Class 10 Sample Paper 2022 Solution Science Term 1

Marking scheme of Practice Paper-I ,2021-22
Class X
Science (086)

ANSWERS
Q.N. SECTION - A

A. 2
1.
B. Pop sound and Hydrogen

2.
B. Pop sound and Hydrogen

3.
C. Fe3O4.

4.
C. CaO (s) + CO2 (g) → CaCO3
C. C

5.
C. weak acid and strong base.

6.
A. MnO2

7.
C- Combination and oxidation of phosphorus takes place
8. C. Hydronium

9.
B. I and III.

B. 3 Fe + 4H2O Fe3O4 + 4 H2
10.

B. II and IV

11.

B. chloroplast

B. nephron
12. Alternative question for visually impaired students
B. nephron
B. New chemicals are formed during a neutralization reaction.
13.

D. nucleus , chloroplast ,vacuole , guard cell

14.
D- nucleus , chloroplast and vacuole

15.
B. Anaerobic respiration

16.
C. It ensure blood flow in one direction.

C- Concave mirror
17.

C. 30 cm
18.
Convex lens focus a real, point sized image at focus, the object is placed
C.At infinity

C- Diopter
19.

20. D. Velocity of light in vaccum to the velocity of light in the medium.

21. C. ∠i > ∠r

Image formed by plane mirror is
22. C. Virtual and erect

23. C- beyond 20 cm.

B.Convex mirror
24.

SECTION - B

A. 6,6

25.
B. (i) and (iii)
26.
27. B.Graphite

A. Calcium
28.
D- 1 -a , 2-c and 3-b
29.
B. It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
30.
Question No. 31 to 35 consist of two statements – Assertion (A) and Reason (R). Answer these
questions selecting the appropriate option given below:
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
31. C. Both A and R are true and R is not the correct explanation of A .

32. D. A is true but R is false
C. A is true but R is false
33.
A. Both A and R are true and R is the correct explanation of A.
34.

A. Both A and R are true and R is the correct explanation of A.
35.

36. D. Dog fish, Toad, Lizard

37.
C- II and III

38.
A. I only
A. concave lens of focal length -50 m
39.
B. 50 cm in front of the mirror
40.
C- Saprotroph.
41.

42. B. urine formation by filtration.

B. 20 cm
43.

44. A. When power increases the focal length decreases.
45. B. II
8
46. C- 1.2 x 10 m/s

47. C- When object is placed between the focus and centre of curvature.

48. B-Sodium > Magnesium > Zinc > Iron

CASE BASED STUDY QUESTIONS -I

A. Increases
49.

50. B. Black
C. Rainbow formation
51.
C- Scattering of light
52.
CASE BASED STUDY QUESTIONS -II

A. Silver
53.
D. (ii) and (iv)
54.

C- Only (ii)
55.

B. loses electrons
56.

CASE BASED STUDY QUESTIONS -III

57. A. Haemoglobin in RBC

B. White Blood Corpuscles
58.

B- Platelets
59.
D- All contents of blood except RBC and certain proteins.
60.