Rev g9Mat

of 2-1-1-1is
A.2 B.-2 C.-12 D.14 E.12
7.532532 =…….
A.1 B.0 C.25 D.125 E.625
8.-1-1 +-10 =……….
A. 2 B.1 C.0 D. -1 E.-2

1. Which of the following is (are) false?
   1.a+b2 =a2 +b2 2.a+b =a +b 3.(ab)2 =a2b2
   A.1 only B. 2only C. 3 only D. 1 and 2 only E. None of these
   10.a2+b22a+ba-b2 =………….
   A.(a+b)3 B.(a-b)3 C.(a-b)(a+b) D.(a-b)2 (a+b) E.(a-b)(a+b)3
   11.If 152x+1=1 ,then x=……….
   A. -1 B. 0 C. 12 D. -12 E.-2
2. If (0.2)x=125 , then x=………
   A. -3 B.0 C.3 D.4 E.5
3. If 4x+1=8x, then x=……..
   A. -3 B.-2 C.-1 D.1 E.2
   14.If 3x+1=8x+1, then x=……….
   A.0 B. -1 C.1 D.12 E. None of above
   15.(-4)-1+(-1)-4=……….
   A. -2 B.-4 C.34 D.-34 E.-114
4. 0.2-2 =……..
   D. 1:1 (or) 2:3 E. 3:2 (or) 1:1
5. If xy = x + y, where x and y are real numbers, then y cannot be
   A.0 B.1 C. -1 D.2 E. -2
6. If 3a = 4b = 5c, then 1a:1b:1c =…………
   A. 13:14:15 B.15 :14: 13 C. 14:15:13 D. 3:4:5 E.5:4:3
7. If x:y:z =2:3:4 and x + y +z = 18 , then xyz = …………
   A.12 B.48 C.192 D.256 E.512
8. If (5x-4y) = 4(2x-3y) , then x : y = ……….
   A. 3:8 B. 8:3 C. 12: 17 D. 6:-13 E. 13:18
9. If x:y = 2:3 , find (x2 + y2):(x2-y2).
   A. 2:5 B. 13:-5 C.6:13 D. 6:-13 E. (9:13)
   20.Let x,y,z be three unequal numbers . Which of the following is (are) equal to x:y:z?
   1.5x: 5y : 5z 2. x+1 : y+1 : z+1 3. x2 : y2 : z2
   A.1 only B. 2 only C. 1 and 2 only D. 2 and 3 only E. 1,2 and 3