Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its

Water separometer index (modified) (WSIM) of a petrofuel is the measure of its

A

Emulsification tendency

B

Water separation characteristics

C

Water content

D

Water absorbing capacity from atmosphere

শূন্য মাধ্যমে আলোর বেগ C পানি ও হীরকের প্রতিসরাঙ্ক যথাক্রমে 1.33 ও 2.66 হলে পানিতে আলোর (Velocity of light in free space is c. Refractive indices of water and diamond 1.33 and 2.66 respectively. The velocity of light in water is)

A

1.33 c

B

1.33c/2.66

C

c / 1.33

D

c/2.66

High aniline point of a petrofuel (say diesel) indicates that

A

It is highly aromatic in nature

B

It is highly paraffinic in nature

C

It has a very low diesel index

D

Its ignition quality is very poor

Pour point of a petrofuel is

A

Multiple of 3°F

B

Multiple of 5°F

C

5°C below the temperature at which oil ceases to flow

D

None of these

পানির প্রতিসারঙ্ক ( refractive index) 1.3 হলে পানিতে আলোর বেগ (velocity of light) কত? শুন্যস্থান (vacuum) - এ আলোর বেগ3×108m/s

A

3.31 ×108 m/s

B

2.31 ×108 m/s

C

2 ×108 m/s

D

4.31 ×108 m/s

Dew point temperature always gives an indication of the __________ of the moist air.

A

Dryness

B

Moisture content

C

Coolness

D

Latent heat

Specific gravity of a petroleum product gives an indication of its

A

Degree of refinement

B

Hydrocarbon content type (aromatic or paraffinic)

C

Ease of atomisation

D

Sulphur content

Which of the following medium has the lowest refractive index?

A

Petrol

B

Oil

C

Air

D

Diamond

Which of the following has the highest value of refractive index?

A

Brine (sea water)

B

Diamond

C

Distilled water

D

Glass

একটি জলাশয় (pond) এর প্রকৃত গভীরতা (real depth) 6 m. যদি পানির প্রতিসরাঙ্ক (refractive index) 4/3 হয়, তবে এর আপাত গভীরতা (apparent depth ) কত?

A

4m

B

5m

C

4.5 m

D

5.5 m

Refractive index of a petrofuel which is the ratio of velocity of light in air to its velocity in the petrofuel gives an indication if its

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