Cet july

0 D. -1 E.-2

1. Which of the following is (are) false?
   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
   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=……….
   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=……….
   12 E. None of above
   15.(-4)-1+(-1)-4=……….
   34 D.-34 E.-114
   0.2-2 =……..
   125
4. Which of the following is (are) true?
   312<513
   A.1 only B. 2only C. 3 only D. 1 and 2 only E.1 and 3 only
   yyy =…….
   y12 B. y32 C.y54 D.y58 E.y78
5. x-2+y-2=……..
   A.(x+y)-2 B. (xy)-2 C. (x2+y2)(xy)-2 D.x2+y2 E. (xy)(x+y)-2
   20.If x4 =10, what is x6?
   10 B.100 C.100 10 D.1000 E.100010
   0.000004 =……….
   A.0.3 B.0.2001 C.0.1002 D.0.021 E.0.003
   5 + 2 and y= 5 - 2 ,then x2+y3=……….
   5 E.85
6. 5x+5x+1=150. then x=………..
   A.2 B.1 C.0 D.-1 E. -2
   7+3x = x7+3 , then x=……….
   A. 2 B.-2 C.4 D.-4 E. 2 or -2
   8 +12 =……..
   A. 2.82 B.3.14 C.4.28 D.6.28 E.3.46
   23x= 18 , then x=……..
   A.-2 B.-3 C.2 D.-6 E.6
   x+yx-1+ y-1 =………..
   x+yxy
   28.If (√5 -1)√k =√2 , then k=……….
   3-54 B. 3+54 C.5+2 D.√5 +6 E.2√5 + 6
   3n-2 × 92-n32-n = …………
   30.If xa(xa-1)a(xa)1-a=xk , then k=………
   A. 2a+1 B.a+a2 C.3a D.3a+1 E.a3+a
7. If 16x=4 and 5x+y=625 , then y=……….
   252 D. 72 E.1