If a=bx, b=cy and c=az then the value of xyz is equal to
A
–1
B
0
C
1
D
abc
Check Answer
Right Answer:
C
1
Q2 :
A bill for Rs. 40 is paid by means for Rs. 5 notes and Rs. 10 notes. Seven notes are used in all. If x is the number of Rs. 5 notes and y is the number of Rs 10 notes then
A
x+y=7 and x+2y=40
B
x+y=7 and x+2y=8
C
x+y=7 and 2x+y=8
D
x+y=7 and 2x+y=40
Check Answer
Right Answer:
B
x+y=7 and x+2y=8
Q3 :
if 1+72955=1+27x, then the value of x is
A
1
B
3
C
5
D
7
Check Answer
Right Answer:
A
1
Q4 :
If 5x3+5x2−6x+9 is divided by (x+3), then the remainder is:
A
135
B
-135
C
63
D
-63
Check Answer
Right Answer:
D
-63
Q5 :
If x+y=2, then the value of x4+y4−x3y2−x2y3+16xy is equal to
A
16
B
32
C
4
D
2
Check Answer
Right Answer:
A
16
Q6 :
If the roots of the equation ax2+2bx+c=0 are α and β is equal to
A
ac2b
B
−ac2b
C
ac2b
D
ac−b
Check Answer
Right Answer:
B
−ac2b
Q7 :
If 2x=4y=8z and xyz=288, then 2x1+4y1+8z1 is equal to
A
811
B
2411
C
4811
D
9611
Check Answer
Right Answer:
A
811
Q8 :
if (ba)x−1=(ab)x−3, then the value of x is
A
1
B
2
C
3
D
4
Check Answer
Right Answer:
B
2
Q9 :
The solution of the equation 2x−7=256 is
A
7
B
8
C
15
D
1
Check Answer
Right Answer:
C
15
Q10 :
x varies inversely as the square of y. Given that y=2 for x=1. The value of x for y=6 will be equal to
A
3
B
9
C
31
D
91
Check Answer
Right Answer:
D
91
Q11 :
x4−mx3+2x2−5x+8=0, when divided by x−2, gives remainder as 3m. Then the value of 3m is equal to
A
8−22
B
-2
C
2
D
822
Check Answer
Right Answer:
C
2
Q12 :
If xm=yn=zp,xyz=1 and m≠0, then m1+n1+p1 is equal to
A
0
B
3
C
-2
D
-3
Check Answer
Right Answer:
A
0
Q13 :
The value of k, for which the system of equations x+2y+7=0 and 2x+ky+14=0 will have infinitely many solutions, is
A
2
B
4
C
6
D
8
Check Answer
Right Answer:
B
4
Q14 :
Roots of the equation x2+x(2−p2)−2p2=0 are
A
−p2 and −2
B
p2 and −2
C
−p2 and 2
D
p2 and 2
Check Answer
Right Answer:
B
p2 and −2
Q15 :
If one root of the equation ax2+bx+c=0,a≠0, is reciprocal of the other, then
A
b=c
B
a=c
C
a=0
D
b=0
Check Answer
Right Answer:
B
a=c
Q16 :
If α and β are the roots of the equation x2−px+q=0, then the equation whose roots are αβ+α+β and αβ−α−β is
A
x2+qx−p=0
B
x2+2qx+p2+q2=0
C
x2−2qx+q2−p2=0
D
x2+2qx+p2−q2=0
Check Answer
Right Answer:
C
x2−2qx+q2−p2=0
Q17 :
Roots of the equation (a−b)(a−c)(x−b)(x−c)a2+(b−c)(b−a)(x−a)(x−c)b2=x2 are
A
1, 1
B
a, 0
C
b, 0
D
a, b
Check Answer
Right Answer:
D
a, b
Q18 :
Solution of 42x=321 is
A
45
B
4−5
C
43
D
2−5
Check Answer
Right Answer:
B
4−5
Q19 :
If 102y=25, then to 10−y equals
A
−51
B
6251
C
501
D
51
Check Answer
Right Answer:
D
51
Q20 :
If x=231+231, then the value of 2x3−6x will be:
A
5
B
6
C
8
D
10
Check Answer
Right Answer:
A
5
Q21 :
If a+b+c=2s, then the value of (s−a)2+(s−b)2+(s−c)2+s2 will be:
A
s2+a2+b2+c2
B
a2+b2+c2
C
s2−a2−b2−c2
D
4s2−a2−b2−c2
Check Answer
Right Answer:
B
a2+b2+c2
Q22 :
If a3=117+b3 and a=3+b, then the value of a+b is:
A
±7
B
49
C
0
D
±13
Check Answer
Right Answer:
A
±7
Q23 :
If am+5=22m+10, then, using the law of indices, the value of a is:
A
3
B
4
C
5
D
6
Check Answer
Right Answer:
B
4
Q24 :
If α,β,γ and δ are the roots of the polynomial equation (x2−3x+4)(x2+2x+5)=0 then quadratic equation whose roots are α+β+γ+δ and αβγδ is:
A
x2−x+20=0
B
x2−5x+20=0
C
x2+x−20=0
D
x2−x−10=0
Check Answer
Right Answer:
A
x2−x+20=0
Q25 :
The solution for real x in equation x2−2x+1<0 is:
A
1
B
-1
C
0
D
non-existent
Check Answer
Right Answer:
D
non-existent
Q26 :
If x+y=1, then the largest value of xy is
A
1
B
0.5
C
0.4
D
0.25
Check Answer
Right Answer:
D
0.25
Q27 :
If x−y=1 and x2+y2=41, then the value of x+y will be:
A
±9
B
±1
C
5 or 4
D
−5 or −4
Check Answer
Right Answer:
A
±9
Q28 :
If yx+xy=310 and x+y=10, then the value of xy will be:
A
36
B
24
C
16
D
9
Check Answer
Right Answer:
D
9
Q29 :
If a=3 and b∗c=2bc(b−c)+(b2−c2) then calculate a×b∗c for b=7,c=3—