8_Scince_Final

Shining Star Secondary Boarding School
Pre-Basic Level Examination
Class: 8
F.M:75
Subject: Science Time: 2:15 hours P.M: 30
Attempt all the questions:
Group-A (Physics):
1.a. Define fundamental and derived quantities with example. (2)
b. If a body moving on a straight line with the velocity of 10m/s and it changes
its velocity to 20m/s in 2 seconds, what is its acceleration? (3)
2.a. Show the relation between MA, VR and efficiency(n). (2)
b. Prove that P = dgh. (3)
3.a. Ram has power of 550 watt. What does it mean? (2)
b. Differentiate between heat and temperature. (2)
4.a. State the laws of refraction. (2)
b. Complete the ray diagram showing formation of an image. (2)
5.a. Differentiate between echo and reverberation. Calculate the frequency if
Wavelength and speed of a wave are 4m and 332m/s respectively. (3.5)
b. Explain molecular theory of magnetism. Sketch the diagram of simple
cell. (3.5)
Group-B (Chemistry):
6.a. State modern periodic law and sketch the electronic configuration of
Sulphur. (3)
b. What is chromatography? Distinguish between steam distillation and
fractional distillation. (3)
7.a. Alkali metals are more reactive than alkaline earth metal. Why? (2)
b. Define universal indicator? How is it different form an ordinary
indicator. (2)
8.a. How does boiling soften hard water? Describe with a chemical reaction. (2)
b. Translate the following word equations in the form of balanced formula
equations:
i. Sulphur + Oxygen à Sulphur dioxide
ii. Calcium hydroxide + Calcium dioxide à Calcium carbonate + Water. (3)

Group-C (Biology):
9.a. Draw a labelled diagram of virus. (3)
b. Write about the interrelation among cells, tissue and organs in the human
body. (2)
10.a. Describe modification of root. (2)
b. Write the name of tissue found in animal. (2)
11.a. Define: Dispersal of seed, budding, fusion, internal fertilization. (2)
b. Write short note on heart. (4)
Group-D (Astronomy and Geology):
12.a. Define ore minerals? How is soil formed? (2)
b. In which region of Nepal does it rain more? Why? Describe origin of the
earth. (3)
Group-E (Environment):
13.a. There is close relationship between forest and wildlife. Give reason. (2)
b. Give a short introduction of national park and wildlife reserve. (3)
14.a. What are environmental conservation? How can it be done? (2)
b. Define climate change. What are natural and anthropogenic factors of it?
(3)
15.a. What is biodiversity? Mention its different types. (2)
b. What is sustainable development? Mention any five principles of
sustainable development. (3)
The End