Staff Selection Commission Sub Inspector Exam
Question : A solid lead sphere of radius 11 cm is melted and recast into small solid spheres of radius 2 cm each. How many maximum numbers (in integers) of such spheres can be made?
Option 1: 125
Option 2: 166
Option 3: 30
Option 4: 100
Correct Answer: 166
Solution : According to the question Number of small spheres = $\frac{\text{Volume of solid sphere}}{\text{Volume of small sphere}}$ = $\frac{\frac{4}{3}\pi (11)^{3}}{\frac{4}{3}\pi (2)^{3}}$ = $\frac{1331}{8}$ = $166.375 \approx 166$ Hence, the correct answer is 166.
Question : Directions: Arrange the given words in the sequence in which they occur in the dictionary. 1. Nailed 2. Nailgn 3. Magazine 4. Monkey 5. Mend
Option 1: 35412
Option 2: 34521
Option 3: 34512
Option 4: 35142
Correct Answer: 35412
Solution : Given: 1. Nailed 2. Nailgn 3. Magazine 4. Monkey 5. Mend
Step 1: The first letter of each word is – N, N, M, M, M. Based on the alphabetical order of these letters, we can arrange them – Magazine, Monkey, Mend,
Question : Directions: Select the option related to the third term in the same way as the second term is related to the first term and the sixth term is related to the fifth term. 21 : 40 :: 16 : ? :: 26 : 50
Option 1: 25
Option 2: 40
Option 4: 35
Correct Answer: 30
Solution : Given: 21 : 40 :: 16 : ? :: 26 : 50
Subtract 1 from the number given in the first term, and then multiply the resultant by 2, to get the second term – Like, 21 : 40→(21 – 1) × 2 = 20
Question : Select the most appropriate option that can substitute the underlined segment in the given sentence.
I like to meeting of people who have travelled widely.
Option 1: like meeting people
Option 2: like meet to people
Option 3: like to be meeting people
Option 4: will like meeting with people
Correct Answer: like meeting people
Solution : The first option is correct.
Explanation: The verb like is followed by the gerund form of the verb when expressing enjoyment or preference for an activity. In this case, the correct construction is like meeting, where meeting is the gerund form of
Question : Directions: Study the given pattern carefully and select the number that can replace the question mark (?) in it.
Option 1: 36
Option 2: 32
Option 3: 42
Option 4: 38
Correct Answer: 42
Solution : Given:
Multiply the third number and the fourth number of the column by 1.5 to obtain the first and the second number.
In first column; 12 × 1.5 = 18; 16 × 1.5
Question : If $x$ and $y$ are real numbers, then the least possible value of $4 (x -2)^2+ (y-3)^2-2 (x-3)^2$ is:
Option 1: 3
Option 2: –4
Option 3: 1
Option 4: –8
Correct Answer: –4
Solution : Given: $x$ and $y$ are real numbers. The expression is $4 (x -2)^2+ (y -3)^2-2 (x-3)^2$ Use the algebraic identity, $(a-b)^2=a^2+b^2-2ab$ For the least possible value, substitute $(y-3)^2=0$ ⇒ $4 (x-2)^2+0-2 (x-3)^2$ $=4(x^2+4-2x)-2(x^2+9-6x)$ $=4x^2+16-8x-2x^2-18+12x$ $=2(x^2-1-2x)$ $=2(x^2+1-2x-2)$ $=2[(x-1)^2-2]$ For the least possible value, substitute $(x-1)^2=0$. ⇒
Question : Leukaemia is a cancer of the:
Option 1: Lungs
Option 2: Uterus
Option 3: Skin
Option 4: Blood
Correct Answer: Blood
Solution : The correct answer is Blood.
The rapid generation of aberrant white blood cells is the cause of leukaemia, a type of cancer that can be seen in the bone marrow and blood. These aberrant white blood cells hinder the bone marrow's capacity to generate red
Question : The HCF of the two numbers is 29, and the other two factors of their LCM are 15 and 13. The smaller of the two numbers is:
Option 1: 377
Option 2: 406
Option 3: 435
Option 4: 464
Correct Answer: 377
Solution : The HCF of the two numbers is 29, and the other two factors of their LCM are 15 and 13. So, numbers can be (29 × 13) and (29 × 15) i.e. 377 and 435 ⇒ Smaller number = 377 Hence, the correct answer is
Question : The value of $\frac{\sqrt{0.6912}+\sqrt{0.5292}}{\sqrt{0.6912}-\sqrt{0.5292}}$ is:
Option 1: 15
Option 2: 1.5
Option 3: 0.9
Option 4: 9
Correct Answer: 15
Solution : $\frac{\sqrt{0.6912}+\sqrt{0.5292}}{\sqrt{0.6912}-\sqrt{0.5292}}$ $=\frac{\sqrt{6912}+\sqrt{5292}}{\sqrt{6912}-\sqrt{5292}}$ $=\frac{\sqrt{12×576}+\sqrt{12×441}}{\sqrt{12×576}-\sqrt{12×441}}$ $=\frac{\sqrt{576}+\sqrt{441}}{\sqrt{576}-\sqrt{441}}$ $=\frac{24+21}{24-21}$ $=\frac{45}{3}$ $=15$ Hence, the correct answer is 15.
Question : Batholiths are landforms created by:
Option 1: groundwater
Option 2: volcanic activities
Option 3: fluvial action
Option 4: glaciers
Correct Answer: volcanic activities
Solution : The correct answer is volcanic activities.
A batholith is a large body of igneous rock formed beneath the Earth's surface by the intrusion and solidification of magma. It is a discordant intrusion. It cools very slowly resulting in a coarse-grained structure. It is
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