Staff Selection Commission Sub Inspector Exam
Question : Directions: Pointing towards a man, a lady said, "His brother is my mother's only daughter's husband's son's father". How is the man related to the lady's husband?
Option 1: Paternal uncle
Option 2: Brother
Option 3: Father
Option 4: Brother-in-law
Correct Answer: Brother
Solution : Following the instructions of the question, the family tree will be –
Here, the quadrilateral represents the male and the circular figure represents the female in the figure.
So, the man is the brother of the lady's husband. Hence, the second option is correct.
Question : A boat goes 2 km upstream and 3 km downstream in 20 minutes. It goes 7 km upstream and 2 km downstream in 53 minutes. What is the speed (in km/hr) of the boat in still water?
Option 1: $\frac{75}{7}$
Option 2: $\frac{120}{7}$
Option 3: $\frac{135}{7}$
Option 4: $\frac{150}{7}$
Correct Answer: $\frac{135}{7}$
Solution : Let the upstream speed be $x$ km/hr and the downstream speed be $y$ km/hr. A boat goes 2 km upstream and 3 km downstream in 20 minutes. According to the question, $\frac{2}{x} + \frac{3}{y} = \frac{20}{60}$ ⇒ $\frac{120}{x} + \frac{180}{y} =20$ ⇒ $\frac{240}{x} + \frac{360}{y}
Question : Which of the following countries contributes the maximum to the world's diamond supply?
Option 1: Russia
Option 2: U.S.A
Option 3: Japan
Option 4: South Africa
Correct Answer: Russia
Solution : The correct answer is Russia.
Russia is the leading producer and exporter of Diamonds in the world. It has the world's richest diamond reserves. Russia, Botswana, and Canada are the top 3 diamond-producing countries in the world. India is the 4th largest producer of
Question : Directions: In a certain code language, Live long is coded as mu ae, Road is long is coded as ae si du, and Game is live is coded as si mu zt. What is the code for the word Game?
Option 1: si
Option 2: mu
Option 3: zt
Option 4: ae
Correct Answer: zt
Solution : Given: 1. Live long⇒mu ae 2. Road is long⇒ae si du 3. Game is live⇒si mu zt
By comparing all the coded sentences, we find that – In sentences 1 and 2, long is a common word and ae is a common code. In sentences
Question : Directions: Arrange the following words as per order in the dictionary. 1. Centre 2. Center 3. Central 4. Centrum
Option 1: 2, 1, 3, 4
Option 2: 2, 3, 4, 1
Option 3: 3, 2, 1, 4
Option 4: 2, 3, 1, 4
Correct Answer: 2, 3, 1, 4
Solution : Given: 1. Centre 2. Center 3. Central 4. Centrum
Step 1: Compare the first letter of each word. Since all the words start with the same letter C, then move on to the next letter. Step 2: The second, third, and
Question : The HCF of two numbers 960 and 1020 is:
Option 1: 40
Option 2: 120
Option 3: 60
Option 4: 80
Correct Answer: 60
Solution : Factors of 960 = 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 Factors of 1020 = 2 × 2 × 3 × 5 × 17 $\therefore$ HCF of 960 and 1020 = 2 × 2 × 3 ×
Question : Who is referred to as the "Darwin of the 20th Century?"
Option 1: Katherine Esau
Option 2: Ernst Mayr
Option 3: Har Gobind Khorana
Option 4: Marshall Warren Nirenberg
Correct Answer: Ernst Mayr
Solution : The correct option is Ernst Mayr.
German-American biologist, ornithologist, and science historian Ernst Mayr (1904–2005) made important contributions to the disciplines of evolutionary biology and biology philosophy. He was instrumental in the contemporary synthesis of evolutionary theory, which combined Mendelian genetics and Darwinian
Question : The famous musician Ustad Sultan Khan is associated with which musical instrument?
Option 1: Drums
Option 2: Sarangi
Option 3: Tabla
Option 4: Flute
Correct Answer: Sarangi
Solution : The correct answer is Sarangi.
Ustad Khan was an Indian Sarangi player and also a classical vocalist from Sikar Gharana. He was also awarded the third highest civilian award, Padma Bhushan, by the government of India in 2010, and he died in 2011.
Question : Directions: If A denotes +, B denotes ×, C denotes –, and D denotes ÷, then what will be the value of the following expression? 144 C 8 B 20 A 81 D 3 = ?
Option 1: 23
Option 2: 11
Option 3: 45
Option 4: 21
Correct Answer: 11
Solution : Given: 144 C 8 B 20 A 81 D 3 = ?
After replacing the letters with the mathematical signs, we get – = 144 – 8 × 20 + 81 ÷ 3 = 144 – 8 × 20 + 27 = 144 – 160
Question : If $\left(5 \sqrt{5} x^3-3 \sqrt{3} y^3\right) \div(\sqrt{5} x-\sqrt{3} y)=\left(A x^2+B y^2+C x y\right)$, then what is the value of $(3 A-B-\sqrt{15} C)$?
Option 1: –3
Option 2: –5
Option 3: 8
Option 4: 12
Correct Answer: –3
Solution : Given: $\left(5 \sqrt{5} x^3-3 \sqrt{3} y^3\right) \div(\sqrt{5} x-\sqrt{3} y)=\left(A x^2+B y^2+C x y\right)$ ⇒ $\frac{(5 \sqrt{5} x^3-3 \sqrt{3} y^3)}{(\sqrt{5} x-\sqrt{3} y)}=\left(A x^2+B y^2+C x y\right)$ ⇒ $\frac{(x\sqrt{5})^3-(y\sqrt{3})^3)}{(\sqrt{5} x-\sqrt{3} y)}=(A x^2+B y^2+C x y)$ ⇒ $\frac{(\sqrt{5}x-\sqrt{3}y)(5x^2+\sqrt{15}xy+3y^2)}{(\sqrt{5} x-\sqrt{3} y)}=(A x^2+B y^2+C x y)$ ⇒ $5x^2+\sqrt{15}xy+3y^2=A x^2+B y^2+C
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