Question

Theme: Natural Phenomena, Unit II: Natural Phenomena:
1. Define the principal focus of a concave mirror
2. The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
3. Name a mirror that can give an erect and enlarged image of an object
4. The magnification produced by a plane mirror is +1. What does it mean?
5. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm find
the position and nature of the image.
6. What do you mean by a balanced chemical equation?
7. What are the implications of a balanced chemical equation? inequam
8. Balance the following chemical equation-
a) HNO 3 + Ca(OH)2 Ca(NO3)2 + H2O
b) NaOH + H2SO4 → Na2SO4 + H2O
c) NaCl + Ag NO, → AgCl + NaNO3
d) BaCl2 + H2SO4 → Ba SO4 + HCI
9. Define nutrition. What are the differences between autotrophic and heterotrophic nutrition?
10. How is the small intestine designed to absorb digested food?
11. What are the different ways in which glucose is oxidized to provide energy in various
organisms?
12. How is oxygen and carbon dioxide transported in human being?
13. Draw a well labeled diagram of human alimentary canal.​

Answer 1

Answer:

q1ans Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the principal focus of the concave mirror.