Staff Selection Commission Combined Higher Secondary Level Exam
Question : The harmful substances produced by the microbes are known as:
Option 1: antibiotics
Option 2: pollutants
Option 3: hormones
Option 4: toxins
Correct Answer: toxins
Solution : The correct answer is toxins.
The microbial toxin is a harmful substance produced by microorganisms which negatively impacts the human immune system. These are produced by microorganisms like bacteria, fungi, protozoa, dinoflagellates, etc. It is of two types: endotoxins and exotoxins. Endotoxins are generated
Question : The average age of 24 students is 12 years. It was observed that while calculating the average age, the age of a student was taken as 14 years instead of 8 years. What will be the correct average age (in years)?
Option 1: 11.25
Option 2: 11.5
Option 3: 11.75
Option 4: 12.25
Correct Answer: 11.75
Solution : Given: The average age of 24 students is 12 years. The sum of the age of 24 students = 24 × 12 = 288 The age of a student was taken as 14 years instead of 8 years. So, corrected average = $\frac{(288–14+8)}{24}$ = $\frac{282}{24}$
Question : Comprehension: In the following passage, some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each number.
There were other stories (1) _______ Krishna. How (2) _______ been born in a dungeon where his uncle Kamsa had imprisoned his parents with the intention of killing him at birth. How, in spite of the many prison guards, he had been miraculously spirited (3) ______ to safety in Gokul. How, in infancy, he killed a (4) _______ who tried to poison him with her breast milk. How he lifted up Mount Govardhan to shelter his people from a (5) _______ that would have drowned them.
Question: Select the most appropriate option to fill in the blank No. (2).
Option 1: he have
Option 2: he was
Option 3: he has
Option 4: he had
Correct Answer: he had
Solution : The correct answer is the fourth option.
The sentence is structured to describe the circumstances of Krishna's birth, particularly emphasising the conditions in which he was born.
Therefore, the correct sentence is, "How he had been born in a dungeon where his uncle Kamsa
Question : Tangent drawn from point X touches the circle at U. O is the centre of this circle. If XU = 15 cm and OU = 8 cm, then what is the value of OX?
Option 1: 12 cm
Option 2: 19 cm
Option 3: 21 cm
Option 4: 17 cm
Correct Answer: 17 cm
Solution : The radius and tangent of a circle at a point of contact is always perpendicular to each other. So the angle is 90º. According to the concept, Since $\angle$OUX is 90°, $\triangle$XUO is a right-angled triangle at U. OX is the hypotenuse. Now, $OX
Question : Directions: In the following question, a series is given with one number missing. Select the missing number from the given alternatives. 49, 46, 43, 40, ?, 34
Option 1: 38
Option 2: 37
Option 3: 36
Option 4: 39
Correct Answer: 37
Solution : Given: 49, 46, 43, 40, ?, 34
Here, subtract 3 from the previous number to get the next number. 49 – 3 = 46; 46 – 3 = 43; 43 – 3 = 40; 40 – 3 = 37; 37 – 3 = 34
37
Question : Select the most appropriate homonym in the context of the following sentence to fill in the blank. The key was hanging on a_____by the door.
Option 1: nail: to catch someone, especially when they are doing something wrong, or guilty
Option 2: nail: a small metal spike, driven into wood to join things together or to serve as a hook
Option 3: nail: a thin, hard area that covers the upper side of the end of each finger and each toe
Option 4: nail: to do something successfully
Correct Answer: nail: a small metal spike, driven into wood to join things together or to serve as a hook
Solution : The correct choice is the second option.
"Nail: a small metal spike, driven into the wood to join things together or to serve as a hook" - This
Question : Directions: In a certain code language, A + B means A is the mother of B, A – B means A is the brother of B, A × B means A is the wife of B, A ÷ B means A is the father of B. Based on the above, how is S related to U if Q × R – S ÷ T + U?
Option 1: Daughter
Option 2: Brother's wife
Option 3: Mother's father
Option 4: Mother's husband
Correct Answer: Mother's father
Solution : Given: A + B means A is the mother of B; A – B means A is the brother of B; A × B means A is the wife of B; A ÷ B means A is the father of B;
As per the
Question : How much time (in minutes) will Nikhil take to cover 600 m, if he runs at a speed of 24 km/hr?
Option 1: 1.0
Option 2: 1.5
Option 3: 2.0
Option 4: 2.5
Correct Answer: 1.5
Solution : Given, Distance = 600 m = 0.6 km Speed = 24 km/hr ⇒ Time = $\frac{\text{Distance}}{\text{Time}}$ ⇒ Time = $\frac{0.6}{24}$ = 0.025 hours ⇒ Time = 0.025 × 60 minutes = 1.5 minutes Hence, the correct answer is 1.5.
Question : Directions: In the following question, which one set of letters/numbers when sequentially placed at the gaps in the given letter series shall complete it? oopqop_qoo_qo_oqo_pq
Option 1: oppo
Option 2: popo
Option 3: opop
Option 4: poop
Correct Answer: oppo
Solution : Given: oopqop_qoo_qo_oqo_pq
To fill the series we have to divide the series – oopq / op_q / oo_q / o _ oq / o _ pq Let's check the options – First option: oppo; oopq / opoq / oopq / o
Question : Match correctly the infectious agents in List I with the diseases caused by them given in List II:
Option 1: a-1, b-2, c-4, d-3
Option 2: a-2, b-4, c-1, d-3
Option 3: a-3, b-1, c-2, d-4
Option 4: a-4, b-2, c-3, d-1
Correct Answer: a-2, b-4, c-1, d-3
Solution : The correct answer is a-2, b-4, c-1, d-3.
The following diseases are caused by:
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