12th Standard Syllabus & Materials
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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
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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 மின் - வணிகம் 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: 12/10/2020
12th Standard Physics English Medium Free Online Test 1 mark questions 2020 Part Nine
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.
In actual practice, the range of uplink frequencies used is _________ GHz.
5.725 - 7.075
3.4 - 4.8
6 - 10
9 - 10
2.
Electrons when accelerated in a cyclotron acquires ________
zero mass
higher mass
zero velocity
uniform acceleration
3.
The transmitter in a RADAR is a high power ________.
cyclotron oscillator
magnetron oscillator
Hartley oscillator
simple harmonic oscillator
4.
In a video signal for transmission of picture what value of bandwidth is used in communication system?
2.4 MHz
4:2 MHz
24MHz
42 MHz
5.
Sodium and copper have work functions of 2.3eV and 4.5eV respectively, then the ratio of the wavelengths is nearest to ___________.
1: 2
4: 1
2: 1
1: 4
6.
The explosion of hydrogen bomb is based on the principle of _________________.
uncontrolled fission reaction
nuclear fusion reaction
controlled fission
photo electric effect
7.
The principle based on which a solar cell operates is______.
Diffusion
Recombination
Photovoltaic action
Carrier flow
8.
9.
The wavelength λe of an electron and λp of a photon of same energy E are related by _____.
λp ∝ λe
\({ \lambda }_{ p }∝ \sqrt { { \lambda }_{ e } } \)
\({ \lambda }_{ p }∝ \frac { 1 }{ \sqrt { { \lambda }_{ e } } } \)
\({ \lambda }_{ p }∝ { \lambda }_{ e }^{ 2 }\)
10.
An object is placed in front of a convex mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.
2f and c
c and \(\infty\)
f and O
None of these
11.
Gamma rays are used in the treatment of __________
cancer
Polio
AIDS
Tuberculosis
12.
The magnetic declination for chennai is _______
-1° 5'
1°8'
-1°8'
1°5'
13.
The heat developed in half a minute in a resistor of resistance 5Ω is 15,000 joules. The current through the resistor is _______________.
5 ampere
100 ampere
40 ampere
10 ampere
14.
The direction of the magnetic force on a positive charge moving in a magnetic field is given by ________________.
thumb rule
left hand rule
right hand rule
cork screw rule
15.
In an a.c. dynamo, the induced current is _________ in nature.
alternating
increasing
decreasing
constant
16.
Copper Wire metals and burns out when the current increases above______
5 A
10 A
25 A
25 A
17.
Near a charged object A another earthed object B is placed. Charges are induced on B. If B is removed. After that the charge on A ________.
remains the same
decreases
increases
becomes zero
18.
A square aluminum rod is 1 m long and 5 mm on edge. What must be the radius of another aluminum rod whose length is 1 m and which has the same resistance as that of square Aluminum rod?
1.4 mm
2.8 mm
4.2 mm
5.6 mm
19.
When a point charge of 6mC is moved between two points in an electric field, the work done is 1.8 x 10-5 J. The potential difference between the two points is
1.08 V
1.08 μV
3 V
30 V
20.
Van de Graaff generator produces an electrostatic potential difference of_______ volts.
108
109
107
1010
21.
Two identical coils, each with N turns and radius R are placed coaxially at a distance R as shown in the figure. If I is the current passing through the loops in the same direction, then the magnetic field at a point P at a distance of R/2 from the centre of each coil is _____.
\(\frac { 8N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)
\(\frac { 8N{ \mu }_{ ° }I }{ { 5 }^{ 3/2 }R } \)
\(\frac { 8N{ \mu }_{ ° }I }{ { 5 }R } \)
\(\frac { 4N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)
22.
A circular coil with a cross-sectional area of 4 cm2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm2. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
7.54 μH
8.54 μH
9.54 μH
10.54 μH
23.
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is _____.
10 V
-20 V
+20 V
-10 V
24.
In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW are connected. The voltage of electric mains is 220 V. The maximum capacity of the main fuse of the building will be ______.
14 A
8 A
10 A
12 A
1.
(a)
5.725 - 7.075
2.
(b)
higher mass
3.
(b)
magnetron oscillator
4.
(b)
4:2 MHz
5.
(c)
2: 1
6.
(b)
nuclear fusion reaction
7.
(c)
Photovoltaic action
8.
(b)
9.
\(\mathrm{E}_{\mathrm{p}} =\frac{\mathrm{hc}}{\lambda_{\mathrm{p}}} \)
\(\mathrm{E}_{\mathrm{e}} =\frac{\mathrm{h}^2}{2 \mathrm{~m} \lambda_{\mathrm{e}}^2} \)
\(\frac{\mathrm{hc}}{\lambda_{\mathrm{p}}} =\frac{\mathrm{h}^2}{2 \mathrm{~m} \lambda_{\mathrm{e}}^2} \)
\(\lambda_{\mathrm{p}} \propto \lambda_{\mathrm{e}}^{{ }^2}\)
10.
Convex Mirror is diverging in nature and for all positions of objects, convex mirror forms virtual and erect image.
11.
(a)
cancer
12.
(c)
-1°8'
13.
(d)
10 ampere
14.
(c)
right hand rule
15.
(a)
alternating
16.
(d)
25 A
17.
(a)
remains the same
18.
(b)
2.8 mm
19.
(c)
3 V
20.
(c)
107
21.
\(B=\frac { { \mu }_{ ° }NI a^2}{ { 2(a^2+x^2)}^{ \frac { 3 }{ 2 } } } \)
put a = R
and x = R/2, we get,
\(B=\frac { 8N{ \mu }_{ ° }I }{ { 5 }^{ 3 / 2 }R } \)
22.
\(A_1 =4 \times 10^{-4} \mathrm{~m}^2 \)
\(N_1 =10 \text { turns } \)
\(A_2 =4 \times 10^{-4} \mathrm{~m}^2 \)
\(N_2 =15 \times 10^{-}=1500 \mathrm{turn} / \mathrm{m} \)
\(\phi =B_2 A_2=\left(\mu_0 \mathrm{n}_2 I_2\right) \mathrm{A}_1 \)
\(Where, \mathrm{n}_2=\frac{\mathrm{N}_2}{l}=1500 \mathrm{turn} / \mathrm{m}\)
The mutual Inductance is,
\(M =\frac{N_1 o_{12}}{I_2}=\mu_0 n_2 N_1 A_1 \)
\(=4 \pi \times 10^{-7} \times 1500 \times 10 \times 4 \times 10^{-4} \)
\(=7.54 \times 10^{-6} \mathrm{H}=7.54 \mu \mathrm{H}\)
23.
\(\vec {E}\) = 10x\(\hat{i},\) when x = 2 m
\(\vec {E}\) = 10 x 2 x \(\hat{i}\) = 20\(\hat{i}\)
Since, \(E=\frac{-dV}{dx}\therefore V=+20 V\)
24.
Total power = 15 x 40 + 5 x 100 + 5 x 80 + 1000
= 600 + 500 + 400 + 1000
= 2500 W
P = VI, V = 220 V
\(I=\frac{P}{V}=\frac{2500}{220}=11.363 \ A\)
≃ 12 A
12th Standard Syllabus & Materials
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