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 : 59

Total: 60

What is the value and sign of (according to new Cartesian sign convention) magnification of the image formed by L2 ?

Value = Less than 1 and Sign = Positive
Value = More than 1 and Sign = Positive
Value = Less than 1 and Sign = Negative
Value = More than 1 and Sign = Negative

Solution:

Magnification can be defined as the ratio of size of the image to the size of the object. It is denoted by m. This magnification can tell us about the nature of the image based on the sign itself. If the ratio is negative then the image is real and inverted.
Image formed by lens L2 is virtual and enlarged. Thus, its magnification should be positive and more than 1 .

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