9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
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NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
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TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
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Published on: 30/09/2019
Electric Charge and Electric Current
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
On what factors does the electrostatic force between two charges depend?
2.
Two resistors 12\(\Omega\) and 6\(\Omega\) are first connected in series and then in parallel. The current-voltage graph for the two connections will be represented by which lines in the graph?
3.
Define electric field.
4.
A bird sitting on a high power electric line is still safe. How?
5.
The resistance of a straight conductor is independent of__________
temperature
material
cross sectional area
shape of cross section
6.
In India the frequency of alternating current is
220 Hz
50 Hz
5 Hz
100 Hz
7.
The following is not a safety device.
Fuse
Trip switch
Ground connection
Wire
8.
In an electrolyte the current is due to the flow of
electrons
positive ions
both (a) and (b)
neither (a) nor (b)
9.
Rubbing of comb with hair.
creates electric charge
transfers electric charge
either (a) or (b)
neither (a) nor (b)
10.
Potential difference
11.
Electrical energy
12.
Potential difference
13.
Connecting wire
14.
Electric current
15.
Electric field
16.
Electric Charge
17.
A comb rubbed with hair and brought near pieces of paper attracts them, because both comb and paper get similarly charged
18.
A fuse is used in electric circuit to stop high current flowing through the circuit
19.
Electric fuse works on Joule heating principle
20.
The anode in electrolyte is negative
21.
Electrically neutral means it is either zero or equal positive and negative charges
22.
_________is work done per unit charge
23.
__________is the only non-metal that is a good conductor of electricity
24.
Trip switch is a______________safety device
25.
The e.m.f of a cell is analogues to________of a pipe line.
26.
Electrons move from__________ potential to __________ potential
27.
How is a voltmeter connected in the circuit to measure the potential difference between two points?
28.
What is the charge of one electron?
29.
What do the circuit symbol 
represent?
30.
Name a device that helps to maintain a potential difference across conductors
31.
What is the SI unit for current?
1.
The numerical value (magnitude) of electric force between two charges depend on the,
(i) value of charges on them,
(ii) distance between them and
(iii) nature of medium between them.
2.
Slope of V - 1 graph is resistance of the conductor.
Since slope of A is greater than the slope of B.
\(\therefore \) RA > RB
Series: Rs = 12 + 6 = 180\(\Omega \) \(\Rightarrow \)RA
Parallel:
\(\cfrac { 1 }{ { R }_{ P } } =\cfrac { 1 }{ 12 } +\cfrac { 1 }{ 6 } =\cfrac { 1+2 }{ 12 } =\cfrac { 3 }{ 12 } \)
\({ R }_{ P }=\cfrac { 12 }{ 3 } =4\Omega \Rightarrow { R }_{ B }\)
Hence, graph A represents series combination and graph B represents parallel combination
3.
Electric field is the region around a charged body within which its influence can be experienced (i.e) within which it can attract or repel another charged body.
4.
Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground (i.e.) the current is not flowing out of its body to any other material.
Current flows in a loop (which means the circuit is closed). A bird sitting on a transmission line does not complete the circuit. If the same bird keeps one leg on one line and another leg or any part of its body on another line or the neutral points, then it will get burnt.
5.
(d)
shape of cross section
6.
(b)
50 Hz
7.
(d)
Wire
8.
(c)
both (a) and (b)
9.
(c)
either (a) or (b)
10.
Volt
11.
Joule
12.
Voltmeter
13.
Copper
14.
ampere
15.
newton per coulomb
16.
coulomb
17.
(b)
18.
(a)
19.
(a)
20.
(b)
21.
(a)
22.
( )
Potential difference
23.
( )
Graphite
24.
( )
electro-mechanical
25.
( )
pumping
26.
( )
higher, lower
27.
Parallel
28.
e = 1.6 x 10-19C
29.
Wire crossing without touching each other.
30.
Cell or battery
31.
ampere (A).
9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
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TN 9th Tamil உள்ளத்தின் சீர் - மணிமேகலை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - ஏறு தழுவுதல் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
