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Posted By: mohana murali Member Level: Bronze Posted Date: 16 Jun 2008
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2008 CBSE 7th grade Science annual exam - Physics Question paper
PHYSICS Marks: 30
I. Answer the following questions in one sentence. MARKS :(1*6=6)
1. Define: Dispersion
2.State rectilinear propagation of light
3. What do you mean by focal length?
4. State Bernoulli's principle
5. Define: Reflection. Name its two kinds.
6. What is a Beaufort Scale?
II. Answer the following Marks:(2*8=16)
1. What are the differences between a tropical storm and a thunder storm?
2. State two uses of convex mirrors.
3. What are the characteristics of the image formed by a plane mirror?
4. How is a storm developed? Name any two tropical storms.
5. A convex mirror always produces erect image. But still we use concave mirrors as for shaving mirrors.
Why?
6. Explain a Tornado
7. Draw a convex mirror and label the following: a. Pole, b. Centre of curvature, c. Principal axis,
d. Radius of curvature, e. Principal focus
8. Name the instrument used to find the direction of wind. Explain it.
III. How are low and high tides formed? How do they affect the weather? Marks: 4
IV. Give Reason: Marks: 4
1. Lightining conductor should be fitted to all tall buildings.
2. Roofs blow off during heavy storms.
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