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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 | a. Lightest and negatively charged particle in all the atoms | 1. Mendeleev |
| ii. Octave | b. Concentrated mass and positive charge | 2. Thomson |
| iii. Atomic number | c. Average of the first and the third atomic mass | 3. Newlands |
| iv. Period | d. Properties of the eighth element similar to the first | 4. Rutherford |
| v. Nucleus | e. Positive charge on the nucleus | 5. Dobereiner |
| vi. Electron | f. Sequential change in molecular formulae | 6. Moseley |
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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 a 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’ |
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(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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