Staff Selection Commission Sub Inspector Exam
Question : Study the given graph and answer the question that follows. What is the ratio of the number of workers in the company whose age is 28 years or more but less than 40 years to the number of workers whose age is 40 years or more but less than 52 years?
Option 1: 10 : 7
Option 2: 23 : 21
Option 3: 9 : 8
Option 4: 7 : 6
Correct Answer: 7 : 6
Solution : As per the given graph, The number of workers whose age is 28 years or more but less than 40 years = 90 + 85 + 70 = 245 The number of workers whose age is 40 years or more but less than
Question : The ratio of the two numbers is 4 : 5, and their HCF is 3. What is their LCM?
Option 1: 48
Option 2: 80
Option 3: 60
Option 4: 36
Correct Answer: 60
Solution : The ratio of the two numbers is 4 : 5. Let the numbers be 4$x$, 5$x$. Their HCF = $x$ as 4, 5 are coprime. So, $x$ = 3 Numbers are 4 × 3 = 12, 5 × 3 = 15 We know the product
Question : Which of the following water bodies is closest to the Palk Strait?
Option 1: Mahim Creek
Option 2: Gulf of Mannar
Option 3: Gulf of Khambhat
Option 4: Chilika Lake
Correct Answer: Gulf of Mannar
Solution : The correct answer is the Gulf of Mannar.
The Palk Strait serves as a significant waterway separating the southeastern coast of India, particularly Tamil Nadu, from the northern coast of Sri Lanka, near Jaffna. Close to Mannar Island, Sri Lanka, lies the
Question : Directions: In the following question a series is given, with one number missing. Select the missing number from the given series. 2, 7, 22, 67, ?
Option 1: 197
Option 2: 198
Option 3: 200
Option 4: 202
Correct Answer: 202
Solution : Given: 2, 7, 22, 67, ?
Multiply the difference of two consecutive terms by 3 and add the resultant to the next term, to get the missing term of the series – 2 + 5 = 7 7 + (5 × 3) = 7 +
Question : EEG records the activity of:
Option 1: heart
Option 2: lungs
Option 3: brain
Option 4: muscles
Correct Answer: brain
Solution : The correct option is the brain.
EEG (Electroencephalography) measures voltage fluctuations caused by the collective firing of neurons to record the electrical activity of the brain. These electrical changes are detected and recorded as waveforms by EEG electrodes implanted on the scalp.
Question : Match the gases in column I with their odour in column II.
Option 1: A – 1, B – 2, C – 3
Option 2: A – 2, B – 1, C – 3
Option 3: A – 2, B – 3, C – 1
Option 4: A – 3, B – 1, C – 2
Correct Answer: A – 2, B – 1, C – 3
Solution : The correct option is A – 2, B – 1, C – 3.
Carbon dioxide (CO2) is a colourless, odourless gas. Hydrogen sulphide (H2S) is a colourless gas with the smell of
Question : A car covers a particular distance in 3 hours with a speed of 54 km/hr. If the speed is increased by 27 km/hr, the time taken by the car to cover the same distance will be:
Option 1: $2 \mathrm{~hours}$
Option 2: $1 \mathrm{~hour}$
Option 3: $2 \frac{1}{2} \mathrm{~hours}$
Option 4: $1 \frac{1}{2} \mathrm{~hours}$
Correct Answer: $2 \mathrm{~hours}$
Solution : Given: A car covers a particular distance in 3 hours with a speed of 54 km/hr. The total distance = speed × time = (54 × 3) = 162 km Now, the speed is increased by 27 km/hr, So, the new speed = (54
Question : Directions: Govind is 48 years old. He is twice as old as his son Prem, is now. How old was Prem seven years ago?
Option 1: 16
Option 2: 17
Option 3: 13
Option 4: 18
Correct Answer: 17
Solution : Given: Age of Govind = 48 years old.
Let, the present age of Prem = X years And, the present age of Govind = 2X years According to the given question, ⇒ 2X = 48, ⇒ X = 48 ÷ 2 = 24 years
So,
Question : Find the LCM of $\frac{3}{2}, \frac{81}{16}$ and $\frac{9}{8}$
Option 1: $\frac{91}{2}$
Option 2: $\frac{81}{2}$
Option 3: $\frac{111}{2}$
Option 4: $\frac{101}{2}$
Correct Answer: $\frac{81}{2}$
Solution : Given fractions = $\frac{3}{2}, \frac{81}{16}$ and $\frac{9}{8}$ We know that, LCM of a fraction = $\frac{\text{LCM of the numerators}}{\text{HCF of the denominators}}$ LCM of 3, 81, 9 is 81. HCF of 2, 16 and 8 is 2. $\therefore$ LCM of $\frac{3}{2}, \frac{81}{16}$ and $\frac{9}{8}$ =
Question : A pump can fill a tank with water in 1 hour. Because of a leak, it took $1 \frac{1}{3}$ hours to fill the tank. In how many hours can the leak alone drain all the water in the tank when it is full?
Option 1: 5
Option 2: 1
Option 3: 2
Option 4: 4
Correct Answer: 4
Solution : Time taken by the pump to fill the tank = 1 hour Part of the tank filled by a pump in an hour = 1 Let $x$ be the time taken by the leak alone to drain the tank. Part of tank drained by the
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