1. An electron falls through a distance of 1.5cm in a uniform  electric field of magnitude 2_*10⁴ N\C. now the direction of the field is reverse keeping the magnitude unchanged and a proton falls through the same distance. Compute the time of fall in each case, nelecting gravity

1. Two identical bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. this whole system is taken into an orbiting artificial sattelite, then find the tension in strings.

A charge Q₁=+1C and Q₂=^_4C are fixed at a separation of 1m. Where should you place the third charge 'q' so that entire system is in equillibrium? and also calculating charge on 'q'.

Sir,

The course name -NEET year long course the lecture number is #16-10.chapter name periodic table and periodicity inorganic chemistry. Topic name -stable oxidation state of d block elements. Time 22:41..i hope u know my doubt... Otherwise I can send it again..  Please expain me it with a complete elaborated form. ..so I could understand properly       

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is (a) one (b) two (c) five (d) one fifth 

Pls give detailed explanation 

An organic compounds A(C4H9CI) on reaction with Na/ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then A is-
(1) t-butyl chloride
(2) sec.-butyl chloride
(3) Iso-butyl chloride
(4) n-butyl chloride

in ur notes is is written that tert alkyl halide doesnt produce alkane through wurtz reaction

plz help me out.

Q1 How does species diversity change at latitude and altitude level? (explain)?

Q2 Each organism has an invariably defined range of conditons that it can tolerate, diversity in the resources it utilises and a distinct functional role in the ecological system, all these together comprise its niche. (ncert page no 221) Sir i can't understand the meaning of this statement please explain 

1. What is the difference between clone and somaclone

Which of the following is an important factor for origin of new species :-

(1)Adaptation

(2)Close inbreeding

(3)Asexual reproduction

(4)Isolation

Common cold is caused by which virus? Influenza virus or Rhino Virus??