ELECTROMAGNETISM
Q.
11 Choose the correct alternative &
rewrite the following.
«1. The
device used for producing a current is called a ______________.
a.
voltmeter b. ammeter c. galvanometer d. generator
«2. At
the time of a 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 thumb rule b. Fleming’s
left hand rule
c.
Fleming’s right hand rule d. none of
these.
4. In
India, the frequency of alternating current is ______________.
a.
50 Hz b. 500 Hz c. 5 Hz d.
0.5 Hz
5. The
direction of motion of a current carrying conductor placed in a magnetic field is given by ______________.
a.
Ohm’s law b. Coulomb’s law
c.
Fleming’s left hand rule d. Fleming’s
right hand rule.
6. Out
of the following appliances ______________ does not work on an electric motor.
a.
television b. refrigerators c. c.
hairdryers d. electric fan
7. A
galvanometer is used ______________.
a.
to measure the resistance of a conductor b. to regulate the intensity of a current
c.
to detect the presence of an electric current d. to measure a potential difference
8. In
generator ______________.
a.
mechanical energy is transformer into electrical energy.
b.
electrical energy is transformed into chemical energy.
c.
mechanical energy is transformed into light energy.
d.
electrical energy is transformed into heat energy.
9. In
a galvanometer , the zero mark is______________.
a.
to the right b. to the left c. in the middle d. none of these
10. The
direction of induced current in a conductor is given by ______________.
a.
Coulomb’s law b. Fleming’s c. Flemings left hand rule d. Ohm’s law
11. The
relation between an electric current & a magnetic field was first
established by ______________.
a.
Oersted b. Joule c. Ohm d. Fleming
12. An
electric bell works on ______________ effect of an electric current.
a.
optical b. chemical c. magnetic d. heating
13.
An electric crane is used ______________.
a.
to cut an iron bar into pieces b. to
load & transport scrap & heavy iron material.
c.
to generate electricity d. to drive an electric train.
Answer: 1.
d- generator 2. a-increases 3. a- right hand thumb rule 4. a- 50 Hz.
5.
c- Fleming’s left hand rule 6.
a- television
7.
c- to detect the presences of an electric current
8. a-
mechanical energy is transformed into electrical energy.
9. c- in the middle 10. b- Flemings right hand rule 11. a- Oersted 12.
c- magnetic 13. b- to load &
transport scrap & heavy iron material.
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