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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
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State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?
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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.
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State the rule to determine the direction of a magnetic field produced around a straight conductor-carrying current.
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Why do we get a spectrum of seven colors when white light is dispersed by a prism?
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State the right-hand thumb rule.
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Write the merits of the modern periodic table over Mendeleev’s Periodic table
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Draw the diagram of refraction of light in the glass slab
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Observe the following figure and answer the questions given under it:
1) How many times does refraction take place in the above figure?
2) What happens to the ray of light when it passes from air to glass?
3) What happens to the ray of light when it passes from glass to air?
4) What are the rays AB and CD in the figure called?
5) Define refraction.
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Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
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What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
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Tell the odd one out. Give proper explanation.
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Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
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| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
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Write a short note.
Structure of the modern periodic table.
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