SSC CGL Undated PYQs

Question 1

Which country has banned 'Facebook' ?

Accepted Answer

China banned Facebook in 2009 following the Ürümqi riots to control information flow. They use domestic alternatives like WeChat and Weibo instead.

Question 2

The marginal product curve is inverse ____ shaped.

Accepted Answer

The marginal product curve initially rises, reaches a maximum, and then falls due to the law of diminishing returns, forming an inverse 'U' shape.

Question 3

If sec (3x – 20°) = cosec (3y + 20°), then what is the value of tan (x + y)?

Accepted Answer

Since sec A = cosec B implies A + B = 90°, we get 3x - 20° + 3y + 20° = 90°. This gives 3(x + y) = 90°, so x + y = 30°. Thus, tan(30°) = 1/√3.

Question 4

Anil is twice as good as workman as Bimal and together they ﬁnish a piece of work in 9 days. In how many days will Anil alone ﬁnish the work?

Accepted Answer

Anil's efficiency is 2, Bimal's is 1. Total efficiency = 3. Total work = 3 × 9 = 27 units. Time taken by Anil alone = 27 / 2 = 13.5 days.

Question 5

A bus travels 2/5 of a total journey at its usual speed. The remaining distance was covered by bus at 6/7 of its usual speed. Due to slow speed it reaches its destination 50 minutes late. If the total distance is 200 kms, then what is the usual speed (in km/hr) of bus?

Accepted Answer

Remaining distance is 120 km. The time difference is 120/(6v/7) - 120/v = 20/v hours. Equating this to 50/60 hours gives 20/v = 5/6, so v = 24 km/hr.

Question 6

Which one among the following is a main system board of a computer?

Accepted Answer

The motherboard is the main printed circuit board in a computer. It connects and allows communication between all crucial electronic components, such as the CPU and memory.

Question 7

The average weight of 100 students is 32 kg. The average weight of first 49 students is 30 kg and of last 50 students is 34 kg. What is the weight (in kg) of the 50th student?

Accepted Answer

Total weight = 100 × 32 = 3200 kg. Weight of 99 students = (49 × 30) + (50 × 34) = 1470 + 1700 = 3170 kg. 50th student = 3200 - 3170 = 30 kg.

Question 8

Improve the bracketed part of the sentence. I (didn't see) him since we met two years ago.

Accepted Answer

The phrase 'since we met two years ago' indicates an action that started in the past and continues to the present. This requires the present perfect tense, 'have not seen'.

Question 9

Arrange the given words in the sequence in which they occur in the dictionary. 1. Train 2. Topper 3. Tingling 4. Tumbler 5. Traction 1. Train 2. Topper 3. Tingling 4. Tumbler 5. Traction

Accepted Answer

Comparing the letters alphabetically: 'Ti' (3) comes first, followed by 'To' (2). For 'Tr', 'Traction' (5) precedes 'Train' (1). Lastly, 'Tu' (4). The correct order is 3, 2, 5, 1, 4.

Question 10

The short run average cost curve is ____ shaped.

Accepted Answer

The short-run average cost curve is U-shaped due to the law of variable proportions. Costs initially fall with increased production, reach a minimum, and then rise.

Question 11

Number of employees in company E are lower than those of company B by:

Accepted Answer

To find the percentage by which E is lower than B, use the formula: [(B - E) / B] × 100. Based on the given data, the difference is 80% of B.

Question 12

What is the area (in sq cm) of an equilateral triangle of side 6 cm?

Accepted Answer

The area of an equilateral triangle is given by the formula (√3/4) × a². Substituting a = 6, we get (√3/4) × 36 = 9√3 sq cm.

Question 13

The difference between compound interest and simple interest on a sum for 2 year at 20% per annum is Rs 200. If the interest is compounded half yearly, then what is the difference (in Rs) between compound and simple interest for 1st year?

Accepted Answer

Difference for 2 years is P(R/100)² = 200, so P(0.2)² = 200, giving P = 5000. For 1 year half-yearly, rate is 10% and periods = 2. Difference = 5000(0.1)² = 50.

Question 14

What is the unit of calorific value?

Accepted Answer

Calorific value measures the heat energy produced by the complete combustion of a unit mass of fuel. Energy is in kilojoules (kJ) and mass in kilograms (kg), making it kJ/kg.

Question 15

Who wrote 'Akbarnama'?

Accepted Answer

'Akbarnama', the official chronicle of the reign of Akbar, was written by his court historian Abul Fazal in Persian. It also includes the famous 'Ain-i-Akbari'.

Question 16

UV rays coming from Sun, majorly causes which cancer?

Accepted Answer

UV rays from the sun penetrate the skin and damage the DNA in skin cells, leading to mutations that primarily cause skin cancer like melanoma.

Question 17

If (3)2 @ 1 * 7 = 98 and  (4)2 @ 2 * 16 = 178, then (5)2 @ 3 * 9 = ?

Accepted Answer

The pattern is: (A)² concatenated with B, then add C. For (5)2 @ 3 * 9: 5² = 25, concatenated with 3 gives 253. 253 + 9 = 262.

Question 18

If 10$25 = 8, 12$25 = 10 then what is the value of 14$53 = ?

Accepted Answer

The pattern is the sum of all individual digits. For 14$53, the sum is 1 + 4 + 5 + 3 = 13.

Question 19

Uranium found in Ladakh is an example of which type of resource?

Accepted Answer

Potential resources are those whose entire quantity may not be known and are not being used at present, but could be used in the future. Ladakh's uranium fits this definition.

Question 20

The method of soil conservation in which bare ground between plants is covered with layer of organic matter like straw is called?

Accepted Answer

Mulching involves covering the bare soil between plants with organic matter like straw to retain soil moisture, regulate temperature, and prevent soil erosion.