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Sunday, 4 February 2018

UPSC CDS Answer Key 2018 with Questions for Paper 2 (General Knowledge)

  By GK Planet Team       Sunday, 4 February 2018

UPSC CDS 1 2018 GK Answer Key

Directions :The following seven[7] items consists of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below.
Code :
[a] Both the statements are individually true and Statement II is the correct explanation of Statement I
[b] Both the statements are individually true but Statement II is not the correct explanation of Statement I
[c] Statement I is true but Statement II is false
Statement I is false but Statement II is true

Q.1) Statement I :
By far the most common topographic form in a Karst terrain is the sinkhole
Statement II :
Topographically, a sinkhole is a depression that varies in depth from less than a matter to few hundred meters.
Answer B
A sinkhole is a hole in the ground that forms when water dissolves surface rock. Often, this surface rock is limestone, which is easily eroded, or worn away, by the movement of water.
In a landscape where limestone sits underneath the soil, water from rainfallcollects in cracks in the stone. These cracks are called joints. Slowly, as the limestone dissolves and is carried away, the joints widen until the ground above them becomes unstable and collapses. The collapse often happens very suddenly and without very much warning. Water collects in these collapsed sections, forming sinkholes.

Sinkholes also form when the roofs of caves collapse. Sinkholes are often funnel-shaped, with the wide end open at the surface and the narrow end at the bottom of the pool.

Q.2) Statement I :
Incised meanders are formed in the mature stage of a river
Statement II :
Incised meanders are characterized by rejuvenation and upliftment of land.

Answer D
A meandering river valley that has cut down its bed into the bedrock, because of uplift or lowered base level, is called incised, intrenched, entrenched, inclosed or ingrown. It is characteristic of antecedent drainage systems. Finer distinctions are recognized by some authorities. Thornbury (1954)proposed that incised or inclosed meanders are terms appropriate to all sorts of meanders cut down into bedrock, and that two sub-types should be identified:
Intrenchedorentrenched meanders are those cut down with symmetrical valley sides, i.e., due to rapid down-cutting; and
Ingrown meanders (Rich, 1914) are those with a pronounced asymmetry of cross section, which would normally develop under slower incision.

Q.3) Statement I :
Portions of glacial troughs may exhibit remarkably flat floors.
Statement II :
The flat floor in a glacial trough is produced by uniform glacial erosion.
Answer A
Glaciers cut distinctive U-shaped valleys with a flat floor and steep sides. The glacier widens, steepens, deepens and smoothes V-shaped river valleys, eg Great Langdale Valley in the Lake District.

Q.4) Statement I :
In Tundra climate, biodiversity is comparatively less
Statement II :
Tundra climate has less reproductive warm period
Answer B
Species richness is generally lower in the Arctic than at lower latitudes, and richness also tends to decline from the low to high Arctic. However, patterns of species richness vary spatially and include significant patchiness. Further, there are differences among taxonomic groups, with certain groups being most diverse in the Arctic.

Q.5) Statement I :
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth
Statement II :
The Earth rotates from west to east.
Answer B

Q.6) Statement I :
A person may suffer from tuberculosis if she/he frequently visits crowded place.
Statement II :
Bacteria of tuberculosis spread through droplets by sneezing or coughing.
Answer D
Tuberculosis (TB) is caused by a type of bacterium called Mycobacterium tuberculosis.It's spread when a person with active TB disease in their lungs coughs or sneezes and someone else inhales the expelled droplets, which contain TB bacteria.

Q.7) Statement I :
Bioaccumulation is a process of progressive accumulation of heavy metals and pesticides in an organism
Statement II :
Large fishes of the pond are found to have higher concentration of pesticides than planktons of the same period.
Answer B
Bioaccumulation is defined as the increase in concentration of a substance(s) in an organism or a part of that organism.Toxic substances are lipophilic or fat-loving, the reason why these substances are deposited and concentrated in the fat tissues of the organisms. The affected organism has a higher concentration of the substance than the concentration in the organism's surrounding environment. The toxic substances are very slowly metabolized or excreted so if the organism keeps on consuming prey or food contaminated with toxic substances, the concentration of the substance will further increase in its body, hence, bioaccumulation results. When a certain threshold level is reached, measured in parts per million (ppm), symptoms due to the type of toxin are manifested.

Q.8) Which one of the following is a true fish as per the biological system of classification?
a) Silver fish
b) Jelly fish
c) Cuttle fish
d) Flying fish

Q.9) In which one of the following types of connective tissues in animals does fat get stored?
a) Adipocyte
b) Chondrocyte
c) Osteocyte
d) Reticulocyte
Adipocytes are cells that derive from multipotential mesenchymal cells; their main role is to store energy in the form of lipids to cushion and insulate the body from the outer environment. Although the lineage of adipocytes is still unclear, pre-adipocytes are thought to be undifferentiated fibroblasts that can be stimulated to form adipocytes. Adipose tissue was recently recognized as a major endocrine organ because it produces not only hormones such as leptin, estrogen, resistin, and TNF-α but also ALP, type 1 collagen, Opn, Runx2, and Ocn

Q.10) Which one of the following pairs about organ/part that helps in locomotion is not correctly matched?
a) Euglena : Flagellum
b) Paramecium : Cilia
c) Nereis : Pseudopodia
d) Starfish: Tube feet

Q.11) Lysosome is formed from which of the following cell organelles?
a) Nucleus
b) Endoplasmic reticulum
c) Golgi bodies
d) Ribosomes
Lysosomes are spherical membranous sacs of enzymes. These enzymes are acidic hydrolase enzymes that can digest cellular macromolecules. The lysosome membrane helps to keep its internal compartment acidic and separates the digestive enzymes from the rest of the cell.
Lysosome enzymes are made by proteins from the endoplasmic reticulum and enclosed within vesicles by the Golgi apparatus. Lysosomes are formed by budding from the Golgi complex.
Q.12) A protein is synthesized in the endoplasmic reticulum bound ribosomes and it targets to the inner thylakoid space of chloroplast. How many double layered membrane layers it has to pass to reach its destination?
a) 2
b) 3
c) 4
d) 5

Q.13) Which of the following causes adiabatic temperature changes in atmosphere?
a) Deflection and advection
b) Latent heat of condensation
c) Expansion and compression of the air
d) Partial absorption of solar

Q.14) Which one of the following is applicable to collision-coalescence process of precipitation?
a) Clouds which do not extend beyond the freezing level
b) Clouds which extend beyond the freezing level
c) All types of clouds
d) Cirrocumulus cloud

Q.15) Which one of the following places of India experiences highest atmospheric pressure during winter?
a) Jaisalmer
b) Leh
c) Chennai
d) Guwahati

Q.16) Match List-I with List-II and select the correct answer using the code given below the Lists :
List –I
[Hypothesis / Theory]
A. Planetesimal hypothesis
B. Thermal contraction theory
C. Geosynclinal Orogen theory
D. Hypothesis of sliding continent
List-II
[Propounder]
1. Kober
2. Chamberlin
3. Daly
4. Jeffreys
Code :
A B C D
a) 2 4 1 3
b) 2 1 4 3
c) 3 1 4 2
d) 3 4 1 2

Q.17) Bright light is found to emit from photographer’s flashgun. This brightness is due to the presence of which one of the following noble gases?
a) Argon
b) Xenon
c) Neon
d) Helium

Q.18) Which one of the following is not a characteristic of a compound?
a) Composition is variable
b) All particles of compound are of only one type
c) Particles of compound have two or more elements
d) Its constituents cannot be separated by simple physical methods.

Q.19) Which of the following substances cause temporary hardness in water?
1. Mg[HCO3]2
2. Ca[HCO3]2
3. CaCl2
4. MgSO4
Select the correct answer using the code given below:
a) 3 and 4
b) 2 and 3
c) 1 and 4
d) 1 and 2

Q.20) Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40?
a) Element with 20 protons and 18 neutrons
b) Element with 18 protons and 19 neutrons
c) Element with 20 protons and 19 neutrons
d) Element with 18 protons and 22 neutrons

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