You can prepare for your class 10 cbse board exam with all of these mcq questions for class 10 science. You will also get here important mcq questions for class 10 science cbse pdf with answers.
mcq questions for class 10 science
Q. 1 ) Identify the type of reaction in the following experiment:
(I) Combination Reaction
(II) Decomposition Reaction
(III) Exothermic Reaction
(IV) Endothermic Reaction
(a) Only (I) (b) Only (II)
(c) Both (I) and (III) (d) Both (II) and (IV)
Answer : (c) Both (I) and (III)
Explanation: The reaction between calcium oxide and water is a combination reaction as the two compounds combine to form a single product slaked lime, Ca(OH)2 and the equation of the reaction taking place is: CaO(s) + H2O(l) Ca(OH)2(aq) + Heat It is also an exothermic reaction as a large amount of heat is released during this reaction.
Q.2) A few drops of phenolphthalein indicator were added to an unknown solution A and it acquired pink colour. Then another unknown solution B was added to it drop by drop and the solution becomes colorless. Which of the given options correctly represents the nature of the solutions A and B?
| Option | nature of solution A | nature of solution B |
| (a) | acidic | basic |
| (b) | basic | neutral |
| (c) | basic | acidic |
Answer: (c) Nature of solution A Basic; Nature of Solution B: Acidic
Explanation: The solution A is basic as it acquired a pink colour when a few drops of phenolphthalein indicator were added to it. Since the solution became colourless on adding few drops of B to this solution, the solution B is acidic in nature as a neutralization reaction takes place between acid and base.
mcq questions for class 10science chemistry chapter 1
Q.3) Study the given diagram explaining the formation of rainbow in the sky:
Select the correct statements w.r.t. the diagram above.
(a) Dispersion occurs at point A
(b) Internal refraction occurs at point B
(c)Internal reflection occurs at point A
(e) Dispersion occurs at point B
Answer: (a) Dispersion occurs at point A
Explanation: At point A, dispersion occurs
while at point B internal reflection occurs.
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Q.4) Which colour of light is mainly scattered by large sized particles?
1) blue
2) Red
3) White
4) Violet
Answer: (c) White
Explanation: If the size of particles scattering the light is large enough, the scattered light may even appear white.
Q.5) Dispersion of light takes place by a glass prism because
1) the light of different colours have different intensities.
2) the light of different colours have different energies.
3) the light of different colours have different speed in a medium.
4) different colours have different frequencies.
Answer: (c) the light of different colours have different speed in a medium.
Explanation: A prism works because the different colours of light travel at different speeds inside the glass. Because the colours of light travel at different speeds, they get bent by different amounts and come out all spread out instead of mixed up.
mcq questions for class 10 science term 1
Q.6) Planets do not twinkle because
(a) Planets are not a source of light.
(b) The shift in their position (as compared to stars) is smaller.
(c) they reflect high intensity light reaching them.
(d) both (a) and (b) are true.
Answer: (d) both (a) and (b)
Explanation: Planets do not twinkle because:
(1) Planets are not a source of light. Instead, they reflect low intensity light reaching them.
(2) They are also closer to the Earth than the distant stars. Hence, the shift due to atmospheric refraction is smaller.
(3) As the planets are closer, planets appear larger in comparison to the stars. Hence, the shift is not enough for the planets to twinkle.
Q.7) Shreya is at the distance 15 cm moves slowly towards the pole of a convex mirror. What will be the image in the mirror?
(a) shortened and real
(b) enlarged and real
(c) enlarged and virtual
(d) diminished and virtual
Answer: diminished and virtual
Explanation: Convex mirror always form virtual and diminished image irrespective of position of the object in front of mirror.
Q.8) A light ray from medium A to medium B as shown in the given figure. The refractive index of medium B relative to medium A is:
(a) more then one
(b) less than one
(c) one
(d) zero
Answer: less than one
Explanation: In medium B, light ray bends
away from normal. It indicates, medium B is
optically rarer than medium A. Thus, speed of
light in medium B is more than in medium A.
mcq questions for class 10 science cbse
Q. 9) Harsh is standing in front of a unique mirror he finds the image of head smaller the
middle portion of her body of the same size
and that of the legs bigger. Which of the
following is the order of combination for
such mirror from the top?
(a) plane, convex and concave
(b) concave, plane and convex
(c) convex, plane and concave
(d) convex concave and plane
Answer: (b) Concave, plane and convex
Explanation: In concave mirror, virtual image
is enlarged and erect. In convex mirror, virtual
image formed is diminished and in plane
mirror, virtual image formed is of same size as
the object.
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Q. 10) Study the ray diagram given below and select the correct option.
(a) Parallel to the incident ray
(b) Pass through F
(c) Appear to diverge from F
(d) Appear to diverge from C
Answer: . (c) Appear to diverge from F
Explanation: A ray of light parallel to the
principal axis appears to diverge from the
principal focus F after reflection from a convex
mirror.
Q. 11) What is the final product of protein,
carbohydrate and fat digestion?
(a) Protein – Ammonia
Fats – Fatty Acid + Glycerol
Carbohydrates – Glucose
(b) Protein – Amino acid
Fats – Fatty Acid
Carbohydrates – maltose
(c) Protein – Amino acid
Fats – Fatty Acid + Glycerol
Carbohydrates – Glucose
(d) Protein – Ammonia
Fats – Chylomicrons
Carbohydrates – Glucose
Answer: (c) Protein – Amino acid
Fats – Fatty Acid + Glycerol
Carbohydrates – Glucose
Explanation: The final product of protein
digestion is amino acids, carbohydrate
digestion is glucose and fats digestion is fatty
acids and glycerol
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Q. 12)Carefully study the diagram of the human heart with labels (I), (II), (III) and (IV). Select the option which gives correct identification and its main function.
(a) (I) Pulmonary artery: Carry oxygenated blood from heart to lungs
(b) (II) Pulmonary veins: Carry oxygenated blood from lungs to the heart
(c) (III) Aorta: Carry deoxygenated blood from heart to lungs
(d) (IV) Vena Cava: Carry oxygenated blood from body parts to heart
Answer: (b) (II) Pulmonary veins: Carry oxygenated blood from lungs to the heart.
Explanation: Pulmonary artery carries
deoxygenated blood from the heart to the
lungs; Aorta carries oxygenated blood from
the heart to the body parts and vena cava
carries deoxygenated blood from various body
parts to the heart from where it is carried to
the lungs for purification.
Q. 13) Which of the following factors influence
ascent of sap?
(I) Root Pressure
(II) Diffusion
(III) Osmotic Pressure
(IV)Transpiration Pull
(V) Turgor pressure
(a) (I), (III), (IV), (V)
(b) (I), (IV), (V)
(c) (III), (IV), (V)
(d) (I), (IV)
Answer: (d) (I), (IV)
Explanation: Various factors responsible of
ascent of sap are capillarity, Root pressure and
Transpiration pull.
Q. 14) Rings of cartilage, in the throat prevents:
(a) Collapsing of air passage.
(b) Entering of food in wind pipe.
(c) Bacterial infection in the tract.
(d) Entering of microbes.
Answer: (a) collapsing of air passage
Explanation: Rings of cartilage are present in
the throat as it helps the throat from collapsing
when there is a low amount of air present.
class 10 mcq science
Q. 15) When do the desert plants take up carbon dioxide?
(a) During early morning
(b) During day
(c) During night
(d) All the time
Answer: (c) During night
Explanation: Desert plants open up their
stomata during night and take in CO2. Stomata
remains close during the day time to prevent
the loss of water by transpiration. They store
the CO2 until the sun comes out and they can
carry on with photosynthesis during the day
time.
Q. 16) Select the correct statments w.r.t. bases:
(I) Bases have bitter taste and soapy touch.
(II) With carbon dioxide, they form salt and water.
(III) The gas evolved with zinc metal
extinguishes a lightning splinter.
(a) Statements (I) and (III) are correct
(b) Only Statement (I) is correct
(c) Statement (I) and (II) are correct
(d) Only statement (II) correct
Answer: (c) Statement A and B are correct
Explanation: Bases are bitter in taste and
have a soapy touch. Carbon dioxide is acidic
in nature. So, it produces acidic salt and water
with the bases. Hydrogen gas is evolved by the
reaction of zinc with bases. This gas does not
extinguish a lightning splinter.
Q. 17) Soda acid extinguisher contains the chemical:
(a) NaHCO3
(b) Na(OH)
(C) Na2CO3
(d) NaCl
(a) NaHCO3
Explanation: Sodium hydrogen carbonate
(NaHCO3) is used as soda-acid fire extinguisher.
Q. 18) Which component is being reduced in the reaction ?
CuO + H2 ∆ → Cu + H2O
(a) Cu
(b) H2
(c) CuO
(d) Both CuO and H2
Answer:(c) CuO
Explanation: CuO is getting reduced to metallic
Cu by loosing its oxygen.
mcq questions for class 10 science chemistry
Q. 19) Packed food items made up of oils and fats are generally flushed with inert gas :
(I) To protect them from corrosion.
(II) They protect their flavours.
(III) To protect them from being rancid.
(IV)To protect their taste.
Which of the following statements are
correct?
(a) (II), (III), (IV) (b) (III) and (IV)
(c) only (III) (d) (I) and (II)
Answer: (a) (II), (III), (IV)
Explanation: Nitrogen gas is an antioxidant,
which prevents food from being oxidised. When
fats and oils are oxidised, they become rancid
and their smell and taste changes.
Q. 20) Which of the following is acidic in nature?
(a) Milk
(b) Human blood
(c) Lime water
(d) Laundary detergents
Answer: (a) Milk
Explanation: Milk is an acid-forming food as it
contains lactic acid. It has a pH of 6 (approx).
