Staff Selection Commission Sub Inspector Exam
Question : Which of the following is an indirect tax?
Option 1: Death duty
Option 2: Interest tax
Option 3: Goods and services tax
Option 4: Capital gains tax
Correct Answer: Goods and services tax
Solution : The correct answer is the Goods and services tax.
Goods and services tax (GST) is an indirect tax. It is a consumption-based tax that is levied on the supply of goods and services. Death duty, interest tax and capital gains tax are
Question : Small Pox is caused by:
Option 1: rubella virus
Option 2: variola virus
Option 3: varicella
Option 4: myxovirus
Correct Answer: variola virus
Solution : The correct option is the variola virus.
Smallpox is caused by the variola virus, which belongs to the genus Orthopoxvirus. It is a highly contagious and often severe disease that has been eradicated globally through vaccination efforts. The last naturally occurring case of
Question : Which among the following is not a logical operator in Boolean Algebra laws?
Option 1: AND
Option 2: OR
Option 3: NOT
Option 4: NAND
Correct Answer: NAND
Solution : The correct answer is NAND.
Boolean algebra is a way of formally specifying or describing a particular situation or procedure. It is a part of binary logic that uses algebraic expressions to describe the processing of binary variables through logic operations.
Question : Directions: Find the missing number from the given responses in the following question.
Option 1: 72
Option 2: 720
Option 3: 7200
Option 4: 38
Correct Answer: 720
Solution : In each figure, the number in the middle of the figure is the product of the numbers at the corners.
In the first figure→4 × 2 × 3 × 3 = 72 In the second figure→9 × 4 × 2 × 10 = 720 Similarly,
Question : The average marks of a class of 35 children is 35. The marks of one of the students, who got 35, were incorrectly entered as 65. What is the average of the class?
Option 1: 33.76
Option 2: 34.14
Option 3: 35.24
Option 4: 36.50
Correct Answer: 34.14
Solution : Difference of incorrect marks = – 65 + 35 = – 30 So, change in average = – $\frac{30}{35}$ = – 0.86 Correct average = 35 – 0.86 = 34.14 Hence, the correct answer is 34.14.
Question : Identify whether the given statements about p-block elements are correct or incorrect.
Statement A: In p-block elements, the last electron enters the outermost p orbital.
Statement B: The non-metals and metalloids exist only in the p-block of the periodic table.
Option 1: Both Statements A and B are correct.
Option 2: Only Statement A is correct.
Option 3: Both Statements A and B are incorrect.
Option 4: Only Statement B is correct.
Correct Answer: Both Statements A and B are correct.
Solution : The correct option is Both Statements A and B are correct.
In p-block elements, the last electron is added to the outermost p orbital. The p-block includes elements whose outermost electrons are in the p subshell.
Non-metals and
Question : An article is marked at 100% above its cost price. After allowing two successive discounts of 5% and 20% respectively on the marked price, it is sold at $x$% profit. What is the value of $x$?
Option 1: 48
Option 2: 75
Option 3: 72
Option 4: 52
Correct Answer: 52
Solution : Given: An article is marked at 100% above its cost price. After allowing two successive discounts of 5% and 20% respectively on the marked price, it is sold at $x$% profit. Use the formula, Profit percentage = $\frac{\text{SP – CP}}{\text{CP}}\times 100$, where $SP$, $CP$ are
Question : X can do a work in 3 days, Y can do three times the same work in 8 days, and Z can do five times the same work in 12 days. If they have to work together for 6 hours a day, then how much time will they take to complete the work?
Option 1: 4 hours
Option 2: 5 hours 20 minutes
Option 3: 4 hours 10 minutes
Option 4: 5 hours
Correct Answer: 5 hours 20 minutes
Solution : X can complete the work in 3 days. Y can do three times the same work in 8 days. Z does five times the same work in 12 days. Working hours per day = 6 hours Efficiency = $\frac{\text{Total work}}{\text{Total Time}}$ Let
Question : AB is the common tangent to both circles as shown in the given figure. What is the distance between the centres of the circles?
Option 1: 20 cm
Option 2: 15 cm
Option 3: 10 cm
Option 4: 30 cm
Correct Answer: 30 cm
Solution : Given that AB is the common tangent to both circles. In the circle with centre C, $\angle$CAE = 90° In the circle with centre D, $\angle$DBA = 90° and $\angle$AEC = $\angle$BED (vertically opposite angle) So, $\triangle$CAE $\sim$ $\triangle$DBC ⇒ $\frac{CA}{AE}=\frac{DB}{BE}$ ⇒ $\frac{4}{3}=\frac{DB}{15}$ ⇒
Question : If $x=\frac{\sqrt{3}-\sqrt{2}}{\sqrt{3}+\sqrt{2}}$ and $y=\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}$, then the value of $x^{3} + y^{3}$ is:
Option 1: 950
Option 2: 730
Option 3: 650
Option 4: 970
Correct Answer: 970
Solution : $x=\frac{\sqrt{3}-\sqrt{2}}{\sqrt{3}+\sqrt{2}}=\frac{(\sqrt{3}-\sqrt{2})×(\sqrt{3}-\sqrt{2})}{(\sqrt{3}+\sqrt{2})×(\sqrt{3}-\sqrt{2})}=(\sqrt{3}-\sqrt{2})^2$ = $5-2\sqrt6$ $y=\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}=\frac{(\sqrt{3}+\sqrt{2})×(\sqrt{3}+\sqrt{2})}{(\sqrt{3}-\sqrt{2})×(\sqrt{3}+\sqrt{2})}=(\sqrt{3}+\sqrt{2})^2$ = $5+2\sqrt6$ $⇒x+y=5-2\sqrt6+5+2\sqrt6 =10$ Also, $xy=(5-2\sqrt6)(5+2\sqrt6)=25-24=1$ $\therefore x^3+y^3=(x+y)^{3} -3xy(x+y)$ $=10^3-3\times 1 \times 10$ $=1000-30$ $= 970$ Hence, the correct answer is 970.
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