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15 Views

Question : If $x+\frac{1}{x}=2 \sqrt{5}$ where $x>1$, then the value of $x^3-\frac{1}{x^3}$ is:

Option 1: 82

Option 2: 76

Option 3: 86

Option 4: 78

Team Careers360 21st Jan, 2024

Correct Answer: 76


Solution : Given: $x+\frac{1}{x}=2 \sqrt{5}$
⇒ $(x+\frac{1}{x})^2=(2 \sqrt{5})^2$
⇒ $x^2+\frac{1}{x^2}+2=20$
⇒ $x^2+\frac{1}{x^2}=18$ -------------(i)
⇒ $x^2+\frac{1}{x^2}-2=18-2=16$
⇒ $(x-\frac{1}{x})^2=(4)^2$
⇒ $x-\frac{1}{x}=4$ -------------(ii)
So, $x^3-\frac{1}{x^3}$ = $(x-\frac{1}{x})(x^2+\frac{1}{x^2}+x×\frac{1}{x})$
= 4 × (18 + 1)
= 76
Hence, the correct answer is 76.

110 Views

Question : The ratio of milk to water in a 100-litres mixture is 2 : 3. 10 litres of this mixture is withdrawn and replaced with milk. This process is repeated 2 more times. What is the percentage of milk in the final mixture?

Option 1: 56.26%

Option 2: 54.27%

Option 3: 58.21%

Option 4: 51.24%

Team Careers360 20th Jan, 2024

Correct Answer: 56.26%


Solution : Proportion of water after replacement = Proportion of water before replacement × ($\frac{\text{Volume before addition}}{\text{Volume after addition}}$)(number of replacements) 
⇒ Proportion of water after replacement = $\frac{3}{5} × (\frac{90}{100}$)3 
= $\frac{2187}{5000}$
So, the volume of water after replacements = $\frac{2187}{5000}$ × 100
=

81 Views

Question : Three numbers are in the ratio 2 : 3 : 5 and their LCM is 60. What is the HCF of the numbers?

Option 1: 2

Option 2: 4

Option 3: 10

Option 4: 6

Team Careers360 23rd Jan, 2024

Correct Answer: 2


Solution : Given,
Three numbers are in the ratio 2 : 3 : 5 and their LCM is 60.
Let the number be $2x$, $3x$, and $5x$.
⇒ LCM of ($2x$, $3x$ and $5x$) $=2 × 3 × 5 × x=30x$
According to the question
$30x =

16 Views

Question : Directions: Select the option in which the number-pair shares the same relationship as that is shared by the following number-pair.
7 : 31

Option 1: 11 : 37

Option 2: 11 : 28

Option 3: 11 : 47

Option 4: 11 : 12

Team Careers360 20th Jan, 2024

Correct Answer: 11 : 47


Solution : Given:
7 : 31

Multiply the first number by 4 and then add 3 to it, to get the second number in each pair –
7 : 31→(7 × 4) + 3 = 28 + 3 = 31

Let's check the options –

18 Views

Question : Select the most appropriate option to fill in the blank.
The park is a/an ______ place to stroll and exercise.

Option 1: unopen

Option 2: doubtful

Option 3: ideal

Option 4: fussy

Team Careers360 22nd Jan, 2024

Correct Answer: ideal


Solution : The third option is the correct answer.

Explanation:
Ideal means perfect or best suited for a particular purpose. In the context of the sentence, describing the park as an ideal place suggests that it is well-suited for strolling and exercising.

The meanings of other options

15 Views

Question : Directions: By folding the given paper, which of the following boxes cannot be made?

Option 1:

Option 2:

Option 3:

Option 4:

Team Careers360 22nd Jan, 2024

Correct Answer:


Solution : In the 3D view of dice,
1. Each face out of the three faces in the 3D view should be from all the pairs.
2. Two opposite faces cannot appear adjacently in the 3D view of a folded cube figure.
So, the opposite pairs of faces

16 Views

Question : The word 'direct free kick' is related to which of the following sports?

Option 1: Basketball

Option 2: Baseball

Option 3: Volleyball

Option 4: Football

Team Careers360 21st Jan, 2024

Correct Answer: Football


Solution : The correct option is Football.

The word "direct free kick" refers to the sport of football, which is sometimes referred to as soccer worldwide. In football, a team is awarded a direct free kick when the opposing team fouls and the kick can be made

16 Views

Question : Directions: Select the number that can replace the question mark (?) in the following series.
1, 1, 2, 3, 7, 22, ?

Option 1: 157

Option 2: 156

Option 3: 155

Option 4: 152

Team Careers360 21st Jan, 2024

Correct Answer: 155


Solution : Given:
1, 1, 2, 3, 7, 22, ?

Multiply the first two terms and then add 1 to obtain the third term and follow the same pattern for the next term.
(1 × 1) + 1 = 2; (1 × 2) + 1 = 3;

23 Views

Question : Rukmini Devi Arundale was awarded with "Padma Bhushan" in the year________.

Option 1: 1956

Option 2: 1987

Option 3: 1978

Option 4: 1964

Team Careers360 24th Jan, 2024

Correct Answer: 1956


Solution : The correct answer is 1956.

Rukmini Devi Arundale was an Indian theosophist, dancer, and choreographer of the Indian classical dance form of Bharatanatyam. She worked for the revival of Bharatanatyam from its original "Sadhir style" prevalent amongst the temple dancers, the Devadasis.

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