Question

Sci practical no 4 10th std

Answer 1

List of Experiments
Experiment 1. Finding the pH of the following samples by using pH paper / universal indicator:
a) Dilute Hydrochloric Acid
b) Dilute NaOH solution
c) Dilute Ethanoic Acid Solution
d) Lemon juice
e) Water
f) Dilute Hydrogen Carbonate solution
Studying the properties of acids and bases (HCl & NaOH) by their reaction with:
a) Litmus solution (Blue/Red)
b) Zinc metal
c) Solid sodium carbonate
Experiment 2. Performing and observing the following reactions and classifying them into :
a) Combination reaction
b) Decomposition reaction
c) Displacement reaction
d) Double displacement reaction
(i) Action of water on quick lime
(ii) Action of heat on ferrous sulphate crystals 70
(iii) Iron nails kept in copper sulphate solution
(iv) Reaction between sodium sulphate and barium chloride solutions
OR
Experiment 3. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions :
a) ZnSO4 (aq)
b) FeSO4 (aq)
c) CuSO4 (aq)
d) Al2(SO4)3 (aq)
Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result.
CBSE Class 10 Science Syllabus 2018-2019
Experiment 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.
Experiment 5. Determination of the equivalent resistance of two resistors when connected in series and parallel.
Experiment 6. Preparing a temporary mount of a leaf peel to show stomata.
Experiment 7. Experimentally show that carbon dioxide is given out during respiration.
Experiment 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
Experiment 9. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.
Experiment 10. Determination of the focal length of :
i) Concave mirror
ii) Convex lens by obtaining the image of a distant object.
Experiment 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.
Experiment 12. Studying (a) binary fission in Amoeba, and (b) budding in yeast with the help of prepared slides.
Experiment 13. Tracing the path of the rays of light through a glass prism.
Experiment 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.
Experiment 15. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean).