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What is refraction of light?
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| Column I | Column II | Column III | |
| 1 | Dispersion | Long-sightedness | Twinkling of stars |
| 2 | Refraction | Splitting of white light into component colours | Convex lens |
| 3 | Hypermetropia | Change in the direction of the ray of light due to change in medium | Spectrum of seven colours |
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Rearrange the columns 2 and 3 so as to match with the column 1.
| Column 1 | Column 2 | Column 3 |
| i. Triad ii. Octave iii. Atomic number iv. Period v. Nucleus vi. Electron |
a. Lightest and negatively charged particle in all the atoms b. Concentrated mass and positive charge c. Average of the first and the third atomic mass d. Properties of the eighth element similar to the first e. Positive charge on the nucleus f. Sequential change in molecular formulae |
1.Mendeleev
2. Thomson
3. Newlands
4. Rutherford
5. Dobereiner
. Moseley
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Choose the correct option and rewrite the statement.
The number of electrons in the outermost shell of alkali metals is _______.
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Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ______.
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The molecular formula of the chloride of element X is XCl. This compound is a solid having a high melting point. Which of the following elements be present in the same group as X.
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In which block of the modern periodic table are the nonmetals found?
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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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Fill in the blank and Explain the completed sentences.
The change in ______ of light rays while going from one medium to another is called refraction.
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How does the short circuit form? What is its effect?
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We can see the sun even when it is little below the horizon because of ______.
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Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
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Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
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Observe the following figure which bulb get fuse?
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Choose and write the correct option.
If we gradually increase the angle of incidence of a ray of light passing through prism then …..
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By considering first correlation complete the second correlation:
Hubble telescope: 569 km high from the earth surface
Revolving orbit of Hubble telescope: ______
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Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
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What is meant by space debris?
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Match the column ‘A’ with column ‘B’.
|
Column ‘A’
|
Column ‘B’ |
|
(1) Eka - boron
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(a) Germanium
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|
(2) Eka - Aluminium
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(b) Scandium
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(3) Eka - Silicon
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(c) Gallium |
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