Answer the following :
Explain the construction of biogas.

Answer the following : Explain the construction of a calorimeter . Draw the necessary figure .

Answer the following question: Explain the construction of a radio telescope.

Answer the following : Explain the construction and working of a periscope with the help of a diagram .

Answer the following : Explain the construction and working of a kaleidoscope with the help of a diagram .

Answer the following questions : Explain the construction and working of an electric motor. Draw a neat diagram and label it.

Answer the following : Explain the classification of biofertilizers on the basis of their nature and functions.

Answer the following : Explain construction , working and applications of lead-acid cell , with the help of neat diagram .

Explain the construction of a radio telescope.

Answer the following Explain Sericulture.

Answer the following : Explain the process of evolution of stars .