Q. An element is identified by the number of _____ in its _____.
(A) protons, nucleus
(B) neutrons, nucleus
(C) electrons, atom
(D) positrons, atom
The answer is: (A) protons, nucleus ☑
Q. The attractive force that binds protons and neutrons in nucleus of an atom is known as
(A) Coulomb force
(B) electromagnetic force
(C) nuclear force
(D) electromotive force
The answer is: (C) nuclear force ☑
Q. The speed of light in air is
(A) 2.8×106 m/s
(B) 2.8×108 m/s
(C) 3.0×106 m/s
(D) 3.0×108 m/s
The answer is: (D) 3.0×108 m/s ☑
Q. The speed of light in water is
(A) 2.26×106 m/s
(B) 2.26×108 m/s
(C) 2.86×106 m/s
(D) 2.86×108 m/s
The answer is: (B) 2.26×108 m/s ☑
Q. Which device is often used to smooth out the sudden variations in line voltage?
(A) Breaker
(B) Capacitor
(C) Resistor
(D) Switch
The answer is: (B) Capacitor ☑