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All posts related to Science

Anushka
Shared from Mock - 1 (Paper - 1) JEE (Advanced) on May 26, 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

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 ?

Tarun Kumar
Shared from Biology Test - 2 on May 24, 2019 10:31 PM

Which of the following is not a beneficial element required by higher plants?

 
Sodium
Cobalt
Silicon
All of the above
Molybdenum
Please type your answer before submitting.
Tarun Kumar

Question no 20 answer is c

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

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

Incorrect explanation for 3rd statement

Aravind Madhavan
Shared from BITSAT Mock - 1 on May 22, 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

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.

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Tazo Mazo
Shared from BITSAT Mock - 7 on May 22, 2019 11:10 AM

An aluminum sheet is horizontally mounted on a stand and has a hole of diameter 2m. An iron sphere of radius 2.004 m is resting on this hole. Initial temperature of this system is 25°C. Find at what temperature, the iron sphere will fall down through the hole in sheet.

(The coefficients of linear expansion for aluminum and iron are 2.4 × 10-4 and 8.6 × 10-5, respectively)

 
82°C
43°C
45°C
15°C
Please type your answer before submitting.
Tazo Mazo

Diameter , radius?