Staff Selection Commission Combined Higher Secondary Level Exam
Question : The total number of prime factors in $4^{10}\times 7^{3}\times 16^{2}\times11\times 10^{2}$ is:
Option 1: 34
Option 2: 35
Option 3: 36
Option 4: 37
Correct Answer: 36
Solution : Given: $4^{10}\times7^{3}\times16^{2}\times11\times10^{2}$ Rewrite this equation with the prime factors. $(2^{2})^{10}\times7^{3}\times(2^{4})^{2}\times11\times2^{2}\times5^{2}$ = $2^{20+8+2}\times7^{3}\times11^{1}\times5^{2}$ = $2^{30}\times7^{3}\times11^{1}\times5^{2}$ Total number of prime factors = 30 + 3 + 1 + 2 = 36 Hence, the correct answer is 36.
Question : If three angles of a triangle are (2y + 40°), (5y – 60°), and (3y – 80°). Then what is the value of y?
Option 1: 30°
Option 2: 24°
Option 3: 28°
Option 4: 26°
Correct Answer: 28°
Solution : Given: Three angles of a triangle are (2y + 40°), (5y – 60°), and (3y – 80°). We know that the sum of all three angles of a triangle is 180°. Then, (2y + 40°) + (5y – 60°) + (3y – 80°) = 180°
Question : If $p^{3}+3p^{2}+3p=7$, then the value of $p^2+2p$ is:
Option 1: 4
Option 2: 3
Option 3: 5
Option 4: 6
Correct Answer: 3
Solution : Given that: $p^3 + 3p^2 + 3p = 7$ Adding unity to both sides, $p^3 + 3p^2 + 3p + 1 = 7 + 1$ ⇒ $(p+1)^3 = (2)^3$ ⇒ $p+1=2$ ⇒ $p = 1$ $\therefore p^2 + 2p = 1 + 2 \times 1
Question : Directions: Select the correct mirror image of the given figure when the minor is placed at MN as shown below.
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution : As per the mirror image properties, closer things appear closer to the mirror in the reflection. Here, according to the information provided, the mirror is placed on the right side of the figure (on line MN). So, the left side of the reflected image will appear
Question : Find the radius of the circle $x^2+y^2=25$.
Option 1: 25 units
Option 2: 5 units
Option 3: 2 units
Option 4: 12 units
Correct Answer: 5 units
Solution : Equation of a circle with centre (0,0): $x^2+y^2=r^2$ where $r$ is the radius of the circle. The radius of the circle $x^2+y^2=25$ ⇒ $r=\sqrt{25}$ = 5 units Hence, the correct answer is 5 units.
Question : Minorities Rights Day is observed in India on:
Option 1: 23rd December
Option 2: 5th September
Option 3: 1st December
Option 4: 18th December
Correct Answer: 18th December
Solution : The correct option is 18th December.
Every year on 18th December, Minorities Rights Day is observed in India to promote the rights of minority populations. This day also emphasises improving understanding of and educating the public on matters about minorities and their protection.
Question : Which of the following statements is correct regarding the features of a perfectly competitive market? I. The market consists of a large number of buyers and sellers. II. Information is perfect.
Option 1: Only I
Option 2: Neither I nor II
Option 3: Both I and II
Option 4: Only II
Correct Answer: Both I and II
Solution : The correct answer is Both I and II.
In a perfectly competitive market, there are many sellers, and there is easy entry and exit of firms and homogeneous products. In a competitive market, no single consumer or producer has the
Question : Directions: Select the option that is related to the fifth term in the same way as the second term is related to the first term and the fourth term is related to the third term. 20 : 1200 :: 28 : 2352 :: 50 : ?
Option 1: 7250
Option 2: 7500
Option 3: 7000
Option 4: 7550
Correct Answer: 7500
Solution : Given: 20 : 1200 :: 28 : 2352 :: 50 : ?
Find the square of the first number and then multiply by 3 to obtain the second number. Like, (20 : 1200)→(20)2 × 3 = 400 × 3 = 1200 And, (28 :
Question : if $a-b=3$ and $a^3-b^3=117$, then $|a+b|$ is equal to:
Option 1: 3
Option 2: 5
Option 3: 7
Option 4: 9
Correct Answer: 7
Solution : Given: a – b = 3 a3 – b3 = 117 We know, a3 – b3 = (a – b)3 + 3ab(a – b) ⇒ 117 = 27 + 3ab(3) ⇒ 9ab = 117 – 27 ⇒ 9ab = 90
Question : Directions: Which number from among the given options can replace the question mark (?) in the following series? 8, 11, 22, ?, 50, 53
Option 1: 37
Option 2: 42
Option 3: 35
Option 4: 25
Correct Answer: 25
Solution : Given: 8, 11, 22, ?, 50, 53
Add 3, and multiply 2 alternately to the numbers to obtain the next number of the series. 8 + 3 = 11; 11 × 2 = 22; 22 + 3 = 25; 25 × 2 = 50; 50
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