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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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A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?
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Magnetic lines of force always cross each other
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Define magnetic lines of force
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The masses of the earth and moon are 6 × 1024 kg and 7.4 × 1022 kg, respectively. The distance between them is 3.8 × 105 km. Calculate the gravitational force of attraction between the two?
Use G = 6.7 × 10–11 N m2 kg–2
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The mass of the earth is 6 × 1024 kg. The distance between the earth and the sun is 1.5 × 1011 m. If the gravitational force between the two is 3.5 × 1022 N, what is the mass of the sun? Use G = 6.7 × 10–11 N m2 kg–2
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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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During transformation of liquid phase to solid phase, the latent heat is ______.
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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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Explain the following temperature vs time graph.
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What is meant by latent heat? How will the state of matter transform if latent heat is given off?
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