1. . The field around a moving charge is called:
(A) Gravitational field
(B) Magnetic field
(C) Electric field
(D) Atomic field
2. . The magnetic effect near the current-carrying conductor was discovered by:
(A) Coulomb
(B) Faraday
(C) Hans Oersted
(D) Ampere
3. . Which one of the following metals is non–magnetic substance?
(A) Brass
(B) Cobalt
(C) Nickel
(D) Iron
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 conductor
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 above
6. . A changing magnetic flux produces around itself an induced:
(A) Magnetic field
(B) Electromotive force
(C) Gravitational field
(D) Electric field
7. . The electric field induced around a changing magnetic flux varies as:
(A) r
(B) r³
(C) r²
(D) r⁻¹
8. . The electromagnetic waves travel in free space with the speed of:
(A) Light
(B) Sound
(C) Positive rays
(D) Cathode rays
9. . The average temperature of the earth atmosphere is:
(A) 250 K
(B) 200 K
(C) 350 K
(D) 300 K
10. . The minimum frequency of radio waves is:
(A) 1 MHz
(B) 5 MHz
(C) 50 MHz
(D) 10 MHz
11. . In electromagnetic waves, the electric and magnetic field are:
(A) Perpendicular
(B) Opposite
(C) Parallel
(D) Anti-parallel