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Published on: 12/10/2020
12th Standard Physics English Medium Free Online Test Volume 1 One Mark questions with Answer Key 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.
We can make long distance photographs using _________.
radio waves
visible light
X-rays
IR rays
2.
Which one of the following is not an electromagnetic waves?
Gamma rays
X-rays
Beta rays
Microwaves
3.
In vacuum speed of light depends upon ______________.
colour
wavelength
frequency
none of the above
4.
No current flows between two charged particles when connected if they have same ______
capcity
potential
charge
none of these
5.
Magnetic Lorentz force makes a moving charged particle to follow a _______
linear path
parabolic path
elliptical path
circular path
6.
To convert a galvanometer into an ammeter we connect which one of the following to the galvanometer?
a low resistance in series
a high resistance in series
a low resistance in parallel
a high resistance in parallel
7.
The reactance of a capacitor is __________.
Xc = Cω
Xc = \(\frac{1}{Cω}\)
Xc = \(\frac{C}{ω}\)
Xc = \(\frac{ω}{C}\)
8.
In a transformer, eddy current loss is minimized by using ____________.
laminated core made of muemetal
laminated core made of stelloy
shell type core
thick copper wire
9.
An electron of mass 0.90 x 10-30kg under the action of a magnetic field moves in a circle of 2cm radius at a speed of 3 x 106 m/s if a proton of mass 1.8 x 10-27 kg was to move in a circle of the same radius in the same magnetic field, then its speed will be _______________.
3.0 x 106 m/s
1.5 x 103 m/s
6.0 x 104 m/s
cannot be estimated from the same data
10.
The self-inductance of a straight conductor is ________________.
zero
infinity
very large
very small
11.
A resistance of a metal wire of length AB is 2\(\Omega \). Another wire of length PQ of the same metal with twice the diameter of the wire AB is found to have the same resistance of 2\(\Omega \). What is the length of PQ?
4 AB
2 AB
1AB
6 AB
12.
Two point charges +q and -q are placed at points A and B respectively separated by a small distance. The electric field intensity at the midpoint O of AB :
is zero
acts along AB
acts along BA
acts perpendicular to AB
13.
The thermistors are usually made of ________________.
metals with low temperature coefficient of resistivity
metals with high temperature coefficient of resistivity
metal oxides with high temperature coefficient of resistivity
semi conducting materials with low temperature coefficient of resistivity
14.
A potential difference is applied an the ends of a metallic wire. If the potential difference is doubled, the drift velocity ________________.
will be doubled
will be halved
will be quadrupled
will remain unchanged
15.
A charge q is placed at the centre of a cubical box of side with top open. The flux of electric field through the surface of the cubical box is
Zero
\(\frac { q }{ { \varepsilon }_{ 0 } } \)
\(\frac { q }{ 6{ \varepsilon }_{ 0 } } \)
\(\\ \frac { 5q }{ 6{ \varepsilon }_{ 0 } } \)
16.
A non-conducting material which has no free electrons is called
capacitor
Dielectric
conductor
Inductor
17.
What will happen if two conducting spheres are separately charged and then brought in contact?
Total charge on the two spheres is conserved
The total energy is conserved
Both charge and energy are conserved
The final potential is the mean of the original potentials.
18.
The relative permittivity of water is _______.
εr = 70
εr = 75
εr = 80
εr = 85
19.
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 _____.
\(\frac { 8N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)
\(\frac { 8N{ \mu }_{ ° }I }{ { 5 }^{ 3/2 }R } \)
\(\frac { 8N{ \mu }_{ ° }I }{ { 5 }R } \)
\(\frac { 4N{ \mu }_{ ° }I }{ \sqrt { 5 } R } \)
20.
An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?
The current will reverse its direction as the electron goes past the coil
No current will be induced
abcd
adcb
21.
Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is _____.
1 m
10 m
100 m
1000 m
22.
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23.
The total electric flux for the following closed surface which is kept inside water
\(\frac { 80q }{ { \varepsilon }_{ 0 } } \)
\(\frac { q }{ { 40\varepsilon }_{ 0 } } \)
\(\frac { q }{ { 80\varepsilon }_{ 0 } } \)
\(\frac { q }{ { 160\varepsilon }_{ 0 } } \)
24.
What is the current drawn out from the battery?
1 A
2 A
3 A
4 A
25.
A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.
400 W
2 W
480 W
240 W
1.
(d)
IR rays
2.
(c)
Beta rays
3.
(d)
none of the above
4.
(b)
potential
5.
(d)
circular path
6.
(c)
a low resistance in parallel
7.
(b)
Xc = \(\frac{1}{Cω}\)
8.
(b)
laminated core made of stelloy
9.
(b)
1.5 x 103 m/s
10.
(a)
zero
11.
(a)
4 AB
12.
(b)
acts along AB
13.
(c)
metal oxides with high temperature coefficient of resistivity
14.
(a)
will be doubled
15.
(d)
\(\\ \frac { 5q }{ 6{ \varepsilon }_{ 0 } } \)
16.
(b)
Dielectric
17.
(a)
Total charge on the two spheres is conserved
18.
(c)
εr = 80
19.
\(B=\frac { { \mu }_{ ° }NI a^2}{ { 2(a^2+x^2)}^{ \frac { 3 }{ 2 } } } \)
put a = R
and x = R/2, we get,
\(B=\frac { 8N{ \mu }_{ ° }I }{ { 5 }^{ 3 / 2 }R } \)
20.
The direction of conventional current is always opposite to the direction of flow of electrons.
21.
ג = \(\frac{c}{f}=\frac{3 \times10^8}{300 \times 10^6}=1 m\)
22.
(b)
23.
\(Φ=\frac { q_{net} }{ { \varepsilon }_{ 0 } } \)
qnet = - q + q + 2q = 2q
Relative permittivity of water = 80
\(\therefore Φ=\frac { q }{{ \varepsilon }_{ r } { \varepsilon }_{ 0 } } \)
\(=\frac{2q}{{ 80 \times \varepsilon }_{ 0 }}=\frac{q}{{ 40 \varepsilon }_{ 0 }}\)
24.
\(\frac{1}{R_p}=\frac{1}{15}+\frac{1}{15}+\frac{1}{15}.\)
\(=\frac{1+1+1}{15}=\frac{3}{15}=\frac{1}{5}\)
∴ Rp = 5 Ω
\(\therefore I=\frac{V}{R_p}=\frac{5}{5}=1A\)
25.
\(P=\frac{V^2}{R}=\frac{240 \times 240}{120}=480 \ W\)
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