Explore topic-wise MCQs in 7th Class.

This section includes 2637 Mcqs, each offering curated multiple-choice questions to sharpen your 7th Class knowledge and support exam preparation. Choose a topic below to get started.

751.

When a ribbon of magnesium is burnt in the air, magnesium oxide is formed. This is an example of:

A. Physical change 
B. Chemical change
C. Temporary change         
D. All the above
E. None of these
Answer» C. Temporary change         
Discussion
752.

Identify the change undergone by burning of wood.

A.  Reversible change
B.  Physical change
C.  Chemical change
D.  All of the above
Answer» D.  All of the above
Discussion
753.

Characteristic of matter exhibited without a change in its identity is:

A. physical property        
B. chemical property
C. thermal property         
D. None of these
Answer» B. chemical property
Discussion
754.

Read the given statements and select the correct option.         Statement 1: Many cut fruits, when kept in open turn brown.          Statement 2: Browning of fruits is due to a chemical reaction.

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.  Statement 1 is true and statement 2 is false.
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
755.

Method of heat transfer by which heat is transferred from sun to earth is:

A. Conduction                   
B. Vaporization
C. Radiation          
D. Convection
E. None of these
Answer» D. Convection
Discussion
756.

Chemical change that is accompanied by evolution of heat energy is:

A. physical chemical change
B. exothermic chemical change
C. endothermic chemical change
D. None of these
Answer» C. endothermic chemical change
Discussion
757.

Rupali classified a few changes occurring around us as shown in the table.             S. No. Change Chemical Physical Reversible 1. Grinding of wheat \[\times \] \[\times \] 2. Bursting of crackers \[\times \] \[\times \] 3. Formation of clouds     \[\times \] 4. Germination of seeds \[\times \] 5. Drying of wet clothes   \[\times \] \[\times \] Which of her observations are incorrect?

A.  1 and 2 only   
B.  2 and 3 only   
C.  1, 4 and 5 only
D.  All of these.    
Answer» D.  All of these.    
Discussion
758.

One litre of water at \[25{}^\circ C\] is mixed with one litre of water at \[35{}^\circ C.\] The temperature of the mixture will be:

A. \[60{}^\circ C\]
B. \[50{}^\circ C\]
C. Between \[25{}^\circ C\] and \[35{}^\circ C\]     
D. More than \[{{35}^{o}}C\]
E. None of these
Answer» D. More than \[{{35}^{o}}C\]
Discussion
759.

Identify the correct characteristic of a physical change.

A.  Permanent change
B.  Irreversible
C.  Change in composition
D.  Change in colour
Answer» E.
Discussion
760.

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

A. 123 Melting of iceRusting  of iron           Cutting a log of wood                
B. 123 Glowing of bulbBursting of tyreCrystallisation               
C. 123 Stitching of garmentsBurning a matchstickBurning of a  candle               
D. 123 Melting of iceDecomposition of sugarSublimation
Answer» D. 123 Melting of iceDecomposition of sugarSublimation
Discussion
761.

What kind of change is neutralization?

A.  A physical change
B.  A chemical change
C.  Sometimes a physical and some- times a chemical change
D.  Neither a physical nor a chemical change
Answer» C.  Sometimes a physical and some- times a chemical change
Discussion
762.

Higher kinetic energy of the molecules of the body is observed when the body is at __.

A. Lower temperature         
B. Higher temperature
C. Very low temperature     
D. All the above
E. None of these
Answer» C. Very low temperature     
Discussion
763.

Observe the given figure carefully and identify the substances marked as (p), (q) and (r).

A. (p) (g) (r)  Zinc       Water  Carbon dioxide                
B. (p) (g) (r)  Magnesium   Hydrochloric acid Oxygen                
C. (p) (g) (r)  Magnesium Water   Carbon dioxide                
D. (p) (g) (r)  Zinc        Hydrochloric acid Hydrogen
Answer» E.
Discussion
764.

Kunal took few iron turnings and mixed them well with sulphur powder. He could separate the iron turnings with the help of a magnet. He heated the mixture for some time and tried to separate the iron turnings with the magnet but he could not. Why?

A.  On heating, a chemical change takes place and a new compound is formed.
B.  On heating, iron becomes non-magnetic hence, it is not attracted by magnet.
C.  On heating, a physical change takes place hence iron and sulphur gets mixed up.
D.  On heating, iron evaporates and only sulphur is left behind.
Answer» B.  On heating, iron becomes non-magnetic hence, it is not attracted by magnet.
Discussion
765.

What kind of change is undergone by the expansion of railway tracks during summer?

A.  Irreversible, physical change
B.  Reversible, physical change
C.  Irreversible, chemical change
D.  Reversible, chemical change
Answer» C.  Irreversible, chemical change
Discussion
766.

Observe the given experimental set-up carefully. In which test tubes rusting of iron nails will not take place?                                                    

A. P and Q only             
B.  Q and R only
C. P and R only   
D. All of these
Answer» B.  Q and R only
Discussion
767.

Which of the following is NOT a property of physical change?

A.  Change in state and colour
B.  Change in composition
C.  Temporary change
D.  Reversible change
Answer» C.  Temporary change
Discussion
768.

A way of transferring heat from hot body to cold body which do not require any material medium is:

A. Convection                   
B. Conduction
C. Radiation          
D. Reflection
E. None of these
Answer» D. Reflection
Discussion
769.

Observe the given reaction carefully and fill in the blanks by choosing an appropriate option.\[F{{e}_{(s)}}+CuS{{O}_{4(aq)}}\to FeS{{O}_{4(aq)}}+C{{u}_{(s)}}\]Before reaction, iron is ___(i)___ in colour and solution is ___(ii)___ in colour. After reaction iron gets ___(iii)___ deposits and the solution becomes ___(iv)___ in colour. 

A. (i)(ii)(iii)(iv) GreyColourlessRedBlue                
B. (i)(ii)(iii)(iv) RedBlueGreyGreen               
C. (i)(ii)(iii)(iv) GreyBlueBrownGreen               
D. (i)(ii)(iii)(iv) RedColourlessGreyGreen 
Answer» D. (i)(ii)(iii)(iv) RedColourlessGreyGreen 
Discussion
770.

Which of the following properties of iron is NOT a physical property?

A.  Electrical conductivity
B.  Magnetic property
C.  Good conductor of heat
D.  Reaction with moisture to get rusted
Answer» E.
Discussion
771.

Which of the following do not represent that a chemical change is taking place? I. A gas is produced.                 II. Precipitate is formed.                III. State of a substance changes IV. A new odour is produced. V. Shape of a substance changes

A.  I and V only    
B.  I and IV only
C.  II, III and V only
D.  III and V only
Answer» E.
Discussion
772.

DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Which portion of a ship shown below will rust the fastest?

A. A
B. B and C
C. C
D. A, B and C will get rust equally
Answer» D. A, B and C will get rust equally
Discussion
773.

DIRECTIONS: On the basis of following diagram/picture answer the questions given below: What causes the candle flame to get extinguished?

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 \[\text{CaC}{{\text{l}}_{\text{2}}}\]
Answer» C. Formation of \[\text{Ca}{{\left( \text{OH} \right)}_{\text{2}}}\]
Discussion
774.

Ice is covered with a jute cloth to slow the process of melting because:

A. It is harsh to touch.
B. It is a poor conductor of heat.
C. Ice can be wrapped in it easily.
D. Ice becomes light when covered with jute.
E. None of these
Answer» C. Ice can be wrapped in it easily.
Discussion
775.

Which of the following changes is accompanied by sound?

A. Photosynthesis
B. Spoilage of food
C. Explosion of fire works
D. None of these
Answer» D. None of these
Discussion
776.

DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Three substances given below are kept in the open for a few days and some changes were observed. Which of the substances will show chemical changes?

A. Eggs
B. Plastic bottle
C. Both eggs & moth balls
D. All eggs, plastic bottle and moth balls
Answer» B. Plastic bottle
Discussion
777.

DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In an experiment a painted iron nail was placed into a beaker containing sea water (Fig 'A'). The beaker was left undisturbed for about 10 days. After 10 days, the nail began to rust (Fig 'B') which of the following statements is/are correct?               (i) Poor quality paint was used to paint iron nail. (ii) Oxygen and water cause rusting. (iii) Presence of salts in sea water enables rust formation faster.

A.  (i) only                       
B.  (ii) only
C.  (iii) only        
D.  (ii) and (iii)
Answer» E.
Discussion
778.

DIRECTIONS: Read the following three statements and choose the correct answer. (i) Burning of magnesium ribbon is an endothermic reaction. (ii) Magnesium on burning in air forms ash. (iii) Ash formed on burning of magnesium ribbon is magnesium dioxide.

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
Answer» B. Statement (i) and (ii) are incorrect but (iii) is correct
Discussion
779.

DIRECTIONS: Read the following three statements and choose the correct answer. (i) Cooking of rice is a physical change. (ii) Pasteurization of milk is a chemical change (iii) Iron pipes coated with zinc do not get rusted easily

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
Answer» C. All statements are correct
Discussion
780.

DIRECTIONS: Read the following three statements and choose the correct answer. (i) A few drops of petrol poured on to your palm will feel cool, because it involves evolution of heat. (ii) Burning of a petrol is an exothermic reaction. (iii) Neutralization reaction is an endothermic change.

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
Answer» B. Statement (i) and (ii) are incorrect but (iii) is correct
Discussion
781.

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): Conversion of oxygen to ozone is a chemical change. Reason (R): Ozone acts as a protective shield and protects us from harmful radiation of the sun.

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.
Answer» C. A is true but R is false.
Discussion
782.

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): Respiration is an exothermic process. Reason (R): In an exothermic process heat is evolved.

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.
Answer» C. A is true but R is false.
Discussion
783.

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): Breaking of a bone china plate is a physical change. Reason (R): When a bone china plate breaks, the pieces cannot be joined to get back the original plate.

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.
Answer» D. A is false but R is true.
Discussion
784.

Match the following: Column A Column B (i) Solids [A] Doctor?s thermometer (ii) Gases [B] Radiation (iii) Vacuum [C] Conduction (iv) Kink [D] Convection

A. (i - C), (ii - D), (iii - B), (iv - A)     
B. (i - C), (ii - B), (iii - D), (iv - A)
C. (i - C), (ii - A), (iii - D), (iv - B)      
D. (i - D), (ii - C), (iii - B), (iv - A)
E. None of these
Answer» B. (i - C), (ii - B), (iii - D), (iv - A)
Discussion
785.

Expansion on heating and contraction on cooling of metals is a:

A. chemical change         
B. physical change
C. irreversible change      
D. None of these
Answer» C. irreversible change      
Discussion
786.

Study the given figure carefully. Which of the following reactions explains the above change most appropriately?  

A. \[ZnS{{O}_{4}}+Cu\to CuS{{O}_{4}}+Zn\]
B. \[CuS{{O}_{4}}+Fe\to FeS{{O}_{4}}+Cu\]
C. \[FeS{{O}_{4}}+Cu\to CuS{{O}_{4}}+Fe\]
D. \[CuS{{O}_{4}}+Zn\to ZnS{{O}_{4}}+Cu\]
Answer» C. \[FeS{{O}_{4}}+Cu\to CuS{{O}_{4}}+Fe\]
Discussion
787.

The reason for a physical change to be named as such is that the:

A. change occurs only in physical properties
B. transfer of energy takes place
C. is a reversible change
D. All of the above
Answer» B. transfer of energy takes place
Discussion
788.

What kind of change does sodium chloride undergo when it is added to water?

A.  Physical change
B.  Chemical change
C.  Chemical reaction
D.  Temporary change
Answer» B.  Chemical change
Discussion
789.

Which is not a unit of measuring temperature?

A. Kelvin               
B. Celsius    
C. Pascal              
D. Fahrenheit
E. None of these
Answer» D. Fahrenheit
Discussion
790.

In a pressure-kerosene stove,           (i) We pump kerosene and convert it into vapours.                          (ii) The vapours are then ignited.       Which of the following is true about the above statements?                    

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.
Answer» C.  Both (i) and (ii) are physical changes.
Discussion
791.

What kind of change does a glowing electric bulb undergo?

A.  Physical change
B.  Chemical change
C.  Irreversible change
D.  Undesirable change
Answer» B.  Chemical change
Discussion
792.

Name the term used for accumulation of wastes in the soil generated by human activity that alter the features of soil.

A. Percolation                    
B. Soil erosion
C. Soil pollution     
D.        Soil precaution
E. None of these
Answer» D.        Soil precaution
Discussion
793.

Choose the correct order for the particle sizes of different types of soil.

A. Sand > gravel > silt > clay
B. Clay > gravel > sand > silt
C. Gravel > clay > sand > silt
D. Gravel > sand > silt > clay
E. None of these
Answer» E. None of these
Discussion
794.

Which of the following is mostly used for road construction?

A. Clay                             
B. Gravel
C. Silt                   
D.        Loam
E. None of these
Answer» C. Silt                   
Discussion
795.

Which soil is also known as ?Khadar??

A. Red soil            
B. Black soil
C. Alluvial soil
D.        Desert soil
E. None of these
Answer» D.        Desert soil
Discussion
796.

___ is the uppermost fertile layer of earth crust.

A. Mineral             
B. Metal
C. Bed rock           
D.        Topsoil
E. None of these
Answer» E. None of these
Discussion
797.

Minimum percolation of water is seen in:

A. Loamy soil                    
B. Clayey soil
C. Sandy soil         
D.        Silt soil
E. None of these
Answer» C. Sandy soil         
Discussion
798.

Reyansh wants to prepare some toys and statues by using soil. Which type of soil he should use for this purpose?

A. Sandy soil                     
B. Siltysoil
C. Gravel soil        
D.        Clayey soil
E. None of these
Answer» E. None of these
Discussion
799.

In waste water treatment useful products obtained are:

A. Biogas              
B. Sludge
C. Aerobic bacteria
D.        Both [a] and [b]
E. None of these
Answer» E. None of these
Discussion
800.

Unweathered solid rocks are present in:

A. B - horizon                    
B. A - horizon
C. R - horizon
D.        C - horizon
E. None of these
Answer» D.        C - horizon
Discussion