12. ELECTROMAGNETISM Objective Type Questions 1. Which of the following coverts electrical energy into mechanical energy? A) Motor B) Battery C) Generator D) Switch
[ A ]
2. Which of the following coverts mechanical energy into electrical energy? A) Motor B) Battery C) Generator D) Switch
[ C ]
3. The magnetic force on a current carrying wire placed in uniform magnetic field if the wire is oriented perpendicular to magnetic field is _________________ [ B A) 0 B) ILB C) 2ILB D) ILB/2 4. Electric power p =_________ YΦ YΦ B) p = [ . YZ A) p =I. YZ
C) I = p.
YΦ YZ
]
[ A ]
\[
D) dΦ = Y]
5. Relation between flux linked with the coil (ε) and no of turns (N) is ___________ YΦ YΦ YΦ YΦ A) ε = B) ε =^ . YZ C) ε =N. YZ D) N = ε. YZ YZ
[ C ]
6. Magnetic field is a ____________ quantity. A) Vector B) Scalar
[ A ] C) Dimension less
7. The magnetic field inside a ________ is uniform. A) Magnet B) Solenoid C) Coil 8. Magnetic field lines are ____________. A) Closed loops B) Open loops
D) unit law [ B ] D) Current carrying conductor [
C) Parallel
D) None of these
9. The relation between Weber and teals is _________. A) Weber.m2 = Tesla B) wb = Tesla × m2 C)1Tesla = 1m2/ wb 10. _______ law gives direction of induced current. A) Faraday’s law B) Kirchhoff’s law C) Lenz’s law
A ]
[ B
]
D) wb = Tesla [ C ] D) Lorentz law
11. The magnetic lines are formed around the magnet is technically called_______ [ A) Closed loops B) Electrical field lines C) Open loops D) Magnetic field lines
12. Which finger gives the direction of current in Ampere’s right hand rule? A) Thumb B) Fore C) Index D) All
D ]
[ A ]
13. Magnetic field induction at a point nearer a straight current carrying conductor depends on __________________ [ C ] A) Distance B) Current C) Both D) None 14. A current carrying wire produces ________ A) An electric field B) A magnetic field
[ B C) A and B
]
D) Neither electric nor magnetic field
15. Which of the following rule is used in the working of motor? A) Fleming’s left hand rule B) Fleming’s right hand rule C) Faraday law of electromagnetic induction D) Lenz’s law
[
B ]
16. A device used for producing current is ________ A) Generator B) Volt meter C) Ammeter
[ A ] D) Galvanometer
17. A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid is ______ [ A ] A) No change B) Will decrease C) Will increase D) Uncertain
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
9440234404
36
Tenth Class
Bit Bank
18. The metallic half rings in a motor are called _____ A) Carbob brushes B) Commutator C) Shaft
Physical Science [ B
]
D) Galvenometer
19. Magnetic flux(Φ Φ ) is the product of magnetic field induction(B) and _____________ [ A) Area B) EMF C) Current D) Potential difference
A ]
20. Weber/ (meter)2 _____________ A) Gauss B) 1Volt/Ampere
C ]
[ C) Tesla
D)Joule / Coloumb
25. The magnetic force on the charge moving parallel to a magnetic field is _______ _` A) Bqv sinθ B) Bqv C) Zero D) a
[ C ]
26. The current in the wire depends_______ A) Only on the potential difference applied C) On both of them
[ C
]
[ A
]
[ C
]
29. The charge is moving along the direction of magnetic field. Then force acting on it is __ [ C A) strong B) weak C) zero D) unknown
]
B) Only on the resistance of the wire D) None of these
27. The SI unit of magnetic field induction is_______ A) Tesla B) Weber C) Henry
D) No units
28. Magnetic flux is the product of magnetic field induction and _______ A) length B) volume C) area D) height
33. A current carrying wire of length L is placed perpendicular to a uniform magnetic field B. Then the force acting on the wire with current ‘i’ is F = _________ [ B _ A) BL sin θ B) Bi L C) Bi L tan θ D) b 34. Faraday's law of induction is the consequence of _______ [ B A) energy B) conservation of energy C) conservation of mass D) energy-mass 35. Generators works on the principle of _____________ A) Electromagnetic induction B) Mutual Induction C) Conservation of mass D) energy-mass 36. The S.I unit of magnetic field induction is _________________ C) Coulomb A) Weber B) Weber/m2
] ]
[ A ]
[ B
]
37. Magnetic field is produced by the flow of current. Thisphenomenon was discovered by__[ B A) Coulomb B) Oersted C) Faraday D) Maxwell
]
D) N/m
38. Which of the following instruments works by electromagnetic induction? __________ A) Dynamo B) Moving Coil Galvanometer C) Telephone Receiver D) Simple Motor
[ A ]
39. For making strong electromagnet, the material of the core should be____________ A) Brass B) Laminated Steel Strips C) Soft Iron D) Steel
[ C
]
40. A device for producing electric current is called_____________ A) Generator B) Voltmeter C) Galvanometer
[ A
]
D) Ammeter
41. A magnetic filed is a ______________ quantity. A) Vector B) Scalar
[ A D) Both A and B
]
[ B
]
43. The device based on the principle of electromagnetic induction is ___________ [ A A) Electric Generator B) Voltmeter C) Voltmeter D) Ammeter
]
C) Tensor
42. ______________ Law gives direction of induced current. A) Newton’s B) Lenz’s C) faraday’s
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
D) Nobel
9440234404
37
Tenth Class
Bit Bank
Physical Science
44. Magnetic flux is the product of magnetic field induction and____________ [ A A) Area B) Intensity C) Flux D) None of these
]
45. Which of the following is required to reverse the current in the electric motor? A) Split rings B) Commutator C) Magnets D) All
]
[ B
46. The direction of the field due to solenoid is determined by using _____________ [ A ] A) Right hand rule B) Left hand rule C) Both A and B D) None of these 47. One end of the solenoid behaves like a north pole and other behaves like a ___________ [ B ] A) North pole B) South pole C) Both A and B D) None of these 48. A _______________is a long wire wound in a close packed helix. A) Solenoid B) Closed coil C) Straight wire
[ A ] D) None of these
49. The magnetic field lines are ___________ A) Open loops B) Closed loops
C) Both A and B
[ B D) None of these
50. The current carrying wires produce ___________ A) Magnetic field B) Electric field
C) Both A and B
[ A ] D) None of these
Prepared by :- Gali Sreekar M.Sc, M.Sc, B.Ed Chirala mandal, Prakasam.
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