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Published on: 25/09/2019
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.
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?
2.
Define electric field.
3.
What are electric lines of force?
4.
Name any two appliances which work under the principle of heating effect of current.
5.
State Ohm’s law.
6.
A bird sitting on a high power electric line is still safe. How?
7.
Find the value of current in the circuit.
8.
In India the frequency of alternating current is
220 Hz
50 Hz
5 Hz
100 Hz
9.
Electroplating is an example for
heating effect
chemical effect
flowing effect
magnetic effect
10.
Potential near a charge is the measure of its________ to bring a positive charge at that point.
force
ability
tendency
work
11.
In current electricity, a positive charge refers to,
presence of electron
presence of proton
absence of electron
absence of proton
12.
Potential difference
13.
Electric power
14.
Current in an electric circuit
15.
Resistor
16.
Electric current
17.
Potential difference
18.
Electric Charge
19.
Electrons in outer orbits are called free electrons
20.
For current to flow, one needs an open circuit
21.
Electric fuse works on Joule heating principle
22.
The anode in electrolyte is negative
23.
Electrically neutral means it is either zero or equal positive and negative charges
24.
_________is work done per unit charge
25.
Resistors are connected in series, if the resistance of electric circuit is to be__________
26.
Trip switch is a______________safety device
27.
The e.m.f of a cell is analogues to________of a pipe line.
28.
Electrons move from__________ potential to __________ potential
29.
What is the charge of one electron?
30.
What do the circuit symbol 
represent?
31.
Name a device that helps to maintain a potential difference across conductors
32.
What is the SI unit for current?
33.
Name the force which acts between two point charges obey Newton's third law.
1.
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
2.
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.
3.
The lines representing the electric field are called electric lines of force
4.
The appliances which work under the principle of to after, heating effects are iron box, water heater, toaster etc.
5.
Ohm's law states that electric potential difference across two points in an electrical circuit is directly proportional to the current passing through it that is
V ∝ I
The proportionality constant is the resistance (R) offered between two points. Hence Ohms law is written as
V = RI (or) V = IR
6.
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.
7.
In this circuit, the resistance of arm ABC
R1 & R2 is in series
RS = R1 + R2
=30+30 = 60 \(\Omega \)
\(\cfrac { 1 }{ { R }_{ P } } =\cfrac { 1 }{ { R }_{ 3 } } +\cfrac { 1 }{ { R }_{ S } } \)
= \(=\cfrac { 1 }{ 30 } +\cfrac { 1 }{ 60 } \)
\(\cfrac { 1 }{ { R }_{ P } } =\cfrac { 2+1 }{ 60 } =\cfrac { 3 }{ 60 } \)
\({ R }_{ P }=\cfrac { 60 }{ 3 } =20\Omega \)
Current I \(=\cfrac { V }{ { R }_{ P } } =\cfrac { 2 }{ 20 } =0.1A\)
I =0.1 A
8.
(b)
50 Hz
9.
(b)
chemical effect
10.
(a)
force
11.
(b)
presence of proton
12.
Volt
13.
Watt
14.
Galvanometer
15.
Constantan
16.
ampere
17.
volt
18.
coulomb
19.
(a)
20.
(b)
21.
(a)
22.
(b)
23.
(a)
24.
( )
Potential difference
25.
( )
increased
26.
( )
electro-mechanical
27.
( )
pumping
28.
( )
higher, lower
29.
e = 1.6 x 10-19C
30.
Wire crossing without touching each other.
31.
Cell or battery
32.
ampere (A).
33.
Electrostatic force.
9th Standard Syllabus & Materials
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
