Question

3. A ray of light makes an angle of 50° with the surface S1 of the glass slab. Its angle of incidence

will be _______.

(A) 50° (B) 40°

(C) 140° (D) 0°

4. Water expands on reducing its temperature below _______°C.

(A) 0 (B) 4

(C) 8 (D) 12



5. The carbon compound is used in daily life is _______.

(A) Edible oil (B) Salt

(C) Carbon dioxide (D) Baking soda

2. Attempt any five of the following questions: [10]

1. Two tungsten bulbs of power 50 W and 60 W work on 220 V potential diff​

Answer 1

Answer:

• a.50° because it law of light that angle of reflection=angle of incidence .
• 0c°

hope it's helpful

Answer 2

Answer:

bro ur first answer is 50

and second is 0 degree because the temperature of water starts from 0 only so ur second answer is

0

third one is salt we will use it for cooking