12th Standard Syllabus & Materials
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 13/10/2020
12th Standard Physics Current Electricity English Medium Free Online Test One Mark questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Physics 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 Physics Test1.
Kirchhoff's I law is named as_____________
ohm's law
voltage law
resistance law
current law
2.
The temperature coefficient of resistance increases for the metals when________
the temperature increases
the temperature decreases
does not depend upon the temperature
either (a) or (b)
3.
Super conductors can be used as storage elements in_________
TV
camera
computers
computers
4.
The specific resistance for the insulators is in the range of________
10-610-8\(\Omega m\)
108-1014\(\Omega m\)
10-8-10-14\(\Omega m\)
10-8-1014\(\Omega m\)
5.
A potential of 1 kV is applied between the ends of conductor of length 20 cm. The drift velocity of electron in this field is 3.52 x 106 m/s. The relaxation time for the free electrons is
2 nano sec
4 nano sec.
6 nano sec
8 nano sec.
6.
Kirchoff's II law isa consequence of conservation of________
charges
momentum
energy
power
7.
Melting point of a tungsten filament inside a glass bulb is_________
3360o C
3340oC
3380oC
3370oC
8.
Which energy is used to liberate the outer electron from the individual atoms?
Thermostatic external energy
Thermodynamic internal energy
Thermodynamic external energy
Thermostatic internal energy
9.
By increasing the temperature, the specific resistance of a conductor and a semiconductor ___________________.
increases for both
increases, decreases respectively
decreases for both
decreases, increases respectively
10.
The ratio of voltage and current in a dosed circuit is _______________.
decreases
increases
remains constant
varies
11.
Fuse wire is an alloy of
37 % lead and 63 % tin
63 % lead and 37 % tin
37 % copper and 63 % tin
63 % copper and 37 % tin
12.
Nichrome wire is used as the heating element because it has _____________.
low specific resistance
low melting point
high specific resistance
high specific resistance
13.
Resistance between the points A and B in the given figure is
\(9\Omega \)
\(2\Omega \quad \)
\(3\Omega \)
\(6\Omega \)
14.
The potential difference across the terminals of a cell varies with the current drown from the cell according to the graph.
15.
Which of the following has negative temperature coefficient of resistance?
copper
tungsten
carbon
silver
16.
The electrical resistivity of a thin copper wire and a thick copper wire are respectively \({ P }_{ 1 }\Omega \) m and \({ P }_{ 2 }\Omega \) m Then_____________.
\({ P }_{ 1 }>{ P }_{ 2 }\)
\({ P }_{ 2 }>{ P }_{ 1 }\)
\({ P }_{ 1 }={ P }_{ 2 }\)
\(\cfrac { { P }_{ 1 } }{ { P }_{ 2 } } \)
17.
The temperature coefficient of resistance of a wire is 0.00125 per °C. At 20°C, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at ______.
800 °C
700 °C
850 °C
820 °C
18.
There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?
1.5 Ω
2.5 Ω
3.5 Ω
4.5 Ω
19.
A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of different colours for its identification. The colour code sequence will be ______.
Yellow – Green – Violet – Gold
Yellow – Violet – Orange – Silver
Violet – Yellow – Orange – Silver
Green – Orange – Violet - Gold
20.
A wire of resistance 2 ohms per meter is bent to form a circle of radius 1m. The equivalent resistance between its two diametrically opposite points, A and B as shown in the figure is
\(\pi \Omega\)
\(\frac{\pi}{2}\Omega\)
2\(\pi \Omega\)
\(\frac{\pi}{4}\Omega\)
1.
(d)
current law
2.
(a)
the temperature increases
3.
(c)
computers
4.
(b)
108-1014\(\Omega m\)
5.
(b)
4 nano sec.
6.
(c)
energy
7.
(c)
3380oC
8.
(b)
Thermodynamic internal energy
9.
(b)
increases, decreases respectively
10.
(c)
remains constant
11.
(a)
37 % lead and 63 % tin
12.
(c)
high specific resistance
13.
(c)
\(3\Omega \)
14.
(c)
15.
(c)
carbon
16.
(c)
\({ P }_{ 1 }={ P }_{ 2 }\)
17.
Rt = Ro [1 + α(T2 - T1)
2 = 1[1 + 0.00125(T2 - 293)
I = 5/4 x 10-3 (T2 - 293)
T2 = 1093 K
T2 = 820 oC
18.
Rs = 3 + 2.5 + P = 5.5 + P
V = 9 V, I = 1.0 A
Rs = \(\frac{V}{I}=\frac{9}{1}= 9 \Omega\)
∴ 9 = 5.5 + P
∴ P = 9 - 5.5 = 3.5 Ω
19.
Yellow - 4
Violet - 7
Orange - 103
Silver - Tolerance - 10%
20.
Total length = 2πr = 2π
∴ Resistance of each segment = 2π/2 = π Ω
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