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All posts related to Science

Ganesh Sai
Shared from BITSAT Mock - 2 on Jun 24, 2020 3:09 PM

A uniform but time varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper as shown in the figure. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

 
is zero
decreases as
increases as r
decreases as
Please type your answer before submitting.
Sukumar Das

A time varying magnetic field produces an induced electric field.
rnE.* (2 pi r ) = (pi*a*a) dB/dt
rnE =( a*a /2r)(dB/dt)
rnso, E decreases as 1/r

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Rithika
Shared from Alkenes and Alkynes (Easy) on Jun 24, 2020 9:43 AM

In the presence of platinum catalyst, hydrocarbon A adds hydrogen to form n-hexane. When hydrogen bromide is added to A instead of hydrogen, only a single bromo compound is formed. Which of the following is A?

 
CH3 –– CH2 –– CH = CH –– CH2 –– CH3
CH3 –– CH2 –– CH2 –– CH = CH –– CH3
CH3 –– CH = CH –– CH2 –– CH2 –– CH3
CH2 = CH –– CH2 –– CH2 –– CH2 –– CH3
Please type your answer before submitting.
Rithika

Why cannot the answer be option 4?

Duvva Krupakar
Shared from EAMCET - 3 (Engineering) on Jun 21, 2020 7:35 PM

A bar magnet of magnetic moment M1 is axially cut into two equal parts. If these two pieces are arranged perpendicular to each other, the resultant magnetic moment is M2. Then the value of M1/M2 is

 
1
Please type your answer before submitting.
Duvva Krupakar

Any body there here to do this question

Akshita Bist
Shared from Mineral Nutrition (Class - XI) on Jun 18, 2020 1:04 AM

Which of the following is not an essential micronutrient?

 
Nickel
Manganese
Sodium
Boron
Please type your answer before submitting.
Vikash Kumar

Essential Micronutrients or trace elements are needed in very small amounts
rn(less than 10 mmole Kg -1 of dry matter). These include iron, manganese,
rncopper, molybdenum, zinc, boron, chlorine, and nickel

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Raunak Barath
Shared from Cell Structure and Function on May 30, 2020 10:44 AM

Which of the following were initially named sarcode by Dujardin and fila by Flemming, respectively?

 
Mitochondria and protoplast
Protoplasm and mitochondria
Lysosome and mitochondria
Sarcoplasm and flagella
#
Please type your answer before submitting.
Vikash Kumar

Sarcodes imply protoplasm of animals, Mitochondria were discovered by Kolliker (1880) in striated muscles of insects and given the present name by Benda (1898). Mitochondria were called sarcomeres by Kolliker (1880), fila by Flemming (1882), and bioblasts by Altman (1890).

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