Staff Selection Commission Combined Graduate Level Exam
Question : If $x=a^{\frac{1}{2}}+a^{-\frac{1}{2}}$, $y=a^{\frac{1}{2}}- a^{-\frac{1}{2}}$, then the value of $(x^{4}-x^{2}y^{2}-1)+(y^{4}-x^{2}y^{2}+1)$ is:
Option 1: 16
Option 2: 13
Option 3: 12
Option 4: 14
Correct Answer: 16
Solution : Given: $x=a^{\frac{1}{2}}+a^{\frac{-1}{2}}$ and $y=a^{\frac{1}{2}}-a^{\frac{-1}{2}}$ ⇒ $x=\sqrt{a}+{\frac{1}{\sqrt{a}}}$ and $y=\sqrt{a}-{\frac{1}{\sqrt{a}}}$ ⇒ $x+y=2\sqrt{a}$ and $x-y=\frac{2}{\sqrt{a}}$ So, $x^{4}-x^{2}y^{2}-1+y^{4}-x^{2}y^{2}+1$ = $x^{4}+y^{4}-2x^{2}y^{2}$ = $(x^{2}-y^{2})^{2}$ = $[(x-y)(x+y)]^{2}$ = $[(2\sqrt{a})(\frac{2}{\sqrt{a}})]^{2}$ = $16$ Hence, the correct answer is 16.
Question : The Constitution
Option 1: is silent on the president's re-election to the office.
Option 2: allows the re-election of a person to the president's post.
Option 3: restricts a person from remaining president for only two terms.
Option 4: has been amended to allow a person only one term as president.
Correct Answer: allows the re-election of a person to the president's post.
Solution : The correct answer is allows the re-election of a person to the president's post.
The Constitution establishes a federal, unitary, parliamentary form of government with particular elements. A person who currently holds or has previously held
Question : Select the option that expresses the given sentence in active voice.
The deer was killed by the boar.
Option 1: The deer killed the boar.
Option 2: The boar was killing the deer.
Option 3: The boar was killed by the deer.
Option 4: The boar killed the deer.
Correct Answer: The boar killed the deer.
Solution : The correct choice is the fourth option.
Active voice emphasises the doer of the action, while passive voice emphasises the receiver. To convert passive to active, we make the subject perform the action and rephrase the verb.
The structure of the
Question : What is the full form of ITCZ?
Option 1: Intertropical converter zone
Option 2: Intertropical convergence zone
Option 3: Intertropical centre zone
Option 4: None of these
Correct Answer: Intertropical convergence zone
Solution : The answer is the Intertropical convergence zone.
The Intertropical Convergence Zone is the official name of the ITCZ. The Intertropical Convergence Zone, or ITCZ, is the region around the equator where the trade winds from the Northern and Southern Hemispheres converge.
Question : Directions: In this question, three statements are given, followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follows/follow from the statements. Statements: I. Some rings are fingers. II. Some fingers are toes. III. No toe is an earring. Conclusions: 1. No earring is a ring. II. Some toes are rings.
Option 1: Neither conclusion I nor II follows
Option 2: Only conclusion II follows
Option 3: Only conclusion I follows
Option 4: Both conclusions I and II follow
Correct Answer: Neither conclusion I nor II follows
Solution : According to the given statements, the following diagram can be drawn:
Conclusion I: No earring is a ring – From, the above diagram, it can be seen that there is no direct relation between earring and ring. Therefore, this conclusion
Question : A sum of money at simple interest amounts to INR 1,200 in 3 years and INR 1,350 in 4 years. The sum is:
Option 1: INR 650
Option 2: INR 850
Option 3: INR 450
Option 4: INR 750
Correct Answer: INR 750
Solution : Total amount at the end of 4th year = INR 1,350 Total amount at the end of 3rd year = INR 1,200 Simple Interest (SI), at (4 – 3) = 1 year ⇒ (1350 – 1200) = INR 150. ⇒ SI at the end
Question : The arithmetic mean of the following data is _________. 23, 17, 20, 19, 21
Option 1: 20
Option 2: 19
Option 3: 23
Option 4: 21
Correct Answer: 20
Solution : Arithmetic mean $=\frac{\text{Sum of observations}}{\text{Number of observations}}$ $=\frac{23 + 17 + 20 + 19 + 21}{5}$ $=\frac{100}{5}$ $=20$ Hence, the correct answer is 20.
Question : Directions: Select the option that represents the letters that, when placed from left to right in the blanks below, will complete the letter series. _RQ_PR_S_ _QSPRQ_
Option 1: PQRSPR
Option 2: PSQPRS
Option 3: PSRQPS
Option 4: PRQSPS
Correct Answer: PSQPRS
Solution : Given: _RQ_PR_S_ _QSPRQ_
Check the order of the letters in the given series. To fill the series we have to divide the series – _RQ_ / PR_S / _ _QS / PRQ_ Let's check the options – First option: PQRSPR; PRQQ/ PR
Question : Directions: Select the set in which the numbers are related in the same way as the numbers of the given set. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) (5, 98, 9) (10, 168, 14)
Option 1: (1, 28, 3)
Option 2: (7, 108, 23)
Option 3: (15, 248, 19)
Option 4: (3, 88, 17)
Correct Answer: (1, 28, 3)
Solution : Given: (5, 98, 9); (10, 168, 14)
Like, (5, 98, 9)→(98 ÷ 7) – 5 = 14 – 5 = 9 (10, 168, 14)→(168 ÷ 7) – 10 = 24 – 10 = 14
Let's check the options – First option: (1, 28,
Question : Directions: Six friends J, K, L, M, N, and O are sitting around a circular table facing the centre. N is not an immediate neighbour of M. M is sitting to the immediate left of J. J is sitting opposite L, who is sitting to the immediate right of K. Who is sitting second to the left of L?
Option 1: M
Option 2: O
Option 3: K
Option 4: N
Correct Answer: N
Solution : Given: (i) M is sitting to the immediate left of J. J is sitting opposite L, who is sitting to the immediate right of K.
(ii) N is not an immediate neighbour of M.
So, N is sitting second to the left of L. Hence,
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