Which of the following element results in presence of free graphite in C.I.?

The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?

A

39

B

78

C

117

D

156

Identify the sentence in which the word element (s) refers to 'suitable or favourable environment. (1) There is an element of truth in your story. (2) Water is composed of elements of hydrogen and oxygen. (3) I feel out of my elements in political discussions. (4) Water is a natural element for fish

A

(4)

B

(3)

C

(1) and (2)

D

(1)

The __________ element must reference either an ‘altGlyphDef’ element or a ‘glyph’ element.

A

href

B

src

C

animate

D

altGlyph

কার্বন মৌল হীরা ও গ্রাফাইট-এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them. which of the following statements is incorrect?

A

উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon.)

B

হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2 (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)

C

উভয়ের দহন তাপ একই। (Both of them possesses the same heat of combustion.)

D

উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। Both of them possesses different electrical conductivity.)

কার্বন মৌল হীরা ও গ্রাফাইট -এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them, which of the following statements is incorrect?)

A

উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon )

B

হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2। (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)

C

উভয়ের দহন তাপ একই (Both of them possesses the same heat of combustion)

D

উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। (Both of them possesses different electrical conductivity)

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A

Silicon

B

Sulphur

C

Manganese

D

Phosphorus

Which of the following districts of Madhya Pradesh is known for the production of Graphite?

A

Shivpuri

B

Satna

C

Morena

D

Betul

If we burn graphite,

A

Residue will be left

B

No residue will be left

C

It will not burn

D

It will change into diamond

The graphite rods in the nuclear reactor

A

react with U to release energy

B

produce neutrons

C

undergo combustion which triggers the nuclear fission

D

convert fast moving neutrons into thermal neutrons

Diamond is harder than graphite because of :

A

Difference in layers of atoms

B

Tetrahedral structure of diamond

C

Difference of crystalline structures

D

None of these

Which of the following element results in presence of free graphite in C.I.?

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