Staff Selection Commission Combined Graduate Level Exam
Question : If $P=2^2+6^2+10^2+14^2+....+ 94^2$ and $Q=1^2+5^2+9^2+...+81^2$, then what is the value of $P - Q$?
Option 1: 24645
Option 2: 26075
Option 3: 29317
Option 4: 31515
Correct Answer: 26075
Solution : Given: $P=2^2+6^2+10^2+14^2+....+94^2$ and $Q=1^2+5^2+9^2+...+81^2$ $⇒P-Q = (2^{2}-1^{2})+(6^{2}-5^{2})+(10^{2}-9^{2})+....+(82^{2}-81^{2})+86^{2}+90^{2}+94^{2}$ $⇒P-Q=3+11+19+27+.......+163(\text{A.P. with 21 terms})+86^{2}+90^{2}+94^{2}$ $⇒P-Q=\frac{21}{2}[2×3+(21–1)8]+86^{2}+90^{2}+94^{2}$ $⇒P-Q=\frac{21}{2}[6+(20)8]+86^{2}+90^{2}+94^{2}$ $⇒P-Q=\frac{21}{2}[166]+(90-4)^{2}+90^{2}+(90+4)^{2}$ $⇒P-Q=1743+(90^{2}-2×90×4+4^{2})+90^{2}+(90^{2}+4^{2}+2×90×4)$ $⇒P-Q=1743+8100+16+8100+8100+16$ $\therefore P-Q=26075$ Hence, the correct answer is 26075.
Question : Suman paid INR 9,600 in interest on a loan she obtained 5 years ago with a simple interest rate of 16%. What was the amount of the loan she had taken?
Option 1: INR 13,250
Option 2: INR 12,500
Option 3: INR 12,000
Option 4: INR 11,750
Correct Answer: INR 12,000
Solution : Let the principal be $\text{x}$. We know, Simple interest = $\frac{\text{Principal × Rate × Time}}{100}$ ⇒ $9600=\frac{\text{x × 16 × 5}}{100}$ ⇒ $\text{x}=\frac{\text{9600 × 100}}{\text{16 × 5}}$ ⇒ $\text{x}=12000$ Hence, the correct answer is INR 12000.
Question : The mean proportional of $(a+b)(a-b)^3,(a+b)^3(a-b)$ is:
Option 1: $(a+b)^2(a–b)^2$
Option 2: $(a+b)^2(a–b)$
Option 3: $(a+b)(a–b)^2$
Option 4: $a^2-b^2$
Correct Answer: $(a+b)^2(a–b)^2$
Solution : Let the mean proportion of $(a+b)(a-b)^3,(a+b)^3(a-b)$ be $x$. Mean proportion of $A$ and $B$ = $\sqrt{A×B}$ ⇒ $x=\sqrt{ (a+b)(a-b)^3 \times (a+b)^3(a-b)}$ ⇒ $x = \sqrt{(a+b)^4 (a-b)^4}$ ⇒ $x = (a+b)^2(a-b)^2$ Hence, the correct answer is $(a+b)^2(a-b)^2$.
Question : Which actinide, discovered by Glenn T. Seaborg in 1940, is used as a heat source for sensitive electrical components in satellites as well as a power source for satellites?
Option 1: Curium
Option 2: Plutonium
Option 3: Nobelium
Option 4: Americium
Correct Answer: Plutonium
Solution : The correct option is Plutonium.
Plutonium-238, an Actinide discovered by Glenn T. Seaborg in 1940, is utilised as both a power source and a heat source for delicate electrical components in spacecraft. With thermoelectric generators, the heat generated during the radioactive breakdown of Pu-238 can
Question : The centroid of a $\triangle ABC$ is G. The area of $\triangle ABC$ is 60 cm2. The area of $\triangle GBC$ is:
Option 1: 10 cm2
Option 2: 30 cm2
Option 3: 40 cm2
Option 4: 20 cm2
Correct Answer: 20 cm2
Solution : The area of triangle GBC is one-third of the area of $\triangle ABC$. Given that the area of $\triangle ABC$ is 60 cm2. The area of $\triangle GBC=\frac{1}{3} \times 60 = 20$ cm2 Hence, the correct answer is 20 cm
Question : Directions: Select one of the option figures that is embedded in the given figure (rotation is NOT allowed).
Option 1:
Option 2:
Option 3:
Option 4:
Correct Answer:
Solution : The embedded figure will have the same orientation as the main figure. Only the third option figure is embedded in the given figure.
Hence, the third option is correct.
Question : Directions: Select the figure that will come next in the following series.
Solution : Here, the pattern is as follows – 1. In each figure, the circle is rotating by 90° and also moving corner by corner in an anti-clockwise direction. 2. In each figure the arrow mark figure is rotating by 90° in a clockwise direction and moving side
Question : Select the most appropriate option that can substitute the underlined segment in the given sentence.
Abhijeet feels extremely tired after working all day long.
Option 1: depressed
Option 2: exhausted
Option 3: sleepy
Option 4: bare
Correct Answer: exhausted
Solution : The correct choice is the second option.
Exhausted is the word that describes someone who feels extremely tired after a long day of work, as it directly conveys the idea of physical fatigue and weariness.
The meanings of the other options are as follows:
Question : In the given figure, chords XY and PQ intersect each other at point L. Find the length of XY (in cm).
Option 1: 21
Option 2: 20
Option 3: 22
Option 4: 23
Correct Answer: 22
Solution : Given: PQ = 10 cm, QL = 5 cm, YL = 3 cm, and LX = (x + 3) cm. LQ × LP = LY × LX Placing the values in the above formula, 5 × 15 = 3 × (x + 3) ⇒ 75
Question : At what point does the line $3x+y=-6$ intercept the x-axis?
Option 1: (2, 0)
Option 2: (–2, 0)
Option 3: (0, –6)
Option 4: (0, 6)
Correct Answer: (–2, 0)
Solution : At an x-intercept, y = 0. So, 3x + 0 = – 6 Solving for x, ⇒ 3x = – 6 ⇒ x = – 2 So, the required intercept point = (–2, 0) Hence, the correct answer is (–2, 0).
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