Question

10 class Science Practical no 2​

Answer 1

Answer:

Please Mark me brainliest

Explanation:

CBSE Class 10 Science theory and practical examinations will be conducted tomorrow - 04th March 2020. At this time, when most of the students would be busy with the last-minute preparations of their Science theory exam, hardly they would get sufficient time to prepare for the practical exam. However, students should remember that practical assessment forms an essential part of the CBSE Class 10 Science Board Exams. Do not forget the fact that the marks obtained in the practical examination will be added to your scores obtained in the theory paper to calculate the final results.

Answer 2

List of Experiments for CBSE class 10 Science Practicals

1. A. Finding the pH of the following samples by using pH paper/universal indicator: (not included for this academic year)

(i) Dilute Hydrochloric Acid

(ii) Dilute NaOH solution

(iii) Dilute Ethanoic Acid solution

(iv) Lemon juice

(v) Water

(vi) Dilute Hydrogen Carbonate solution

B. Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:

a) Litmus solution (Blue/Red)

b) Zinc metal

c) Solid sodium carbonate

2. Performing and observing the following reactions and classify them into:

A. Combination reaction

B. Decomposition reaction

C. Displacement reaction

D. Double displacement reaction

(i) Action of water on quicklime

(ii) Action of heat on ferrous sulphate crystals

(iii) Iron nails kept in copper sulphate solution

(iv) Reaction between sodium sulphate and barium chloride solutions

3. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions:

i) ZnSO4(aq)

ii) FeSO4(aq)

iii) CuSO4(aq)

iv) Al2 (SO4)3(aq)

Arranging Zn, Fe, Cu and Al (metals) in decreasing order of reactivity based on the above result.

4. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determine its resistance. Also plotting a graph between V and I.

5. Determination of the equivalent resistance of two resistors when connected in series and parallel.

6. Preparing a temporary mount of a leaf peel to show stomata.

7. Experimentally show that carbon dioxide is given out during respiration.

8. Study of the following properties of acetic acid (ethanoic acid):

i) Odour

ii) Solubility in water

iii) Effect on litmus

iv) Reaction with Sodium Hydrogen Carbonate

9. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.

10. Determination of the focal length of:

i) Concave mirror

ii) Convex lens

by obtaining the image of a distant object

11. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result.

12. Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.

13. Tracing the path of the rays of light through a glass prism.

14. Finding the image distance for varying object distances in case of a convex lens and drawing corresponding ray diagrams to show the nature of image formed. (not included for this academic year)

15. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean). (not included for this academic year)

Each experiment in the CBSE class 10 Science lab manual is described in the following points:

Class 10 Science Practical Important Questions

At the end of each experiment, a few questions are provided in the lab manual. These questions are given to test how much students have learned from a particular experiment.

Q1) What is your observation when copper is added to iron (II) sulphate solution?

Q2) Why is sulphur dioxide collected by upward displacement of air?

Q3) How does the carbon dioxide gas enter the leaves?

Q4) Which by-product of fermentation is useful in brewing industry?

Q5) Why are the incident and emergent rays parallel to each other in case of a rectangular glass slab?

Q6) On what factors does the refractive index of a medium depend?

Q7) Why is it advised to clean the ends of connecting wires before connecting them?

Q8) How are magnetic field lines of a straight current carrying wire different from the field lines of a bar magnet?