CBSE Class 10 Science 2021 Term 1 Solved Paper

It consists of three cases followed by questions. There are a total of 12 questions (Q. No. 49 to 60 ) in this section. Attempt any 10 questions from this section. The first attempted 10 questions would be evaluated. P-Did not react eiter with cold or hot water but reacted with steam
Q- Reacted with hot water and the metal started floating
R - Reacted violently with cold water
S- Did not react with water at all
Based on the above observation answer the following:
Case-I:
A student, took four metals P,Q,R, and S and carried out different experiments to study the properties of metals. Some of the observation were:
- All metal could not be cut with knife except metal R.
- Metal P combined with oxygen to form an oxide M2O3 which reacted with both acids and bases.
- Reaction with water.

Question : 56

Total: 60

Which part of the nephron in human kidney, serves the function of reabsorption of certain substances?

Glomerulus
Bowmans Capsule
Tubules
Collecting duct

Solution:

PCT (Proximal Convoluted Tubule) is a part of nephron in human kidney which serves the function of reabsorption of substance like amino acid, protein, glucose, mineral etc., from the blood.
Case-III:
A compound microscope is an instrument which consists of two lenses L1 and L2. The lens L1 called objective, forms a real, inverted and magnified image of the given object. This serves as the object for the second lens L2; the eye piece. The eye piece functions like a simple microscope or magnifier. It produces the final image, which is inverted with respect to the original object, enlarged and virtual.

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