ELECTROMAGNETIC WAVES MCQs 11 min Score: 0 Attempted: 0/11 Subscribe 1. . The field around a moving charge is called: (A) Gravitational field (B) Magnetic field (C) Electric field (D) Atomic fieldShow All Answers 2. . The magnetic effect near the current-carrying conductor was discovered by: (A) Coulomb (B) Faraday (C) Hans Oersted (D) AmpereShow All Answers 3. . Which one of the following metals is nonāmagnetic substance? (A) Brass (B) Cobalt (C) Nickel (D) IronShow All Answers 4. . The magnetic field at a point due to a current-carrying conductor is proportional to: (A) Thickness of the conductor (B) Resistance of the conductor (C) Distance from the conductor (D) Current through a conductorShow All Answers 5. . Two lines of magnetic force: (A) Can cross each other (B) Can never cross each other (C) Always cross each other (D) None of the aboveShow All Answers 6. . A changing magnetic flux produces around itself an induced: (A) Magnetic field (B) Electromotive force (C) Gravitational field (D) Electric fieldShow All Answers 7. . The electric field induced around a changing magnetic flux varies as: (A) r (B) r³ (C) r² (D) rā»Ā¹Show All Answers 8. . The electromagnetic waves travel in free space with the speed of: (A) Light (B) Sound (C) Positive rays (D) Cathode raysShow All Answers 9. . The average temperature of the earth atmosphere is: (A) 250 K (B) 200 K (C) 350 K (D) 300 KShow All Answers 10. . The minimum frequency of radio waves is: (A) 1 MHz (B) 5 MHz (C) 50 MHz (D) 10 MHzShow All Answers 11. . In electromagnetic waves, the electric and magnetic field are: (A) Perpendicular (B) Opposite (C) Parallel (D) Anti-parallelShow All Answers