Q. Which radiation has the lowest frequency in the electromagnetic spectrum?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays
The answer is: (D) Radio rays ☑
Q. Which rays are useful in cancer treatment?
(A) X-rays
(B) Gamma rays
(C) Ultraviolet rays
(D) Radio rays
The answer is: (B) Gamma rays ☑
Q. The speed of sound will be maximum if passing through
(A) vacuum
(B) air
(C) water
(D) iron
The answer is: (D) iron ☑
Q. The wire used to make the filament of a light bulb is made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay
The answer is: (C) tungsten ☑
Q. The wire used to make heating elements in electric kettles and irons are made of
(A) nichrome
(B) chromel
(C) tungsten
(D) fire-clay
The answer is: (A) nichrome ☑