BLE class 8 question 2078/2079 | Class 8 Science Exam Questions

Science 2077 DLE Question (Comment for Ans)

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Attempts all the questions:

Physics:

1. What is a measurement? A body has mass 5 kg, what does it mean? Why is the unit of velocity called derived unit? (1+1+1=3)
2. A car starts from rest and retains the acceleration of 4m/s² in 20 seconds. Calculate its final velocity. (2)
3. What is the Ideal Machine? Write any two application of Simple Machine? (1+2=3)
4. Calculate pressure exerted by the column of mercury 76mm on the button of barometer. ( Density of mercury is 13600kg/m) (2)
5. Write down the relation between work and power.  Name the type of energy stored in the following objects. (2)
i. Magnet
ii. Bullet fired from a gun.
6. On which principle is the construction of thermometer based? Convert 200 Fahrenheit to Celcius. (1+2=3)
7. Write the difference between echo and reverberation. (2)
8. Write the formula to calculate the speed of sound. The frequency of sound is 200Hz, what does it mean? (1+2=3)
9. Write the properties of sulphuric acid. What is an open and closed chain? (1+2=3)
10. How is magnetic Induction done? (2)

Chemistry
11. What are diatomic particles? Draw an atomic model of magnesium. (1+2=3)
12. Write down the molecular formula of sodium bicarbonate and sulphuric acid. What is the shell? (2)
13. What is distillation? What kind of mixture is separated by fractional distillation? (1+2=3)
14. Write two properties of salt. (2)
15. Define base. What happens when Nitric Acid reacts with oxygen. Define the plaster of Paris. (1+1+1=3)
16. What is soft water? Write any two chemical properties of water.

Biology
17. Draw a well-labeled diagram of the candle flame? (3)
18. Define bacteriology. Write down the function of the calyx. (1+1=2)
19. Write down two characteristics of Epithelium tissue. Define meristematic tissue.  (2+1=3)
20. What is reproduction? Why asexual reproduction is common in primitive plant and animals? (1+2=3)
21. What is blood? Write down the differences between auricle and ventricle. (1+2=3)
22. Define system. (1)

Astronomy and Geology 
23. Explain the Nebula Hypothesis. What is the estimated age of the Earth? (2+1=3)
24. What is the effect of climate change? Define phases of the moon. (1+1=2)

Environment Science
25. What is biodiversity? Write any two conservation area of Nepal. (1+1=2)
26. Write down the importance of endangered animal. What is acid rain? (2+1=3)
27. The statement, "Green Forest is the property of Nepal" is being limited in a statement only. Justify. (3)
28. Write the name international agencies involved in Environmental Conservation. Write two functions of UNEP. (1+2=3)
29. Write two reasons for environmental degradation. (2)
30. Does sustainable development help to conserve resources? Write two effective reasons. (2)