Mental Ability (NCO- Cyber Olympiad Class 9): Questions 13 - 18 of 219

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 410 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 300.00 or

Question number: 13

» Mental Ability » Basic Arithmetic

MCQ▾

Question

The bacteria in a culture grows by 20% in the first hour, decreases by 5% in the second hour and again increases by 10% in the third hour. If at the end of the third hour the count of bacteria is 9000. The original count of bacteria in the sample is________

Choices

Choice (4) Response
a.

11458

b.

11286

c.

11784

d.

11956

Question number: 14

» Mental Ability » Basic Algebra

MCQ▾

Question

The solution of the equations 5X4Y=12,4X+2Y=20 is

Choices

Choice (4) Response
a.

There is no solution

b.

X=8,Y=2

c.

X=0,Y=0

d.

X=4,Y=2

Question number: 15

» Mental Ability » Basic Algebra

MCQ▾

Question

When simplified and expressed with negative exponents, the expression (x+y)1(x1+y1) is equal to

Choices

Choice (4) Response
a.

x2+2x1y1+y2

b.

x2+y2

c.

x2+21x1y1+y2

d.

x1y1

Question number: 16

» Mental Ability » Basic Arithmetic

MCQ▾

Question

A bike travels 70 km from Rajkot to Jamnagar at 14 km per hour but returns the same distance at 15 km per hour. The average speed for the round trip is closest to

Choices

Choice (4) Response
a.

13 km/hr

b.

10km/hr

c.

12km/hr

d.

16km/hr

Question number: 17

» Mental Ability » Basic Algebra

MCQ▾

Question

(a+1a)=3 , then (a3+1a3) equals

Choices

Choice (4) Response
a.

18

b.

1033

c.

77

d.

33

Question number: 18

» Mental Ability » Basic Arithmetic

MCQ▾

Question

logxlogy=log(xy) Only if

Choices

Choice (4) Response
a.

xyy2=x

b.

x=y=1

c.

x=y=0

d.

x=xyy2

Sign In