WBCS Prelims 2013 General Science Question and Solution



   In West Bengal Civil Service (WBCS) Preliminary Examination 2013, total 21 questions was asked from General Science.

1. Dyne-sec, stands for the unit of :

[A]  Force 

[B]  Momentum

[C]  Energy  

[D] Power

Correct Answer: [A]  Force 

2. For the same Kinetic energy, the momentum shall be maximum for :

[A]  Electron 

[B]  Proton

[C]  Deuteron 

[D] Alpha particle

Correct Answer: [D] Alpha particle

3. An ice cube containing a large bubble of air is floating in water contained in a large beaker. When the ice melts completely, the level of water will :

[A]  Remain unchanged        

[B]  Go down        

[C]  Rise

[D] First rise and then go down

Correct Answer: [A]  Remain unchanged        

4. Water is boiling in a flask over a burner. To reduce its boiling temperature one must —

[A]  Reduce the surrounding temperature

[B]  Connect the mouth of the flask to an evacuating system

[C]  Supply heat from a less intense source

[D] Connect the mouth of the flask to a compressor

Correct Answer: [B]  Connect the mouth of the flask to an evacuating system

5. One of the breakthrough of Acharya P. C. Roy was to synthesize the following compound :

[A]  HgCl2

[B]  HgO  

[C]  Hg2Cl2   

[D] H2O4

Correct Answer: [C]  Hg2Cl2   

6. Whose presence in drinking water is welcome?

[A]  K

[B]  Ca

[C]  As

[D] Fe

Correct Answer: [A]  K

7. Muriatic acid used in household work is diluted form of —

[A]  Acetic acid       

[B]  Hydrochloric acid       

[C]  Oxalic acid       

[D] Aqua regia

Correct Answer: [B]  Hydrochloric acid       

8. Phenyl used in household work is a derivative of —

[A]  Methyl alcohol       

[B]  Tartaric acid        

[C]  Benzene 

[D] Anthracene

Correct Answer: [B]  Tartaric acid        

9. Which metal ion is associated with Haemoglobin?

[A]  Mg++       

[B]  Fe++       

[C]  Al++

[D] Mn++

Correct Answer: [B]  Fe++       

10. Instruments can be shielded from the effects of external magnetic fields by surrounding them with —

[A]  A glass shield       

[B]  A rubber shield       

[C]  A brass shield      

[D] An iron shield

Correct Answer: [B]  A rubber shield       

11. Endemic plants are those which grow in —

[A]  Fresh water lakes       

[B]  Shady places       

[C]  On other plants        

[D] Geographically limited areas

Correct Answer: [D] Geographically limited areas

12. In angiosperm, triple fusion is required for the formation of —
[A]  Embryo

[B]  Endosperm 

[C]  Suspensor  

[D] Pericarp

Correct Answer: [B]  Endosperm 

13. Part of earth where life exist is known as —

[A]  Lithosphere 

[B]  Hydrosphere

[C]  Atmosphere

[D] Biosphere

Correct Answer: [D] Biosphere

14. Spraying of DDT in crop plants produces pollution of —

[A]  Air only      

[B]  Air and soil only       

[C]  Air, soil and water only      

[D] Air and water only

Correct Answer: [C]  Air, soil and water only      

15. Oil is obtained from the endosperm of —

[A]  Groundnut

[B]  Coconut 

[C]  Mustard  

[D] Sesame

Correct Answer: [B]  Coconut 

16. The number of cervical vertebrae in mammal is —

[A]  Seven  

[B]  Seventeen

[C]  Seventy seven      

[D] Eleven

Correct Answer: [A]  Seven  

17. Limbless Amphibian belongs to the order —

[A]  Brain

[B]  Blood  

[C]  Thyroid

[D] Pancreas

Correct Answer: [B]  Blood  

18. Which one of the following is a rich source of amylase?

[A]  Brain    

[B]  Blood  

[C]  Thyroid 

[D] Pancreas

Correct Answer: [B]  Blood  

19. Birds differ from bat in the absence of —

[A]  Warm blood       

[B]  Four chambered heart      

[C]  Trachea   

[D] Diaphragm

Correct Answer: [D] Diaphragm

20. Portion of the carapace which covers the gill of prawn is known as —

[A]  Bronchus 

[B]  Branchiostegal membrane       

[C]  Branchiostegite 

[D] Branchiostegal spine

Correct Answer: [D] Branchiostegal spine

21. ‘Higgs Boson’ is :

[A]  Name of a film       

[B]  An elementary particle       

[C]  Generic name of a medicine     

[D] Planet

Correct Answer: [B]  An elementary particle       

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