# WBCS Prelims 2015 General Science Question and Solution

### GENERAL SCIENCE QUESTION AND SOLUTION(QUIZ) – WBCS PRELIMS 2015

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

2. The solar cooker works on the same principle as

[A]  Bolometer

[B]  Pyrometer

[C]  Greenhouse

[D] Galvanometer

3. LED stands for

[A]  Light emitting device

[B]  Light emitting diode

[C]  Light encapsulated device

[D] Light emitting dots

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

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

[A]  + 40°

[B]  + 20°

[C]  – 20°

[D]  – 40°

6. Mg2+ is isoelectronic with

[A]  Ca2+

[B]  Na+

[C]  Zn2+

[D] Cu+

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

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: [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

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

11. Chemically Aspirin is:

[A]  Acetyl salicylic acid

[B]  Sodium salicylate

[C]  Methyl salicylate

[D] Ethyl salicylate

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

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

14. The Pyrimidine bases in a DNA are:

[C]  Cytosine and Guanine

[D] Thymine and Sytosine

Correct Answer: [D] Thymine and Sytosine

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

[A]  NAA

[B]  IAA

[C]  2, 4-D

[D] IBA

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

17. During cell division, DNA synthesis takes place in

[A]  Interphase

[B]  Anaphase

[C]  Prophase

[D] Telophase

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

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: [D] Absence of oxygen

20. Cerebral Malaria is caused by

[A]  Plasmodium vivax

[B]  Plasmodium malariae

[C]  Plasmodium falciparum

[D] None of the above

21. “Natural Selection” is the theory from

[A]  G. J. Mendel

[B]  Charles Darwin

[C]  T. H. Morgan

[D] None of the above

[A]  Forest and vegetative cover

[B]  Rivers and their courses

[D] All of the above

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

24. One turn of DNA helix measures

[A]  34A°

[B]  3.4A°

[C]  24A°

[D] 44A°

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: [A]  9 : 3 : 3 : 1

26. Cranial nerve in mammals are

[A]  10 pairs

[B]  10

[C]  12 pairs

[D] 12