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Published on: 12/10/2020
12th Standard Physics English Medium Free Online Test Volume 2 One Mark questions 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.
All of the following statement are correct except _____________.
The magnification produced by a convex mirror is always less than one
A virtual, erect same sized image can be obtained using a plane mirror
A virtual, erect magnified image can be formed using a concave mirror
A real, inverted, same-sized image can be formed using a convex mirror
2.
A point object 0 is placed between two plane mirrors as shown in figure. The distance by mirror M2 from it are _____________.
2 mm, 8 mm, 18 mm
2 mm, 18 mm, 28 mm
2 mm, 18 mm, 22 mm
2 mm, 18 mm, 58 mm
3.
A ray of light is incident normally on a lane mirror. The angle of reflection will be _____________.
0°
90°
will not be reflected
None of these
4.
Two plane mirrors are at 45° to each other. If an object is placed between them then the number of images will be ________________.
5
9
7
8
5.
Muscle wires can contract by _________ when electric current is passed through them.
5%
7%
25%
50%
6.
Energy gap between valence band and conduction band is called as the _____________
forbidden energy gap
conduction band gap
valence band gap
filled band gap
7.
Total angular momentum of a moving electron is an integral multiple of _______
h
λ
\(\frac { h }{ 2\pi } \)
2π
8.
The light photon has _______ nature.
wave
particle
matter
dual
9.
The made of propagation used by short wave broadcast services is _______________.
space wave
skywave
ground wave
both (a) & (c)
10.
According to special theory of relativity the only constant in all frames is _____________.
mass
length
time
velocity of light
11.
To obtain OR gate from NOR gate, you will need __________
one NOR gate
one NOT gate
two NOT gate
one OR gate
12.
As the intensity of incident light increases ______________.
K.E of emitted photo electrons increases
photoelectric current decreases
photoelectric current increases
K.E of emitted photo electrons decreases
13.
The output current versus time curve of a rectifier is shown in the figure. The average value of the output current is ______________.
0
\(\frac{I_0}{2}\)
\(\frac { 2{ I }_{ 0 } }{ \pi } \)
Io
14.
Bohr's radius gives the radius of the _________ orbit.
first
second
third
fourth
15.
Arrange the spectral lines Hα, Hβ, Hγ, Hδ in the increasing order of their wavelength.
Hα, Hβ, H⋎, Hδ
Hδ, H⋎, Hβ, Hα
Hβ, Hα Hδ, H⋎
Hα, Hβ, Hγ, Hδ
16.
Wave number is defined as the number of wave ____________.
produced in one second
in a distance of 1 metre
in a distance of 3 x 108 m
in a distance of λ metre
17.
The materials used in Robotics are _____.
Aluminium and silver
Silver and gold
Copper and gold
Steel and aluminum
18.
The internationally accepted frequency deviation for the purpose of FM broadcasts ____________.
75 kHz
68 kHz
80 kHz
70 kHz
19.
20.
A forward biased diode is treated as ________________.
An open switch with infinite resistance
A closed switch with a voltage drop of 0V
A closed switch in series with a battery voltage of 0.7V
A closed switch in series with a small resistance and a battery
21.
The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li++, He+ and H is _____.
1:2:3
1:4:9
3:2:1
4:9:36
22.
A light source of wavelength 520 nm emits 1.04 x 1015 photons per second while the second source of 460 nm produces 1.38 x 1015 photons per second. Then the ratio of power of second source to that of first source is _____.
1.00
1.02
1.5
0.98
23.
When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is \(\frac{V}{4}\). The threshold wavelength for the metallic surface is _____.
4λ
5λ
\(\frac{5}{2}λ\)
3λ
24.
When light is incident on a soap film of thickness 5 x 10–5 cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be, _____.
1.22
1.33
1.51
1.83
25.
When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as plane sheet of glass. This implies that the liquid must have refractive index, ______.
less than one
less than that of glass
greater than that of glass
equal to that of glass
1.
(d)
A real, inverted, same-sized image can be formed using a convex mirror
2.
(c)
2 mm, 18 mm, 22 mm
3.
(a)
0°
4.
(c)
7
5.
(a)
5%
6.
(a)
forbidden energy gap
7.
(c)
\(\frac { h }{ 2\pi } \)
8.
(b)
particle
9.
(b)
skywave
10.
(d)
velocity of light
11.
(b)
one NOT gate
12.
(c)
photoelectric current increases
13.
(c)
\(\frac { 2{ I }_{ 0 } }{ \pi } \)
14.
(a)
first
15.
(b)
Hδ, H⋎, Hβ, Hα
16.
(b)
in a distance of 1 metre
17.
(d)
Steel and aluminum
18.
(a)
75 kHz
19.
(d)
20.
(d)
A closed switch in series with a small resistance and a battery
21.
\(\frac{1}{\lambda}=\mathrm{RZ}^2\left[\frac{1}{\mathrm{n}_1^2}-\frac{1}{\mathrm{n}_2^2}\right] \)
\(\frac{1}{\lambda}=\mathrm{RZ} ^2\left[\frac{1}{1}-\frac{1}{4}\right]=\frac{3}{4} \mathrm{RZ}^2 \)
\(\lambda \propto \frac{1}{Z^2} \)
\(\lambda_{\mathrm{Li}}: \lambda_{\mathrm{H} c}: \lambda_{\mathrm{H}}=\frac{1}{9}: \frac{1}{4}: \frac{1}{1}=4: 9: 36\)
22.
\(P =\frac{E}{t}=\frac{n h v}{t}=\frac{n h c}{\lambda t} \Rightarrow P \propto n / t \)
\(\frac{P_1}{P_2} =\frac{1.38 \times 10^{15}}{460} \times \frac{520}{1.04 \times 10^{15}}=1.5\)
23.
\(\frac{\mathrm{hc}}{\lambda}=\phi+\mathrm{eV} \) .....(1)
\(\frac{\mathrm{hc}}{2 \lambda}=\phi+\frac{\mathrm{eV}}{4}\) .....(2)
multiply (2) eqn by 4
\(\frac{2 h c}{\lambda}=4 \phi+\mathrm{eV}\) .....(3)
subtract eqn (1) from (3), we get
\(\frac{ h c}{\lambda}=3 \phi \Rightarrow \phi = \frac{ h c}{3\lambda}\)
\(\frac{ h c}{\lambda_o}=\frac{ h c}{3\lambda}\)
⋋o = 3⋋
24.
2n t cos r = (2m + 1) \(\frac{\lambda}{2}\)
For maximum
m = 2 (For visible region), n - refractive index.
cos r = cos 0 = 1
t = 5 x 10-5 x 10-2 = 5 x 10-7 m
\(n=\frac{(2m+1)\frac{\lambda}{2}}{2t}=\frac{5\lambda}{2 \times 2 \times t}\)
\(=\frac{5 \times5320\times10^{-10}}{4 \times 5 \times 10^{-7}}\)
\(=\frac{5 \times5320\times10^{-10}}{20}=1330 \times 10^3\)
n = 1.330
25.
\(\frac{I}{f}=\left(\frac{\mu_{\mathrm{L}}}{\mu_L}-1\right)\left(\frac{1}{R_1}-\frac{1}{R_2}\right)\)
When the biconvex lens of glass dipped in liquid, it acts as a plane sheet of glass.
\(\therefore \mathrm{f}=\infty, \frac{1}{\mathrm{f}}=0 \quad \frac{\mu_g}{\mu_{\mathrm{L}}}-1=0 ; \frac{\mu_{\mathrm{s}}}{\mu_{\mathrm{L}}}=1, \mu_{\mathrm{s}}=\mu_{\mathrm{L}}\)
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Tamilnadu Stateboard 12th Standard Subjects
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