Logo

Class 10 Compulsory Science and Technologyकक्षा १० विज्ञान तथा प्रविधि — SEE notes & solutions

class 10see

Class 10 SEE Compulsory Science and Technology Question Paper 2082 (SEE) – Solved

NEB

2082

Class 10 (SEE)

Compulsory Science and Technology

Full Marks: 75

Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.

"समूह 'क'"

तलका प्रश्नको ठिक विकल्प छानी उत्तरपुस्तिकामा लेख्नुहोस् : Choose the best alternative of the following questions and write in the answer sheet.

[10×1=10]

9.

A, B र C नामाइकृत तीनओटा विकर प्रत्येकमा 25 मिलिलिटर पानी लिइएको थियो । A, B र C विकरमा क्रमशः NaOH, सुखा CuSO₄ र NaCl हाल्दा विकर A र B को तापक्रम वृद्धि भएको तर विकर C मा तापक्रम घटेको पाइयो । तलका मध्ये कुन भनाइ सही छ ?

Three beakers labelled as A, B and C each containing 25 ml of water were taken. A small amount of NaOH, anhydrous CuSO₄ and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in temperature of the solution in beakers A and B whereas in beaker C, the temperature of the solution decreases. Which one of the statement is correct?

(i) विकर A र B मा तापदायक र C मा तापशोषक प्रतिक्रिया भएको छ ।

In beakers A and B, exothermic and C endothermic reaction has occurred.

(ii) विकर A र B मा तापशोषक र C मा तापदायक प्रतिक्रिया भएको छ ।

In beakers A and B, endothermic and C exothermic reaction has occurred.

(iii) विकर A, B र C मा तापदायक प्रतिक्रिया भएको छ ।

In beakers A, B and C exothermic reaction has occurred.

(iv) यो सूचनाको आधारमा ताप सम्बन्धी धारणा बनाउन सकिँदैन ।

Concept of heat cannot be developed by this information.

[1]

"समूह 'ख'"

तलका प्रश्नको अति छोटो उत्तर लेख्नुहोस् : Write very short answers of the following questions.

[9×1=9]

"समूह 'ग'"

तलका प्रश्नको छोटो उत्तर लेख्नुहोस् : Write short answers of the following questions.

[14×2=28]

"समूह 'घ'"

तलका प्रश्नको लामो उत्तर लेख्नुहोस् : Write long answer of the following questions.

[7×4=28]

7.

(a) हाइड्रोकार्बनको होमोलोगस श्रृङ्खला भनेको के हो ?

What is it meant by homologous series of hydrocarbon?

(b) सँगैको तालिकामा हाइड्रोकार्बनको होमोलोगस श्रृङ्खलाको एउटा उदाहरण दिइएको छ :

An example of homologous series of hydrocarbon is given in the table alongside:

यौगिक (Compound) होमोलोगस श्रृङ्खला (Homologous series)
A CH₃-CH₃
B CH₃-CH₂-CH₃
C CH₃-CH₂-CH₂-CH₃

(i) यौगिक 'B' को IUPAC नाम लेख्नुहोस् ।

Write the IUPAC name of the compound 'B'.

(ii) यौगिक 'A' मा रहेको एउटा हाइड्रोजन परमाणुलाई '-OH' ले विस्थापित गर्दा बन्ने यौगिकको संरचनात्मक सूत्र लेख्नुहोस् ।

Write the structural formula of the compound formed when one hydrogen atom of compound 'A' is displaced by '-OH'.

(iii) यौगिक 'C' मा रहेको बीचका दुईओटा कार्बनबाट एक एकओटा हाइड्रोजन निकाल्दा हुने यौगिकको सामान्य अणुसूत्र लेख्नुहोस् ।

Write the general molecular formula of the compound formed when one hydrogen atom from each of two middle carbon atoms are removed from the compound 'C'.

[4]