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MCQ question for class 10
Q. 1. Which two metals do not corrode easily?
(a) Gold and Platinum
(b) Gold and Iron
(c) Zinc and Iron
(d) Aluminium and Zinc
Answer) a) Gold and Platinum
Explanation: Gold and Platinum are the most
stable metals which do not react easily.
Q.2 )A blue coloured salt turns white when
heated but regains its blue colour when
moistened with water as shown in figure
below:
The salt is:
(a) FeSO4.7H2O
(b) CuSO4.5H2O
(c) Na2CO3.10H2O
(d) CaSO4.2H2O
Answer) (b) CuSO4. 5H2O
Explanation: The blue coloured salt is hydrated copper sulphate, CuSO4. 5H2O, which turns white on being heated as it loses its molecules of water of crystallization.
Q. 3 . Why is sodium metal never left open in air?
(a) It melts at room temperature.
(b) It reacts with moisture present in air violently.
(c) It reacts with oxygen present in air
violently.
(d) Both (b) and (c).
Answer) (c) It reacts with oxygen present in air violently
Explanation: Because sodium and potassium
is very reactive metal and even combines
explosively with air at room temperature and
catches fire.
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Q.4 . Which of the following option is/are the correct representation of the formula for the compound CaCl2?
Answer: (a)
Q. 5) Name the substance obtained by the action of chlorine on dry slaked lime.
(a) Washing soda (b) Hypochloride
(c) Baking soda (d) Bleaching powder
Answer: (d) Bleaching powder
Explanation:
Ca(OH)2 + Cl2 → CaOCl2 + H2O
Slaked Chlorine Bleaching Water
Line powder
Q. 6) A salt is obtained using common salt as
a raw material. It is used in glass, soap
and paper industries and also used in the
manufacture of sodium compounds such as
borax.
Identify the salt.
(a) Caustic soda
(b) Bleaching powder
(c) Baking soda
(d) Washing soda
Answer : (d) Washing soda
Explanation: Washing soda or Na2CO3.10H2O
is obtained using common salt as a raw
material. It is obtained by heating baking soda
and recrystallisation of sodium carbonate
gives washing soda. It is also a basic salt.
Na2CO3 + 10H2O → Na2CO3.10H2O
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Q. 7) The exchange of material between the blood and surrounding cells takes place through:
(a) Arteries
(b) veins
(c) Capillaries
(d) Nephrons
Answer : (c) Capillaries
Explanation: Capillaries are the smallest blood vessels that have walls which are one-cell
thick. Exchange of material between the blood and surrounding cells takes place across this
thin wall. Arteries are the vessels which carry blood away from the heart to various organs
of the body.Veins collect the blood from different organs and bring it back to the heart.
Q.8 ) An object is placed 40 cm from the concave mirror with a focal length of 20 cm. The image formed is:
(a) behind the mirror
(b) between the mirror and focus
(c) at focus
(d) centre of curvature of mirror
Answer : (d) centre of curvature of mirror
Q. 9) Four statements on blood are given below. Select the incorrect statements:
(I) Blood is a fluid connective tissue.
(II) Blood consists of a solid medium called plasma in which the cells are suspended.
(III) Plasma transports food, carbon dioxide and nitrogenous wastes in gaseous form.
(IV)Many other substances like salts, are transported by the blood.
(a) Both (I) and (II)
(b) Both (II) and (III)
(c) Both (III) and (IV)
(d) Both (I) and (IV)
Answer 🙂 (b) Both (II) and (III)
Explanation: Blood consists of a liquid medium called plasma in which the cells are suspended. Plasma transports food, carbon dioxide and nitrogenous wastes in dissolved form.
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Q.10 .) The products of anaerobic respiration in yeast are:
(I) Ethanol
(II) Lactic acid
(III) Carbon dioxide
(IV) Water
(a) Both (I) and (II)
(b) Both (II) and (III)
(c) Both (II) and (IV)
(d) Both (I) and (III)
Answer : (d) Both (I) and (III)
Explanation: Anaerobic respiration takes place
in yeast during fermentation and the products
are ethanol, carbon dioxide and energy.
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Q.11 .) Which is the basic filtration unit present in the kidneys.
(a) Neuron (b) Bowman’s capsule
(c) Nephrons (d) DCT
Answer : (c) Nephrons
Explanation: A nephron is the basic structural
and functional unit of the kidneys that
regulates water and soluble substances in the
blood by filtering the blood, reabsorbing what
is needed, and excreting the rest as urine.
Q. 12) The nature of image formed by a spherical mirror for an object OA placed as shown in the figure will be:
(a) Real, inverted and enlarged
(b) Virtual, erect and enlarged
(c) Real, inverted and diminished
(d) Virtual, erect and diminished
Answer : (b) Virtual, erect and enlarged
Explanation: Here, the focal length =
R 2 = 15 cm and the object is placed at 10 cm or
between the pole and focus of the concave
mirror. Therefore, image will be virtual, erect
and enlarged or magnified.
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Q. 13 ) An object is placed at a large distance
in front of a convex mirror of radius of
curvature 40 cm. What is the distance of
image from the mirror?
(a) 40 cm (b) 20 cm
(c) 60 cm (d) 80 cm
Answer : (d) 80 cm
Explanation: The rays coming from an object
placed at large distance can be considered as
a parallel rays. After reflection from it, they
appear to meet at its focus which is 40
2
= 20
cm.
Q. 14 ) Which metals do not react with water at all?
(a) Pb (b) Zn
(c) Cu (d) Both (a) and (c)
Answer : (d) Both (a) and (c)
Explanation : Metals such as lead (Pb), Copper
(Cu), Silver (Ag) and Gold (Au) do not react with
water at all as they lies below hydrogen in
activity series.
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Q. 15 ) The gas mentioned in above passage is:
(a) O2 (b) H2S
(c) CO2 (d) H2
Answer : (c) CO2
Explanation: CO2 turns lime water milky.
Q. 16 ) Ca(HCO3) is:
(a) soluble in water
(b) partly soluble in water
(c) insoluble in water
(d) partly insoluble in water
Answer : (a) soluble in water
Explanation: Calcium bicarbonate is soluble in
water while calcium carbonate is insoluble in
water.
Q. 17) Lime water and chlorine reacts to form:
(a) CaCl2 (b) CaOCl2
(c) Ca(ClO3)2 (d) CaO2Cl2
Answer : (b) CaOCl2
Explanation: Lime water reacts with chlorine to form CaOCl2(bleaching powder).
Ca(OH)2 + Cl2 → CaOCl2 + H2O
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Q. 18) Lime water turns milky in the reaction due to the:
(a) Formation of calcium carbonate
(b) CO2 gas evolved
(c) Formation of calcium bicarbonate
(d) Oxygen gas is evolved
Answer : (a) Formation of calcium carbonate
Explanation: Ca(OH)2 + CO2(g) →
Calcium hydroxide Carbon dioxide (Lime water) CaCO3(s) + H2O(l)
Calciumcarbonate Water (white ppt.) (Makes limewater milky)
Q. 19) The excretory system of human beings
include:
(a) a pair of kidney, a pair of urinary
bladders, a ureter, and a urethra.
(b) a kidney, a ureter, a urinary bladder and a urethra.
(c) a pair of kidney, a pair of ureters, a pair of urinary bladders and a urethra.
(d) a pair of kidney, a pair of ureters, a
urinary bladder and a urethra.
Answer : (d) a pair of kidney, a pair of ureters, a urinary bladder and a urethra
Explanation: The excretory system of human
beings includes a pair of kidneys, a pair of
ureters, a urinary bladder and a urethra
Q. 20) The given figure represent the structure of a nephron.
Which of the following is responsible for
concentrating the solute in the filtrate?
(a) Q (b) S
(c) R (d) P
Answer: (c) R
Explanation: In the given diagram, P is renal
artery; Q is proximal convoluted tubule; R is
loop of Henle and S is collecting tuble
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Q. 21) Which of the following statement(s) is (are) true about excretion in human beings?
(I) Urine is stored in the urethra until the urge of passing it out.
(II) Kidneys are the primary excretory
organs.
(III) The bladder is muscular, so it is under nervous control.
(IV)Each kidney has large numbers of
filtration units called nephrons.
(a) (I) and (II) only (b) (I) and (III) only
(c) (II), (III) and (IV) (d) (II) and (IV) only
Answer: (c) (II), (III) and (IV)
Explanation: Urine is stored in the urinary
bladder until the pressure of the expanded
bladder leads to the urge to pass it out through
the urethra.
Q. 22) Study the table below and select the
incorrect match.
Answer: (b) Lungs; Substances Excreted: Urea
Explanation: Lungs excrete carbon dioxide
from the blood.
Q. 23) What will be the nature of the image formed by convex lens:
(a) real and inverted, diminished
(b) virtual and erect of same size as that of
object
(c) real and inverted, magnified
(d) virtual and erect magnified
Answer : (b) virtual and erect magnified
Explanation: The nature of the image formed
by convex lens, in the case is virtual and erect.
The size of image is larger then that of the
object i.e., magnified image will be formed.
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Q. 24) If the focal length of the lens is 4 cm and object is placed at 6 cm from optical centre the image will be formed at:
(a) 2.4 cm from O (b) 4.8 cm from O
(c) 24 cm from O (d) 48 cm from O
Answer: (a) 2.4 cm from O
Q. 25) Which diagram represent the correct ray diagram:
(a) (I) (b) (II)
(c) (III) (d) (IV)
Answer: (a) (I)
Explanation: The convex lens has the property
beam of light rays as a point i.e. focus the lens.
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