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

12th Standard

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Physics

Time : 00:10:00 Hrs
Total Marks : 10
10 x 1 = 10
1. 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

2. 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 $\frac{ㅠ}{2}$

3. Which of the following forms a virtual and erect image for all position of the object.

(a)

Convex lens

(b)

Concave lens

(c)

Convex mirror

(d)

both b & c

4. 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

5. 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)

$\lambda =\frac { h }{ m\sqrt { \frac { Ve }{ m } } }$

6. Graphite is used as a __________ in nuclear reactors.

(a)

moderator

(b)

coolant

(c)

detector

(d)

fuel

7. 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 $\frac12$

8. Basic logic gates are _______

(a)

NOT, AND, OR

(b)

NOR, AND, OR

(c)

NAND, AND, OR

(d)

NAND, NOR, NOT

9. The ability to amplify weak signals is called ________.

(a)

transmission

(b)

sensitivity

(c)

reception

(d)

resolution

10. Bulk particles of nanoparticles are synthesized by ___________

(a)

Top - down approach

(b)

Bottom - up approach

(c)

Top - top approach

(d)

Bottom - real approach