Q. The device that converts alternating current (AC) to direct current (DC) is
(A) inverter
(B) converter
(C) rectifier
(D) amplifier
The answer is: (C) rectifier ☑
Q. The device that converts direct current (DC) to alternating current (AC) is
(A) inverter
(B) converter
(C) rectifier
(D) amplifier
The answer is: (A) inverter ☑
Q. What is the rest energy of a substance of mass 2 kg?
(A) 10 × 1012 joule
(B) 10 × 1016 joule
(C) 18 × 1012 joule
(D) 18 × 1016 joule
The answer is: (D) 18 × 1016 joule ☑
Q. If a force acting on an object of mass 12 kg produces an acceleration of 5 m/s2. Then the same force applied to an object of mass 10 kg will produce an acceleration of _____ m/s2.
(A) 5
(B) 6
(C) 7
(D) 8
The answer is: (B) 6 ☑
Q. The mass of the Earth is
(A) 5.98×1020 kg
(B) 5.98×1022 kg
(C) 5.98×1024 kg
(D) 5.98×1026 kg
The answer is: (C) 5.98×1024 kg ☑