12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
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 Book Back one Mark questions Part Two
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 technology used for stopping the brain from processing pain is _____.
Precision medicine
Wireless brain sensor
Virtual reality
Radiology
2.
The frequency range of 3 MHz to 30 MHz is used for ______.
Ground wave propagation
Space wave propagation
Sky wave propagation
Satellite communication
3.
The half-life period of a radioactive element A is same as the mean life time of another radioactive element B. Initially both have the same number of atoms. Then _____.
A and B have the same decay rate initially
A and B decay at the same rate always
B will decay at faster rate than A
A will decay at faster rate than B
4.
The work functions for metals A, B and C are 1.92 eV, 2.0 eV and 5.0 eV respectively. The metal/metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are _____.
A only
both A and B
all these metals
none
5.
Light transmitted by Nicol prism is, _____.
partially polarised
unpolarised
plane polarised
elliptically polarised
6.
A flat dielectric disc of radius R carries an excess charge on its surface. The surface charge density is σ. The disc rotates about an axis perpendicular to its plane passing through the center with angular velocity ω. Find the magnitude of the torque on the disc if it is placed in a uniform magnetic field whose strength is B which is directed perpendicular to the axis of rotation.
\(\frac { 1 }{ 4 } \sigma \omega \pi BR\)
\(\frac { 1 }{ 2 } \sigma \omega \pi B{ R }^{ 2 }\)
\(\frac { 1 }{ 4 } \sigma \omega \pi B{ R }^{ 3 }\)
\(\frac { 1 }{ 4 } \sigma \omega \pi B{ R }^{ 4 }\)
7.
In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is
\(\frac{Q}{2}\)
\(\frac{Q}{\sqrt3}\)
\(\frac{Q}{\sqrt2}\)
Q
8.
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
9.
Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is
1μF
2μF
3μF
\(\frac{1}{4}\)μF
10.
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ______.
each of them increases
each of them decreases
copper increases and germanium decreases
copper decreases and germanium increases
1.
Medical virtual reality is effectively used to stop the brain from processing pain and cure soreness.
2.
Ground wave propagation: frequency less than 2 MHz
Sky wave propagation: 3 to 30 MHz
Space wave propagation: Above 30 MHz to 400 GHz
Satellite communication: uplink communication 6 GHz band downlink communication 4 GHz band
3.
TA1/2 = ፒB
\(\frac{0.6931}{\lambda_{\mathrm{A}}}=\frac{1}{\lambda_{\mathrm{B}}} \)
\(\lambda_{\mathrm{B}}=\frac{\lambda_{\mathrm{A}}}{0.6931}=1.44 \lambda_{\mathrm{A}}\)
Hence, B will decay at faster rate than A
4.
\(E=\frac{12400 \stackrel{o}A}{4100 \stackrel{o}A}=3.02 eV\)
5.
(c)
plane polarised
6.
(d)
\(\frac { 1 }{ 4 } \sigma \omega \pi B{ R }^{ 4 }\)
7.
\(Q_{midpoint}=\frac{Q}{\sqrt{1^2+1^2}}=\frac{Q}{\sqrt2}\)
8.
(d)
in vacuum, it travels with different speeds which depend on their frequency
9.
\(\frac{1}{C_s}=\frac{1}{2}+\frac{1}{2}=1 \ μF\)
Cp = 1 + 1 = 2 μF
10.
Resistivity ∝ temperature for conductor. so, copper → decreases
Resistivity ∝\(\frac{1}{\text {temperature for semiconductor}}\)
so, germanium → increases.
12th Standard Syllabus & Materials
12th Standard
TN 12th Computer Applications களப்பெயர் முறைமை (DNS) Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications வலையமைப்பு எடுத்துக்காட்டுகள் மற்றும் நெறிமுறைகள் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications கணினி வலையமைப்பு ஓர் அறிமுகம் Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th Computer Applications PHP-உடன் MySQL-ஐ இணைத்தல் Sample Question Papers Study Material - QB365 Set A
Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
Tamilnadu Stateboard Standards
