(A) Choose the correct alternative and rewrite the following.
(1) The device used for producing current is called a _______.
(a) Voltmeter
(b) Ammeter
(c) Galvanometer
(d) Generator
(2) At the time of short circuit, the current in the circuit _______.
(a) increases
(b) decreases
(c) remains same
(d) increases in steps
(3) The direction of the magnetic field around a straight conductor carrying current is given by _______.
(a) Right hand rule
(b) Fleming’s left hand rule
(c) Fleming’s right hand rule
(d) none of these
(B) Say true or false. If false, write the correct sentence
(1) Magnetic poles exist in pairs.
(2) Magnetic field increases as we go away from a magnet.
(3) Magnetic lines of force always cross each other.
(4) Electric generator is used to generate current.
(C) Find the odd one out
(1) Loudspeaker, microphone, electric motor, bar magnet.
(2) Armature coil, brushes, commutator, direct current.
(3) Fuse, insulating material, rubber shoes, generator.
(4) Voltmeter, ammeter, galvanometer, thermometer.
(A) Choose the correct alternative and rewrite the following.
(1) The device used for producing current is called a _______.
(a) Voltmeter
(b) Ammeter
(c) Galvanometer
(d) Generator
(2) At the time of short circuit, the current in the circuit _______.
(a) increases
(b) decreases
(c) remains same
(d) increases in steps
(3) The direction of the magnetic field around a straight conductor carrying current is given by _______.
(a) Right hand rule
(b) Fleming’s left hand rule
(c) Fleming’s right hand rule
(d) none of these
(B) Say true or false. If false, write the correct sentence
(1) Magnetic poles exist in pairs.
(2) Magnetic field increases as we go away from a magnet.
(3) Magnetic lines of force always cross each other.
(4) Electric generator is used to generate current.
(C) Find the odd one out
(1) Loudspeaker, microphone, electric motor, bar magnet.
(2) Armature coil, brushes, commutator, direct current.
(3) Fuse, insulating material, rubber shoes, generator.
(4) Voltmeter, ammeter, galvanometer, thermometer.
(1) The device used for producing current is called a generator.
(2) At the time of short circuit, the current in the circuit increases.
(3) The direction of the magnetic field around a straight conductor carrying current is given by Right hand rule
(B)
(1) True
(2) False
Correct statement: Magnetic field decreases as we go away from a magnet.
(3) False
Correct statement: Magnetic lines of force never cross each other.
(4) True
(C) (1) Bar Magnet
Reason: It is a magnet while the rest are devices working on electromagnetism.
(2) Direct current
Reason: The rest are parts of a generator.
(3) Generator
Reason: It produce current while the rest are safety measures in using electricity.
(4) Thermometer
Reason: It is a temperature measuring instrument while the rest are devices working on electromagnetism.
(1) The device used for producing current is called a generator.
(2) At the time of short circuit, the current in the circuit increases.
(3) The direction of the magnetic field around a straight conductor carrying current is given by Right hand rule
(B)
(1) True
(2) False
Correct statement: Magnetic field decreases as we go away from a magnet.
(3) False
Correct statement: Magnetic lines of force never cross each other.
(4) True
(C) (1) Bar Magnet
Reason: It is a magnet while the rest are devices working on electromagnetism.
(2) Direct current
Reason: The rest are parts of a generator.
(3) Generator
Reason: It produce current while the rest are safety measures in using electricity.
(4) Thermometer
Reason: It is a temperature measuring instrument while the rest are devices working on electromagnetism.
