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CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download for Students
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:
(a) Mg
(b) Na
(c) P
(d) Ca
Option b – Na
Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
(a) Has high melting point
(b) Has low melting point
(c) Conducts electricity in molten state
(d) Occurs as solid
Option b – Has low melting point
The electronic configurations of three elements X, Y, and Z are X-2, 8; Y – 2, 8, 7; and Z – 2, 8, 2. Which of the following is correct? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Option d – Y is a non-metal and Z is a metal
Amalgam is an alloy of:
(a) Copper and Tin
(b) Mercury
(c) Lead and Tin
(d) Copper and Zinc
Option b – Mercury
Copper objects lose their shine and form a green coating of: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Copper oxide
(b) Copper hydroxide and Copper oxide
(c) Basic Copper carbonate
(d) Copper carbonate
Option c – Basic Copper carbonate
Bronze is an alloy of:
(a) Copper and Zinc
(b) Aluminium and Tin
(c) Copper, Tin, and Zinc
(d) Copper and Tin
Option d – Copper and Tin
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
I. MgO
II. ZnO
III. Al₂O₃
IV. CaO
(a) I and II
(b) II and III
(c) III and IV
(d) I and IV
Option b – II and III
The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?
(a) He
(b) Ar
(c) Ne
(d) Kr
Option c – Ne
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting
Option c – Calcination
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
(a) Aluminium as reducing agent
(b) Sodium as reducing agent
(c) Carbon as reducing agent
(d) Calcium as reducing agent
Option c – Carbon as reducing agent
In thermite welding, a mixture of ………. and ……… is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved. ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Iron (III) oxide and aluminium powder
(b) Iron (II) oxide and aluminium powder
(c) Iron (III) chloride and aluminium powder
(d) Iron (III) sulphate and aluminium powder
Option a – Iron (III) oxide and aluminium powder
Galvanisation is a method of protecting iron from rusting by coating with a thin layer of:
(a) Gallium
(b) Aluminium
(c) Zinc
(d) Silver
Option c – Zinc
Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity
Option a – Sonorousness
What is the product of the reaction: Al₂O₃ + 2NaOH + H₂O?
(a) Al(OH)₃
(b) Na₂O
(c) NaAlO₂
(d) AlNaO₂
Option c – NaAlO₂
Which of the following is the correct arrangement of the given metals in descending order of their reactivity?
Zinc, Iron, Magnesium, Sodium
(a) Zinc > Iron > Magnesium > Sodium
(b) Sodium > Magnesium > Iron > Zinc
(c) Sodium > Zinc > Magnesium > Iron
(d) Sodium > Magnesium > Zinc > Iron
Option d – Sodium > Magnesium > Zinc > Iron
Which of the following pairs will give displacement reactions? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) FeSO₄ solution and Copper metal
(b) AgNO₃ solution and Copper metal
(c) CuSO₄ solution and Silver metal
(d) NaCl solution and Copper metal
Option b – AgNO₃ solution and Copper metal
Non-metals form covalent chlorides because:
(a) They can give electrons to chlorine atoms.
(b) They can share electrons with chlorine atoms.
(c) They can give electrons to chlorine atoms to form chloride ions.
(d) They cannot share electrons with chlorine atoms.
Option b – They can share electrons with chlorine atoms
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) FeO
(b) Fe₂O₃
(c) Fe₃O₄
(d) Fe₂O₃ and Fe₃O₄
Option c – Fe₃O₄
Which of the following are not ionic compounds?
(i) KCl
(ii) HCl
(iii) CCl₄
(iv) NaCl
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
The electronic configuration of three elements X, Y, and Z are as follows: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
X = 2, 4
Y = 2, 7
Z = 2, 1
Which two elements will combine to form an ionic compound, and what is the correct formula?
(a) X₂Y
(b) ZY
(c) XZ₃
(d) Y₂Z
Option b – ZY
The highly reactive metals like Sodium, Potassium, Magnesium, etc., are extracted by:
(a) Electrolysis of their molten chloride
(b) Electrolysis of their molten oxides
(c) Reduction by aluminium
(d) Reduction by carbon
Option a – Electrolysis of their molten chloride
Which of the following non-metals is lustrous? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Sulphur
(b) Oxygen
(c) Nitrogen
(d) Iodine
Option d – Iodine
Example of an amphoteric oxide is:
(a) Na₂O
(b) K₂O
(c) Al₂O₃
(d) MgO
Option c – Al₂O₃
Which one among the following is an acidic oxide? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Na₂O
(b) CO
(c) CO₂
(d) Al₂O₃
Option c – CO₂
The compound obtained on reaction of iron with steam is/are:
(a) Fe₂O₃
(b) Fe₃O₄
(c) FeO
(d) Fe₂O₃ and Fe₃O₄
Option b – Fe₃O₄
An element ‘X’ reacts with O₂ to give a compound with a high melting point. This compound is also soluble in water. The element ‘X’ is likely to be: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Iron
(b) Calcium
(c) Carbon
(d) Silicon
Option b – Calcium
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Option d – (i) and (iv)
The most abundant metal in the earth’s crust is: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium
Option b – Aluminium
The poorest conductor of heat among metals is:
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Option a – Lead
The first member of the alkyne homologous series is: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Propyne
(b) Ethyne
(c) Methane
(d) Ethene
Option b – Ethyne
In diamond, each carbon atom is bonded to four other carbon atoms to form:
(a) A hexagonal array
(b) A rigid three-dimensional structure
(c) A structure in the shape of a football
(d) A structure of a ring
Option b – A rigid three-dimensional structure
When sodium hydrogen carbonate is added to ethanoic acid, a gas evolves. Consider the following statements about the gas evolved: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(A) It turns lime water milky.
(B) It is evolved with a brisk effervescence.
(C) It has a smell of burning sulphur.
(D) It is also a by-product of respiration.
The correct statements are:
(a) (A) and (C) only
(b) (B) and (D) only
(c) (A), (C), and (D)
(d) (A), (B), and (D)
Option d – (A), (B), and (D)
Which of these series can be classified as homologous series?
(a) CHCl₃, C₂H₅OH, C₃H₇OH
(b) CH₃OH, C₂H₅OH, C₃H₇OH
(c) CHCl₃, C₄H₉OH, CH₃COOH
(d) CH₃COOH, CH₂OH, C₂H₅OH
Option b – CH₃OH, C₂H₅OH, C₃H₇OH
Why are the compounds CH₃OH, C₂H₅OH, C₃H₇OH, and C₄H₉OH grouped as a homologous series? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Because of an increase in the number of carbon atoms along the series.
(b) Because of an increase in the number of hydrogen atoms along the series.
(c) Because of the presence of the same functional group substituting hydrogen in the carbon chain.
(d) Because of the presence of the same carbon compounds substituting hydrogen in the carbon chain.
Option b – Because of an increase in the number of hydrogen atoms along the series
The number of structural isomers of pentane is:
(a) 2
(b) 3
(c) 4
(d) 5
Option d – 5
Why does carbon form compounds mainly by covalent bonding?
(a) There are four electrons in the outermost shell of carbon.
(b) It requires a large amount of energy to form C⁴⁺ or C⁴⁻.
(c) It shares its valence electrons to complete its octet.
(d) All the above.
Option d – All the above
Which of the following belongs to the homologous series of alkynes? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) C₆H₆
(b) C₂H₂
(c) C₂H₆
(d) C₃H₄
Option d – C₃H₄
A hydrocarbon has four carbon atoms. Give its molecular formula if it is an alkene:
(a) C₄H₁₀
(b) C₄H₈
(c) C₄H₆
(d) C₄H₄
Option b – C₄H₈
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that: ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) The food is not cooked completely
(b) The fuel is not burning completely
(c) The fuel is wet
(d) The fuel is burning completely
Option b – The fuel is not burning completely
The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound?
(a) 1
(b) 2
(c) 4
(d) 6
Option c – 4
Which of the following statements are correct for carbon compounds? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(i) Most carbon compounds are good conductors of electricity.
(ii) Most carbon compounds are poor conductors of electricity.
(iii) Force of attraction between molecules of carbon compounds is not very strong.
(iv) Force of attraction between molecules of carbon compounds is very strong.
Choose the correct options:
(a) (ii) and (iv)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (i) and (iii)
Option b – (ii) and (iii)
C₃H₈ belongs to the homologous series of:
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cycloalkanes
Option c – Alkanes
Name the tube which connects the kidneys to the urinary bladder. ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Urethra
(b) Nephron
(c) Tubule
(d) Ureter
Option d – Ureter
Which part of nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts, and water into the blood capillaries?
(a) Tubule
(b) Glomerulus
(c) Bowman’s capsule
(d) Ureter
Option a – Tubule
Where is the dirty blood in our body filtered? ( CBSE MCQ for Class 10 Science Chapter Wise with Answers PDF Free Download )
(a) Heart
(b) Lungs
(c) Ureter
(d) Kidneys
Option d – Kidneys
The procedure used for cleaning the blood of a person by separating urea from it is called:
(a) Osmosis
(b) Filtration
(c) Dialysis
(d) Double circulation
Option c – Dialysis
Which is the correct sequence of body parts in the human alimentary canal?
(a) Mouth → stomach → small intestine → large intestine → oesophagus
(b) Mouth → oesophagus → stomata → small intestine → large intestine
(c) Mouth → stomach → oesophagus → small intestine → large intestine
(d) Mouth → oesophagus → stomach → large intestine → small intestine
Option b – Mouth → oesophagus → stomata → small intestine → large intestine
Identify the correct path of urine in the human body.
(a) Kidney → urinary bladder → urethra → ureter
(b) Urinary bladder → ureter → kidney → urethra
(c) Kidney → ureter → urethra → urinary bladder
(d) Kidney → ureter → urinary bladder → urethra
Option d – Kidney → ureter → urinary bladder → urethra
Opening and closing of stomata is due to:
(a) High pressure of gases inside the cells
(b) Movement of water in and out of the guard cells
(c) Stimulus of light in the guard cells
(d) Diffusion of CO₂ in and out of the guard cells
Option b – Movement of water in and out of the guard cells
One of the events that does not occur during photosynthesis is:
(a) Chlorophyll absorbs solar energy
(b) Carbon dioxide is released during the process
(c) Oxygen is released during the process
(d) Carbon dioxide is absorbed during the process
Option b – Carbon dioxide is released during the process
Water in the root enters due to:
(a) The function of the root to absorb water
(b) Difference in the concentration of ions between the root and the soil
(c) Excess water present in the soil
(d) Diffusion of water in the roots
Option d – Diffusion of water in the roots
A blood vessel which pumps the blood from the heart to the entire body:
(a) Artery
(b) Capillary
(c) Vein
(d) Haemoglobin
Option a – Artery
Name a circulatory fluid in the human body other than blood.
(a) Platelets
(b) RBC
(c) Lymph
(d) Plasma
Option c – Lymph
Single circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by which of the following?
(a) Hyla, Rana, Draco
(b) Whale, Dolphin, Turtle
(c) Labeo, Chameleon, Salamander
(d) Hippocampus, Exocoetus, Anabas
Option d – Hippocampus, Exocoetus, Anabas
In amoeba, food is digested in the:
(a) Food vacuole
(b) Mitochondria
(c) Pseudopodia
(d) Chloroplast
Option a – Food vacuole
Which of the following events in the mouth cavity will be affected if salivary amylase is lacking in the saliva?
(a) Starch breaking down into sugars
(b) Proteins breaking down into amino acids
(c) Absorption of vitamins
(d) Fats breaking down into fatty acids and glycerol
Option a – Starch breaking down into sugars
Which region of the alimentary canal absorbs the digested food?
(a) Stomach
(b) Small intestine
(c) Large intestine
(d) Liver
Option b – Small intestine
The contraction and expansion movement of the walls of the food pipe is called:
(a) Translocation
(b) Transpiration
(c) Peristaltic movement
(d) Digestion
Option c – Peristaltic movement
When a few drops of iodine solution are added to rice water, the solution turns blue-black in color. This indicates that rice water contains:
(a) Fats
(b) Complex proteins
(c) Starch
(d) Simple proteins
Option c – Starch
The exit of unabsorbed food material is regulated by:
(a) Liver
(b) Anus
(c) Small intestine
(d) Anal sphincter
Option d – Anal sphincter
What are the products obtained by anaerobic respiration in plants?
(b) Carbon dioxide + Water + Energy
(c) Ethanol + Carbon dioxide + Energy
(d) Pyruvate
Option c – Ethanol + Carbon dioxide + Energy
The breakdown of pyruvate to give carbon dioxide, water, and energy takes place in:
(a) Cytoplasm
(b) Mitochondria
(c) Chloroplast
(d) Nucleus
Option b – Mitochondria
Glycolysis process occurs in which part of the cell?
(a) Cytoplasm
(b) Nucleus
(c) Mitochondria
(d) Chloroplast
Option a – Cytoplasm
Name the substances whose build-up in the muscles during vigorous physical exercise may cause cramps:
(a) Ethanol + Carbon dioxide + Energy
(c) Carbon dioxide + Water + Energy
(d) Pyruvate
Name the pores in a leaf through which respiratory exchange of gases takes place:
(a) Lenticels
(b) Vacuoles
(c) Xylem
(d) Stomata
Option d – Stomata
The respiratory pigment in human beings is:
(a) Carotene
(b) Chlorophyll
(c) Haemoglobin
(d) Mitochondria
Option c – Haemoglobin
Which plant tissue transports water and minerals from the roots to the leaf?
(a) Xylem
(b) Phloem
(c) Collenchyma
(d) Parenchyma
Option a – Xylem
The movement of food in phloem is called:
(a) Translocation
(b) Transpiration
(c) Evaporation
(d) Respiration
Option b – Transpiration
Which of the following are energy foods?
(a) Carbohydrates and fats
(b) Proteins and mineral salts
(c) Vitamins and minerals
(d) Water and roughage
Option a – Carbohydrates and fats
In which mode of nutrition does an organism derive its food from the body of another living organism without killing it?
(a) Saprotrophic nutrition
(b) Parasitic nutrition
(c) Holozoic nutrition
(d) Autotrophic nutrition
Option b – Parasitic nutrition
The mode of nutrition found in fungi is:
(a) Parasitic nutrition
(b) Holozoic nutrition
(c) Autotrophic nutrition
(d) Saprotrophic nutrition
Option d – Saprotrophic nutrition
Roots of the plants absorb water from the soil through the process of:
(a) Diffusion
(b) Transpiration
(c) Osmosis
(d) None of these
Option c – Osmosis
The site of photosynthesis in the cells of a leaf is:
(a) Chloroplast
(b) Mitochondria
(c) Cytoplasm
(d) Protoplasm
Option a – Chloroplast
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