Class 12th

Class 12th Hooghly Engineering and Technology College

Contributor-Level 10

A particle moving with uniform speed in a circular path maintains varying velocity and varying acceleration. It is because direction of both velocity as well as acceleration will change continuously.

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7 months ago

Can I get admission in HETC for BTech with 60% in Class 12th?

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Sejal Baveja

Contributor-Level 10

Yes, a candidate can get admission in Hooghly Engineering and Technology College with 60% in Class 12. The minimum required aggregate for BTech admission is 45% (35% for reserved category). Though, candidates must submit the marksheets and certificate of Class 12 to apply for and confirm admission in the college.

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Class 12th Chemistry

Given below are two statements:

Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Statement II : The nucleophillic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Contributor-Level 10

Nucleophilic addition of sodium hydrogen sulphite to aldehyde or ketone is a;

$N a H S O_{3} ? N a^{+} + H S O_{3}^{?}$

So; nucleopilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.

Addition of hydrogen cyanide;

Final product is cyanohydrin.

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Direction for questions 17 to 20:

The bar chart shows average marks obtained in four different subjects for different years at A R Academy. Mark obtained in any subject in any year can be the multiples of five only.

The total average marks in the year 2020 is decreased with respect to the total average marks in year 2014 by

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Contributor-Level 10

(c)

Average marks in 2014 = 280

Average marks in 2020 = 270

Percentage decrease = 3.7%

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Class 12th Chemistry

The oxide without nitrogen-nitrogen bond is:

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Contributor-Level 10

All given oxide have nitrogen – nitrogen bond except N₂O₅ as ;

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Direction for questions 17 to 20:

The bar chart shows average marks obtained in four different subjects for different years at A R Academy. Mark obtained in any subject in any year can be the multiples of five only.

Find the year representing the maximum average marks, combining all the subjects.

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Contributor-Level 10

(c)

Year	Total marks
1994	280
1995	260
1996	260
1997	245
1998	280
1999	295
2000	270

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Direction for questions 17 to 20:

The bar chart shows average marks obtained in four different subjects for different years at A R Academy. Mark obtained in any subject in any year can be the multiples of five only.

The percentage increase in the average marks in Social science in 2016 with respect to previous year = N% and the percentage increase in the average marks in Biology in 2016 over the previous year = M%. Find M - N

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Contributor-Level 10

(a)

Percentage increase in average marks in social Science in 1996 over the previous year = 14.28%

Percentage increase on average marks in Biology in 1996 over the previous year = 20%

Difference = 20% - 14.28% = 5.72%

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Direction for questions 17 to 20:

The bar chart shows average marks obtained in four different subjects for different years at A R Academy. Mark obtained in any subject in any year can be the multiples of five only.

Which of the following subjects shows maximum increase in average marks over any two consecutive years?

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Contributor-Level 10

(b)

Maximum increase in average marks is observed for Social Science from 2017 to 2018.

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Five men decide to go shopping to Karol Bagh, Delhi. They arrived at the designated meeting place in the following order: 1. Raman, 2. Aman, 3. Dev, 4. Sanjay, and 5. Kamal. Each men spent at least Rs. 1000 below are some additional facts about how much they spent during their shopping spree.

i. The man who spent Rs. 2234 arrived before the man who spent Rs. 1193.

ii. One man spent Rs. 1340 and he was not Dev.

iii. One man spent Rs. 1378 more than Aman.

iv. One man spent Rs. 2517 and he was not Raman.

v. Sanjay spent more than Dev.

vi. Kamal spent the largest amount and Aman the smallest.

What was the amount spent by Kamal?

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Contributor-Level 10

One of the men spent 2517 – 1378 = 1139, he is Aman. This is the only possibility as we add Rs. 1378 even to the least amount Rs. 1193, we will not be able to satisfy all the conditions given simultaneously.

So, the table obtained is:

Raman	Aman	Dev	Sanjay	Kamal
2234	1139	1139	1340	2517

(c)

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Class 12th Chemistry

In the following sequence of reactions,

$C_{3} H_{6} \overset{H^{+} / H_{2} O}{\to} A \to_{d i l K O H}^{K Ι O} B + C$

The compounds B and C respectively are:

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