Staff Selection Commission Combined Graduate Level Exam
Question : A, B and C together can complete a work in 12 days. A and B alone can do the same work in 36 days. In how many days can C alone complete the same work?
Option 1: 48
Option 2: 25
Option 3: 12
Option 4: 36
Correct Answer: 36
Solution : Given: A and B alone can do the same work in 36 days. Let the total work = LCM of (12, 36, 36) = 36 units Efficiency of A $=\frac{36}{36} = 1$ unit per day Efficiency of B $=\frac{36}{36} = 1$ unit per day Efficiency
Question : Direction: Select the missing number from the given responses.
Option 1: 14
Option 2: 16
Option 3: 21
Option 4: 22
Correct Answer: 16
Solution : Given:
The middle number in a row is the product of the first number and the square root of the third number.
In row 1, the square root of 4 = 2 and 14 = 7
Question : G is the centroid of the equilateral triangle ABC. If AB = 10 cm, then the length of AG (in cm) is:
Option 1: $\frac{5 \sqrt3}{3}$
Option 2: $\frac{10 \sqrt3}{3}$
Option 3: $5 \sqrt3$
Option 4: $10\sqrt 3$
Correct Answer: $\frac{10 \sqrt3}{3}$
Solution : AB = 10cm Since AD is the perpendicular bisector of BC, ⇒ BD = 5cm and $\angle$ADB = 90° ⇒ AD = $\sqrt{\text{AB}^{2}-\text{BD}^{2}}$ = $\sqrt{10^{2}-5^{2}}$ = $\sqrt{75}$ = $5\sqrt{3}$ cm Since G is the centroid, AG : GD = 2 : 1 ⇒ AG
Question : If $(\sin \theta+\operatorname{cosec} \theta)^2+(\cos \theta+\sec \theta)^2=k+\tan ^2 \theta+\cot ^2 \theta$, then the value of $k$ is equal to:
Option 1: 7
Option 2: 2
Option 3: 5
Option 4: 9
Correct Answer: 7
Solution : Given: $(\sin \theta+\operatorname{cosec} \theta)^2+(\cos \theta+\sec \theta)^2=k+\tan ^2 \theta+\cot ^2 \theta$ ⇒ $\sin^{2}θ + 2\sinθ\operatorname{cosec}θ + \operatorname{cosec}^{2}θ +\cos^{2}θ + 2\cos θ \secθ + \sec^{2}θ=k+\tan ^2 \theta+\cot ^2 \theta$ ⇒ $k = \sin^{2}θ + \operatorname{cosec}^{2}θ + \cos^{2}θ+\sec^{2}θ + 2(1+1) - \tan ^2 \theta-\cot ^2 \theta$ ⇒ $k
Question : The following table shows the production of different types of two-wheelers from 1993 to 1998. Number of two-wheelers (in 1000s)
What is the percentage increase in the total production of all types of two-wheelers in 1998 in comparison to 1996 (rounded off to the nearest integer)?
Option 1: 27%
Option 2: 25%
Option 3: 24%
Option 4: 26%
Correct Answer: 25%
Solution : Percentage increase in the total production of all types of two-wheelers in 1998 in comparison to 1996 = $\frac{334-268}{268}×100$ = 24.63% $\approx$ 25% Hence, the correct answer is 25%.
Question : Select the correct active form of the given sentence. Her wooden almirah has been destroyed by the termites.
Option 1: The termites destroyed her wooden almirah.
Option 2: The termites could destroy her wooden almirah.
Option 3: The termites had destroyed her wooden almirah.
Option 4: The termites have destroyed her wooden almirah.
Correct Answer: The termites have destroyed her wooden almirah.
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
Question : Ram can copy 60 pages in 15 hours. If Ram and Riya together can copy 180 pages in 30 hours, in how many hours can Riya copy 20 pages?
Option 1: 29 hours
Option 2: 12 hours
Option 3: 20 hours
Option 4: 10 hours
Correct Answer: 10 hours
Solution : Given: Ram can copy 60 pages in 15 hours. Total pages = Pages per hour × Time Ram's rate is $\frac{60}{15} = 4$ pages per hour. Together, Ram and Riya can copy 180 pages in 30 hours. So, their combined rate (Ram + Riya)
Question :
Directions: In the following question, select the related word from the given alternatives. Earth : Planet :: Moon : ?
Option 1: Sun
Option 2: Universe
Option 3: Venus
Option 4: Satellite
Correct Answer: Satellite
Solution : Given: Earth : Planet :: Moon : ?
The Earth is categorised as one of the planets of our solar system. Similarly, the Moon is categorised as the satellite of Earth.
Hence, the fourth option is correct.
Question : Comprehension:
Read the passage and answer the questions that follow.
Cambridge was my metaphor for England, and it was strange that when I left it had become altogether something else because I had met Stephen Hawking there. It was on a walking tour through Cambridge that the guide mentioned Stephen Hawking, ‘poor man, who is quite disabled now, though he is a worthy successor to Isaac Newton, whose chair he has at the university.’ And I started because I had quite forgotten that this most brilliant and completely paralyzed astrophysicist, (scholar of astrophysics — a branch of physics dealing with stars, planets, etc.) the author of A Brief History of Time, one of the biggest best-sellers ever, lived here. When the walking tour was done, I rushed to a phone booth and, almost tearing the cord so it could reach me outside, phoned Stephen Hawking’s house. There was his assistant on the line and I told him I had come in a wheelchair from India (perhaps he thought I had propelled myself all the way) to write about my travels in Britain. I had to see Professor Hawking — even ten minutes would do. “Half an hour,” he said. “From three-thirty to four.”And suddenly I felt weak all over. Growing up disabled, you get fed up with people asking you to be brave as if you have a courage account on which you are too lazy to draw a cheque. The only thing that makes you stronger is seeing somebody like you, achieving something huge. Then you know how much is possible and you reach out further than you ever thought you could. “I haven’t been brave,” said his disembodied computer-voice, the next afternoon.“I’ve had no choice.” Surely, I wanted to say, living creatively with the reality of his disintegrating body was a choice? But I kept quiet because I felt guilty every time I spoke to him, forcing him to respond. There he was, tapping at the little switch in his hand, trying to find the words on his computer with the only bit of movement left to him, his long, pale fingers. Every so often, his eyes would shut in frustrated exhaustion. And sitting opposite him I could feel his anguish, the mind buoyant with thoughts that came out in frozen phrases and sentences stiff as corpses.
Question:
The narrator pulled the telephone cord outside the phone booth because he was:
Option 1: not able to hear clearly in the booth
Option 2: desperate to get an appointment with Stephen Hawking
Option 3: unable to enter the booth on a wheelchair
Option 4: eager to call Stephen Hawking’s home
Correct Answer: unable to enter the booth on a wheelchair
Solution : The correct choice is the third option.
Explanation: The reason for this choice is indicated in the passage where the narrator mentions, "I rushed to a phone booth, almost tearing the cord so it could reach me outside."
Question : The diagonal of the square is $8 \sqrt{2}$ cm. Find the diagonal of another square whose area is triple that of the first square.
Option 1: $8 \sqrt{5}$ cm
Option 2: $8 \sqrt{3}$ cm
Option 3: $8 \sqrt{2}$ cm
Option 4: $8 \sqrt{6}$ cm
Correct Answer: $8 \sqrt{6}$ cm
Solution : Given, Diagonal = $8\sqrt2$ $\therefore$ Side = $\frac{8\sqrt{2}}{\sqrt 2}=8$ cm ⇒ Area of this square = $(8)^2 = 64$ cm2 The Area of the Second square is triple the first one. ⇒ Area of the second one $= 64×3$ $\therefore$ Side of
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