SSC CGL Undated PYQs

Question 1

5 years ago the average age of a family which includes father, mother and a son was 35 years. 3 years ago the average age of father and mother was 46 years. What is the present age (in years) of the son?

Accepted Answer

Present sum of all three is 35 × 3 + 15 = 120. Present sum of parents is 46 × 2 + 6 = 98. Son's age is 120 - 98 = 22 years.

Question 2

The method of soil conservation in which ploughing is done parallel to the contours of a hill slope to form a natural barrier for water to flow down the slop is called?

Accepted Answer

Contour ploughing involves tilling along the natural elevation lines of a slope. This creates water breaks, significantly reducing soil erosion caused by surface runoff down the hill.

Question 3

Arnav's birthday is on Tuesday 14th March. On what day of the week will be Pranay's Birthday in the same year if Pranay was born on 13th September?

Accepted Answer

Calculate days from March 14 to Sept 13: 17(Mar) + 30(Apr) + 31(May) + 30(Jun) + 31(Jul) + 31(Aug) + 13(Sep) = 183 days. 183 ÷ 7 leaves 1 odd day. Tuesday + 1 = Wednesday.

Question 4

The members of chlorophyceae are commonly called _________ algae.

Accepted Answer

Chlorophyceae are commonly known as green algae due to the dominance of pigments chlorophyll a and b, which impart a grass-green color.

Question 5

Under which article, President of India can proclaim financial emergency?

Accepted Answer

Article 360 of the Indian Constitution empowers the President to proclaim a Financial Emergency if the financial stability or credit of India is threatened.

Question 6

For a price taking firm, average revenue is ______ market price.

Accepted Answer

A price-taking firm operates in perfect competition, selling all units at the same market price. Since Total Revenue = Price × Quantity, the Average Revenue (TR/Q) is exactly equal to the market price.

Question 7

The__________ are the primary female sex organs that produce the female gamete (ovum) and several steroid hormones (ovarian hormones).

Accepted Answer

Ovaries are the primary female reproductive organs responsible for producing ova (eggs) and secreting key steroid hormones like estrogen and progesterone, which regulate the menstrual cycle.

Question 8

For how many days did Mahatma Gandhi's volunteers of the Salt satyagrah walked?

Accepted Answer

The Salt Satyagraha, or Dandi March, started on March 12, 1930, and ended on April 6, 1930. The volunteers walked for exactly 24 days to cover the 240-mile journey.

Question 9

Which Vitamin is obtained from Sun rays? ?

Accepted Answer

Vitamin D is synthesized in the skin when exposed to sunlight, specifically UVB rays. It helps the body absorb calcium, promoting healthy bones and teeth.

Question 10

If 8x/3 + [7(5 - 2x/3)]/2 = 1/2 , then what is the value of x?

Accepted Answer

Multiply the entire equation by 6 to eliminate fractions. This gives 16x + 105 - 14x = 3. Simplifying yields 2x = -102, so x = -51.

Question 11

In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), what does the three names, indica, tuberosum and leo, represent?

Accepted Answer

In binomial nomenclature, a scientific name has two parts. The first is the genus, and the second word (indica, tuberosum, leo) is the specific epithet denoting the species.

Question 12

The boundary between Earth's crust and mantle is _____.

Accepted Answer

The Mohorovičić (Moho) discontinuity is the boundary that separates the Earth's crust from the underlying mantle. Gutenberg separates the mantle and core.

Question 13

A can complete a work in 20 days and B can complete the same work in 25 days. If both of them work together, then in 3 days what percent of the total work will be completed?

Accepted Answer

Let total work be LCM(20, 25) = 100 units. A's efficiency is 5, B's is 4. Together they do 9 units/day. In 3 days, they complete 27 units, which is 27%.

Question 14

___________ is the process of restoring a forest that once existed but was removed at some point of time in the past.

Accepted Answer

Reforestation is the replanting of trees in an area where a forest was previously depleted or destroyed, helping to restore the natural ecosystem.

Question 15

To whom the Nobel Prize in Physiology or Medicine 2016 was awarded?

Accepted Answer

Yoshinori Ohsumi was awarded the 2016 Nobel Prize in Physiology or Medicine for his discoveries of mechanisms for autophagy, the fundamental process for degrading and recycling cellular components.

Question 16

Union Cabinet approves amendments in M-SIPS to attract investment in electronics manufacturing. What is the full form of M-SIPS?

Accepted Answer

M-SIPS stands for Modified Special Incentive Package Scheme. It was launched by the Indian government to promote large-scale electronics manufacturing by providing financial incentives to attract investments.

Question 17

If a3 + b3 = 28 and a + b = 4, then what is the value of ab?

Accepted Answer

Use the formula a³ + b³ = (a+b)((a+b)² - 3ab). Substituting the values gives 28 = 4(16 - 3ab). Solving this yields 7 = 16 - 3ab, so 3ab = 9, which means ab = 3.

Question 18

A non-zero number is greater than 7 times its reciprocal by 9.3. What is the number?

Accepted Answer

Let the number be x. The equation is x - 7/x = 9.3. Testing option 1 (x=10) gives 10 - 7/10 = 10 - 0.7 = 9.3, which satisfies the condition.

Question 19

What was invented by J. B. Dunlop?

Accepted Answer

John Boyd Dunlop, a Scottish inventor, is credited with inventing the first practical pneumatic (inflatable) rubber tyre in 1887, originally for his son's tricycle.

Question 20

If BOULDER is coded as ZMSJBCP, then how will ELK be coded as?

Accepted Answer

Each letter in the word is shifted backward by 2 positions in the English alphabet. Applying -2 to E, L, and K gives C, J, and I respectively.