Staff Selection Commission Combined Graduate Level Exam
Question : Which scientist suggested that the magnet must also exert an equal and opposite force on the current-carrying conductor?
Option 1: Michael Faraday
Option 2: André-Marie Ampère
Option 3: Joseph Henry
Option 4: William Gilbert
Correct Answer: André-Marie Ampère
Solution : The correct answer is André-Marie Ampère.
André-Marie Ampère, a French scientist, proposed that a magnet should exert an equal and opposite force on a current-carrying conductor. A wire carrying current has its magnetic field. A current-carrying wire like a regular bar magnet, attracts a
Question : Two friends, P and Q, start running around a circular track from the same point. They run in the same direction. P runs at 6 m/sec and Q runs at b m/sec. If they cross each other at exactly two points on the circular track and b is a natural number less than 6, how many values can b take?
Option 1: 2
Option 2: 1
Option 3: 4
Option 4: 3
Correct Answer: 1
Solution : If the ratio of their speeds is $V_1:V_2$, the distinct meeting points will be $V_1-V_2$, with both are running in the same direction. Try different values of $b$ from 1 to 5 and check which satisfies $V_1-V_2 = 2$ $\frac{V_1}{V_2}=\frac{6}{b}$; number of points is 2
Question : In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Our beautiful ecosystem is being systematically (1)____ by industrial pollution channelled into rivers like the Ganga and the Yamuna, nuclear wastes from atomic plants muted into the world’s oceans, and (2)____ gases such as carbon dioxide mixed with the ozonosphere. Besides, tropical rainforests and green pastures are disappearing (3)_____ the pressure of a proliferating population. Dams are being (4)_____ over the rivers like the Narmada to change nature’s well-balanced surface equations between flora and fauna, and sloping mountainous terrain is being converted into mini oceans to supply electricity to the ever-starving industrial stomach of our age. Elephants, tigers, the wild rhinos of South Africa and many other forest creatures have become (5)_____ species.
Question
Select the most appropriate option to fill in the blank number 3.
Option 1: in
Option 2: to
Option 3: on
Option 4: under
Correct Answer: under
Solution : The fourth option is correct.
Explanation: The preposition under is used to indicate a condition or pressure, making it suitable in the context of disappearing tropical rainforests and green pastures. The phrase under pressure suggests that these ecosystems are adversely affected or disappearing due to
Question : A village canal can be cleaned by 24 villagers in 12 days. The number of days in which 36 villagers can clean the canal is:
Option 1: 18
Option 2: 8
Option 3: 72
Option 4: 16
Correct Answer: 8
Solution : Let the work be $x$ and the same for both cases. By using the formula: $\frac{M_1×T_1}{W_1}=\frac{M_2×T_2}{W_2}$ Where $M_1$ and $M_2$ are men, $D_1$ and $D_2$ are days and $W_1$ and $W_2$ are work done. According to the question, $\frac{24×12}{x}=\frac{36×T_2}{x}$ ⇒ $T_2=\frac{24×12}{36}$ ⇒ $T_2=8$ days Hence,
Question : A and B together can do a piece of work in 12 days, while A alone can do the same work in 30 days. B alone can do it in:
Option 1: 18 days
Option 2: 20 days
Option 3: 15 days
Option 4: 22 days
Correct Answer: 20 days
Solution : Given: Time taken by A and B together to complete the work = 12 days ⇒ Part of work done by A and B in a day = $\frac{1}{12}$ Time taken by A alone to complete the work = 30 days ⇒ Part of
Question : Comprehension:
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The child is the father of the man. Childhood is a (1)______ of what one is going to be when one (2)______ maturity. The natural instincts of a man are (3)______ in his childhood. Time modifies them but cannot (4)______ them. History contains numerous examples of great men who gave (5)______ of their future when they were children. A child’s mind is (6)______ and flexible. The mould he receives before his clay (7)______ becomes his permanent mark. The values and standards of (8)______ which will determine his life as a man (9)______ in childhood itself. There may be certain (10)______ of course. A bright morning may end in a storm!
Question:
Select the most appropriate option to fill in the blank no. 7.
Option 1: refines
Option 2: precipitates
Option 3: contracts
Option 4: hardens
Correct Answer: hardens
Solution : The correct choice is the fourth option.
Hardens means to make or become hard or harder. It helps convey the intended meaning that the values a man gets in his childhood become hard and do not go away.
Question : Directions: Three statements are given followed by three conclusions numbered I, II, and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: Some teachers are scientists. All scientists are doctors. All doctors are engineers. Conclusions: I. Some doctors are teachers. II. Some engineers are teachers. III. Some doctors are scientists.
Option 1: Only conclusions I and II follow
Option 2: All conclusions follow
Option 3: Only conclusions I and III follow
Option 4: Only conclusions II and III follow
Correct Answer: All conclusions follow
Solution : The possible Venn diagram according to the given statements is as follows –
Let's analyse the conclusions – Conclusion I: Some doctors are teachers – From the Venn diagram, it is evident that the circles representing teachers and doctors overlap and have a
Question : A person who is colourblind cannot distinguish between
Option 1: Black and yellow
Option 2: Red and green
Option 3: Yellow and white
Option 4: Green and blue
Correct Answer: Red and green
Solution : The correct answer is Red and green.
Colour blindness is a condition in which a person faces difficulty distinguishing certain colours, such as red and green. It is a disorder that affects one's ability to identify the differences between various shades of colour.
Question : Who among the following was the best-known Chahamana ruler?
Option 1: Prithviraja III
Option 2: Vigraharaja II
Option 3: Prithviraja I
Option 4: Vasudeva
Correct Answer: Prithviraja III
Solution : The correct answer is Prithviraja III.
The most well-known Chahamana king was Prithviraja III (1168–1192). He beat Sultan Muhammad Ghori of Afghanistan in 1191 but fell short of him the following year, in 1192.
Question : The growth of Bacteria is measured by which of the following?
Option 1: Hemocytometer
Option 2: Spectrophotometer
Option 3: Calorimeter
Option 4: Auxanometer
Correct Answer: Auxanometer
Solution : The answer is the Auxanometer.
The growth of bacteria is measured by an apparatus known as an auxanometer, which measures the increase in the growth of plants and bacteria. A calorimeter is used to measure the amount of heat involved in a chemical reaction. A
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