Recent questions tagged numerical-ability

+1 vote

3 answers

1

ISRO2020-55
If $x+2y=30$, then $\left(\dfrac{2y}{5}+\dfrac{x}{3} \right) + \left (\dfrac{x}{5}+\dfrac{2y}{3} \right)$ will be equal to $8$ $16$ $18$ $20$

asked Jan 13 in Numerical Ability by Satbir Boss (23.8k points) | 213 views

+3 votes

3 answers

2

ISI2014-DCG-10
The number of divisors of $6000$, where $1$ and $6000$ are also considered as divisors of $6000$ is $40$ $50$ $60$ $30$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 165 views

+1 vote

2 answers

3

ISI2014-DCG-16
The sum of the series $\dfrac{1}{1.2} + \dfrac{1}{2.3}+ \cdots + \dfrac{1}{n(n+1)} + \cdots $ is $1$ $1/2$ $0$ non-existent

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 83 views

+1 vote

2 answers

4

ISI2014-DCG-22
The conditions on $a$, $b$ and $c$ under which the roots of the quadratic equation $ax^2+bx+c=0 \: ,a \neq 0, \: b \neq 0 $ and $c \neq 0$, are unequal magnitude but of the opposite signs, are the following: $a$ and $c$ have the same sign while $b$ has the ... $c$ has the opposite sign. $a$ and $c$ have the same sign. $a$, $b$ and $c$ have the same sign.

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 50 views

+1 vote

1 answer

5

ISI2014-DCG-23
The sum of the series $\:3+11+\dots +(8n-5)\:$ is $4n^2-n$ $8n^2+3n$ $4n^2+4n-5$ $4n^2+2$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 56 views

+1 vote

1 answer

6

ISI2014-DCG-26
Let $x_1 > x_2>0$. Then which of the following is true? $\log \big(\frac{x_1+x_2}{2}\big) > \frac{\log x_1+ \log x_2}{2}$ $\log \big(\frac{x_1+x_2}{2}\big) < \frac{\log x_1+ \log x_2}{2}$ There exist $x_1$ and $x_2$ such that $x_1 > x_2 >0$ and $\log \big(\frac{x_1+x_2}{2}\big) = \frac{\log x_1+ \log x_2}{2}$ None of these

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 50 views

+1 vote

1 answer

7

ISI2014-DCG-30
Consider the equation $P(x) =x^3+px^2+qx+r=0$ where $p,q$ and $r$ are all real and positive. State which of the following statements is always correct. All roots of $P(x) = 0$ are real The equation $P(x)=0$ has at least one real root The equation $P(x)=0$ has no negative real root The equation $P(x)=0$ must have one positive and one negative real root

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 38 views

+1 vote

1 answer

8

ISI2014-DCG-36
Consider any integer $I=m^2+n^2$, where $m$ and $n$ are odd integers. Then $I$ is never divisible by $2$ $I$ is never divisible by $4$ $I$ is never divisible by $6$ None of the above

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 40 views

0 votes

0 answers

9

ISI2014-DCG-54
The number of real roots of the equation $1+\cos ^2x+\cos ^3 x – \cos^4x=5$ is equal to $0$ $1$ $3$ $4$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 39 views

0 votes

1 answer

10

ISI2014-DCG-55
If $a,b,c$ are sides of a triangle $ABC$ such that $x^2-2(a+b+c)x+3 \lambda (ab+bc+ca)=0$ has real roots then $\lambda < \frac{4}{3}$ $\lambda > \frac{5}{3}$ $\lambda \in \big( \frac{4}{3}, \frac{5}{3}\big)$ $\lambda \in \big( \frac{1}{3}, \frac{5}{3}\big)$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 33 views

0 votes

1 answer

11

ISI2014-DCG-56
Two opposite vertices of a rectangle are $(1,3)$ and $(5,1)$ while the other two vertices lie on the straight line $y=2x+c$. Then the value of $c$ is $4$ $3$ $-4$ $-3$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 21 views

+1 vote

1 answer

12

ISI2014-DCG-58
Consider a circle with centre at origin and radius $2\sqrt{2}$. A square is inscribed in the circle whose sides are parallel to the $X$ an $Y$ axes. The coordinates of one of the vertices of this square are $(2, -2)$ $(2\sqrt{2},-2)$ $(-2, 2\sqrt{2})$ $(2\sqrt{2}, -2\sqrt{2})$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 29 views

0 votes

1 answer

13

ISI2014-DCG-60
The equation of any circle passing through the origin and with its centre on the $X$-axis is given by $x^2+y^2-2ax=0$ where $a$ must be positive $x^2+y^2-2ax=0$ for any given $a \in \mathbb{R}$ $x^2+y^2-2by=0$ where $b$ must be positive $x^2+y^2-2by=0$ for any given $b \in \mathbb{R}$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 24 views

0 votes

0 answers

14

ISI2014-DCG-61
If $l=1+a+a^2+ \dots$, $m=1+b+b^2+ \dots$, and $n=1+c+c^2+ \dots$, where $\mid a \mid <1, \: \mid b \mid < 1, \: \mid c \mid <1$ and $a,b,c$ are in arithmetic progression, then $l, m, n$ are in arithmetic progression geometric progression harmonic progression none of these

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 23 views

0 votes

1 answer

15

ISI2014-DCG-62
If the sum of the first $n$ terms of an arithmetic progression is $cn^2$, then the sum of squares of these $n$ terms is $\frac{n(4n^2-1)c^2}{6}$ $\frac{n(4n^2+1)c^2}{3}$ $\frac{n(4n^2-1)c^2}{3}$ $\frac{n(4n^2+1)c^2}{6}$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 22 views

+1 vote

0 answers

16

ISI2014-DCG-65
The sum $\dfrac{n}{n^2}+\dfrac{n}{n^2+1^2}+\dfrac{n}{n^2+2^2}+ \cdots + \dfrac{n}{n^2+(n-1)^2} + \cdots \cdots$ is $\frac{\pi}{4}$ $\frac{\pi}{8}$ $\frac{\pi}{6}$ $2 \pi$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 51 views

0 votes

1 answer

17

ISI2014-DCG-67
Let $y=[\:\log_{10}3245.7\:]$ where $[ a ]$ denotes the greatest integer less than or equal to $a$. Then $y=0$ $y=1$ $y=2$ $y=3$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 16 views

0 votes

1 answer

18

ISI2014-DCG-68
The number of integer solutions for the equation $x^2+y^2=2011$ is $0$ $1$ $2$ $3$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 22 views

+1 vote

1 answer

19

ISI2014-DCG-69
The number of ways in which the number $1440$ can be expressed as a product of two factors is equal to $18$ $720$ $360$ $36$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 33 views

0 votes

1 answer

20

ISI2015-MMA-2
If $a,b$ are positive real variables whose sum is a constant $\lambda$, then the minimum value of $\sqrt{(1+1/a)(1+1/b)}$ is $\lambda \: – 1/\lambda$ $\lambda + 2/\lambda$ $\lambda+1/\lambda$ None of the above

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 49 views

+1 vote

1 answer

21

ISI2015-MMA-11
The number of positive integers which are less than or equal to $1000$ and are divisible by none of $17$, $19$ and $23$ equals $854$ $153$ $160$ none of the above

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 18 views

0 votes

1 answer

22

ISI2015-MMA-12
Consider the polynomial $x^5+ax^4+bx^3+cx^2+dx+4$ where $a,b,c,d$ are real numbers. If $(1+2i)$ and $(3-2i)$ are two two roots of this polynomial then the value of $a$ is $-524/65$ $524/65$ $-1/65$ $1/65$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 23 views

0 votes

1 answer

23

ISI2015-MMA-13
The number of real roots of the equation $2 \cos \left( \frac{x^2+x}{6} \right) = 2^x +2^{-x} \text{ is }$ $0$ $1$ $2$ infinitely many

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 17 views

0 votes

1 answer

24

ISI2015-MMA-14
Consider the following system of equivalences of integers, $x \equiv 2 \text{ mod } 15$ $x \equiv 4 \text{ mod } 21$ The number of solutions in $x$, where $1 \leq x \leq 315$, to the above system of equivalences is $0$ $1$ $2$ $3$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 15 views

0 votes

1 answer

25

ISI2015-MMA-15
The number of real solutions of the equations $(9/10)^x = -3+x-x^2$ is $2$ $0$ $1$ none of the above

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 20 views

+1 vote

2 answers

26

ISI2015-MMA-16
If two real polynomials $f(x)$ and $g(x)$ of degrees $m\: (\geq 2)$ and $n\: (\geq 1)$ respectively, satisfy $f(x^2+1)=f(x)g(x),$ for every $x \in \mathbb{R}$, then $f$ has exactly one real root $x_0$ such that $f’(x_0) \neq 0$ $f$ has exactly one real root $x_0$ such that $f’(x_0) = 0$ $f$ has $m$ distinct real roots $f$ has no real root

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 54 views

+1 vote

1 answer

27

ISI2015-MMA-17
Let $X=\frac{1}{1001} + \frac{1}{1002} + \frac{1}{1003} + \cdots + \frac{1}{3001}$. Then, $X \lt1$ $X\gt3/2$ $1\lt X\lt 3/2$ none of the above holds

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 24 views

+1 vote

1 answer

28

ISI2015-MMA-18
The set of complex numbers $z$ satisfying the equation $(3+7i)z+(10-2i)\overline{z}+100=0$ represents, in the complex plane, a straight line a pair of intersecting straight lines a point a pair of distinct parallel straight lines

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 28 views

0 votes

0 answers

29

ISI2015-MMA-27
Let $\cos ^6 \theta = a_6 \cos 6 \theta + a_5 \cos 5 \theta + a_4 \cos 4 \theta + a_3 \cos 3 \theta + a_2 \cos 2 \theta + a_1 \cos \theta +a_0$. Then $a_0$ is $0$ $1/32$ $15/32$ $10/32$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 18 views

0 votes

1 answer

30

ISI2015-MMA-28
In a triangle $ABC$, $AD$ is the median. If length of $AB$ is $7$, length of $AC$ is $15$ and length of $BC$ is $10$ then length of $AD$ equals $\sqrt{125}$ $69/5$ $\sqrt{112}$ $\sqrt{864}/5$

asked Sep 23, 2019 in Numerical Ability by Arjun Veteran (430k points) | 16 views

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