WBCS Prelims 2017 General Science Question and Solution


   In West Bengal Civil Service (WBCS) Preliminary Examination 2017, total 25 questions was asked from General Science.

1. The material used for safety from nuclear radiation is

[A]  Copper  

[B]  Platinum 

[C]  Iron  

[D] Lead

Correct Answer: [D] Lead

2. The electric appliances in a house are connected

[A]  In series 

[B] In  parallel 

[C]  Either in series or in parallel

[D] Both in series and in parallel

Correct Answer: [B] In  parallel 

3. The immersed portion of a piece of pure ice floating in water is

[A]  8/9th of its volume       

[B]  9/10th of its volume

[C]  10/11th of its volume

[D] 11/12th of its volume

Correct Answer: [D] 11/12th of its volume

4. ‘Red’ is used as a danger signal because

[A]  Blood is red

[B]  Red light is scattered least by the air molecules

[C]  Red colour is easily available

[D] Red colour is soothing for eye

Correct Answer: [B]  Red light is scattered least by the air molecules

5. A shaving brush is dipped in water. When taken out the hairs of the brush are seen to be drawn together due to
[A]  Surface tension of water

[B]  Viscosity of water

[C]  Elasticity of the hairs of the brush

[D] Temperature difference between air and water

Correct Answer: [A]  Surface tension of water

6. A body is acted upon by two unequal forces in opposite directions, but not in one line. The effect is that the body will have

[A]  Only rotational motion

[B]  Only translational motion

[C]  Neither the rotational nor the translational motion

[D] Rotational as well as translational motion

Correct Answer: [D] Rotational as well as translational motion

7. ‘RADAR’ stands for

[A]  Radio Detection and Ranging

[B]  Ready Advanced Appliance for Ranging

[C]  Range Detection Appliance for Airplane Ranging

[D] Ready Advanced Airplane Ranging 

Correct Answer: [A]  Radio Detection and Ranging

8. A reaction is spontaneous when

[A]  ΔG = -ve        

[B]  ΔH = -ve        

[C]  ΔS = +ve        

[D] ΔS = -ve

Correct Answer: [A]  ΔG = -ve        

9. Geometry of SF4 is

[A]  Square planar        

[B]  Tetrahedral

[C]  Octahedral

[D] See-saw

Correct Answer: [D] See-saw

10. The strongest electropositive element is

[A]  Cs

[B]  Li

[C]  Mg

[D] K

Correct Answer: [A]  Cs

11. Conversion of CH3C = CH to CH3CH = CH2 needs

[A]  Lindlar catalyst         

[B]  H2Pd

[C]  NaBH4  

[D] LiAlH4

Correct Answer: [A]  Lindlar catalyst         

12. Conversion of RBr to RMgBr requires

[A]  Mg / dry ether / N2 -atmosphere

[B]  Mg / moist ether / N2 -atmosphere

[C]  Mg / ethanol / N2 -atmosphere

[D] Mg / dry ether / O2 -atmosphere

Correct Answer: [A]  Mg / dry ether / N2 -atmosphere

13. The fastest SN1 reaction is of the followings:

[A]  MeO – CH2-Cl        

[B]  Me-CH2-Cl

[B]  Me-C-CH2-Cl       

[D] Ph-CH2-CH2-Cl

Correct Answer: [A]  MeO – CH2-Cl        

14. An example of modified underground stem is

[A]  Carrot 

[B]  Potato 

[C]  Groundnut

[D] Turnip

Correct Answer: [B]  Potato 

15. Which of the following processes makes direct use of oxygen?

[A]  Glycolysis

[B]  Fermentation

[C]  Citic Acid Cycle       

[D] Electron transport

Correct Answer: [D] Electron transport

16. Crossing over occurs during meiosis at

[A]  Leptotene

[B]  Anaphase-I        

[C]  Pachytene

[D] Diakinesis

Correct Answer: [C]  Pachytene

17. The well known antibiotic penicillin is obtained from this plant group:

[A]  Algae

[B]  Fungi 

[C]  Lichen 

[D] Angiosperm

Correct Answer: [B]  Fungi 

18. The nature of stele in primitive vascular plants was

[A]  Protostele 

[B]  Siphonostele

[C]  Dictyostele

[D] Atactostele

Correct Answer: [A]  Protostele 

19. What is a bacteriophage?

[A]  A virus

[B]  A bacterium growing in artificial nutrient medium

[C]  A fungus causing disease

[D] A phagocytic protozoa

Correct Answer: [A]  A virus

20. “Particulate theory of inheritance” was pro­posed by

[A]  Charles Darwin       

[B]  Gregor Johann Mendel       

[C]  Herman Muller       

[D] T.H.Morgan

Correct Answer: [B]  Gregor Johann Mendel       

21. Which one of the following animal phylum is latest by discovery?
[A]  Pogonophora

[B]  Kinorhyncha

[C]  Loricifera

[D] Ctenophora

Correct Answer: [C]  Loricifera

22. A mammal that lays eggs:

[A]  Talpa

[B]  Echidna

[C]  Pteropus

[D] Lemur

Correct Answer: [B]  Echidna

23. Barr body is absent in somatic cell of
[A]  Klinefelter syndrome individual

[B]  Tripple X syndrome individual

[C]  Turner syndrome individual    

[D] Sub-human mammalian female individual

Correct Answer: [D] Sub-human mammalian female individual

24. 1 nm is equivalent to

[A]  1.0Å         

[B]   100Å         

[C]  10µm  

[D] .01mm

Correct Answer: [A]  1.0Å         

25. Necton are

[A]  Floating organisms in water

[B]  Swimming organisms in water

[C]  Animals associated with aquatic plants

[D] Sub-merged plants in water

Correct Answer: [B]  Swimming organisms in water

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