Q. If we add all the 7 colors of rainbow (red, yellow, blue, green, orange, violet and indigo), the resultant color would be?
(A) White
(B) Black
(C) Maroon
(D) Dark Blue
The answer is: (A) White ☑
Q. When white light passes through a prism, it splits into ________ colors.
(A) 3
(B) 5
(C) 7
(D) 9
The answer is: (C) 7 ☑
Q. A camera uses a ________ to form an image on a piece of film at the back.
(A) convex lens
(B) concave lens
(C) diverging lens
(D) none of these
The answer is: (A) convex lens ☑
Q. Short-sight defect could be corrected by a
(A) convex lens
(B) concave lens
(C) converging lens
(D) none of these
The answer is: (B) concave lens ☑
Q. In humans, heart functions as a source of
(A) battery
(B) charge
(C) electric generator
(D) electromotive force
The answer is: (D) electromotive force ☑