J.K SIR

Write about the contributions of John Ray, J.D. Hooker and J.K. Maheshwari.

Sir J.C. Bose proposed in theory of ascent of sap known as

Statement/ कथन : I. All A are K./ सभी A, K है। II. Some J are K./कुछ J, K है। Conclusion/ निष्कर्ष: I. Some A are J./ कुछ A, J है। II. No K is J./ कोई K, J नहीं है। III. All K are J./ सभी K, J है।

Assertion : Crescograph was invented by Sir J.C. Bose. Reason: Crescograph can magnify the growth upto 10,000 times.

Structure Of Atom|Dalton's Atomic Theory|Discovery Of Electron (Sir J.J. Thomson)|Discovery Of Proton (Goldstein)|Discovery Of Neutron (James Chadwick)|Some Important Formulae And Conversions|OMR

The mean kinetic energy of a gas at 300K is 100J .The mean energy of the gas at 450K" is equal to (A) 100J (B) 3000J (C) 450J (D) 150J

If [I, j, k] be a set of orthogonal unit vectors, then fill up the blanks : (i) i.i +j.j +k.k =......... (ii) i.j+j.k+k.i. = .......... (iii) i.i =j.j =k.k = ......... (iv) i.j=j.k =k.i. = ........

The value of (r.i)i+(r.j)j+(r.k)k is