SAMPLE QUESTION PAPER - 1
Class – X
Session -2021-22 (TERM 1)
Time Allowed: 90 minutes
Subject- Science
Maximum Marks: 40
General Instructions:
1. The question paper contains three parts A, B and C
2. Section A consists of 20 questions of 1 mark each. Any 16 questions are to be attempted
3. Section B consists of 20 questions of 1 mark each. Any 16 questions are to be attempted
4. Section C consists of 10 questions based on two Case Studies. Attempt any 8 questions.
5. There is no negative marking.
SECTION A
Section A consists of 20 questions of 1 mark each. Any 16 questions are to be attempted.
1.
Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ?
[1 Mark]
(a.) Hydrogen
(b.) Oxygen
(c.) Carbon dioxide
(d.) Nitrogen
2. How do we come to know that a chemical reaction has taken place ?
(a.) Change in temperature
(b.) Change in colour
(c.) Evolution of gas
(d.) All of above
[1 Mark]
3. ____________ reactions are some of the most common chemical means to break
down molecules.
[1 Mark]
(a.) Oxidising-reducing
(b.) Acidic
(c.) Nitric
(d.) None of these
4. Fill in the following blanks with suitable words : Parallel rays of light are reflected by a
concave mirror to a point called the _____.
(a.) Principal focus
(b.) Pole
(c.) Centre of curvature
[1 Mark]
(d.) None of these
5. An element A 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:
(a.) Mg
(b.) Na
(c.) P
(d.) Ca
6. What is the range of pH in which our body works ?
(a.) 6.0-6.5
(b.) 7.0-7.8
[1 Mark]
(c.) 7.5-8.5
(d.) 6.5-7.5
7. What is the order of colours from top to bottom in a rainbow ?
(a.) VIBGYOR
[1 Mark]
[1 Mark]
(b.) ROYGBIV
(c.) Can be any of them depending on the situation
(d.) None of the
above
8. Which is the correct definition of respiration from the following?
[1 Mark]
(a.) Biochemical oxidation of nutrients at cellular level
(b.) Biochemical reduction of nutrients at cellular level
(c.) Biochemical oxidation of nutrients at muscular level
(d.) Biochemical reduction of nutrients at muscular level
9. What would be the position of the image formed by a concave mirror when the object
is placed at the centre of curvature ?
[1 Mark]
(a.) At centre of curvature C
(b.) Behind the mirror
(c.) Beyond centre of curvature C
(d.) At the focus F
10. The compounds formed by the transfer of electrons from a metal to a non-metal are
called _____.
[1 Mark]
(a.) Ionic compounds
(b.) Electrovalent compounds
(c.) Both (a.) and (b.)
(d.) Non-Ionic compounds
11. A base can be prepared by the reaction between ______.
(a.) An active non metal and water
(b.) A gas and water
(c.) A sulphide and water
(d.) An active metal and water
[1 Mark]
12. On what factor does the colour of scattered light depend upon ?
(a.) Colour of the particles
(b.) Size of the particles
(c.) Both of these
(d.) None of these
13. Which of these is a function of an artificial kidney ?
(a.) Helps to remove harmful wastes
[1 Mark]
[1 Mark]
(b.) Helps to remove extra salts and
water
(c.) Control blood pressure
(d.) All of these
14. A lens bounded by two spherical surfaces, bulging outwards. Such a lens is called
______.
[1 Mark]
(a.) Convex lens
(b.) Concave lens
(c.) All of the above
(d.) None of the above
15. Name the indicator which can give us an idea of how strong or weak an acid or base is.
[1 Mark]
(a.) Pablo indicator
(b.) Universal indicator
(c.) Sorenson Indicator
(d.) None of these
16. Assertion: A ray of light travelling from a rarer medium to a denser medium slows down
and bends away from the normal. When it travels from a denser medium to a rarer
medium, it speeds up and bends towards the normal.
Reason: The speed of light is higher in a rarer medium than a denser medium.
Choose the correct option:
[1 Mark]
(a.) Both A and R are true and R is the correct explanation of A.
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
17. Assertion : In the human heart, there is no mixing of oxygenated and deoxygenated blood.
Reason : Valves are present in the heart which allows the movement of blood in one direction.
Choose the correct option:
[1 Mark]
(a.) Both A and R are true and R is the correct explanation of A.
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
18. The entire surface of _______ organism is in contact with the environment. [1 Mark]
(a.) Multi-cellular
(b.) Single-cellular
(c.) Ultra-cellular
(d.) Many one-cellular
19. Which of the following is not a physical change ?
(a.) Boiling of water to give water vapour
(c.) Dissolution of salt in water
[1 Mark]
(b.) Melting of ice to give water
(d.) Combustion of Liquefied Petroleum Gas
(LPG)
20. What kind of process is respiration ?
(a.) Anabolic
(b.) Catabolic
[1 Mark]
(c.) Both (a.) and (b.)
(d.) None of these
SECTION B
Section B consists of 20 questions of 1 mark each. Any 16 questions are to be attempted.
1. Someone put some universal indicator paper onto wet soap. The pH is 8. What does
this tell you about the soap ?
(a.) Basic
(b.) Acidic
[1 Mark]
(c.) Neutral
(d.) None of these
2. _________ use simple food materials like carbon dioxide and water to gain energy.
[1 Mark]
(a.) Heterotrophs
(b.) Necrotrophs
3. Magnification of plane mirror is always -
(c.) Autotrophs
(d.) Exatrophs
[1 Mark]
(a.) +1
(b.) 0
(c.) -1
(d.) None
4. Assertion : The twinkling of stars is due to the fact that the refractive index of earth's
atmosphere fluctuates.
Reason : In cold countries the phenomenon of looming ( ship appears in the sky)
takes place because the refractive index of air decreases with height.
Choose the correct option.
[1 Mark]
(a.) Both A and R are true and R is the correct explanation of A.
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
5. Which of the following gives the correct increasing order of acidic strength ? [1 Mark]
(a.) Water < acetic acid < hydrochloric acid (b.) Water < hydrochloric acid < acetic acid
(c.) Acetic acid < water < hydrochloric acid (d.) Hydrochloric acid < water < acetic acid
6. Which sign is used between the reactants, written on the left-hand side (LHS) of the
chemical reaction ?
(a.) +
(b.) -
[1 Mark]
(c.) ±
(d.) ∓
7. ______ is a long tube which collects urine from the kidney.
(a.) Kidney
(b.) Ureter
(c.) Urinary bladder
[1 Mark]
(d.) None of these
8. Assertion : Copper sulphate crystals are wet because they contain water of
crystallisation.
Reason : Water of crystallisation is the fixed number of molecules of water present in
one formula unit of salt.
Choose the correct option.
(a.) Both A and R are true and R is the correct explanation of A.
[1 Mark]
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
9. What is the reactivity series ?
[1 Mark]
(a.) The reactivity series is a series of metals, in order of reactivity from highest to
lowest.
(b.) The reactivity series is a series of non metals, in order of reactivity from highest to
lowest.
(c.) The reactivity series is a series of non-metals reactions with metals, in order of
reactivity from highest to lowest.
(d.) The reactivity series is a series of metals, in order of reactivity from lowest to
highest.
10. The autotrophic mode of nutrition requires ____.
[1 Mark]
(a.) Carbon dioxide and water (b.) Sunlight (c.) Chlorophyll
(d.) All of the above
11. What is the relationship between distance of object (u), distance of image (v) and
focal length (f) in a spherical lens ?
(a.) u + v = f
(b.)
1
𝑣
1
𝑢
- =
1
𝑓
[1 Mark]
(c.)
1
𝑣
1
𝑢
+ =
1
𝑓
(d.)
1
𝑢
1
𝑣
- =
12. Aqueous solutions of glucose and alcohol do not give H+ ions.
(a.) TRUE
1
𝑓
[1 Mark]
(b.) FALSE
13. Assertion: Plaster of Paris is stored in a moisture proof container.
Reason: Plaster of Paris sets into a hard mass on wetting with water to form
anhydrous calcium sulphate.
Choose the correct option.
(a.) Both A and R are true and R is the correct explanation of A.
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
[1 Mark]
14. A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards
the centre of the sphere, is called a___.
[1 Mark]
(a.) Concave mirror
(b.) Convex mirror
(c.) Plane mirror
(d.) None of the above
15. There is a lateral displacement when light passes through a parallel refracting
surface. State whether the statement is true or false.
(a.) TRUE
[1 Mark]
(b.) FALSE
16. “A lens can form a magnified erect image as well as a magnified inverted image of an
object placed in front of it.” State the nature of this lens.
(a.) Convex
[1 Mark]
(b.) Concave (c.) Both convex and concave (d.) None of these
17. Assertion : Human heart is four chambered.
Reason : Vena cava is the only artery that supplies deoxygenated blood to the heart.
Choose the correct option.
[1 Mark]
(a.) Both A and R are true and R is the correct explanation of A.
(b.) Both A and R are true but R is not the correct explanation of A.
(c.) A is true but R is false.
(d.) A is false but R is true.
18. What is the relationship between distance of object (u), distance of image (v) and
focal length (f) for a spherical mirror ?
(a.) u + v = f
(b.)
1
𝑣
1
𝑢
- =
1
𝑓
[1 Mark]
(c.)
1
𝑣
1
𝑢
+ =
1
𝑓
(d.)
1
𝑢
1
𝑣
- =
1
𝑓
19. You are given water, mustard oil, glycerine and kerosene. In which of these media a ray
of light incident obliquely at the same angle would bend the most?
(a.) Kerosene
(b.) Water
(c.) Mustard oil
[1 Mark]
(d.) Glycerine
20. What is pH of the stomach due to secretion of HCl.
(a.) 1 - 1.5
(b.) 1.5 - 3.0
(c.) 3.0 - 4.0
[1 Mark]
(d.) 4.0 - 5.5
SECTION C
Case Study Based Questions
Section C consists of 10 questions of 1 mark each. Any 8 questions are to be attempted.
Case Study 1 According to the "Law of Conservation of Mass", mass can neither be created nor destroyed in a
chemical reaction. That is, the total mass of the elements present in the products of a chemical
reaction has to be equal to the total mass of the elements present in the reactants. In other words,
the number of atoms of each element remains the same, before and after a chemical reaction. Hence,
we need to balance a skeletal chemical equation.
1. Mg + O2 ----> MgO Is the given chemical equation balanced ?
(a)YES
[1 mark]
(b)NO
2. Which of the following steps are involved in writing a balanced chemical equation?
[1 mark]
(a)Word equation is written in formula form.
(b)Boxes are drawn around each formula and nothing is changed inside these boxes.
(c)Number of atoms of different elements present in unbalanced equations are listed.
(d)All of the above
3. Which of the following represents a balanced chemical equation?
a.
2Mg +O2 ----> 2MgO
b.
Mg + O2 ----> 2MgO
c.
Mg + O2 ----> MgO
[1 mark]
d. 2Mg + O2 ----> MgO
4. Why should we balance a chemical equation ?
[1 mark]
a. To follow law of conservation of mass
b. To make the number of the atoms of the reactants equal to the number of the
atoms of the products.
c. To make the total mass of the reactants equal to the mass of the products.
d. All of the above
5. State true or false: Word equation is a balanced chemical equation.
a. TRUE
[1 mark]
b. FALSE
Case Study 2Ram was suffering from stomach pain for a number of days. He consulted a doctor who
advised him to take two antacid tablets after each meal for about a week and avoid spicy
food. Ram followed the advice strictly and was cured.
1. What was the problem faced by Ram ?
a. Anaemia
b. Acidity
[1 mark]
c. Anxiety
2. True or false. The antacid tablets contain bases like NaHCO3 or Mg(OH)2 which
neutralise the effect of HCl released in the stomach.
a. TRUE
[1 mark]
b. FALSE
3. NaHCO3 + HCl ---> NaCl + H2O + CO2. Is this the correct chemical reaction happening
inside the stomach when Ram takes antacid?
[1 mark]
a. YES
b. NO
c. MAYBE
4. Antacids reduce the excess _____ in the stomach.
a. Water
b. Base
c. Acidd. None of these
5. Are antacids used to cure acidity in the stomach?
a. YES
[1 mark]
b. NO
x-x-x- End of Question Paper -x-x-x
[1 mark]
SAMPLE QUESTION PAPER - 1
Class – X
Session -2021-22 (TERM 1)
Subject- SCIENCE
Time Allowed: 90 minutes
ANSWER SCRIPT
Section A
Maximum Marks: 40
Section B
Section C
Q.No.
ABCD
Q.No.
ABCD
Q.No.
ABCD
1
OOOO
21
OOOO
41
OOOO
2
OOOO
22
OOOO
42
OOOO
3
OOOO
23
OOOO
43
OOOO
4
OOOO
24
OOOO
44
OOOO
5
OOOO
25
OOOO
45
OOOO
6
OOOO
26
OOOO
46
OOOO
7
OOOO
27
OOOO
47
OOOO
8
OOOO
28
OOOO
48
OOOO
9
OOOO
29
OOOO
49
OOOO
10
OOOO
30
OOOO
50
OOOO
11
OOOO
31
OOOO
12
OOOO
32
OOOO
13
OOOO
33
OOOO
14
OOOO
34
OOOO
15
OOOO
35
OOOO
16
OOOO
36
OOOO
17
OOOO
37
OOOO
18
OOOO
38
OOOO
19
OOOO
39
OOOO
20
OOOO
40
OOOO
Examiner's Signature
Invigilator's Signature
SAMPLE QUESTION PAPER - 1
Class – X
Session -2021-22 (TERM 1)
Time Allowed: 90 minutes
Subject-SCIENCE
Maximum Marks: 40
ANSWER KEY
Section A
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
C
D
A
A
B
B
A
A
A
C
D
B
D
A
B
D
B
B
D
B
Section B
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
A
C
A
B
A
A
B
D
A
D
B
A
C
A
A
A
C
C
D
B
Section C
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
B
D
A
D
B
B
A
A
C
A