Draw a linear pair of angles. Bisect each of the two angles. Verify that the two bisecting rays are perpendicular to each other.

(c) The source of ozone is the oxygen in the atmosphere. Ozone layer protects the living being from the UV radiation which reaches the earth.

Does this perpendicular bisector contain another diameter of the circle - Yes

(i) True  (ii) False  (iii) False  (iv) true

(i) Obtuse angle  (ii) 180o  (iii) uncommon

Correct answer is (c) (iii) only

If two angles of a triangle are equal, the third angle is also equal to each of the other two angles. False

Correct Option  (c)  λ1 > λ2 Explanation: As  γ- rays have higher energy than X-rays hence  λ1 will be smaller for  γ-rays.

The Tropical zone gets vertical rays of the sun, while temperate and polar zones receive slanting rays of the sun.

(a) Gamma rays, X-rays, infrared rays, micro waves, radio waves. (b) Microwave is used for satellite communication.

(i)Ultraviolet rays-wavelength range 100 Å to 4000 Å (ii)Visible light-wavelength range 4000 Å to 8000 Å (iii)Infrared radiations-wavelength range 8000 Å to 107 Å