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 மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A
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Published on: 12/10/2020
12th Standard Physics English Medium Free Online Test Creative 1 Mark questions Part Four
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.
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm, The image will from at ______________.
Infinity behind the mirror
Focus
Pole
15 cm
2.
The phenomena by which metals emit electrons under the influence of radiation is called ________
interference
polarization
ionization
photoelectric effect
3.
Which statement is incorrect regarding for p-n junction?
Donor atoms are depleted of their holes in junction
No net charge exists far from junction
Barrier potential VB is generated
Energy VB is to be surrounted before any charge can flow across junction
4.
Natural uranium consists of _____________ % of U235 and __________% of U238
0.72, 99.28
99.28, 0.72
77.28, 72
72, 77.28
5.
If R is Rydberg's constant, the minimum wavelength of hydrogen spectrum is _____________.
1/R
R/4
4/R
R
6.
Electric filament lamp gives rise to _______________spectrum.
line
band
continuous
absorption
7.
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
8.
The reciprocal of conductivity is________
specific conductance
specific resistance
resistance
conductance
9.
If the specific resistance of a potentiometer wire is 10-7 Om and current flowing through it is 0.1 amp, cross-sectional area of wire is 10-6 m2, then potential gradient will be ________________.
10-2 v/m
10-4 v/m
10-6 v/m
10-8v/m
10.
In a hydrogen atom the electron revolves around the proton in an orbit of 0.53 \(\mathring { A } \). The potential produced by the electron on the nuleus is ___________
6.8 V
13.6 V
54.4 V
27.2 V
1.
(d)
15 cm
2.
(d)
photoelectric effect
3.
(d)
Energy VB is to be surrounted before any charge can flow across junction
4.
(a)
0.72, 99.28
5.
For minimum wavelength \(\mathrm{n}=1, \mathrm{~m}=\infty\)
\(\therefore \bar{v}=\frac{1}{\lambda}=R \Rightarrow \lambda=\frac{1}{\mathrm{R}}\)
6.
(c)
continuous
7.
(c)
right hand rule
8.
(b)
specific resistance
9.
(a)
10-2 v/m
10.
(d)
27.2 V
12th Standard Syllabus & Materials
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Tamilnadu Stateboard 12th Standard Subjects
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