Please select a subject first
Advertisements
Advertisements
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?
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Advertisements
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?
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
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
Concept: undefined >> undefined
Write note.
Meteorology
Concept: undefined >> undefined
Write note.
Monsoon model
Concept: undefined >> undefined
Write a note on:
Root pressure
Concept: undefined >> undefined
Write a note on:
Transpiration
Concept: undefined >> undefined
Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
Concept: undefined >> undefined
The following statement is wrong. Rewrite it correctly by changing either one or two words.
Simple squamous epithelium is present in respiratory tract.
Concept: undefined >> undefined
The following statement is wrong. Rewrite it correctly by changing either one or two words.
Glandular epithelium is present in kidneys.
Concept: undefined >> undefined
Explain the construction of Galileo’s telescope.
Concept: undefined >> undefined
Study the figure and answer the following questions.
- What type of telescope is shown in the figure?
- Label the main parts of the telescope.
- Which type of mirror does the telescope use?
- What other type of telescope uses a curved mirror?
- Explain the working of the above telescope.
Concept: undefined >> undefined
