SSC CGL Undated PYQs

Question 1

In the following question, select the odd letter from the given alternatives.

Accepted Answer

The positional values of the letters in the English alphabet are B=2, N=14, P=16, and W=23. Except W, all other letters have even positional values.

Question 2

Which of the following bonds are weakest in nature?

Accepted Answer

Hydrogen bonds are intermolecular forces, which are significantly weaker than intramolecular covalent bonds (single, double, and triple bonds) that hold atoms together within a molecule.

Question 3

In the following question, select the related number pair from the given alternatives. 534 : 2 : : ? : ? 534 : 2 : : ? : ?

Accepted Answer

The logic is (first digit + second digit) ÷ third digit = second number. For 534, (5+3)÷4 = 2. Similarly, for 999, (9+9)÷9 = 2.

Question 4

Correct the following equation by interchanging the two signs and two numbers. 7 x 6 + 5 – 4 = 33 7 x 6 + 5 – 4 = 33

Accepted Answer

By interchanging + and -, and 5 and 6, the equation becomes 7 x 5 - 6 + 4. Solving this gives 35 - 6 + 4 = 33, which matches the RHS.

Question 5

Which of the following pair is incorrect? ?

Accepted Answer

Nandlal Bose was a pioneer of modern Indian art and a famous painter, not a flute player. The other three pairs correctly match the artists with their fields.

Question 6

The number of trees in a town is 17640. If the numbers of trees increases annually at the rate of 5%, then how many trees were there 2 years ago?

Accepted Answer

Let the trees 2 years ago be P. With 5% annual growth, P × (105/100)² = 17640. P × (21/20)² = 17640. P = 17640 × (400/441) = 16000.

Question 7

Which of the following pair is CORRECT? I. Summer Olympics 2020 - Tokyo II. Summer Olympics 2016 - Rio de Janeiro III. Summer Olympics 2012 - London 07/09/2017 Staﬀ Selection Commision http://thepracticetest.in/cs_cglet1_17/response_questions.php?t_id=MTEwODIwMTc=&appid=1368062d74107fc05177712c90… 16/27

Accepted Answer

All three pairs are correct. The Summer Olympics were hosted by London in 2012, Rio de Janeiro in 2016, and Tokyo in 2020.

Question 8

Which of the following causes fly ash? ?

Accepted Answer

Fly ash is a fine powder produced as a byproduct of burning pulverized coal in electric generation power plants. Therefore, coal combustion power plants are the primary source.

Question 9

Which of the following is an ore of Aluminium?

Accepted Answer

Cryolite (Na3AlF6) is an important ore of aluminium, used in its electrolytic extraction. Galena is an ore of lead, and cinnabar is an ore of mercury.

Question 10

If a(a + b + c) = 45, b(a + b + c) = 75 and c(a + b + c) = 105, then what is the value of (a2 + b2 + c2)?

Accepted Answer

Add the three equations: (a+b+c)^2 = 45+75+105 = 225, so a+b+c = 15. Then a=3, b=5, c=7. Thus, a^2+b^2+c^2 = 9+25+49 = 83.

Question 11

Ozone is an ______ of oxygen.

Accepted Answer

Ozone (O3) and dioxygen (O2) are allotropes of oxygen because they are different structural forms of the same element existing in the same physical state.

Question 12

How much water (in litres) must be added to 80 litres solution of milk and water containing 10% milk, so that it becomes a 5% milk solution?

Accepted Answer

Initial milk is 10% of 80L = 8L. To make this 8L equal to 5% of the new mixture, the total volume must be 160L. Thus, 160 - 80 = 80L of water must be added.

Question 13

The SI unit of acceleration is _______________.

Accepted Answer

Acceleration is the rate of change of velocity. Since velocity is measured in m/s and time in seconds, acceleration is (m/s)/s, which equals meters per second squared.

Question 14

If 4 * 5 % 3 = 8000 and 2 * 3 % 2 = 36, then 4 * 3 % 3 = ? 4 * 3 % 3 = ?

Accepted Answer

The pattern is (a * b)^c. For 4 * 5 % 3, (4*5)^3 = 20^3 = 8000. Applying this to 4 * 3 % 3 gives (4*3)^3 = 12^3 = 1728.

Question 15

In Indian constitution, the method of election of President has been taken from which country?

Accepted Answer

The method of election of the President, Directive Principles of State Policy (DPSP), and nomination of members to Rajya Sabha are borrowed from the Irish Constitution.

Question 16

If cos2 θ – sin θ = ¼, then what is the value of sin θ?

Accepted Answer

Substitute cos² θ = 1 - sin² θ. The equation becomes 1 - sin² θ - sin θ = 1/4, which simplifies to 4sin² θ + 4sin θ - 3 = 0. Solving gives sin θ = 1/2.

Question 17

The coil wire in the electric room heater or electric cooking heater is called __________.

Accepted Answer

The heating coil in appliances like room heaters and geysers is called a heating element. It converts electrical energy into heat due to its high resistance.

Question 18

A healthy adult man has, on an average, ________ (in millions) of RBCs mm-3 of blood.

Accepted Answer

A healthy adult male typically has an RBC count ranging from 5 to 5.5 million per cubic millimeter of blood. This is essential for adequate oxygen transport throughout the body.

Question 19

Takshashila University was located between which two rivers?

Accepted Answer

Takshashila (Taxila) was a renowned ancient university located in the northwestern region of the Indian subcontinent, situated precisely between the Indus and Jhelum rivers in present-day Pakistan.

Question 20

An economic system combining private and state enterprise is called as _____

Accepted Answer

A mixed economy incorporates elements of both capitalism (private enterprise) and socialism (state/government control) to balance economic freedom with social welfare.