SSC JE Civil flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Nominal mix M15

Concrete mix proportion 1:2:4 (cement : fine aggregate : coarse aggregate by volume), giving characteristic compressive strength of 15 N/mm² at 28 days; used for mild exposure and non-structural work.

Slump test purpose

Workability test per IS 1199 measuring vertical settlement of fresh concrete in a standard cone; true slump of 25-100 mm is typical for normal RCC placement.

Water-cement ratio limit

IS 456 caps w/c at 0.45 for severe exposure and 0.40 for very severe or extreme exposure; lower w/c raises strength and durability but reduces workability.

Dry unit weight formula

γ_d = γ/(1 + w), where γ is bulk unit weight and w is water content expressed as a decimal; used to compare field compaction against laboratory MDD.

Relative density of soil

I_D = (e_max − e)/(e_max − e_min) × 100, where e is the natural void ratio; expressed as a percentage, it indicates whether sand is loose, medium, or dense.

Manning's equation

Open-channel velocity V = (1/n) R^(2/3) S^(1/2), where n is roughness coefficient, R = A/P hydraulic radius, and S is bed slope; used for uniform flow design.

Standard Proctor test

Laboratory compaction test giving optimum moisture content and maximum dry density; heavier compaction effort lowers OMC and increases MDD.

Bernoulli's equation

For steady ideal incompressible flow along a streamline, p/γ + v²/2g + z = constant; expresses conservation of energy per unit weight of fluid.

Number series strategy

Check successive differences first, then ratios, then squares or cubes of consecutive integers, then interleaved alternating series, before assuming a complex rule.

Blood relation tree

Draw a family tree with explicit gender markers; vertical lines show generations, horizontal lines show marriage or siblings; never infer gender from a name.

Direction sense displacement

Track moves on a coordinate grid, then net displacement = √(x² + y²); each left or right turn rotates facing by 90 degrees.

Syllogism validity rule

A conclusion is valid only if it holds in every possible Venn diagram of the premises; 'some A are B' does not imply 'all A are B'.

Mirror versus water image

A mirror image reverses left and right while keeping up and down unchanged; a water image reverses up and down while keeping left and right unchanged.

Alphabet position coding

Assign A=1 through Z=26 or reverse Z=1 through A=26; find the shift between letters of the given word and its code, then apply the same shift.

Circular seating facing centre

When all persons face the centre, a person's left is clockwise and right is anticlockwise; fix the most constrained person first, then place others relative to them.

Odd-one-out test

Test each option against a single common property such as prime number, perfect square, divisibility by 3, or alphabet position; only one option should fail.

Article 32 remedies

Right to Constitutional Remedies under Article 32 lets a citizen move the Supreme Court directly for enforcement of Fundamental Rights; Ambedkar called it the heart and soul of the Constitution.

Directive Principles Part IV

Articles 36-51 contain Directive Principles of State Policy; they are non-justiciable guidelines for governance and are not enforceable in any court.

Indian Standard Meridian

Longitude 82°30′ E near Mirzapur, Uttar Pradesh, fixes Indian Standard Time as UTC + 5:30; India follows a single time zone despite its east-west spread.

Tropic of Cancer in India

Latitude 23°26′ N crosses eight Indian states including Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura, and Mizoram.

Longest peninsular river

The Godavari, rising near Nashik in Maharashtra and flowing into the Bay of Bengal, is the longest peninsular river and is called Dakshin Ganga.

pH scale meaning

pH below 7 is acidic, exactly 7 is neutral, and above 7 is basic; litmus turns red in acid and blue in base; human blood stays near 7.4.

SI unit of pressure

The pascal (Pa) equals one newton per square metre; force is measured in newtons, work in joules, power in watts, and frequency in hertz.

First woman IPS officer

Kiran Bedi became India's first woman Indian Police Service officer in 1972; she later served as Lieutenant Governor of Puducherry.

Section modulus rectangle

For a rectangular section of width b and depth d, the section modulus Z = bd²/6; the bending stress is σ = M/Z.

Simply supported beam UDL

For span L under uniform load w, maximum bending moment is wL²/8 at midspan and maximum shear is wL/2 at each support.

Cantilever point load

For a cantilever of length L with point load P at the free end, maximum moment is PL at the fixed end and tip deflection is PL³/(3EI).

Euler buckling load

Critical column load P_cr = π²EI/L_eff²; effective length is L for pinned-pinned, 0.5L for fixed-fixed, and 2L for fixed-free columns.

Poisson's ratio value

Poisson's ratio is lateral strain divided by longitudinal strain; typical values are about 0.3 for steel and 0.15 to 0.2 for concrete.

Torsion of circular shaft

Maximum shear stress τ = T·r/J and twist angle θ = TL/(GJ); for a solid circular shaft the polar moment J = πd⁴/32.

BM and SF relation

The slope of the shear force diagram equals the load intensity, and the slope of the bending moment diagram equals the shear force; moment is maximum where shear is zero.

Minimum slab reinforcement

IS 456 requires at least 0.12 percent of gross area for Fe415 HYSD bars in slabs and 0.15 percent for mild steel, to control cracking and shrinkage.