In germanium semiconductor at T 300 K, the acceptor concentrations is Na 1013 cm3 and donor concentration is Nd 0. The thermal equilibrium concentration p0 is

স্থির তাপমাত্রায় 30 cm (Hg) চাপে 200 cm3 হাইড্রোজেন গ্যাস এবং 40 cm (Hg) চাপে 300 cm3 নাইট্রোজেন গ্যাসকে 400 cm3 আয়তনের শূণ্য ফ্লাস্কে রাখা হলে মিশ্রণের মোট চাপ কত হবে?

A

40 cm (Hg)

B

30 cm (Hg)

C

35 cm (Hg)

D

45 cm (Hg)

The cut off voltage for diode of silicon semiconductor and germanium semiconductor is ____ volts.

A

0.5 and 0.1

B

0.7 and 0.3

C

1 and 0.5

D

0.5 and 1

The thermal-equilibrium concentration of hole p0 in silicon at T = 300 K is 1015 cm3. The value of n0 is

A

3.8 x 108 cm3

B

4.4 x 104 cm3

C

2.6 x 104 cm3

D

4.3 x 108 cm3

একটি অক্সিজেন সিলিন্ডারের আয়তন 10 x 105 cm3 এবং এতে 300 বায়ুমন্ডলীয় চাপে অক্সিজেন ভর্তি আছে। কিছুটা ব্যবহারের পর দেখা গেল যে, চাপ 200 বায়ুমন্ডলীয় চাপে নেমে গেছে। ব্যবহারকৃত অক্সিজেনের আয়তন কত?(The volume of an oxygen cylinder is 10 x 105 cm3 and pressure is 300 atm. After some use, the pressure drops to 200 atm. What is the volume of the used oxygen?)

A

1000 L

B

500 L

C

2000 L

D

1200 L

E

1500 L

"If a system A is in thermal equilibrium with B and B is in thermal equilibrium with C, then A and C are in equilibrium with each other". This is a statement of

A

Cyclic rute

B

Zeroth law of thermodynamics

C

First law of thermodynamics

D

Second law of thermodynamics

Consider the following statements:
The communication of an acceptance is complete
1. As against the acceptor when it comes to the knowledge of the proposer.
2. As against the proposer, when it is put in a course of transmission to him, so as to be out of the power of the acceptor.
Which of the statements given above is/are correct?

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

As per the Indian Contract Act, 1872, the communication of an acceptance is complete:
1. As against the acceptor when it comes to the knowledge of the proposer.
2. As against the proposer when it is put in a course of transmission to him so as to be out of the power of the acceptor.
Based on the above two propositions, decide:

A

Only (1) is correct

B

Only (2) is correct

C

Both (1) and (2) are correct

D

None of the above two propositions is correct

A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes.
Physics of Metals in Metallurgy mcq question image

Physics of Metals in Metallurgy mcq question image

A

Parameter	Energy-difference
Parameter	Column 1	Column 2	Column 3	Column 4
Band-gap	ΔE₂	ΔE₁	ΔE₂	ΔE₁
Electron affinity	$$\frac{{\Delta {E_1}}}{2}$$	ΔE₂ - ΔE₁	$$\frac{{\Delta {E_2}}}{2}$$	ΔE₂ - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$
Work function	ΔE₁ + ΔE₂	ΔE₂ - $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$	ΔE₁ - $$\frac{{\Delta {E_2}}}{2}$$	ΔE₂ + $$\left( {\frac{{\Delta {E_1}}}{2}} \right)$$

Column 1

B

Column 2

C

Column 3

D

Column 4

In silicon at T = 300 K the thermal-equilibrium concentration of electron is n0 = 5 x 10^4 cc. The hole concentration is

A

4.5 x 1015 cc

B

4.5 x 1015 m3

C

0.3 x 10-6 cc

D

0.3 x 10-6 m3

After photoisomerization of the retinal molecule, which amino acid residue becomes a proton acceptor of the donor proton from the retinal molecule?

A

Met69

B

Ala93

C

Lys216

D

Asp85

In germanium semiconductor at T 300 K, the acceptor concentrations is Na 1013 cm3 and donor concentration is Nd 0. The thermal equilibrium concentration p0 is

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