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Science Preparation for Engineering Entrance

(2670 Posts)

This thread is dedicated to preparation for Science section of Engineering Entrance exams like IITJEE, RPET, BITSAT, GCET, EAMCET, ISAT, KEAM, WBJEE etc. You may share questions related to all topics from Physics and Chemistry.

Question should not exceed 100 characters.Use add options for multiple choice questions and "Uploadimage/Add related data" for passage text papers.
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Abhisek Sen
Shared from IUPAC Nomenclature on 14 Jul, 2019 11:38 PM

IUPAC name of the organic compound that is written by the following structure is ________.

 
3,4,9-trimethyldecane
2,7,8-trimethyldecane
2-ethyl-3,8-dimethylnonane
8-ethyl-2,7-dimethylnonane
2,7-dimethyl-8-ethylnonane
Please type your answer before submitting.
Abhisek Sen
Posted on 14 Jul, 2019 11:38 PM

No the correct answer is 2,7,8-trimethyldecane, it is exceptional

Vinod Kulkarni
Posted on 24 Jun, 2019 8:09 AM
Show common data

Solve these three questions

Please type your answer before submitting.
Vinod Kulkarni
Posted on 24 Jun, 2019 8:09 AM

Please answer as early as possible

Anushka
Shared from Mock - 1 (Paper - 1) JEE (Advanced) on 26 May, 2019 10:58 AM

The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R. The charge density [charge per unit volume] is dependent only on the radial distance r from the centre of the nucleus as shown in figure. The electric field is only along the radial direction.

Figure :


For a = 0, the value of d (maximum value of as shown in the figure) is

 
Please type your answer before submitting.
Anushka
Posted on 26 May, 2019 10:58 AM

The answer to this question should be option b .you have solved it correctly till the end and in the last step you have not written 4 in the denominator after cross multiplying . it should hence be option b .please tell if i am wrong or right ?

Chandana
Shared from Mock - 4 (Paper - 2) JEE (Advanced) on 22 May, 2019 6:36 PM

Directions: The following question has four choices, out of which ONE or MORE are correct.

Which of the following statements is/are true?

 
When treated with bromine water, phenol gives 2, 4, 6-tribromophenol.
On treatment with dilute nitric acid at 293 K, phenol gives 2, 4, 6-trinitrophenol.
On reaction with concentrated sulphuric acid at 373 K, phenol gives 4-hydroxybenzene sulphonic acid.
With cold solution containing sodium nitrite and dilute HCl, phenol gives p-nitrosophenol.
Please type your answer before submitting.
Chandana
Posted on 22 May, 2019 6:36 PM

Incorrect explanation for 3rd statement

Aravind Madhavan
Shared from BITSAT Mock - 1 on 22 May, 2019 1:45 PM

If Earth is supposed to be a sphere of radius 'R' and if '' is the value of acceleration due to gravity at a latitude of 30°, while 'g' is at the equator, the value of '(g - )' is

 
Please type your answer before submitting.
Aravind Madhavan
Posted on 22 May, 2019 1:45 PM

This g mentioned in the equation provided in the solution is the value of acceleration due to gravity at poles. the value of g at equator is Rw^2 less than g.