Please select a subject first
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Electrons move from ______ potential to ______ potential.
Concept: undefined >> undefined
On what factors does the electrostatic force between two charges depend?
Concept: undefined >> undefined
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What are electric lines of force?
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Exercise.
Rubbing a comb on hair makes the comb get – 0.4C.
- Find which material has lost electron and which one gained it.
- Find how many electrons are transferred in this process.
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A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is ______.
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When a beam of white light passes through a prism it gets ______.
Concept: undefined >> undefined
State whether true or false. If false, correct the statement.
If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.
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In going from a rarer to denser medium, the ray of light bends ______.
Concept: undefined >> undefined
The mirror used in search light is ______.
Concept: undefined >> undefined
The angle of deviation of light ray in a prism depends on the angle of ______.
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Match the following.
| 1. | Ratio of height of image to height of object. | Concave mirror |
| 2. | Used in hairpin bends in mountains. | Total internal reflection |
| 3. | Coin inside water appearing slightly raised. | Magnification |
| 4. | Mirage | Convex mirror |
| 5. | Used as Dentist’s mirror. | Refraction |
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a) Draw ray diagrams to show how the image is formed using a concave mirror, when the position of object is:
- at C
- between C and F
- between F and P of the mirror.
b) Mention the position and nature of image in each case.
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A device in which the loss of heat due to conduction, convection and radiation is minimized is ______.
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Ice is kept in a double-walled container. Why?
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Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
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A musical instrument is producing continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through ______.
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The sound waves travel faster ______.
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Sound is a ______ wave and needs a material medium to travel.
Concept: undefined >> undefined
