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Staff Selection Commission Sub Inspector Exam

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17 Views

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

Team Careers360 14th Jan, 2024

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

7 Views

Question : Small Pox is caused by:

Option 1: rubella virus

Option 2: variola virus

Option 3: varicella

Option 4: myxovirus

Team Careers360 22nd Jan, 2024

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

8 Views

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

Team Careers360 20th Jan, 2024

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.

14 Views

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

Team Careers360 17th Jan, 2024

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,

10 Views

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

Team Careers360 16th Jan, 2024

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.

18 Views

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

Team Careers360 19th Jan, 2024

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

19 Views

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

Team Careers360 17th Jan, 2024

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

51 Views

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

Team Careers360 23rd Jan, 2024

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
⇒ $\frac{CA}{AE}=\frac{DB}{BE}$
⇒ $\frac{4}{3}=\frac{DB}{15}$

13 Views

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

Team Careers360 19th Jan, 2024

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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