Magnetic Effects of Electric Current - CBSE Board Test Questions for class 10
Central Public School,Samastipur and Sadhana Devi Vidyapith Assignment SA-1
Chapter: Magnetic Effects of Electric Current
Chapter: Magnetic Effects of Electric Current
Section-A
[1marks]
1.
What does the direction of thumb indicate in the right-hand thumb rule?
2. What
is the frequency of alternating current in India?
3.
How will you use a solenoid to magnetize a steel bar?
4.
An alternating electric current has a frequency of 50 Hz. How many times does
it change its direction in one second?
5.
Name devices which produce: (i) alternating current, (ii) direct current.
6.
Name the physicist who discovered the magnetic effect of the electric current.
7.
A straight copper conductor is held parallel to the axis of a freely suspended
magnetic needle such that the conductor is under the needle and the current is
flowing from south to north. In which direction the north of magnetic needle will
move?
8.
If a copper conductor carrying a current is held in north-south direction, in
which direction will its magnetic field act?
9.
Why does the strength of electromagnet increase, when its soft iron core is
laminated?
10.
Why does a conductor carrying current experiences force when held in a magnetic
field at right angles to it?
Section-B
[2marks]
11.
What will be the frequency of an alternating current, if its direction changes
after every 0.01 s?
12. What
is a solenoid? Draw the pattern of magnetic field lines of a solenoid through
which a steady current flows.
13. A
coil of insulated wire is connected to a galvanometer. What would be seen if a
bar magnet with its south pole towards one face of the coil is:
(a)
Moved quickly towards it? (b) Moved quickly away from it? (c) placed near its
one face?
(d)
Name the phenomena involved.14. No two magnetic field lines can intersect each other.
Explain.
15.
Two circular coils A and B are placed close to each other. If the current in
the coil A is changed, will some current be induced in the coil B? Give
reasons.
Section-
C [3marks]
16.What
happens to the deflection of the compass needle placed at a point near current
carrying straight conductor
(a)
if the current is increased,
(b)
if the direction of current in the conductor is changed,
(c)
if compass is moved away from the conductor?
17. State
Fleming’s Right hand rule. Give one application of this rule. What is SI unit
of induced current?
18.
What is an electric fuse? What result do you expect if someone operates an
electric heater of power rating 2 kW, 220 V in a domestic electric circuit.
What has a fuse of current rating of 5A? Justify your answer.
19. Why does a current carrying conductor
kept in a magnetic field experience force? On what factors does the direction
of this force depend? Name and state the rule used for determination of
direction of this force.
20. With the help of a neat diagram
describe how you can generate induced current in a circuit.
21.Instruction:
Read the clues given below and fill up the blocks with appropriate word/term
to compete the crossword puzzle given below: One 'word' has been done for
you.
The
Clues
Across:
3
This principle is useful in solar cooker but can be harmful on earth (5, 5, 6)
5
Element used to make solar cells
6
A black surface ____________ heat.
7
This fossil fuel mode industrial revolution possible
8
A green house gas
10
High rise structures constructed on rivers to produce hydro electricity.
Down:
1.
Its construction, on River Ganga, was opposed
2.
Clean Fuel (abbreviation)
3.
Bio-gas is commonly called
4.
Nuclear power generation is based on this process
9.
This energy is converted to electrical energy in a thermal power plant
please provide the answers in brief of above questions...
ReplyDeletei love u
Deleteneed the answers
ReplyDeleteWow its great post. ..........
ReplyDelete.
.
Feel free to visit this too => www.myhsebnotes.com for reference notes.