What is refraction of light?
Concept: Refraction of Light
| 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 |
Concept: Refraction of Light
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?
Concept: Magnetic Force
Magnetic lines of force always cross each other
Concept: Magnetic Force
Define magnetic lines of force
Concept: Magnetic Force
What are amphoteric oxides? Give two examples of amphoteric oxides.
Concept: Types of Elements: Metals
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
Concept: Gravitation
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
Concept: Gravitation
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
|
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Choose the correct option and rewrite the statement.
The number of electrons in the outermost shell of alkali metals is _______.
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Alkaline earth metals have valency 2. This means that their position in the modern periodic table is in ___________.
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
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.
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
In which block of the modern periodic table are the nonmetals found?
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
Tell the odd one out. Give proper explanation.
Concept: Electric Circuit
Tell the odd one out. Give proper explanation.
Voltmeter, Ammeter, galvanometer, thermometer.
Concept: Electric Circuit
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
Concept: Electric Circuit
During transformation of liquid phase to solid phase, the latent heat is ______.
Concept: Latent Heat and Specific Latent Heat
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.
Concept: Refraction of Light
Write scientific reason.
Elements belonging to the same group have the same valency.
Concept: History of Periodic Table: Early Attempts at the Classification of Elements
