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Write a scientific reason.
The coin disappears in a vessel as it is seen from a specific location. But as soon as the water is poured into the vessel to a certain level, the coin appears.
Concept: undefined >> undefined
Write scientific reason.
A pencil appears to be broken near the surface of water.
Concept: undefined >> undefined
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Observe the given figure and name the following.

| Ray AB | |
| Ray NM | |
| Ray MD | |
| ∠ r |
Concept: undefined >> undefined
Observe the given figure and write appropriate phenomenon of light in the box.

Concept: undefined >> undefined
In refraction of light through a glass slab, the directions of the incident ray and the refracted ray are ______.
Concept: undefined >> undefined
Tungsten wire is used in electric bulbs.
Concept: undefined >> undefined
What are artificial satellites?
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Name the first artificial satellite sent to space.
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Fill in the blank:
The modern periodic table consists of ……………. periods.
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When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
(a) bends towards normal
(b) bends away from normal
(c) passes unbent
(d) passes in zigzag way
Concept: undefined >> undefined
Explain how spectrum is formed.
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When rays of light are incident on a glass slab then the incident ray and emergent ray are _________ each other.
- perpendicular
- parallel
- opposite
- concurrent
Concept: undefined >> undefined
State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?
Concept: undefined >> undefined
Choose the correct alternative and rewrite the following sentence.
A ray of light strikes the glass slab at an angle of 50°. What is the angle of incidence?
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Write a short note on dispersion of light.
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Define refraction and state the laws of refraction.
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Explain how the formation of a rainbow occurs.
Concept: undefined >> undefined
State the rule to determine the direction of a magnetic field produced around a straight conductor-carrying current.
Concept: undefined >> undefined
