SUBHAM TUTORIAL

                                 SUBHAM TUTORIAL .                      MATTER IN OUR SURROUNDING 1.ANSWER THE FOLLOWINGS ??              Give reasons for the following observation;      Question. 1:   The smell of hot sizzling food reaches you several meters away, but to get the  smell from cold food you have to go close. Question.2: A diver is able to cut through water in swimming pool. Which property of matter does this observation show? Question. 3: What are characteristics of particles of matter? Question.4: Why are gases compressible not liquids? Question.5: Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container (c) A wooden table should be called solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need karat expert . Question.6: Liquids generally have lower density as that ice floats on water. Find out why? compared to solids. But you

                                                   SUBHAM TUTORIAL    1.Answer the following. 3(-1)= -3 (-1)×225=-225 (-21)×(-30)=+630 (-316)×(-1)=316 (-15)×0×(-18)=0 (-12)×(-11)×10=132×10=1320 9×(-3)×(-6)=9×18=162 (-18)×(-5)×(-4)=90×(-4)= -360 (-1)×(-2)×(-3)×4=2×(-12)= -24 (-3)×(-6)×(-2)×(-1)=18×2=36   2. Verify the following.   (a) 18×[7+(-3)]=[18×7]+[18×(-3)]   (b) (-21)×[(-4)+(-6)]=[(-21)×(-4)]+[(-21)×(-6)] Answre 2:-    (a)          L.H.S:                     18×[7+(-3)]=18×[7-3]=18×4=72           R.H.S:                      [18×7]+[18×(-3)]=126+(-54)=126-54=72         Therefore L.H.S=R.H.S verified    (B)         L.H.S:                    (-21)×[(-4)+(-6)]=(-21)×[-4-6]=(-21)×(-10)=210         R.H.S:                    [(-21)×(-4)]+[(-21)×(-6)]=[84]+[126]=210       Therefore L.H.S=R.H.S verified 3.      (i) For any integer a, what is (-1) × a equal to ?      (ii) Determine the integer whose product with (-1) is            (a)-22 (b) 37 (c)0