Get complete Mcq question for class 10 science biology with answers pdf download. Start your MCQ question practice now
mcq question for class 10 science
Q. 1) Magnification produced by a rear view
mirror fitted in vehicles:
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one
depending upon the position of the
object in front of it.
Answer: (a) is less than one
Explanation: Convex mirror is used as a rear
view mirror in vehicles. It forms virtual, erect
and diminished images of the objects.
As magnification is defined as the ratio of the
height of the image to the height of the object,
hence, magnification produced by a rear view
mirror, fitted in vehicles is less than one.
Q. 2) An object is placed at a distance of 10 cm in front of a plane mirror, then the distance of image from mirror is:
(a) 5 cm (b) 10 cm
(c) 20 cm (d) 0
Answer:(b) 10 cm
Explanation: The distance of image is equal to
the distance of object in plane mirror.
Rise of Nationalism in Europe Class 10 very short one mark Questions and Answers
mcq questions for class 10 biology cbse
Q. 3) At noon the sun appears white as
(a) Red light is least scattered
(b) Red light is scattered the most
(c) Blue colour is scattered the most
(d) Blue colour is scattered the least
Answer: (d) Blue colour is scattered the least
Explanation: Sun appears white at noon as
only a little of the blue and violet lights are
scattered.
Q. 4) Plaster of Paris is hardened by:
(a) Combining with water
(b) Due to formation of gypsum(c) Due to formation of slaked lime
(d) Both (a) and (b)
Answer: (d) Both (a) and (b)
Explanation: Plaster of Paris is hardened by
combining with water. On mixing with water
it changes to gypsum giving a hard solid mass.
CaCO2
1
2
H2O + 11
2
H2O → CaSO4.2H2O
mcq questions for class 10 science cbse term 1
Q. 5) Oxides of which of the following metals are amphoteric oxides?
(I) Fe (II) Al
(III) Zn (IV)Mn
(a) Both (I) and (II)
(b) Both (II) and (III)
(c) Both (I) and (IV)
(d) Both (II) and (IV)
Answer: (b) Both (II) and (III)
Explanation: The metal oxides show both acidic and basic nature are known as amphoteric oxides. For ex, aluminium oxide and zinc oxide are amphoteric oxides.
The reaction of aluminium oxide with acids
and bases is given below:
Al2O3 + 6HCl → 2AlCl3 + 3H2O
Al2O3 + 2NaOH → 2NaAlO2 + H2O
mcq questions for class 10
Q. 6) Common salt conducts electricity in molten state, because :
(a) Na+ and Cl– free to move in molten state but not in solid state
(b) Na+ and Cl– free to move in solid state but not in molten state
(c) Na+ and Cl– free to move in gaseous state but not in solid state
(d) Na+ and Cl– needs force to move in gaseous state
Answer: (a) Na+ and Cl– are free to move in molten state but not in solid state.
Explanation: In molten state, free electrons are
present which conducts electricity.
Gastric juices released during digestion is
slightly acidic. Therefore, its pH is less than 7
Q. 7) The pH of the gastric juices released during digestion is:
(a) equal to 0
(b) equal to 7
(c) less than 7
(d) more than 7
Answer: (c) Less than 7.
Explanation: Gastric juices released during
digestion is slightly acidic. Therefore, its pH is
less than 7
mcq questions for class 10 science cbse
Q. 8) Baking powder is a mixture of:
(a) sodium carbonate and ethanoic acid
(b) sodium hydrogen cabonate and ethanoic
acid
(c) sodium carbonate and tartaric acid
(d) sodium hydrogen carbonate and tartaric
acid
Answer: (d) sodium hydrogen carbonate and tartaric acid
Q. 9) The part of alimentary canal that receives bile from the liver is:
(a) Oesophagus
(b) Stomach
(c) Small intestine
(d) Large intestine
Answer: (c) Small intestine
Explanation: The small intestine receives bile
from the liver. This bile is later stored within
the gall bladder which executes two different
functions – making food alkaline and breaking
down fat.(a) Amount of dissolved oxygen is quite low as
compared to amount of oxygen in air.
Explanation: As the amount of dissolved
oxygen is quite low as compared to amount of
oxygen in air, the rate of breathing in aquatic
organisms is much faster than terrestrial
organisms. Fishes have gills where the dissolved
oxygen is taken up by the blood.
(a) Amount of dissolved oxygen is quite low as
compared to amount of oxygen in air.
Explanation: As the amount of dissolved
oxygen is quite low as compared to amount of
oxygen in air, the rate of breathing in aquatic
organisms is much faster than terrestrial
organisms. Fishes have gills where the dissolved
oxygen is taken up by the blood.
(b) real and inverted
Explanation: When the object is at infinity,
nature of the image will be real and inverted.
mcq questions for class 10
Q. 10) The rate of breathing in aquatic organisms is much faster than terrestrial organisms as:
(a) Amount of dissolved oxygen is quite low as compared to amount of oxygen in air.
(b) Amount of dissolved carbon dioxide is quite low as compared to amount of
carbon dioxide in air.
(c) Fishes have gills
(d) Heart of fishes have only two chambers.
Answer: (a) Amount of dissolved oxygen is quite low as compared to amount of oxygen in air.
Explanation: As the amount of dissolved
oxygen is quite low as compared to amount of
oxygen in air, the rate of breathing in aquatic
organisms is much faster than terrestrial
organisms. Fishes have gills where the dissolved oxygen is taken up by the blood.
Q. 11) Which of the following statements are
incorrect?
(I) Ventricles have thicker muscular walls than atria.
(II) Ventricles pump blood into various
organs
(III) Valves in heart ensure that blood does not flow backwards when atria or
ventricle relax.
(IV) Deoxygenated blood is transferred to lungs by left ventricle.
(a) Both (I) and (II)
(b) Both (II) and (III)
(c) Both (II) and (IV)
(d) Both (III) and (IV)
Answer: (d) Both (III) and (IV)
Explanation: Valves in heart ensure that
blood does not flow backwards when atria
or ventricle contract. Deoxygenated blood is
transferred to lungs for oxygenation by right
ventricle
mcq questions for class 10
Q. 12) What will be the nature of the image for an object placed at infinity?
(a) real and erect
(b) real and inverted
(c) virtual and erect
(d) virtual and inverted
Answer: (b) real and inverted
Explanation: When the object is at infinity,
nature of the image will be real and inverted.
Q. 13) Select the correct statement:
(a) The focal length of a convex lens having power + 2D is + 50 cm.
(b) The focal length of a convex lens having power – 2D is + 50 cm.
(c) The focal length of a concave lens having power + 2D is + 50 cm.
(d) The focal length of a concave lens having power – 2D is + 50 cm.
Answer: (a) The focal length of a convex lens having power + 2D is + 50 cm
Q. 14) The figure given below shows the human excretory system with labels (I) to (IV). Identify the correct label with its function
(a) (I) Kidneys: Elimination of unabsorbed
food and other wastes
(b) (II) Urinary bladder: Stores urine
temporarily
(c) (III)Urethra: Urine is passed out through
it
(d) (IV) Ureter: Transfers liquid waste from
the kidneys into the urinary bladder
Answer: (b) (II) Urinary bladder: Stores urine temporarily
Explanation: The kidneys filter the wastes,
including urea, salt and excess water, which
are flushed out of the body as urine. Part (III)
is ureter which transfers liquid waste from the
kidneys into the urinary bladder. Part (IV) is the urethra which provides a passage of passing out urine from the body.
objective questions of class 10 science chapter 1
Q. 15) Heart of which of the following organisms have four chambers?
(a) Giraffe (b) Fishes
(c) Frog (d) Lizards
Answer: (a) Giraffe
Explanation: Mammals and birds have
four chambers in their heart as they have
high energy needs to maintain their body
temperature. Fishes have two chambers
whereas reptiles and amphibians have three
chambers. As Giraffe is a mammal, it has four
chambered heart.
Q. 16) What is the formula for magnification
obtained with a lens?
(a) Ratio of height of image to height of
object.
(b) Double the focal length.
(c) Inverse of the radius of curvature.
(d) Inverse of the object distance.
Answer: (a) Ratio of height of image to height of object
objective question of biology class 10
Q. 17) An object 4 cm in height, is placed at 15 cm in front of a concave mirror of focal length 10 cm. The distance from the mirror where a screen should be placed to obtain a sharp image of the object is:
(a) 15 cm behind the mirror
(b) 15 cm in front of the mirror
(c) 30 cm behind the mirror
(d) 30 cm in front of the mirror
Answer- . (d) 30 cm in front of the mirror
Q. 18) The metals which react with steam but not with hot water is:
(a) Al, Zn, Fe (b) Pb and Cu
(c) Ag and Au (d) K, Na, Mg
Answer: (a) Al, Zn, Fe
Explanation: Aluminium, zinc and iron do not
react with cold or hot water but they react
with steam to form metal oxide and hydrogen
gas.
objective questions for class 10 science cbse
Q. 19) The changes observed in the colour of iron and copper sulphate solution after the
reaction shown above are:
(a) colour of iron nail fades and copper
sulphate becomes brown
(b) iron becomes brownish and blue colour of copper sulphate fades
(c) iron is unaffected but blue colours of copper sulphate fades
(d) both (a) and (c)
Answer: (b) iron becomes brownish and blue colour of copper sulphets fades.
Explanation: Iron nail becomes brownish
in color due to deposition of copper and
the blue colour of copper sulphate solution
fades as it change to green of ferrous
sulphate.
Q. 20) The chemical reaction in the above reactions is.
(a) FesO4 + Cu → CuSO4 + Fe
(b) Fe + CuSO4 → FeSO4 + Cu
(c) Fe + CuSO4 → Fe + CuO4 + SO2
(d) Fe + CuSO4 → Cu + FeSO2 + O2
Answer: (b) CuSO4 + Fe → FeSO4 + Cu
Explanation: CuSO4 + Fe → FeSO4 + Cu
Copper Iron Ferrous Copper sulphate sulphate
Q. 21) Which of the following is more reactive than Cu?
(a) Iron (b) Silver
(c) Mercury (d) Platinum
Answer:(a) Iron
Explanation: Iron is more reactive than copper as copper is displaced by iron to form ferrous sulphate.
Q. 22) The type of reaction involved in the above activity is:
(a) displacement
(b) double displacement
(c) combustion
(d) combination
Answer: . (a) displacement
Explanation: Iron displace copper from CuSO4
to form FeSO4. As the equation indicates, it is
evident than Fe is more reactive than Cu.
Q. 23) Which of the following statement(s) is (are) true about stomata?
(I) These are the tiny pores present on the surface of the leaves.
(II) Through these, massive amounts of
gaseous exchange take place.
(III) Plants open these pores when carbon dioxide is not required.
(IV)Guard cells operate the opening and closing of these pores.
(a) (I) and (II) only
(b) (I) and (III) only
(c) (I), (II) and (III) only
(d) (I), (II) and (IV) only
Answer; (d) I, II and IV only
Explanation: Since large amounts of water
can also be lost through the stomata, the
plant close these pores when it does not need
carbon dioxide for photosynthesis.
