मिति : २०७० साल जेष्ठ १८ गते लोकसेवा आयोगबाट लिईएको राजपत्र अनँकित दृतिय श्रेणी खरीदार वा सो सरहको खुुला र समावेशी समुुहमा सोधिएको द्धितिय पत्र अन्तर्गत विज्ञानका २५ ओटा प्रश्नहरु तथा तिनका उत्तरहरु

मिति : २०७० साल जेष्ठ १८ गते लोकसेवा आयोगबाट लिईएको राजपत्र अनँकित दृतिय श्रेणी खरीदार वा सो सरहको खुुला र समावेशी समुुहमा सोधिएको द्धितिय पत्र अन्तर्गत विज्ञानका २५ ओटा प्रश्नहरु तथा तिनका उत्तरहरु

 

1.Which of the following is correct reaction betⁿ  sodium and chlorine ?

Ans . 2NA + cl2 à2NACL

2.What is the chemical formula of washing soda ?

Ans. NA2CO3

3.Glycerol is a …..

Ans . Tryhydric alcohol

4.what is the chemical name of ammonium sulphate ?

Ans.( NH4)2 so4

5.what is the nitrogen fixation ?

Ans.process of conversion of atmospheric nitrogen into nitrate

6.when black and white mouse are crossed then the phenotype ratio in the f2 generation will be

Ans. 3M 1

7.In which stage the life cycle of mosquito is voracious ?

Ans . Larva

8.which factors does not belongs to blood ?

Ans.Nebulla ( Among the given answers )

9.what is the chemical properties (taste ) of blood ?

Ans.alkaline

10.The process of decomposing soil nitrogen into atmospheric nitrogen is called ………..

Ans .Dintrification

11.which of the following is not found in D.N.A ?

Ans . Uracil ( Among the given answers )

12.which of the following is the non renewable natural resources ?

Ans.Metalic mineral ( Among the given answers )

13.who is the known as father of computer ?

Ans.charles Babbage

14.which of the following is bound media ?

Ans.Fiber optics ( Among the given answers )

15.At which temperature does CO2 become dry ice ?

Ans. -78 Degree centigrade

16.In which unit system length in meter , mass in kilogram and time in second in measured ?

Ans, Metric system

17.what is the weight of a freely falling body on the  earth if its mass in 60 kg ?

Ans. O N

18.what is the amount of energy per square metre on surface of earth coming from the sun ?

Ans. 1.4 k.w.

19.what shoud be the minimum distance between source of sound and surface of the object for echo ?

Ans.15 m

20. How much heat energy is required to increase the temperature 1gm of pure water by 1 degree centigrade?

Ans.1 calorie

21.what is the invention of Michael faraday ?

Ans . magnet from elcectricity

22.According to Ohm law which statement is true ?

Ans . current is inversely proportional to potential difference .

23.If a transformer connected to 22oV has 1000 primary winding then what should be the number of secondary windings to produce 11 V as secondary voltage ?

Ans . 50 V

24. which of the following is chemical formula of nitric acid ?

Ans , HNO3

25. what is the formula of acetic acid ?

CH3COOH