12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 25/08/2020
12th Standard Physics English Medium Model 1 Mark Book Back Questions (New Syllabus) 2020
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.
The alloys used for muscle wires in Robots are _____.
Shape memory alloys
Gold copper alloys
Gold silver alloys
Two dimensional alloys
2.
Which one of the following is the natural nanomaterial.
Peacock feather
Peacock beak
Grain of sand
Skin of the Whale
3.
The variation of frequency of carrier wave with respect to the amplitude of the modulating signal is called ______.
Amplitude modulation
Frequency modulation
Phase modulation
Pulse width modulation
4.
If the input to the NOT gate is A = 1011, its output is ______.
0100
1000
1100
0011
5.
The principle based on which a solar cell operates is______.
Diffusion
Recombination
Photovoltaic action
Carrier flow
6.
If a positive half-wave rectified voltage is fed to a load resistor, for which part of a cycle there will be current flow through the load?
00–900
900–1800
00–1800
00–3600
7.
The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as _____.
A2/3
A4/3
A1/3
A5/3
8.
9.
The ratio between the radius of first three orbits of hydrogen atom is _____.
1:2:3
2:4:6
1:4:9
1:3:5
10.
Two radiations with photon energies 0.9 eV and 3.3 eV respectively are falling on a metallic surface successively. If the work function of the metal is 0.6 eV, then the ratio of maximum speeds of emitted electrons in the two cases will be _____.
1:4
1:3
1:1
1:9
11.
In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would _____.
increase by 2 times
decrease by 2 times
decrease by 4 times
increase by 4 times
12.
A ray of light strikes a glass plate at an angle 60o. If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is, _____.
\(\sqrt3\)
\(\frac{3}{2}\)
\(\sqrt{\frac{3}{2}}\)
2
13.
An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is ______.
8 cm
10 cm
12 cm
16 cm
14.
A simple pendulum with charged bob is oscillating with time period T and lets θ be the angular displacement. If the uniform magnetic field switched ON in a direction perpendicular to the plane of oscillation then ___________.
time period will decrease but θ will remain constant
time period remain constant but θ will decrease
both T and θ will remain the same
both T and θ will decrease
15.
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
Circle
Semi-circle
Square
All of them
16.
17.
Which of the following is NOT true for electromagnetic waves?
it transport energy
it transport momentum
it transport angular momentum
in vacuum, it travels with different speeds which depend on their frequency
18.
Which of the following electromagnetic radiations is used for viewing objects through fog
microwave
gamma rays
X- rays
infrared
19.
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
Capacitance
Charge
Voltage
Energy density
20.
The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is ______.
0.2 Ω
0.5 Ω
0.8 Ω
1.0 Ω
1.
They are thin strands of wire made of shape memory alloys. They can contract by 5% when electric current is passed through them.
2.
Wings of a morpho butterfly, peacock feathers, lotus leaf surface and sources of parrot fish's bite are some of the natural nano particles.
3.
(b)
Frequency modulation
4.
\(y=\overline{A}=\overline{1011}=0100\)
The Boolean expression for NOT gate, \(y=\bar{A}\)
5.
(c)
Photovoltaic action
6.
(c)
00–1800
7.
r ∝ A1/3
Surface Area = 4πr2
Hence, Surface Area ∝ A2/3
8.
(b)
9.
rn ∞ n2
r1: r2: r3 = 1: 4: 9
10.
K.E= hv - Φ
K.E1 = 0.9 - 0.6 = 0.3 eV
K.E2 = 3.3 - 0.6 = 2.7 ev
K.E ∝ v2
\(\frac{0.3}{2.7}=\frac{v^2_1}{v^2_2} \)
\(\frac{v^1}{v^2} =\frac{1}{3}\)
11.
\(\lambda\propto \frac{1}{\sqrt{V}}\)
\(\frac{\lambda_1}{\lambda_2}=\frac{\sqrt{224\times10^3}}{\sqrt{14\times 10^3}}\)
\(=\sqrt{16}=4\)
\(\lambda_{\mathrm{2}}= \frac{\lambda_1}{4}\)
12.
n = tan ip = tan 60o = \(\sqrt{3}\)
13.
Apparent depth = 3 + 5 = 8 cm
Real depth = thickness of the slab = t
n = 1.5
\(n=\frac{Real \ depth}{Apparent \ depth}\)
\(\therefore 1.5=\frac{t}{8}\)
t = 1.5 x 8
t = 12 cm
14.
(c)
both T and θ will remain the same
15.
(a)
Circle
16.
(a)
17.
(d)
in vacuum, it travels with different speeds which depend on their frequency
18.
(d)
infrared
19.
Energy density uE \(=\frac{U}{volume}\)
If A' = 2A d ' = 2d
Then V ' = 2A x 2d = 4Ad = 4V
Then volume would be increased. So, energy density will change.
20.
I = 0.2 A, R = 10 Ω, E = 2.1 V
\(I=\frac{ɛ}{R+r}\)
\(0.2=\frac{2.1}{10+r}\)
0.2 x (10 + r) = 2.1
2 + 0.2 r = 2.1
0.2 r = 2.1 - 2 = 0.1
Internal resistance, \(r=\frac{0.1}{0.2}=\frac{1}{2}\)
r = 0.5 Ω
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