V CARE INTERNATIONAL SCHOOL, MULAD
Standard : X-Eng. Med. ACADEMIC YEAR : 2025-26 Date : 22-08-2025
Curriculum : CBSE UNIT TEST : 02 Total : 25 Marks
Group : A / B SUBJECT : SCIENCE Time : 1 Hrs.
PART - A
Select the appropriate option from the given multiple choice. (06 x 01 = 06)
1. The formula of washing soda is:
(a) NaHCO3.6H2O (b) Na2CO3.6H2O (c) NaHCO3.10H2O (d) Na2CO3.10H2O
2. Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called
(a) Acetic acid (b) Methanoic acid (c) Oxalic acid (d) Tartaric acid
3. The water of crystallisation is present in
(i) Bleaching Powder (ii) Plaster of Paris (iii) Washing Soda (iv) Baking Soda
(a) (ii) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (i) and (iv)
4. The laws of reflection hold true for:
(a) plane mirrors only (b) concave mirrors only
(c) convex mirrors only (d) all reflecting surface
5. A concave mirror gives real, inverted and same size image if the object is placed:
(a) At F (b) At infinity (c) At C (d) Beyond C
6. The radius of curvature of a concave lens is 20 cm, then the focal length will be:
(a) -10cm (b)10cm (c) -40cm (d) 40cm
PART - B
Section - A
Answer any two of the following questions in Brief. (02 x 02 = 04)
7. Why do acids do not show acidic behaviour in the absence of water?
OR
Why acids are not stored in metal container? Give reason.
8. State the two laws of reflection of light.
OR
Write two important uses of both concave mirror and convex mirror.
Section - B
Answer any two of the following questions in Short. (02 x 03 = 06)
9. State the chemical property in each case on which the following uses of baking soda are based upon:
(i) as an anti-acids
(ii) as a constituent in making baking powder
(iii) in soda-acid fire-extinguishers
OR
A milkman adds a very small amount of banking soda to fresh milk.
(a) Why does he shift the pH of fresh milk from 6 to slightly alkaline?
(b) Why does the milk take long time to set as curd?
10. State three important characteristics of image formation in convex lens with suitable sketch.
OR
Standard : X-Eng. Med. ACADEMIC YEAR : 2025-26 Date : 22-08-2025
Curriculum : CBSE UNIT TEST : 02 Total : 25 Marks
Group : A / B SUBJECT : SCIENCE Time : 1 Hrs.
PART - A
Select the appropriate option from the given multiple choice. (06 x 01 = 06)
1. The formula of washing soda is:
(a) NaHCO3.6H2O (b) Na2CO3.6H2O (c) NaHCO3.10H2O (d) Na2CO3.10H2O
2. Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called
(a) Acetic acid (b) Methanoic acid (c) Oxalic acid (d) Tartaric acid
3. The water of crystallisation is present in
(i) Bleaching Powder (ii) Plaster of Paris (iii) Washing Soda (iv) Baking Soda
(a) (ii) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (i) and (iv)
4. The laws of reflection hold true for:
(a) plane mirrors only (b) concave mirrors only
(c) convex mirrors only (d) all reflecting surface
5. A concave mirror gives real, inverted and same size image if the object is placed:
(a) At F (b) At infinity (c) At C (d) Beyond C
6. The radius of curvature of a concave lens is 20 cm, then the focal length will be:
(a) -10cm (b)10cm (c) -40cm (d) 40cm
PART - B
Section - A
Answer any two of the following questions in Brief. (02 x 02 = 04)
7. Why do acids do not show acidic behaviour in the absence of water?
OR
Why acids are not stored in metal container? Give reason.
8. State the two laws of reflection of light.
OR
Write two important uses of both concave mirror and convex mirror.
Section - B
Answer any two of the following questions in Short. (02 x 03 = 06)
9. State the chemical property in each case on which the following uses of baking soda are based upon:
(i) as an anti-acids
(ii) as a constituent in making baking powder
(iii) in soda-acid fire-extinguishers
OR
A milkman adds a very small amount of banking soda to fresh milk.
(a) Why does he shift the pH of fresh milk from 6 to slightly alkaline?
(b) Why does the milk take long time to set as curd?
10. State three important characteristics of image formation in convex lens with suitable sketch.
OR
