Explore topic-wise InterviewSolutions in Current Affairs.

(A) Coding strand

The correct answer is the Rhine.

• The busiest navigable river in the world is the Rhine river.

• Rhine
  • ​The Rhine flows in Switzerland, Liechtenstein, Austria, Germany, France, and the Netherlands.
  • It is the most important and busiest waterway in Europe.
  • Other busy waterways include the Seine and Loire rivers of France, the Danube river of eastern Europe, and the Volga river of Russia.

• Hwang-Ho
  • The river Hwang Ho is also known as the 'Sorrow of China'.
  • Because it often used to change its course after floods.
  • This caused major damage to crops and canals dug for the purpose of irrigation.
• Seine
  • The Seine is France's third-longest river, extending 485 miles from Dijon to the English Channel.
  • The river has been the subject of many famous impressionist paintings.
  • Famous impressionist paintings include Monet's Bathers at La Grenouillere and Renoir's Seine River at Asnieres.
• Loire
  • The Loire is the longest river in France.
  • The Loire River was designated a UNESCO World Heritage Site in 2002. 

c. Oligophagous 

d. All of above.

(2)  3 'TAACGTTA5 '

Correct option (2) 5 ¹AAUUCAAAUUAGG3¹

Correct option (3) 3.6 × 10²⁴

Explanation:

In HCP Z = 6 

T V = 2Z = 12 

TV ins 0.5 mol = 12 × 0.5 mol 

= 6 NA = 6 × 6.02 × 10²³ 

= 3.6 × 10²⁴ 

B. that the genetic code is degenerate 

(2) If both assertion and reason are true but reason is not the correct explanation of assertion. 

Correct option: 

(1) GCU, GCC, GCA

Correct option (4) Cr 

Explanation:

Fe oxidation state range + 2 to + 6 (but + 6 is less stable) 

Mg oxidation state + 2 

Co oxidation state range + 2 to + 4 

Cr oxidation state range + 1 to + 6 (but +6 is more stable)

(1) If both assertion and reason are true and reason is the correct explanation of assertion.

Correct option (1) CCC CCG CCU

The Correct option is (2) 5/2 RT

(3)  GGU, GGA, GGC

Correct option: (3) Ventral mouth - Terminal mouth

(3) Compound epithelium - Protection

(4) Male genital pore in present in 14^th segment

(3)  If assertion is true but reason is false.

(1)  Amphibia -Frog, Salamender, Bufo, Ichthyophis

(1) Haversian canal, lacuna, Lamellae, Haversian system

(2)  When ATP attached to myosin head

(4) It is nocturnal and present in damp places

(4)  All of these

(2) Housefly is the vector of amoebiasis.

Correct option

(1) Transcription and translation occur in same compartment for prokaryotes.

(2)  4 ^th , 5 ^th , 6 ^th abdominal segments

(2) Dog - 20-30 year

(1) Neutrophils and monocytes

Correct option (1) SER

Secondary pollutants are pollutants which form in the atmosphere.

Correct option (2) (a) - iv, (b) - iii, (c) - ii, (d) - i

(1) Closed type

(2) A–Coccus, B–Bacillus, C–Tobacco mosaic virus

Correct option is (2) Single stranded RNA viruses

Types of salt Hydrolysis :

(1) Hydrolysis of strong acid - weak base [SA - WB] type salt 

Ex: CaSO₄, NH₄Cl, (NH₄)₂SO₄, Ca(NO₃)₂, ZnCl₂, CuCl₂, CaCl₂ 

(2) Hydrolysis of [WA – SB] type salt

Ex: KCN, NaCN, K₂CO₃, BaCO₃, K₃PO₄ 

(3) Hydrolysis of (WA - WB) type salt : 

Ex: NH₄CN, CaCO₃, (NH₄)₂ CO₃, ZnHPO₃ 

(4) Hydrolysis of [SA – SB] type salt 

Ex: NaCl, BaCl₂ , Na₂SO₄ , KClO₄ etc.

Fertilisation is defined as the fusion of a male gamete (sperm) with a female gamete (an ovum or egg) to form a zygote during sexual reproduction external fertilisation.

(i) The fusion of male gamete (sperm) and female gamate (ovum) occur outside the body.

(ii) Both individuals discharge their gamates outside the body.

(iii) Development occurs outside the body.
Ex: Frog.

Internal fertilisation:

(i) The fusion of gametes occurs inside the body.

(ii) Only the male discharge sperm into female genetical tract.

(iii) Development occurs inside the body.
Ex : Humans, cattle etc.

The site of fertilisation in human beings is in the fallopian tube of female reproductive system.

Roasting: It is a process in which sulphide ore is heated in the presence of oxygen to convert into oxide.

2ZnS + 3O₂ → 2ZnO + 2SO₂

Calcination: It is a process in which carbonate ore is heated in the absence of air to form oxides.

ZnCO_3(s) \(\overset{Heat}{\longrightarrow}\) ZnO_(s) + CO₂

By reduction process Zn can be extracted from its ore.

Reduction: 2ZnO + C → ZnO + CO₂

Pure iron is very soft and stretches easily when hot. When it is mixed with a small quantity of carbon (0.05%), it becomes hard and strong and hence becomes more useful.

Cinnabar (HgS) on roasting is first changed to mercuric oxide which on further heating is reduced to mcrcury.
2HgS(s) + 3O₂(g)  +Heat  ---->2HgO(s) +      2SO₂(g)
                2HgO(s)+Heat    ----> 2Hg(l) +O₂(g)