Explore topic-wise MCQs in Science.

This section includes 57 Mcqs, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.

1.

DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage - 1 Copper statues exposed to carbon dioxide and water in the air become coated with patina. The patina is not copper, it is not carbon dioxide, and not water. It is a new substance formed by the reaction of these chemicals with one another. The change described above is a

A. reversible change
B. irreversible change
C.  Electrons in a beam are moving due south.
D. contraction
Answer» C.  Electrons in a beam are moving due south.
Discussion
2.

Choose the incorrect statement. 

A.  The heating of sugar is a permanent change. 
B.  Sugar decomposes to form charcoal.
C.   
D.  The powdering of sugar is a physical change.
Answer» D.  The powdering of sugar is a physical change.
Discussion
3.

Charcoal burning on the grill is an example of

A. physical change    
B. chemical change
C.  B, C and A
D. reversible change 
Answer» C.  B, C and A
Discussion
4.

Which of the following is an example of physical change?

A. Mixing baking soda and vinegar together, and this causes bubbles and foam.
B. A glass cup falls from the counter and shatters on the ground.
C.  Neutrons   
D. Baking a birthday cake for your mother.   
Answer» C.  Neutrons   
Discussion
5.

The melting of gold is a physical change because

A. melted gold is still gold but in different form
B. no new substance is formed in it
C. (i)(ii)(iii)(iv)FTFT 
D. All the above
Answer» E.
Discussion
6.

Which of the following are endothermic change?

A. Condensation and melting
B. Condensation and freezing
C.  P and S
D. Evaporation and freezing
Answer» D. Evaporation and freezing
Discussion
7.

Nitu mixed some iron filings with sulphur powder in a China dish. She heated the contents of China dish. What did she observe during the experiment?

A.  There was no difference in the contents of China dish before and after heating.
B.  Before heating, iron filings and sulphur powder could be seen separately but after heating the content became black.
C.  Because Q is an electrolyte that conducts electricity when it is in the molten state.
D.  Before heating, the contents were black and after heating, iron filings and sulphur could be seen separately.
Answer» C.  Because Q is an electrolyte that conducts electricity when it is in the molten state.
Discussion
8.

Few changes are given below. Mark the correct option from the codes given below.   (i) Milk is set to form curd.  (ii) Batter is steamed to form idlis.  (iii) Water is boiled to form steam.  (iv) Salt is dissolved in water to form solution.  

A.   (i) (ii) (iii) (iv)  PhysicalPhysicalChemical Chemical
B. (i) (ii) (iii) (iv)  PhysicalChemical PhysicalChemical    
C.  Chemical effect
D. (i) (ii) (iii) (iv)  PhysicalChemical Chemical Physical 
Answer» D. (i) (ii) (iii) (iv)  PhysicalChemical Chemical Physical 
Discussion
9.

Mark the incorrect statement. 

A.  Melting of wax is a physical change while burning of wax in a candle is a chemical change. 
B.  Metals expand on heating while contract on cooling. Both are physical changes.
C.  The device can be switched off easily if the switch is in the neutral lead.
D.  High and low tides in sea are the examples of non-periodic changes while growth of a tree is a periodic change. 
Answer» E.
Discussion
10.

Look at the picture given below. What kind of change is shown in the picture? Choose the correct option.

A. Irreversible change, melted wax cannot be solidified again.
B. Reversible change, melted wax can be solidified again.
C.  Can't say
D. Chemical change, melting of candle wax results in change in composition of candle.
Answer» C.  Can't say
Discussion
11.

The brown coloured deposition on an iron box when kept in humid air for some days is called:

A. Dust
B. Rust
C.  Hydrogen gas at anode and sodium hydroxide at cathode
D. All the above
E. None of these
Answer» C.  Hydrogen gas at anode and sodium hydroxide at cathode
Discussion
12.

Name the gas which is produced when washing soda reacts with lemon juice.

A. Oxygen  
B. Nitrogen
C.  Nitrogen, chlorine and chromium
D. Carbon dioxide
E. None of these
Answer» E. None of these
Discussion
13.

Which among the following is not an example of a reversible change?

A. Dissolving sugar in water.
B. Changing of wheat to flour.
C.  Manganese dioxide and powdered carbon
D. Melting of coaltar.
E. None of these
Answer» C.  Manganese dioxide and powdered carbon
Discussion
14.

A Sheela cooked rice in a rice cooker. What kind of change took place? (i) Irreversible change (ii) Endothermic change (iii) Natural change

A.  Only (i) and (ii)
B.  Only (ii) and (iii)
C. Electrolysis  
D.  (i), (ii) and (iii)
Answer» B.  Only (ii) and (iii)
Discussion
15.

DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below Assertion A: The explosion of a fire cracker sis a physical changes. Reason R: A physical change is a reversible change.

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 - incident ray), (b - normal ray), (c - reflected ray), (d - angle of reflection)
D. A is false but R is true.
Answer» E.
Discussion
16.

DIRECTIONS: Read the passage (s) given below and answer the questions that follow Passage -1 For changing milk into curd we add a small quantity of curd into milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours the milk changes into curd. The change of milk into curd is a

A. slow change
B.  fast change
C. Copper sulphate solution ? Electrolyte
D. endothermic change
Answer» B.  fast change
Discussion
17.

Which of the following is NOT true about a chemical change?

A.  It involves reactants and products.
B.  It is an irreversible change.
C. Kaleidoscope 
D.  The reactants can be retrieved by physical methods.
Answer» E.
Discussion
18.

During which of the following changes a new substance is formed?

A. Cooking
B.  Melting
C. \[{{90}^{o}}\]
D. Crushing
Answer» B.  Melting
Discussion
19.

Which of the following is an endothermic reaction?

A.  The formation of curd from milk
B.  The production of gas when quicklime is added to water
C. (i-A), (ii-C), (m-D), (iv-B)
D.  The freezing of water
Answer» B.  The production of gas when quicklime is added to water
Discussion
20.

Choose the correct alternative to complete the given analogy. Change in period in a school: Periodic change::________: Non periodic change

A. Heart beating
B. Formation of day and night
C. Concave mirror
D. Change in phases of moon
Answer» D. Change in phases of moon
Discussion
21.

Which of the following statements is true of the changes when a mixture of iron powder and sulphur powder are heated?

A.  Iron and sulphur are called the reactants.
B.  Iron and sulphur form a solution.
C. Electrolyte   
D.  A new product is formed which has all the properties of iron and sulphur.
Answer» B.  Iron and sulphur form a solution.
Discussion
22.

Which of the following is an example of chemical change?

A. Filling up a balloon with hot air.
B. Taking a glass of water and freezing it by placing it in the freezer.
C. 5 cm towards the mirror.
D. None of these
Answer» D. None of these
Discussion
23.

Making biogas from cow-dung is which kind of change?

A. Irreversible change    
B. Reversible change
C. Ray-box 
D. Either [a] or [b]
E. None of these
Answer» B. Reversible change
Discussion
24.

Which kind of change it will be, if a sac of cement gets wet completely and left in open?

A. Irreversible change  
B. Reversible change
C. Cathode
D. Desirable change
E. None of these
Answer» B. Reversible change
Discussion
25.

Sawing a piece of wood is which kind of change?

A. Reversible change   
B. Irreversible change
C. Magnetic effect
D. Periodic change
E. None of these
Answer» C. Magnetic effect
Discussion
26.

Which one of the following is NOT an undesirable change?

A.  The spoiling of food
B.  The growth of weeds
C. The bulb may be fused
D.  The curdling of milk
Answer» E.
Discussion
27.

Evaporation is

A. physical change
B. temporary change
C. Na OH solution
D. All the above
Answer» E.
Discussion
28.

Which among the following is a reversible change?  

A. Growth in plants and animals.
B. Burning of cloth.
C. expansion
D. Bursting a balloon
E. None of these
Answer» F.
Discussion
29.

Inflating a balloon is a/an _____ change.

A. Irreversible  
B. Chemical
C.  The crystallization of sugar is a chemical change.
D. Periodic
E. None of these
Answer» D. Periodic
Discussion
30.

The germination of a seed is

A.  a physical, reversible change in which energy is produced.
B.  a fast, desirable chemical reaction in which energy is released.
C. periodic change
D.  A fast, irreversible and undesirable chemical change.
Answer» D.  A fast, irreversible and undesirable chemical change.
Discussion
31.

  When carbon dioxide and water combines they form glucose, this is an example of _____ change.

A. Physical
B. Chemical
C. Lighting a piece of paper on fire and the paper bums up and leaves ashes.
D. Undesirable
E. None of these
Answer» C. Lighting a piece of paper on fire and the paper bums up and leaves ashes.
Discussion
32.

What is difference between making of furniture from wood and burning of wood?  

A. First is irreversible and second is reversible change 
B.  First is physical and second is chemical change
C. on cooling melted gold returns back to its original state
D. First is periodic and second is non-periodic change
Answer» C. on cooling melted gold returns back to its original state
Discussion
33.

Which of the following can be considered as a fast change?

A. Growth of child  
B. Germination of seed
C. Evaporation and melting
D. Cooking of food
E. None of these
Answer» D. Cooking of food
Discussion
34.

In general, metals:

A. Expand on heating 
B. Contract on heating
C.  Before heating, the iron filings and sulphur powder could not be seen separately.
D. All the above
E. None of these
Answer» B. Contract on heating
Discussion
35.

Which of the following is not required in the process of rusting?

A. Water 
B. Oxygen
C. (i) (ii) (iii) (iv)  Chemical Chemical PhysicalPhysical 
D. All the above
E. None of these
Answer» F.
Discussion
36.

Which of the following is a chemical change?

A.  The burning of magnesium wire
B.  The heating of an iron rod
C.  Composition of matter changes during a chemical change while it remains same during a physical change.
D.  The dissolving of salt in water
Answer» B.  The heating of an iron rod
Discussion
37.

Cooking of an egg in boiling water containing salt is a 

A. permanent change
B. temporary change
C. Periodic change, candle melts after an interval of an hour.
D. Both (a) and (c)
Answer» E.
Discussion
38.

Which among the following is a characteristic of physical change?

A. Involvement of great amount of heat energy.
B. Change in states.
C. Argon
D. Formation of a new substance
E. None of these
Answer» C. Argon
Discussion
39.

The change which can be reversed.

A. Chemical change
B. Physical change
C. Argon
D. Either [a] or [b]
E. None of these
Answer» C. Argon
Discussion
40.

Which of the following cannot be reversed?

A. Boiling of an egg.   
B. Folding of paper.
C. Folding up of a paper.
D. Melting of wax.
E. None of these
Answer» B. Folding of paper.
Discussion
41.

The burning of coal in air is a

A.  physical change.
B.  chemical change.
C.  Only (i) and (iii)
D.  periodic change.
Answer» C.  Only (i) and (iii)
Discussion
42.

 Study the given Venn diagram.  Identify points 1, 2 and 3. 

A. 123Melting of iceBoiling of riceBurning of a candle   
B. 123Burning of paperRusting of ironCulting of fruits   
C. A is true but R is false.
D. 123Tearing of paperEvaporation of waterMaking lemonade 
Answer» D. 123Tearing of paperEvaporation of waterMaking lemonade 
Discussion
43.

Read the given statements and mark the correct option. Statement 1: While fixing a metal rim on a wooden wheel of a cart, the size of the metal rim is kept slightly smaller than that of the wooden wheel. Statement 2: Metals expand on heating and contract on cooling.   

A.  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B.  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C. exothermic
D.  Both statements 1 and 2 are false.
Answer» B.  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
Discussion
44.

Swati classified a few changes occurring around us as shown in the table.    No. Changes Type 1. Sharpening of pencil Physical, reversible 2. Evaporation of water Physical, irreversible 3. Opening of a bud Chemical irreversible 4. Rusting of iron Chemical reversible Which of the changes is/are classified correctly? 

A.  2 and 3 only   
B.  3 and 4 only    
C.  Energy changes take place in it.
D.  3 only
Answer» E.
Discussion
45.

The change of a ball of dough to a rolled out roti is a

A. physical change
B. chemical change
C. Freezing  
D. None of these
Answer» B. chemical change
Discussion
46.

Match the column I with column II and choose the correct option from the codes given below: Column I Column II P.  Digestion of food in our body (i) Fast change Q.  Earthquake (ii) Natural, desirable change R.  Falling of stone (iii) Natural, undesirable change S. Change of   seasons  (iv) Slow change

A.  P-(iv), Q-(ii),R-(iii),S-(i)
B.  P-(iii), Q-(iv), R-(ii), S-(i)
C.  The opening of a soda bottle with production of gas
D.  P-(iv), Q-(iii), R-(i), S-(ii)
Answer» E.
Discussion
47.

A potter shapes pots out of clay (Process 1). He then bakes the pots in an oven (Process 2). Which of the following statements is correct?

A.  Process 1 is a reversible, physical change while process 2 is an irreversible, physical change.
B.  Process 1 is an irreversible, physical change while process 2 is an irreversible, chemical change.
C. Forest fire
D.  None of these.
Answer» D.  None of these.
Discussion
48.

Study the flowchart carefully. (i) Melting of ice(i) Cutting of paper(ii) Blowing of balloon(ii) Flowering of bud Which of the following is correct?

A. PQ Reversible changeReversible change   
B. PQ Irreversible changeReversible change   
C.  Iron and sulphur can be easily separated after the reaction.
D. PQ Reversible changeIrreversible change 
Answer» E.
Discussion
49.

While making chapati, Radhika observed the following changes, which among the following is a reversible change?

A. Changing of flour into dough.   
B. Rolling of chapati.
C. A plant collecting sunlight and turning it into food.
D. Eating a chapati.
E. None of these
Answer» C. A plant collecting sunlight and turning it into food.
Discussion
50.

A substance present in plants which itself does not undergo any change but helps in changing water and carbon dioxide into food.

A. Flower  
B. Bud
C. Both [a] and [b]
D. Chlorophyll
E. None of these
Answer» E. None of these
Discussion