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12th Standard Physics English Medium Free Online Test Creative One Mark questions with Answer Key - Part Five

Published on: 12/10/2020

12th Standard Physics English Medium Free Online Test Creative One Mark questions with Answer Key Part Five

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

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Std: 12th Standard - Physics

chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

Which of the following forms a virtual and erect image for all positions of the object?

(a)

Convex lens

(b)

Concave lens

(c)

Convex mirror

(d)

both b & c

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)

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

Bulk particles of nanoparticles are synthesized by ___________

(a)

Top - down approach

(b)

Bottom - up approach

(c)

Top - top approach

(d)

Bottom - real approach

Basic logic gates are _______

(a)

NOT, AND, OR

(b)

NOR, AND, OR

(c)

NAND, AND, OR

(d)

NAND, NOR, NOT

The ability to amplify weak signals is called ________.

(a)

transmission

(b)

sensitivity

(c)

reception

(d)

resolution

The frequency of output signal of LC oscillator circuit is 100 Hz with capacitance value 0.1μF. IF value of capacitance is taken as 0.2 μF, the frequency of output signal ______.

(a)

decreases by \(\frac{1}{\sqrt2}\)

(b)

increases by \(\frac{1}{\sqrt2}\)

(c)

decreases by \(\frac12\)

(d)

increases by \(\frac12\)

Sodium and copper have work functions of 2.3eV and 4.5eV respectively, then the ratio of the wavelengths is nearest to ___________.

(a)

1: 2

(b)

4: 1

(c)

2: 1

(d)

1: 4

Graphite is used as a __________ in nuclear reactors.

(a)

moderator

(b)

coolant

(c)

detector

(d)

fuel

In RLC series AC circuit at resonance __________.

(a)

Resistance is zero

(b)

Net reactance is zero

(c)

impedance is maximum

(d)

voltage leads the current by a phase angle \(\frac{ㅠ}{2}\)

10.

What physical quantities may X and Y represent? [Y represents the first mentioned quantity].

(a)

K.E - velocity of a particle

(b)

pressure - temperature of a given gas (constant volume)

(c)

capacitance - charge to give a constant potential

(d)

potential - capacitance to give a constant charge

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(d)
both b & c

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

(a)
Top - down approach

(a)
NOT, AND, OR

(b)
sensitivity

\(\mathrm{f} \propto \frac{1}{\sqrt{\mathrm{C}}} \Rightarrow \frac{\mathrm{f}_2}{\mathrm{f}_1}=\sqrt{\frac{\mathrm{C}_1}{\mathrm{C}_2}}=\sqrt{\frac{0.1}{0.2}}\)
\(\therefore \mathrm{f}_2=\frac{1}{\sqrt{2}} \mathrm{f}_1\)