D) Heating sulphur with iron fillings to red-hot state.

• A) Thermal change

B) Physical change

C) Neutralization

D) Fast change

• A) Air

B) Pure water

C) Sea water

• A) Chemical change

B) Cyclic change

C) Physical change

D) None of these

• A) Copper

B) Salt

C) Sugar

D) Muddy water

• A) Digestion of food

B) Conversion of liquified petroleum gas into gas on opening the cylinder.

C) Photosynthesis

D) Production of biogas from animal waste

• A) A = Oxygen, B = Carbon dioxide

B) A = Water, B = Oxygen

C) A = Oxygen, B = Rust (iron oxide)

D) A = Carbon dioxide, B = Oxygen

• A) $\text{F}{{\text{e}}_{\text{3}}}{{\text{O}}_{\text{4}}}$

B) $\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}$

C) $\text{FeO}$

D) None of these

•  Column - I Column - II (A) heat energy is evolved during the reaction (p) Physical change (B) Heat energy is absorbed (q) Chemical change (C) Digestion of food in the body (r) Exothermic reaction (D) Melting of wax (s) Endothermic reaction

A) (A) $\to$ (p), (B) $\to$ (q), (C) $\to$ (r), (D) $\to$ (s)

B) (A) $\to$ (q), (B) $\to$ (p), (C) $\to$ (r), (D) $\to$ (s)

C) (A) $\to$ (r), (B) $\to$ (s), (C) $\to$ (p), (D) $\to$ (q)

D) (A) $\to$ (r), (B) $\to$ (s), (C) $\to$ (q), (D) $\to$ (p)

•  Column - I Column - II (A) Pasteurization of milk (p) Physical change (B) Explosion of fireworks (q) Rusting of iron (C) A chemical equation (r) Physical change (D) Formation of iron oxide (s) $Magnesium\text{ }\left( Mg \right)+Oxygen~({{O}_{2}})\to Magnesium\,oxide\,(MgO)$

A) (A) $\to$ (s), (B) $\to$ (p), (C) $\to$ (q), (D) $\to$ (r)

B) (A) $\to$ (r), (B) $\to$ (p), (C) $\to$ (s), (D) $\to$ (q)

C) (A) $\to$ (r), (B) $\to$ (p), (C) $\to$ (q), (D) $\to$ (s)

D) (A) $\to$ (p), (B) $\to$ (r), (C) $\to$ (s), (D) $\to$ (q)

• A) physical change

B) chemical change

C) Both of the above

D) None of these

• A) Copper sulphate

B) Iron sulphate

C) Copper metal

D) none of these

• A) iron on iron nails

B) copper on iron nails

C) copper sulphate on iron nails

D) iron sulphate on iron nails

• A) 10%pure

B) between 20% to 50% pure

C) between 50% to 90% pure

D) more than 90% pure

• A) Process of crystallization is an example of a chemical change.

B) Process of crystallization is an example of a physical change.

C) Process of crystallization involves an irreversible change.

D) All the above are correct.

• A) unsaturated solution

B) saturated solution

C) true solution

D) None of these

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (i) is correct while statement (ii) is incorrect.

B) Statement (ii) is correct while statement (i) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (i) is correct while statement (ii) is incorrect.

B) Statement (ii) is correct while statement (i) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (i) is correct while statement (ii) is incorrect.

B) Statement (ii) is correct while statement (i) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Only (i)

B) Only (ii)

C) (i) and (ii)

D) None of the two

• A) Evaporation

B) Sublimation

C) Neutralization

D) Crystallization

• A) A

B) Both A and B

C) B

D) Equal in A, B and C

• A) I and III are correct

B) I and II are correct

C) Only III is correct

D) All of the above

• A) (i) and (ii)

B) (ii) and (iii)

C) (i) and (iii)

D) only (i)

• A) The process of conversion of liquid to gas involves a chemical change.

B) The process of burning gas is a chemical change.

C) Both the above are correct.

D) None of these

• A) (i) is a physical change and (ii) is a chemical change

B) (i) is a chemical change and (ii) is a physical change

C) Both (i) and (ii) are physical changes

D) Both (i) and (ii) are chemical changes

• A) Dissolution of ammonia in water

B) Dissolution of carbon dioxide in water

C) Dissolution of oxygen in water

D) None of these

• A) Mixing of paint colours

B) Cleaning rust of a bridge

C) Pressing fibres to make paper

D) Baking a cake

• A) Physical change

B) Chemical change

C) Both of these

D) None of these

• A) (i) is a chemical change, (ii) is a physical change

B) (i) is a physical change, (ii) is a chemical change

C) Both (i) and (ii) are physical changes

D) Both (i) and (ii) are chemical changes

• A) an exothermic physical change

B) an endothermic chemical change

C) an exothermic chemical change

D) an endothermic physical change

• A) rust

B) a brown solid

C) Both of these

D) None of these

• A) A is a chemical change whereas B is a physical change.

B) 5 is a chemical change whereas A is a physical change.

C) Both A and 5 are physical changes.

D) Both A and B are chemical changes.

• A) Copper

B) Nickel

C) Silver

D) Zinc

• A) i only

B) ii only

C) Both i and ii

D) neither i nor ii

• A) 1

B) 2

C) 3

D) No new substances is formed

• A) (i) is a chemical change; (ii) is a physical change.

B) (i) is a physical change; (ii) is a chemical change.

C) (i) and (ii) both are physical changes

D) (i) and (ii) both are chemical changes

• A) $\text{(i)}\,\text{CaC}{{\text{O}}_{\text{3}}}\text{;}\,\text{(ii)}\,\text{C}{{\text{O}}_{\text{2}}}$

B) $\text{(i) }{{\text{H}}_{\text{2}}}\text{O;}\,\text{(ii)}\,\text{CaC}{{\text{O}}_{\text{3}}}$

C) $\text{(i) C}{{\text{O}}_{\text{2}}};\,(\text{ii})\,\text{CaC}{{\text{O}}_{\text{3}}}$

D) $\text{(i)}\,{{\text{H}}_{\text{2}}}\text{O;}\,\,\text{(ii)}\,\text{C}{{\text{O}}_{\text{2}}}$

• A) Burning of coal does not produce a new substance.

B) Rust is hydrated $\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{.}$

C) The fizz that comes out when a soda bottle is opened is due to a chemical change.

D) Respiration is a physical process.

• A) Mass is conserved

B) Atoms are conserved

C) Mass as well as atoms are conserved

D) Molecules are conserved

• A) chemical change

B) physical change

C) None of (a) or (b)

D) Both (a) and (b)

• A) Sulphuric acid

B) Calcium carbonate

C) Copper sulphate

D) Zinc sulphate

• A) No, filament bum itself but that is not chemical change

B) Yes, filament bums itself like wood to give light

C) No, filament does not change into something new

D) Yes, filament made up of tungsten changes to its oxide on burning

• A) Chemical change

B) biological change

C) Physical change

D) None of these

• A) Silver

B) Copper

C) Aluminum

D) Zinc

• A) Amalgamation

B) Sublimation

C) Crystallization

D) Galvanization

• A) It is a physical change as only shape of axe changes.

B) It is a chemical change as heat is generated.

C) It is chemical change as iron turns into new metal.

D) None of these.

• A) brilliant green light

B) brilliant white light

C) brilliant red light

D) brilliant yellow light

• A) (I) is a chemical change

B) (II) is a physical change

C) Both are chemical changes

D) (I) is a physical change and (K) is a chemical change

• A) Calcium hydroxide

B) Sodium hydrogen carbonate

C) Calcium carbonate

D) None of these

•  Column - I Column - II (A) Magnesium burnt in air (p) Powdery ash is formed (B) Iron reacts with copper sulphate solution (q) Color changes from blue to green (C) Coal is burnt in air (r) $\text{C}{{\text{O}}_{\text{2}}}$is formed (D) Photosynthesis (s) $\text{C}{{\text{O}}_{\text{2}}}$is used

A) (A) $\to$ (p), (B) $\to$ (q), (C) $\to$ (r), (D) $\to$ (s)

B) (A) $\to$ (q), (B) $\to$ (p), (C) $\to$ (r), (D) $\to$ (s)

C) (A) $\to$ (q), (B) $\to$ (p), (C) $\to$ (s), (D) $\to$ (r)

D) (A) $\to$ (p), (B) $\to$ (q), (C) $\to$ (s), (D) $\to$ (r)

•  Column - I Column - II (A) The metal deposited on iron nails when they are dipped in the solution of copper sulphate. (p) Rusting (B) The substance/crust which gets deposited on an iron pan when left in moist air. (q) Copper (C) The process which converts iron to iron oxide in the presence of moisture and air. (r) Galvanization (D) Coating an iron sheet with a layer of zinc. (s) Rust

A) (A) $\to$ (q), (B) $\to$ (s), (C) $\to$ (p), (D) $\to$ (r)

B) (A) $\to$ (r), (B) $\to$ (s), (C) $\to$ (p), (D) $\to$ (q)

C) (A) $\to$ (q), (B) $\to$ (p), (C) $\to$ (s), (D) $\to$ (r)

D) (A) $\to$ (s), (B) $\to$ (q), (C) $\to$ (p), (D) $\to$ (r)

• A) Exchange of heat

B) Change of smell

C) Change of taste

D) All of these

• A) It is a chemical change because a new substance is formed

B) It is a chemical change because there is exchange of heat.

C) It is a physical change because the original substance can be recovered.

D) It is a chemical change because there is only change in colour.

• A) In a chemical change, colour of the object may change.

B) In a chemical change, heat will always be released.

C) A chemical change always involves physical change.

D) Rusting of iron becomes faster when humidity is high.

• A) Foul smell comes when food gets spoiled

B) Pollution of air due to explosion of fire-work.

C) Change in colour of a cut apple if left outside.

D) All of the above.

• A) change occurs only in physical properties

B) transfer of energy occurs

C) is a reversible change

D) All the above are correct

• A) it is accompanied by energy change

B) it is accompanied by formation of new substances

C) it is accompanied by change in physical properties

D) All the above are correct

• A) Chemical change

B) Physical change

C) Reversible change

D) Both (a) and (b)

• A) Hilly area

B) Desert area

C) Coastal area

D) Equally faster in all areas

• A) Painting iron door

B) Coating of iron pipes with zinc metal

C) Greasing of metal surface

D) All of these

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (i) and (iii) are incorrect but (ii) is correct

B) Statement (i) and (ii) are incorrect but (iii) is correct

C) All statements are correct

D) All statements are incorrect

• A) Statement (i) and (iii) are incorrect but (ii) is correct

B) Statement (i) and (ii) are incorrect but (iii) is correct

C) All statements are correct

D) All statements are incorrect

• A) Statement (i) and (iii) are incorrect but (ii) is correct

B) Statement (i) and (ii) are incorrect but (iii) is correct

C) All statements are correct

D) All statements are incorrect

• A) (i) only

B) (ii) only

C) (iii) only

D) (ii) and (iii)

• A)

B)

C)

D)

• A) Eggs

B) Plastic bottle

C) Both eggs & moth balls

D) All eggs, plastic bottle and moth balls

• A)

B)

C)

D)

• A) Evolution of ${{\text{O}}_{\text{2}}}$ gas

B) Evolution of $\text{C}{{\text{O}}_{\text{2}}}$ gas

C) Formation of $\text{Ca}{{\left( \text{OH} \right)}_{\text{2}}}$

D) Formation of $\text{CaC}{{\text{l}}_{\text{2}}}$

• A) A

B) B and C

C) C

D) A, B and C will get rust equally