Class 10 Science MCQ Sample Paper 1 First Term Exam

Sample Paper 1 for Class 10 Science with answers based on the latest CBSE Sample Papers issued for first term examination November-December 2021. The complete paper is divided in three sections named Section A, B and C.

Section A and B contains 24 questions each, out of which 20 are to be attempted and the Section C contains 12 question to attempt any 10 only. Students can see these in general instructions given below.

Class 10 Science Sample Paper 1 with Answers

Time: 90 Minutes
Max. Marks: 50
General Instructions:

    1. The Question Paper contains three sections.
    2. Section A has 24 questions, Attempt any 20 questions.
    3. Section B has 24 questions, Attempt any 20 questions.
    4. Section C has 12 questions, Attempt any 10 questions.
    5. All questions carry equal marks.
    6. There is no negative marking.

Section A

Q1

During the preparation of hydrogen chloride gas, the gas is usually passed through

[A]. Calcium hydroxide
[B]. Calcium carbonate
[C]. Calcium sulphate
[D]. Calcium chloride
Q2

Calcium phosphate is present in tooth enamel. Its nature is

[A]. Acidic
[B]. Basic
[C]. Neutral
[D]. Amphoteric
Q3

What is the pH value of saliva after meal?

[A]. Between 0 and 4
[B]. Between 4 and 5
[C]. Between 5 and 6
[D]. Between 6 and 7
Q4

Name the chemicals used in acid fire extinguisher?

[A]. Sodium bi-carbonate, nitrogen and HCl
[B]. Sulphuric acid and Carbon dioxide
[C]. Nitrogen and Sodium Chloride
[D]. Sodium hydrogen carbonate and sulfuric acid




Q5

Which of the following statement is correct for the water with detergent dissolved in it?

[A]. Low concentration of hydroxide ion (OH-) and high concentration of hydronium ion (H₃O+)
[B]. High concentration of hydroxide ion (OH-) and low concentration of hydronium ion (H₃O+)
[C]. High concentration of hydroxide ion (OH-) as well as hydronium ion (H₃O+)
[D]. Equal concentration of both hydroxide ion (OH-) and hydronium ion (H₃O+)
Q6

Which of the following gases can be used for the storage of fresh sample of an oil (which we use for eating or frying purpose) for a long time?

[A]. Carbon dioxide or oxygen
[B]. Nitrogen or oxygen
[C]. Carbon dioxide or Helium
[D]. Helium or nitrogen
Q7

In which of the following chemical equations, the abbreviation represent the correct states of the reactants and products involved at reaction temperature?

[A]. AlCl₃ (aq) + 3NH₄OH (aq) –> Al(OH)₃ (s)
[B]. AlCl₃ (aq) + 3NH₄OH (l) –> Al(OH)₃ (aq)
[C]. AlCl₃ (l) + 3NH₄OH (aq) –> Al(OH)₃ (s) + 3NH₄Cl (aq)
[D]. AlCl₃ (aq) + 3NH₄OH (aq) –> Al(OH)₃ (aq) + 3NH₄Cl (s)
Q8

The reaction 2HNO₃ + Ca(OH)₂ –> Ca(NO₃)₂ + 2H₂O is an example of

[A]. Displacement reaction and double displacement reaction
[B]. Double displacement reaction and neutralization reaction
[C]. Neutralization reaction and combination reaction
[D]. Displacement reaction and combination reaction
Q9

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observation are recorded. Point out the correct observation:

[A]. The surface of metal becomes Shiny
[B]. The reaction mixture turns milky
[C]. Odour of a pungent smelling gas is recorded
[D]. A colourless and odourless gas is evolved
Q10

On heating a blue coloured powder of copper (II) nitrate in a boiling tube, a black substance X, Oxygen gas and a brown gas Y was formed. Identify the products correctly:

[A]. Black Substance X: Copper Brown Gas Y: Nitrogen dioxide
[B]. Black Substance X: Copper Oxide Brown Gas Y: Nitrogen oxide
[C]. Black Substance X: Copper Oxide Brown Gas Y: Nitrogen dioxide
[D]. Black Substance X: Copper Brown Gas Y: Nitrogen oxide
Q11

Which is the first enzyme to mix with food in the digestive tract?

[A]. Pepsin
[B]. Cellulase
[C]. Amylase
[D]. Trypsin
Q12

What happens during digestion of carbohydrates?

[A]. Specific hormones break down carbohydrates into simple sugar such as glucose.
[B]. Specific enzymes break down carbohydrates into fatty acids and glycerol.
[C]. Specific enzymes break down carbohydrates into simple sugar such as glucose.
[D]. Specific hormones break down carbohydrates into fatty acids and glycerol.




Rahul took some freshly prepared lime water in two test tubes marked A and B. He blew air through the lime water in test tube A. He then uses a syringe and passed air through the fresh lime water in test tube B.
[I] The amount of carbon dioxide in atmospheric air and excelled air are equal.
[II] Exhaled air contains more carbon dioxide as compared to atmospheric air
[III] Atmospheric air contains more carbon dioxide gas as compared to exhaled air.
[IV] Lime water turned milky immediately in both the test tubes A and B.

Q13

Select the incorrect set of observation from the statements given below

[A]. Both (I) and (IV)
[B]. Both (II) and (IV)
[C]. Both (I), (II) and (III)
[D]. Both (I), (III) and (IV)
Q14

The air passage does not collapse while going into the lungs

[A]. Rings of cartilage which ensures that the air passage does not collapse while going into the lungs.
[B]. Diaphragm which contracts and flattens upon inhalation
[C]. Alveoli where the exchange of gases can take place
[D]. Fine hairs for air filtration
Q15

The excretory system of human beings includes

[A]. A kidney, a ureter, a urinary bladder and a urethra
[B]. A pair kidneys, a ureter, a pair of urinary bladders, and a urethra
[C]. A pair of kidneys, a pair of ureters, a urinary bladder and a urethra
[D]. A pair of kidneys, a pair of ureters, a pair urinary bladders and a urethra.
Q16

The digested food stores in plants in the form of

[A]. Proteins
[B]. Starch
[C]. Carbohydrate
[D]. Fats
Q17

A parallel beam of light, parallel to principle axis of a concave mirror, after reflection passes through

[A]. Center of Curvature
[B]. Focus
[C]. Parallel to principle focus
[D]. Bounce back



Q18

The angle between the incident and reflected rays is 90°. If the plane mirror is rotated by 10° about point-O in the anti-clockwise direction, then the angel between incident and reflected rays will be

[A]. 55°
[B]. 90°
[C]. 100°
[D]. 110°
Q19

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.
Q20

The apparent depth of the fish in water is

[A]. Less than the actual depth because light travels from a rarer medium to denser medium
[B]. Less than the actual death because light travels from a denser medium to rarer medium
[C]. More than the actual depth because of total internal reflection of light
[D]. More than the actual depth because light travels from a denser medium to rarer medium
Q21

A student determines the focal length of a device “X” by focusing the image of a distant object on a screen placed 20 cm from the device on the same side as the object. The device X is

[A]. Concave lens of focal length 10 cm
[B]. Convex lens of focal length 20 cm
[C]. Concave mirror of focal length 10 cm
[D]. Concave mirror of focal length 20 cm
Q22

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.



Section B

Q23

Aqua regia is a yellow orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals. The composition of aqua-regia is

[A]. Dil. HCl (3): Conc. HNO₃ (1)
[B]. Conc. HCl (3): Dil. HNO₃ (1)
[C]. Conc. HCl (3): Conc. HNO₃ (1)
[D]. Dil. HCl (3): Dil. HNO₃ (1)
Q24

The student performing this activity noted the following observation on the colour of flame observed when the metal is burnt. Select the Metal and Colour of flame

[A]. Aluminium – Blue
[B]. Copper – Yellow
[C]. Sodium – White
[D]. Magnesium – White
Q25

The correct chemical equation describing the thermite process is

[A]. Fe₂O₃ (s) + 2Al(s) + Heat –> 2Fe(s) + Al₂O₃ (l)
[B]. Fe₂O₃ (s) + 2Al(s) –> 2Fe(l) + Al₂O₃ (s) + Heat
[C]. 3Fe₂O(s) + 2Al(s) + Heat –> 3Fe(l) + Al₂O₃ (s)
[D]. 3Fe₂O(s) + 2Al(s) –> 3Fe(l) + Al₂O₃ (s) + Heat
Q26

The correct arrangement of metals Mg, Zn, Fe and AL in decreasing order of their reactivity with dilute acids is

[A]. AL > Mg > Zn > Fe
[B]. AL > Mg > Fe > Zn
[C]. Mg > AL > Zn > Fe
[D]. Mg > AL > Fe > Zn
Q27

What happens when zinc metal is added to a test tube containing Al₂(SO₄)₃ solution?

[A]. Zinc displaces aluminium from its salt solution
[B]. No reaction takes place
[C]. The solution becomes blue colour
[D]. The solution becomes blue colourless and aluminium metal is deposited

Question No. 31 to 35 consists of two segments – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:



Q28

Assertion [A]: Baking soda creates acidity in the stomach. Reason [R]: Baking soda is alkaline.

[A]. Both A and R are True and R is the correct explanation of A.
[B]. Both A and R are True and R is NOT the correct explanation of A.
[C]. A is True but R is false
[D]. A is False but R is true
Q29

Assertion [A]: After white washing the walls, a shiny white finish on walls is obtained after two to three days. Reason [R]: Calcium oxide reacts with carbon dioxide to form calcium hydrogen carbonate which gives shiny white finish.

[A]. Both A and R are True and R is the correct explanation of A.
[B]. Both A and R are True and R is NOT the correct explanation of A.
[C]. A is True but R is false
[D]. A is False but R is true
Q30

Assertion [A]: A mineral is called ore, when metal is extracted from it conveniently and economically. Reason [R]: All are minerals but all minerals are not ores.

[A]. Both A and R are True and R is the correct explanation of A.
[B]. Both A and R are True and R is NOT the correct explanation of A.
[C]. A is True but R is false
[D]. A is False but R is true
Q31

Assertion [A]: In human heart, there is no mixing of oxygenated and deoxygenated blood. Reason [R]: Valves are present in the heart which allows the movement of blood in One Direction only.

[A]. Both A and R are True and R is the correct explanation of A.
[B]. Both A and R are True and R is NOT the correct explanation of A.
[C]. A is True but R is false
[D]. A is False but R is true
Q32

Assertion [A]: If the rays are diverging after emerging from a lens, the lens must be concave. Reason [R]: The convex lens can give diverging rays.

[A]. Both A and R are True and R is the correct explanation of A.
[B]. Both A and R are True and R is NOT the correct explanation of A.
[C]. A is True but R is false
[D]. A is False but R is true
Q33

Name the material “X” filled in the small test tube and the material “Y” placed at the bottom of the conical flask.

[A]. Sodium hydroxide and Iron nails
[B]. Hydrogen and sodium
[C]. Potassium permanganate and dry seeds
[D]. KOH and Wet germinating seeds
Q34

Find out the incorrect differences between aerobic respiration and anaerobic respiration.

[A]. Aerobic: Aerobic respiration takes place in the presence of oxygen; Anaerobic: Anaerobic respiration take place in the absence of oxygen.
[B]. Aerobic: In aerobic respiration complete breakdown of food takes place; Anaerobic: In an aerobic respiration partial breakdown of food occurs.
[C]. Aerobic: Large amount of energy is released; Anaerobic: Small amount of energy is released.
[D]. Aerobic: End products of aerobic respiration are lactic acid and carbon dioxide; Anaerobic: End products of anaerobic respiration are carbon dioxide and water.
Q35

In Cloudy days situation, what happens to the “photosynthesis”?

[A]. No photosynthesis occurs
[B]. Slow rate of photosynthesis
[C]. Raw materials taken from soil
[D]. CO₂ and Heat taken through stomata
Q36

Which statement is valid conclusion based on the information

[A]. The maximum rate of human digestion of cause at about 45° Celsius
[B]. The maximum rate of human respiration occurs at about 57° Celsius
[C]. Temperature can influence the action of an enzyme
[D]. Growth can be controlled by enzyme




Q37

The force that blood exerts against the wall of a vessel is

[A]. More in arteries and less in vein
[B]. More in veins and less in arteries
[C]. More in blood capillaries
[D]. More in heart
Q38

Water will be absorbed by the root hairs when the external medium is

[A]. Isotonic
[B]. Hypertonic
[C]. Hypotonic
[D]. Viscous
Q39

Root pressure is maximum when

[A]. Transpiration is very high and absorption is very low
[B]. Transpiration is very low and absorption are very high
[C]. Both transpiration and absorption are very high
[D]. Both the absorption and transpiration are very low
Q40

Your school laboratory has one large window. To find the focal length of a concave mirror using one of the walls as screen, the experiment may be performed

[A]. on the same wall as the window
[B]. on the wall adjacent to the window
[C]. on the wall opposite to the window
[D]. only on the table as per laboratory arrangement
Q41

In order to determine the focal length of a concave mirror by obtaining the image of a distant object on screen, the position of the screen should be

[A]. Parallel to the plane of concave mirror
[B]. Perpendicular to the plane of concave mirror
[C]. Inclined at an angle 60° to the plane of mirror
[D]. In any direction with respect to the plane of concave mirror
Q42

A student has focussed on the screen a distant building using a convex lens. If he has selected a blue coloured building as object, select from the following options the one which gives the correct characteristics of the image formed on the screen.

[A]. Virtual, erect, diminished and green shade
[B]. Real, inverted, diminished and in violet shade
[C]. Real, inverted, diminished and in blue shade
[D]. Virtual, inverted, diminished and in blue shade
Q43

You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at some angle would bend the most? (Refractive index of water=1.33, Mustard oil=1.46, Glycerine=1.473, Kerosene= 1.44)

[A]. Kerosene
[B]. Water
[C]. Mustard oil
[D]. Glycerine
Q44

A Student carries out the experiment of tracing the path of a ray of light through a rectangular glass slab for two different values of angle of incidence ∠i = 30° and ∠i = 45°. In the two cases the student is likely to observe the set of values of angle of refraction and angle of emergence as

[A]. ∠r = 30°, ∠e = 20° and ∠r = 45°, ∠e = 28°
[B]. ∠r = 30°, ∠e = 30° and ∠r = 45°, ∠e = 45°
[C]. ∠r = 20°, ∠e = 30° and ∠r = 28°, ∠e = 45°
[D]. ∠r = 20°, ∠e = 20° and ∠r = 28°, ∠e = 28°
Q45

What happens when calcium is treated with water? (i) it does not react with water (ii) it reacts violently with water (iii) it reacts less violently with water (iv) bubbles of hydrogen gas formed stick to the surface of calcium

[A]. (i) and (iv)
[B]. (ii) and (iii)
[C]. (i) and (ii)
[D]. (iii) and (iv)




Section C

Section – C consists of three Cases followed by questions. There are a total of 12 questions in this section. Attempt any 10 questions from this section.
The first attempted 20 questions would be evaluated.
Case – 1
The reaction between MnO₂ with HCl is depicted. It was observed that a gas with bleaching abilities was released.

Q46

The chemical reaction between MnO₂ and HCl is an example of

[A]. Displacement reaction
[B]. Combination reaction
[C]. Redox reaction
[D]. Decomposition reaction
Q47

Chlorine gas reacts with __________ form bleaching powder

[A]. Dry Ca(OH)₂
[B]. Dilute solution of Ca(OH)₂
[C]. Concentrated solution of Ca(OH)₂
[D]. Dry CaO
Q48

Identify the correct statement from the following

[A]. MnO₂ is getting reduced whereas HCl is getting oxidized
[B]. MnO₂ is getting oxidized whereas HCl is getting reduced
[C]. MnO₂ and HCl both are getting reduced
[D]. MnO₂ and HCl both are getting oxidized
Q49

In the above discussed reaction, what is the nature of MnO₂?

[A]. Acidic oxide
[B]. Basic oxide
[C]. Neutral oxide
[D]. Amphoteric oxide