Question
How are plants classified?
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An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
- Name the element E.
- What is allotrope A.
- What is allotrope B?
- What is allotrope C?
- Which allotrope is used in making jewellery?
- Which allotrope is used in making anode of a dry cell?
Liquid ammonia is used in ice factory for making ice from water. If water at 20 °C is to be converted into 2 kg, ice at 0 °C, how many grams of ammonia is to be evaporated?
(Given: The latent heat of vaporization of 1 ammonia = 341 cal/g)
(Given: The latent heat of vaporization of 1 ammonia = 341 cal/g)
Write short notes on the following: Anodizing.
(OR)
Identify the process shown in the above diagram and explain it in brief.
(OR)
Identify the process shown in the above diagram and explain it in brief.
Observe the following figure and write the answer of the question.
- Which process is shown in the figure?
- Explain the chemical reaction shown in the figure.
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What is meant by a satellite launch vehicle? Explain the satellite launch vehicle developed by ISRO with the help of a schematic diagram.
Calculate the critical velocity of the satellite to be located at 35780 km above the surface of earth.
Observe the following figure and answer the questions.
(a) Which optical instrument shows arrangement of lenses as shown in the figure?
(b) Write in brief the working of this optical instrument.
(c) How can we get different magnifications in this optical instrument?
(d) Draw the figure again and labelled it properly.
(a) Which optical instrument shows arrangement of lenses as shown in the figure?
(b) Write in brief the working of this optical instrument.
(c) How can we get different magnifications in this optical instrument?
(d) Draw the figure again and labelled it properly.
Observe the figures given below and answer the given questions:
(a) In which phylum are these animals included?
(b) Which substance forms the outer layer of their exoskeleton?
(c) What are their locomotory organs?
(a) In which phylum are these animals included?
(b) Which substance forms the outer layer of their exoskeleton?
(c) What are their locomotory organs?
Write short notes on: Leaching method
Explain the principle of dialysis with the help of a labelled diagram.