WBCS Prelims 2015 General Science Question and Solution


       In West Bengal Civil Service (WBCS) Preliminary Examination 2015, total 26 questions was asked from General Science.

1. If there were no atmosphere, the earth would have been

[A]  Slightly hot      

[B]  Slightly cold       

[C]  Very hot       

[D] Very cold

Correct Answer

Correct Answer: [C]  Very hot       

2. The solar cooker works on the same principle as

[A]  Bolometer

[B]  Pyrometer

[C]  Greenhouse 

[D] Galvanometer

Correct Answer

Correct Answer: [C]  Greenhouse 

3. LED stands for

[A]  Light emitting device      

[B]  Light emitting diode     

[C]  Light encapsulated device     

[D] Light emitting dots

Correct Answer

Correct Answer: [B]  Light emitting diode     

4. Hydraulic press is based on

[A]  Archimedes’ law        

[B]  Pascal’s law        

[C]  Reynold’s law        

[D] Bernouli law

Correct Answer

Correct Answer: [B]  Pascal’s law        

5. At what temperature, Celsius and Fahrenheit readings will be same?

[A]  + 40°       

[B]  + 20°       

[C]  – 20°       

[D]  – 40°       

Correct Answer

Correct Answer: [D]  – 40°       

6. Mg2+ is isoelectronic with

[A]  Ca2+        

[B]  Na+       

[C]  Zn2+      

[D] Cu+

Correct Answer

Correct Answer: [B]  Na+       

7. Hybridization of C2 and C3 of
 1        2    3    4    5 
CH3−CH−C−CH−CH3 are

[A]  sp   sp3        

[B]  sp2  sp        

[C]  sp2   sp2       

[D] sp  sp

Correct Answer

Correct Answer: [C]  sp2   sp2       

8. When a ball is taken from the equator to the pole of the earth

[A]  Its mass increases      

[B]  Both its mass and weight change

[C]  Its weight increases       

[D] Its weight decreases

Correct Answer

Correct Answer: [C]  Its weight increases       

9. The compound that cannot be kept is glass vessel because it reacts with glass is

[A]  HNO3 

[B]  HCl 

[C]  HF  

[D]  HBr

Correct Answer

Correct Answer: [C]  HF  

10. How many grams of NaOH are needed to make 100ml. of a 0.5 M solution of NaOH ? (Atomic weight : Na = 23, 0 = 16,  H = l)

[A]  2

[B]  20

[C]  4

[D] 1

Correct Answer

Correct Answer: [A]  2

11. Chemically Aspirin is:

[A]  Acetyl salicylic acid      

[B]  Sodium salicylate      

[C]  Methyl salicylate        

[D] Ethyl salicylate

Correct Answer

Correct Answer: [A]  Acetyl salicylic acid      

12. In which layer of the atmosphere does ozone act as a UV radiation shield ?

[A]  Troposphere

[B]  Thermosphere 

[C]  Stratosphere  

[D] Mesosphere

Correct Answer

Correct Answer: [C]  Stratosphere  

13. Transfer of pollen from another to the stigma of the same flower is referred to as:

[A]  Allogamy

[B]  Geitenogamy

[B]  Xenogamy

[D] Autogamy

Correct Answer

Correct Answer: [D] Autogamy

14. The Pyrimidine bases in a DNA are:

[A]  Adenine and Guanine       

[B]  Thymine and Adenine

[C]  Cytosine and Guanine      

[D] Thymine and Sytosine

Correct Answer

Correct Answer: [D] Thymine and Sytosine

15. Which one of the following is the natural auxin?

[A]  NAA

[B]  IAA

[C]  2, 4-D


Correct Answer

Correct Answer: [B]  IAA

16. Which is the following gets its name from a river in the Democratic Republic of Congo?

[A]  Chikungunia virus        

[B]  Lassa fever       

[C]  Salmonella bacteria       

[D] Ebola virus

Correct Answer

Correct Answer: [D] Ebola virus

17. During cell division, DNA synthesis takes place in

[A]  Interphase 

[B]  Anaphase  

[C]  Prophase   

[D] Telophase

Correct Answer

Correct Answer: [A]  Interphase 

18. In monohybrid cross of Mendel, when a pure tall plant was crossed with a dwarf plant, all the F1 progeny were tall, because of:

[A]  Co-dominance       

[B]  Dominance 

[C]  Incomplete dominance       

[D] Epistasis

Correct Answer

Correct Answer: [B]  Dominance 

19. One of the characteristics of the atmosphere of pre-biotic primitive earth was :

[A]  Absence of hydrogen        

[B]  Absence of water vapour

[C]  Absence of nitrogen        

[D] Absence of oxygen

Correct Answer

Correct Answer: [D] Absence of oxygen

20. Cerebral Malaria is caused by

[A]  Plasmodium vivax      

[B]  Plasmodium malariae      

[C]  Plasmodium falciparum      

[D] None of the above

Correct Answer

Correct Answer: [C]  Plasmodium falciparum      

21. “Natural Selection” is the theory from

[A]  G. J. Mendel       

[B]  Charles Darwin       

[C]  T. H. Morgan       

[D] None of the above

Correct Answer

Correct Answer: [B]  Charles Darwin       

22. Satellites provide information about

[A]  Forest and vegetative cover        

[B]  Rivers and their courses

[C]  Advancing storms and cyclones       

[D] All of the above

Correct Answer

Correct Answer: [D] All of the above

23. Coal, Petroleum and Natural Gas are examples of

[A]  Fossil Fuels        

[B]  Cryogenic Fuels       

[C]  Indigenous Fuels       

[D] Radioactive Fuels

Correct Answer

Correct Answer: [A]  Fossil Fuels        

24. One turn of DNA helix measures

[A]  34A°       

[B]  3.4A°       

[C]  24A°       

[D] 44A°

Correct Answer

Correct Answer: [A]  34A°       

25. Phenotypic ratio of Mendelian Dihybrid cross is

[A]  9 : 3 : 3 : 1      

[B]  1 : 1 : 1 : 1       

[C]  3 : 4 : 3 : 1      

[D]  1 : 2 : 1 : 1

Correct Answer

Correct Answer: [A]  9 : 3 : 3 : 1      

26. Cranial nerve in mammals are

[A]  10 pairs       

[B]  10  

[C]  12 pairs       

[D] 12

Correct Answer

Correct Answer: [C]  12 pairs       

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