12th Standard English Medium Physics Reduced syllabus Creative one mark Question with Answerkey - 2021(Public Exam )

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Questions:

Multiple Choice Question

50 x 1 = 50

A vehicle has a driving mirror of a focal length of 30 cm. Another vehicle of dimension 2 x 4 x 1.75 m³is 9 m away from the mirror of the first vehicle. The position of the second vehicle as seen in the mirror of the first vehicle is ___________.

(a)

30 cm

(b)

60 cm

(c)

90 cm

(d)

9 cm

Given a point source of light, which of the following can produce a parallel beam of light ______________.

(a)

Convex mirror

(b)

Concave mirror

(c)

Concave lens

(d)

Two plane mirrors inclined at an angle of 90°

An object is placed at 20 cm from a convex mirror of focal length 10 cm. The image formed by the mirror is _____________.

(a)

Real and 20 cm from the mirror

(b)

Virtual and at 20 cm from the mirror

(c)

Virtual and 20/3 cm from the mirror

(d)

Real and 20/3 cm from the mirror

The de Broglie wavelength of electron accelerated with a potential V is ________

(a)

\(\lambda =\frac { h }{ \sqrt { Vem } } \)

(b)

\(\lambda =\frac { h }{ \sqrt { 2Vem } } \)

(c)

\(\lambda =\frac { h }{ m\sqrt { 2Vem } } \)

(d)

\(\lambda =\frac { h }{ m\sqrt { \frac { Ve }{ m } } } \)

Find the accelerating potential of an electron whose de Broglie wave length is 3 Å

(a)

150.5 V

(b)

6.63 V

(c)

37.53 V

(d)

16.73 V

_______ is synthesized top down approach

(a)

Ball milling

(b)

Plasma etching

(c)

lithography

(d)

Ball milling and lithography

If v = c, the mass of the moving body, of rest, mass 'm_o' is _________

(a)

zero

(b)

infinity

(c)

m_o

(d)

\(\frac { m }{ { m }_{ o } } \)

The speaker converts ________ energy into ______ energy.

(a)

electrical, sound

(b)

sound, electrical

(c)

light, sound

(d)

sound, mechanica

Vacant energy levels are called _________

(a)

valence level

(b)

core level

(c)

conduction levels

(d)

compound level

10.

The third electromagnet put in the path of an electron beam in an electron microscope is called _________

(a)

projector magnetic lens

(b)

accelerator

(c)

velocity selector

(d)

oscilloscope

11.

The ability to select a particular wanted signal only and rejecting the unwanted signals is called __________.

(a)

sensitivity

(b)

buffer action

(c)

reception

(d)

selectivity

12.

In a transmitter, the _______ isolates the RF amplifier from the oscillator.

(a)

amplifier

(b)

oscillator

(c)

buffer

(d)

transistor

13.

The total variation in frequency of a FM transmitter is called _______

(a)

signal swing

(b)

carrier swing

(c)

shift

(d)

difference

14.

If the distance between the conduction band and valence band is leV, then this combination is _______________.

(a)

semiconductor

(b)

metal

(c)

insulator

(d)

conductor

15.

Reverse bias applied to a junction diode is ______________.

(a)

increases the potential barrier

(b)

increases the majority carrier current

(c)

lowers the potential barrier

(d)

increases the minority carrier current

16.

The radiation of electrical energy is practicable only above _________

(a)

20 kHz

(b)

200 MHz

(c)

200 kHz

(d)

20 Hz

17.

The process of superimposing the audio signal over the carrier wave is called ________

(a)

superposition

(b)

modulation

(c)

demodulation

(d)

extraction

18.

Skip distance the shortest distance between ______________.

(a)

the point of transmission and the point of reception

(b)

the uplink and the downlink station

(c)

the transmitter and the target

(d)

the receiver and the target

19.

Doping of a semiconductor generally changes resistivity as follows ________________.

(a)

increases

(b)

decreases

(c)

does not alter

(d)

may increase

20.

In space communication, the sound waves can be sent from one place to another ________.

(a)

through space

(b)

through wires

(c)

by super imposing it on undamped EM waves

(d)

by super imposing it on damped EM waves

21.

When NPN transistor is used as an amplifier then _____________

(a)

electron moves from base to collector

(b)

hole travels from emitter to base

(c)

hole goes to emitter from base

(d)

electron goes to base from collector

22.

Ground wave have wavelength ________________.

(a)

less than that of sky waves

(b)

greater than that of sky wave

(c)

less than that of space waves

(d)

equal to that of space waves

23.

The process of increasing the strength of a signal using an electric circuit is called ________________.

(a)

amplification

(b)

modulation

(c)

demodulation

(d)

transmission

24.

If the radius of third Bohr orbit in a hydrogen atom is r, then the de-Broglie wavelength of an electron in this orbit is ______________.

(a)

\(\frac { r }{ 3 } \)

(b)

(c)

\(\frac { 2\pi r }{ 3 } \)

(d)

3(2πr)

25.

For Boolean identities match the pair
(i) \(\overset { = }{ A } \) (P) Ā + \(\bar { B } \)
(ii) \(\overline { A+B } \) (Q) A.B
(iii) \(\overline { A.B } \) (R) \(\bar { A } .\bar { B } \)
(iv) A.(Ā + B) (S) A

(a)

1 - (S), 2 (P), 3 - (Q), 4 - (R)

(b)

1 - (S), 2 (R), 3 - (Q), 4 - (P)

(c)

1 - (S), 2 (Q), 3 - (P), 4 - (R)

(d)

1- (S), 2 (R), 3 - (P), 4 - (Q)

26.

Which of the following figure represents an ideal diode characteristics?

(a)

(b)

(c)

(d)

27.

In an P.N.P transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector _____________.

(a)

I_E= 9mA

(b)

I_E= 10mA

(c)

I_B= 1mA

(d)

I_B= - 1mA

28.

In an N-P-N transistor circuit, the emitter, collector, and base current are respectively I_E, I_C, and l_B. The relation between them is _____________.

(a)

I_CEB

(b)

I_BCE

(c)

I_B> I_C> I_E

(d)

I_B> I_C> I_E

29.

Which statement is incorrect regarding for p-n junction?

(a)

Donor atoms are depleted of their holes in junction

(b)

No net charge exists far from junction

(c)

Barrier potential V_B is generated

(d)

Energy V_B is to be surrounted before any charge can flow across junction

30.

To convert fertile material into fissile material, we make use of _______ reactors.

(a)

research

(b)

production

(c)

power

(d)

generator

31.

Roentgen (R) is the unit to measure _________

(a)

X-ray strength

(b)

number of holes produced by X-rays

(c)

radiation exposure

(d)

number of cancer cells

32.

In the nuclear reaction ₄Be⁹+ X ➝₆C¹²+ ₀n¹ X stands for ______________.

(a)

proton

(b)

α particle

(c)

electron

(d)

deutron

33.

Gamma rays are extensively used to destroy __________ affected cells

(a)

Sickle-cell anaemia

(b)

Cancer

(c)

HIV

(d)

Polio virus

34.

In gamma ray emission from nucli _____________.

(a)

both the neutron number and the proton number change

(b)

there is no change in neutron number and the proton number change

(c)

only the neutron number changes

(d)

only the proton number changes

35.

Which particle cannot be emitted by radioactive element during their decay?

(a)

neutrino

(b)

helium nuclei

(c)

photons

(d)

electrons

36.

The process of giving extra energy to an electron in an orbit is called ________ of the atom

(a)

grounding

(b)

excitation

(c)

sinking

(d)

induction

37.

Energy of an atom at its ground state is ___________

(a)

zero

(b)

maximum

(c)

minimum

(d)

10 eV

38.

Paschen series of hydrogen atom comes under ___________ region.

(a)

(b)

(c)

X-ray

(d)

Gamma ray

39.

If in a hydrogen spectrum, n₁ = 2 and n₂ = 3, 4, 5... then the series is called ___________ series.

(a)

Lyman

(b)

Balmer

(c)

Brackett

(d)

Pfund

40.

When the electron jumps from any of the outer orbits to the first orbit, spectral lines are emitted in the ________ region.

(a)

visible

(b)

(c)

X-ray

(d)

41.

The value of Bohr radius is _______ m.

(a)

53 x 10^-15

(b)

0.53 x 10^-12

(c)

53 x 10^-12

(d)

53 x 10^-15

42.

The orbits in which electrons supposed to be revolving according to Rutherford are ___________

(a)

square-shaped

(b)

circular

(c)

rectangular

(d)

linear

43.

The charge of an alpha-particle is _______________

(a)

same as that of a proton

(b)

twice as that of an electron

(c)

thrice as that of an proton

(d)

twice as that of a neutron

44.

The velocity of cathode rays is upto ________ the velocity of light.

(a)

0.10

(b)

0.001

(c)

10.5

(d)

0.01

45.

The ionisation potential of hydrogen atom is ______________.

(a)

13.6eV

(b)

-13.6eV

(c)

13.6 V

(d)

-13.6 V

46.

When hydrogen atom is in its first excited level, its radius is __________ of the Bohr radius.

(a)

twice

(b)

same

(c)

half

(d)

four times

47.

The torque experienced by a rectangular current loop placed perpendicular to a uniform magnetic field is

(a)

maximum

(b)

minimum

(c)

finite minimum

(d)

zero

48.

The average power consumed per cycle is ______________.

(a)

Zero

(b)

2000 W

(c)

1000 W

(d)

500 W

49.

The efficiency of an ideal transformer is ____________.

(a)

(b)

(c)

infinite

(d)

none

50.

Lenz's law is in accordance with the law of ________________.

(a)

conservation of charges

(b)

conservation of flux

(c)

conservation of momentum

(d)

conservation of energy

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(a)
30 cm

(b)
Concave mirror

(b)
\(\lambda =\frac { h }{ \sqrt { 2Vem } } \)

(d)
16.73 V

(d)
Ball milling and lithography

(b)
infinity

(a)
electrical, sound

10.

(a)
projector magnetic lens

11.

(d)
selectivity

12.

13.

(b)
carrier swing

14.

(a)
semiconductor

15.

(a)
increases the potential barrier

16.

(a)
20 kHz

17.

(b)
modulation

18.

(a)
the point of transmission and the point of reception

19.

(b)
decreases

20.

21.

22.

(b)
greater than that of sky wave

23.

(a)
amplification

24.

25.

(d)
1- (S), 2 (R), 3 - (P), 4 - (Q)

26.

27.

28.

(b)
I_BCE

29.

(d)
Energy V_B is to be surrounted before any charge can flow across junction

30.

(b)
production

31.

32.

(b)
α particle

33.

(b)
Cancer

34.

(a)
both the neutron number and the proton number change

35.

36.

(b)
excitation

37.

(b)
maximum

38.

(a)
IR

39.

(b)
Balmer

40.

(d)
UV

41.

42.

(b)
circular

43.

(b)
twice as that of an electron

44.

(a)
0.10

45.

46.

(d)
four times

47.

(d)
zero

48.

49.

(b)
1

50.

(d)
conservation of energy

12th Standard English Medium Physics Reduced syllabus Creative one mark Question with Answerkey - 2021(Public Exam )

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Std: 12th Standard - Physics

chapter: - Model Question paper

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Questions:

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Answers Key:

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Physics Tamilnadu Stateboard Class 12 MCQ Practice Test

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