Staff Selection Commission Combined Higher Secondary Level Exam
Question : The lightest radioactive element is
Option 1: Deuterium
Option 2: Polonium
Option 3: Tritium
Option 4: Uranium
Correct Answer: Tritium
Solution : The correct option is Tritium.
The lightest radioactive element is tritium (hydrogen-3 or 3H). It is a radioactive hydrogen isotope with a half-life of roughly 12.3 years. Tritium is utilised in a variety of applications, including nuclear research, radioluminescent devices, and scientific investigations as a
Question : Directions: In the following question, some parts of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If the sentence is free from error, select "No Error".
As it came to a stop (1) / the conductor called (2) / over in a loud voice. (3) / No Error (4)
Option 1: (1)
Option 2: (2)
Option 3: (3)
Option 4: (4)
Correct Answer: (3)
Solution : The correct answer is the third option.
"Call out" means to shout whereas "call over" means to read out a list. "Call out" is contextually correct in the sentence. There is an error in the use of the proper phrasal verb in the sentence.
Therefore,
Question : Select the option that expresses the given sentence in passive voice. The Governor of the state inaugurated the exhibition in a grand way.
Option 1: The exhibition had been inaugurated by the Governor of the state in a grand way.
Option 2: The exhibition inaugurated by the Governor of the state in a grand way.
Option 3: The exhibition has been inaugurated by the Governor of the state in a grand way.
Option 4: The exhibition was inaugurated by the Governor of the state in a grand way.
Correct Answer: The exhibition was inaugurated by the Governor of the state in a grand way.
Solution : The fourth option is the correct choice.
Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the
Question : Which of the following statements is correct regarding air pressure?
Option 1: High pressure is associated with cloudy skies and wet weather.
Option 2: Low pressure is associated with clear and sunny skies.
Option 3: The air always moves from high-pressure areas to low-pressure areas.
Option 4: The air pressure is lowest at sea level and increases with height.
Correct Answer: The air always moves from high-pressure areas to low-pressure areas.
Solution : The correct option is The air always moves from high-pressure areas to low-pressure areas.
It is generally true that air moves from high-pressure areas to low-pressure areas. This movement is a response to pressure differences in
Question : Directions: Words given on the left side of (::) are related to each other by some Logic/Rule/Relation. Select the missing word/word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation. Thailand : Baht :: China : ?
Option 1: Riyal
Option 2: Dinar
Option 3: Yuan
Option 4: Dollar
Correct Answer: Yuan
Solution : Given: Thailand : Baht :: China : ?
Like, Baht is the official currency of Thailand. Similarly, the official currency of China is the Yuan.
Hence, the third option is correct.
Question : Directions: What should come in place of (?) in the given series? 12, 15, 20, 27, 38, ?
Option 1: 52
Option 2: 47
Option 3: 51
Option 4: 49
Correct Answer: 51
Solution : Given: 12, 15, 20, 27, 38, ?
Add the consecutive prime numbers (starting from 3) to the previous term to obtain the next term. 12 + 3 = 15; 15 + 5 = 20; 20 + 7 = 27; 27 + 11 = 38; 38
Question : Directions: Read the given statements and conclusions carefully. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. You have to decide which of the conclusions logically and definitely follows from the given statements. Statements: I. All Eagles are Predators. II. All Tigers are Predators. III. Some Tigers are Cats. Conclusions: I. All Cats are Predators. II. All Eagles are Tigers.
Option 1: Both conclusions (I) and (II) do not follow
Option 2: Only conclusion (I) follows
Option 3: Only conclusion (II) follows
Option 4: Both conclusions (I) and (II) follow
Correct Answer: Both conclusions (I) and (II) do not follow
Solution : The possible Venn diagram, according to the given statements is as follows –
Let's analyse the conclusions – Conclusion I: All Cats are Predators – It is a possibility that a circle representing cats comes under the
Question : If a train 130 m long takes $6 \frac{1}{2}$ seconds to cross a man who is walking at 12 km/hr in the same direction in which the train going, then the speed of the train (in km/hr) is:
Option 1: 84
Option 2: 64
Option 3: 48
Option 4: 74
Correct Answer: 84
Solution : Man's speed in m/s = $12\text{ km/hr} \times \frac{5}{18} = 12 \times \frac{5}{18}\ \mathrm{ m/s} = \frac{10}{3}\text{ m/s}$ We know that the train crosses a 130-meter-long man in $\frac{13}{2}$ seconds. $\therefore$ Relative speed = $\frac{130\ \mathrm{m}}{\frac{13}{2}\mathrm{s}} = 20\text{ m/s}$ Relative speed = (Train's speed in
Question : “Advanced Light Helicopter (ALH) MK III” has been manufactured by which organisation?
Option 1: The Indian Space Research Organisation
Option 2: Hindustan Aeronautics Limited
Option 3: The Defence Research and Development Organisation
Option 4: Bharat Heavy Electricals Limited
Correct Answer: Hindustan Aeronautics Limited
Solution : The correct option is Hindustan Aeronautics Limited.
The "Advanced Light Helicopter (ALH) MK III" has been manufactured by Hindustan Aeronautics Limited (HAL), an Indian state-owned aerospace and defence company. Renowned for its versatility, the ALH MK III serves various roles, including search and
Question : The angle subtended by an arc at the circumference of the circle is 55°. Find the angle subtended by it at the centre.
Option 1: 35°
Option 2: 110°
Option 3: 125°
Option 4: 27.5°
Correct Answer: 110°
Solution : The angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle. Let O, R, and PQ be the centre, a point on the major arc, and the aforementioned chord respectively.
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