VIII. Answer the following (any nine):-
1) State three characteristics of an image formed by a pinhole camera?
2) Name four devices which use artificial magnets.
3) Why are fluorescent tube lights called shadowless lights?
4) What are the kinds of optical medium? Define with example.
5) State three properties of a bar magnet.
6) Define magnetic lines of force?
7) How is the image formed in pinhole camera affected when -
i. The distance of screen from the pinhole increases.
ii. The distance of the object from the pinhole increases.
8) Where is the earth's magnetic field :
i. Strongest
ii. Weakest
9) When the extended source of light is smaller than the opaque body
how are the umbra and penumbra shadows affected when the screen is
moved away from the opaque body?
10) How is a solar eclipse seen? Explain
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✮ Appropriate Question ✮
- What are the characteristics of magnetic line force
✮ Required Answer ✮
- General Properties of Magnetic Lines of Force
- They never cross one another. They all have the same strength. Their density decreases (they spread out) when they move from an area of higher permeability to an area of lower permeability. Their density decreases with increasing distance from the poles.
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