std 8 gujarati ch 11 swadhyay , dhoran 8 gujarati ch 11 valavi ba aavi swadhyay , ધોરણ 8 ગુજરાતી કાવ્ય 11 વળાવી બા આવી સ્વાધ્યાય

2. Real and distinct 3. 1 2 4. No 6. Al real values 5. 11. f(r 2, whert is any real number 14. 64 Mcas 1. Tr the equation a U has real and distinct Toots, then 2. If rive equation 1 has twu distinct routs, then fb) Isil 2 try lal 2 (d) Norve of Lhese 3. the equation y 2-6 i o has equal Tools, then thr roots arr ha 4) If i br r. 0 has qual roots, then -I 5)If the equation arz 2r a has two distinct roots, if r (a) a ti b) 0 (ch w 0,1 (d) --1. e positive value of for which the e sr will both have real roots, is b) 8 (c) 12 (d) 16

Two equal volume flasks cotaining equal masses of H_(2) and CH_(4) are at 100 K and 200 K , repectively. The molecular diameter of CH_(4) is twice that of H_(2) . ( i ) Which of the following statement about Z_(1) (number of collisions per molecule per cm^(3) per second) is true? ( a ) Z_(11) of H_(2)=2Z_(1) of CH_(4) ( b ) Z_(11) of H_(2)=4Z_(1) of CH_(4) ( c ) Z_(11) of H_(2)=Z_(1) of CH_(4) ( d ) Z_(11) of H_(2)=8Z_(1) of CH_(4) ( ii ) Which of the following statement about Z_(11) (number of bimolecular collisions per cm^(3) per second) is true? ( a ) Z_(1) of H_(2)=4Z_(11) of CH_(4) ( b ) Z_(11) of H_(2)=8Z_(11) of CH_(4) ( c ) Z_(1) of H_(2)=16Z_(11) of CH_(4) ( d ) Z_(1) of H_(2)=32Z_(11) of CH_(4)

Matrix A ha s m rows and n+ 5 columns; matrix B has m rows and 11 - n columns. If both AB and BA exist, then (A) AB and BA are square matrix (B) AB and BA are of order 8 xx 8 and 3 xx 13, respectively (C) AB=BA (D) None of these

The matrix A has x rows and (x+5) column. If the matrix B has y rows and (11-y) columns & both AB and BA exist,then x=8 (b) x=3y=6 (d) y=8

A solution is prepared by mixing 8.5g of CH_(2)Cl_(2) and 11.95g of CHCl_(3) . If vapour pressure of CH_(2)Cl_(2) and CHCl_(3) at 298 K are 415 and 200 mm Hg respectively, the mole fraction of CHCl_(3) in vapour form is : ("Molar mass of Cl"="35.5 g mol"^(-1))