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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
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.
Question : The ratio of milk to water in a 100-litres mixture is 2 : 3. 10 litres of this mixture is withdrawn and replaced with milk.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%
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 =
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
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 =
Question : Directions: In this question, a word is represented by only one set of numbers, as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets, as in the two matrices given below. The columns and rows of Matrix (I) are numbered from 0 to 4, and those of Matrix (II) are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column e.g. – E can be represented by 04, 21 etc., and P can be represented by 56, 79 etc. Similarly, you have to identify the set for the word MAXI.
Option 1: 76, 56, 34, 57
Option 2: 68, 00, 65, 76
Option 3: 86, 66, 56, 67
Option 4: 67, 65, 44, 75
Correct Answer: 68, 00, 65, 76
Solution : Given: MAXI
Number representations of each letter – M→59, 68 A→00, 44 X→65, 78, 97 I→57, 76
Let's check the options – First option: 76, 56, 34, 57 – M and A cannot be represented by 56 and 34. Second option: 68,
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
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 –
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
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
Question : Directions: By folding the given paper, which of the following boxes cannot be made?
Option 1:
Option 2:
Option 3:
Option 4:
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
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
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
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
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;
Question : Rukmini Devi Arundale was awarded with "Padma Bhushan" in the year________.
Option 1: 1956
Option 2: 1987
Option 3: 1978
Option 4: 1964
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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