8th (VIII) Stars and The Solar System (Physics) | ||||||||||||||
Oral questions for Formative and Summative Assessments | ||||||||||||||
Q.1.Name the planet appears I the northern sky before sun rise? | ||||||||||||||
Ans: Venus brightest of all planets | ||||||||||||||
Q.2. Name the planet which has 28 moons? | ||||||||||||||
Ans: Jupiter manly consist of hydrogen and helium gases | ||||||||||||||
Q.3. In which direction stars move except Polar star? | ||||||||||||||
Ans: When seen from earth stars appears to move from east to west. | ||||||||||||||
Q.4. Why pole star appears stationary? | ||||||||||||||
Ans: As it lies on the imaginary axis of the rotation of the earth. | ||||||||||||||
Q.5.Which two planets have asteroids between them? | ||||||||||||||
Ans: asteroids are the rocks pieces that revolve around the sun between the orbit of Mars and Jupiter. | ||||||||||||||
Q.6. Which comet visit the earth after 76 year? | ||||||||||||||
Ans: Halley�s comet. Heavenly bodies that revolve around the sun and appears as bright as glowing ball with a long tail is called comet. | ||||||||||||||
Q.7.What happen to meteors when enters the earth�s atmosphere? | ||||||||||||||
Ans: meteors when enters the earth�s atmosphere starts glowing and are seen as a bright steak of light fleshing momentarily across the sky. | ||||||||||||||
Q.8.What is the high tog geostationary satellite from the earth surface? | ||||||||||||||
Ans: 36000km and used for satellite communicacation. | ||||||||||||||
Q.9. What does term INSAT mean? | ||||||||||||||
Ans: Indian National Satellite. | ||||||||||||||
Q.10.Name the first Indian satellite launched success fully. | ||||||||||||||
Ans : Aryabhata on 19 april,1975 | ||||||||||||||
Q.11. Some stars are bright and some are dim; some stars look white while some may look blue and some red. why? | ||||||||||||||
Answer: Stars differ in apparent brightness for two reasons; one is that they are at different distances and the other is that they differ in their intrinsic (actual) brightness | ||||||||||||||
Fill in the blanks | ||||||||||||||
1. The distance of the sun from the earth is nearly ---------- | ||||||||||||||
Answer: 1.5 x 108 km | ||||||||||||||
2. Light takes about ----------- to travel from the sun to the earth | ||||||||||||||
Answer: 8 minutes | ||||||||||||||
3. The sun rotates from west to east with a period of about --------- | ||||||||||||||
26 days | ||||||||||||||
4.The visible disc of the sun is called ------------ | ||||||||||||||
Answer: photosphere | ||||||||||||||
5. The layer just above the photosphere is called the -------------- | ||||||||||||||
Answer: chromosphere | ||||||||||||||
6. The region beyond chromospheres is called ------------- | ||||||||||||||
Answer: corona | ||||||||||||||
7. The total energy emitted by a star in one second is called its ---------- | ||||||||||||||
Answer: luminosity | ||||||||||||||
8. -------------- is the study of the universe. It deals especially with the search for suitable theories to understand the observed universe, its origin and its future. | ||||||||||||||
Answer: Cosmology
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CBSE HIGHER ORDER THINKING SKILLS (HOTS) QUESTIONS 1) Write any two ways of energy flow through an ecosystem. 2) Differentiate between biodegradable and non biodegradable with respect to the effect of biological processes on them and the way they affect our environment. 3) Which level shows the maximum biological magnification? Why? 4) Why is a pond self sustaining unit while an aquarium may not be? Justify the answer. 5) Arrange grasshopper, frog, grass, eagle and snake in the form of food chain. 6) If 1000 KJ energy is available at producer level, how much energy will be available at first carnival level? 7) Why do most food chains have 3-5 steps only? 8) Select the biodegradable items from the list given below- Polythene bags, old clothes, wilted flowers, pencil shavings, glass bangles, bronze statue, vegetable peels. 9) What will be impact on ecosystem if bacteria and fungi are removed from the Environment? 10) Express your feelings on the picture given down below. What will happen...
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