आनुवंशिकता एवं जैव विकास - L2 | Chapter 9 | कक्षा 10 NCERT विज्ञान | Pooja Mam

A closed 10 L vessel contains 1 L water gas (1 : 1 CO : H_(2)) and 9 L air (20 % O_(2) by volume) at STP . The contents of the vessel are ignited . The number of moles of CO_(2) in the vessel is closed to :

9 xx 10^(22) atoms of Ar and n moles of O_(2) are kept in a vessel of capacity 5L at 1 atm and 27^(@)C . (Consider N_(A)=6 xx 10^(23), R=0.0821 L atm "mol"^(-1)K^(-1) ) : Find the mass of O_(2) in vessel:

9 xx 10^(22) atoms of Ar and n moles of O_(2) are kept in a vessel of capacity 5L at 1 atm and 27^(@)C . (Consider N_(A)=6 xx 10^(23), R=0.0821 L atm "mol"^(-1)K^(-1)) : If all the O_(2) in vessel , then:

Driver of a truck gets his steel petrol tank filled with 75 L of petrol at 10^(@)C . If a alpha_("steel") is 12 xx 10^(-6)//.^(@)C and gamma_("pet") is 9.5 xx 10^(-4)//.^(@)C the overflow of petrol at 30^(2)C is -

Assertion : To increase the length of a thin steel wire of 0.1 cm^(2) corss sectional area by 0.1% , a force of 2000 N is required, its Y= 200 xx 10^(9) N m ^(-2) . Reson : It is calculated by Y = (F//L)/(Axx DeltaL)

If L = 39.5 , Delta_(1) = 6 , Delta_(2) = 9 and c = 10 , then find the mode of the data .

S:x ^(2) + y ^(2) -8x + 10y =0 and L : x -y -9=0 are the equations of a circle and a line.

A object is placed at a distance of 20 cm to the left of and on the axis of a convex lens L_(1) of focal length 25 cm. A second convex lens L_(2) of focal length 20 cm is placed coaxially to the right of the lens L_(1) at a distance of 10 cm from L_(1) . Find the position of the image and its magnification. [24.4 cm,(10)/(9)]

The solubility product of PbI_2 is 8.0 xx 10^(-9) . The solubility of lead iodide in 0.1 molar solution of lead nitrate is x xx 10^(-6) mol /L. The value of x is __________. (Rounded off to the nearest integer ). [Given : sqrt(2) = 1.41]