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

Explanation:

# 50 percent

# 0 degree celcius

# baking soda

Answer 2

Answer:

1. 40°
2. 4
3. CO2

Explanation:

p = 50 and 60w

p.d = 40v

p(eq) = 110w

p = vi

I = p/v

I = 110/40 = 11/4A