Question

8 Which statement is incorrect regarding the reflection of light?
(A) The incident ray and the reflected ray are on opposite sides of the normal. (B) If the angle of incidence is 90°then the reflected ray is emitted in the same direction.
(C) If the angle of incidence is 45°then the angle of reflection is 45º.
(D) If the angle of incidence is 35'then the angle of reflection is 55º.

9 Which of the following is not appropriate for the moon?
(A) Moon is visible due to reflected sunlight.
(B) The Earth along with the moon, revolves around the Sun.
(C) After full moon day, every night the size of the bright part of the moon, illuminated by the Sun, increases.
(D) On new moon day the moon appears black.

10 Which of the following are correct for the greenhouse effect?
(i) CO2 is mainly responsible for the greenhouse effect.
(ii) The gradual increase in the average temperature of the earth's atmosphere is called global warming.
(iii) Methane, nitrous oxide and water vapour are greenhouse gases like CO2 (iv) An increase in earth's temperature by as little as 0.5°C has no effect.

(A) (), (ii), (iii)
(B) (ii), (iii), (iv)
(C) (i), (iii), (iv)
(D) (i), (ii), (iii), (iv)​

Answer 1

Answer:

Q8,. (c)

Q9.  (D)

Q10. (C)