SSC-JUNIOR ENGINEER (Civil & Structural) Online Exam 2016 (Part-IV)

Total Questions: 50

1. Hydrochloric acid in the stomach provides the acidic pH _________ of which is optimal for pepsins.

Correct Answer: B. 1.8
Solution:Pepsin converts proteins into proteoses and peptones (peptides). The mucus bicarbonates present in the gastric juice play an important role in lubrication and protection of the mucosal epithelium from excoriation by the highly concentrated hydrochloric acid. HCl provides the acidic pH (pH 1.8) optimal for pepsins.

Rennin is a proteolytic enzyme found in gastric juice of infants which helps in the digestion of milk proteins. Small amounts of lipases are also secreted by gastric glands.

2. ___________ are the most abundant cells (60-65 per cent) of the total White Blood Cells.

Correct Answer: B. Neutrophils
Solution:Neutrophils are the most abundant white blood cells and play an important role in the immune system. They form approximately 60-65% of granulocytes and are phagocytes.

They are approximately 10 - 12mu*m in diameter and capable of ingesting microorganisms. They contain lysozymes; therefore, their main function is to protect the body from any foreign material. They are capable of moving out of blood vessel walls by a process called diapedesis and are actively phagocytic. A non-active neutrophil lasts approximately 12 h, while an active neutrophil may last 1-2 days.

Neutrophils are the first immune cells to arrive at a site of infection, through a process known as chemotaxis. A deficiency of neutrophils is called neutropenia, which may be congenital or acquired; for example, in certain kinds of anaemia and leukaemia, or as a side effect of chemotherapy. Since neutrophils are such an important part of the immune response, a lowered neutrophil count result in a compromised immune system.

3. In which type of flower the gynoecium occupies the highest position while the other parts are situated below it?

Correct Answer: C. Hypogynous
Solution: Hypogynous: The thalamus is convex and ovary occupies the highest position on it. The other three whorls lie below the ovary. In other words-ovary is superior and other floral whorls are inferior, e.g., brinjal, china rose, mustard, etc.

4. Through which part of the leaves plants lose maximum water?

Correct Answer: A. Stomata
Solution:Stomatal transpiration: Stomata are minute pores in the epidermis. Their opening and closing is controlled by guard cells. Maximum loss of water vapour takes place through these pores. The loss of water vapours through stomata amounts to about 80-90% of the total loss. Stomata are mostly situated on leaves but in green stems also they may be found in epidermis.

In dorsiverntral leaves, the lower surface has a large number of stomata. Therefore, it transpires more vigorously than the upper surface. In isobilateral leaves stomata are uniformly distributed on both the surfaces. Thus, in such leaves transpiration is more or less equal on the two surfaces.

5. Consider the following pairs:

NameFormula
Propan-2-olCH₃CH₂CH₂CH₂CHO
1-Bromo-2,2-dimethylpropane(CH₃)₃CCH₂Br
MethanalHCHO
PentanalCH₃–CH(OH)-CH₃

Which of the above pairs are correctly matched?

Correct Answer: A. 2 and 3 only
Solution:Propane-2-ol : CH₃C (OH) - CH₃
1-Bromo-2,2-dimethylpropane: (CH₃I₃CCHzBr
Methanal : HCHO
Pentanal : C₅H₁₀O or CH₃ (CH₂)₃ CHO

6. What is the IUPAC name of n-Propyl fluoride?

Correct Answer: C. 1-Fluoropropane

7. Formula for 1, 3 butadiene is _____________.

Correct Answer: A. CH₂ = CH – CH = CH₂
Solution:1, 3-Butadiene : C₄H₆

8. Which of the following elements has the highest atomic number?

Correct Answer: A. Lead
Solution:In group IVA of the periodic table there are five chemical elements: Carbon (C), silicon Si, germanium Ge, tin Sn and lead Pb.

The atoms of these elements have the following configurations:

9. Which character informs browsers to stop tagging the text (in HTML)?

Correct Answer: A. /
Solution:No explanation given in the book

10. Using the end key in Microsoft Word, processor moves the cursor to the end of the __________.

Correct Answer: D. line
Solution:In Microsoft Word, if you press the "home" or "end" keys, it makes the cursor jump to the beginning or end of the line that it is on. But in LibreOffice, it jumps to the beginning on end of the entire document.