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Electric cells having 2V potential difference each have been connected in the form of a battery. What will be the total potential difference of the battery in both cases?
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An object moves 18 m in the first 3 s, 22 m in the next 3 s and 14 m in the last 3 s. What is its average speed?
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A bullet having a mass of 10 g and moving with a speed of 1.5 m/s, penetrates a thick wooden plank of mass 900 g. The plank was initially at rest. The bullet gets embedded in the plank and both move together. Determine their velocity.
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A person swims 100 m in the first 40 s, 80 m in the next 40 s and 45 m in the last 20 s. What is the average speed?
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Two samples ‘m’ and ‘n’ of slaked lime were obtained from two different reactions. The details about their composition are as follows:
- ‘sample m’ mass: 7g
- Mass of constituent oxygen: 2g
- Mass of constituent calcium: 5g
- ‘sample n’ mass: 1.4g
- Mass of constituent oxygen: 0.4g
- Mass of constituent calcium: 1.0g
Which law of chemical combination does this prove? Explain.
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Hydrochloric acid
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Sodium chloride
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Potassium hydroxide
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Ammonia
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Acetic acid
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Show the dissociation of the following compound on dissolving in water, with the help of a chemical equation and write whether the proportion of dissociation is small or large.
Magnesium chloride
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Show the dissociation of the following compound on dissolving in water, with the help of chemical equation and write whether the proportion of dissociation is small or large.
Copper sulphate
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Write note.
Meteorology
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Write note.
Monsoon model
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Write a note on:
Root pressure
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Write a note on:
Transpiration
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Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
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The following statement is wrong. Rewrite it correctly by changing either one or two words.
Simple squamous epithelium is present in respiratory tract.
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The following statement is wrong. Rewrite it correctly by changing either one or two words.
Glandular epithelium is present in kidneys.
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Explain the construction of Galileo’s telescope.
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