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प्रश्न
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
पर्याय
chromium
germanium
gallium
potassium
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उत्तर
germanium
Germanium is metalloid. It is neither a good conductor of electricity nor an insulator. It is a semiconductor.
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संबंधित प्रश्न
Name the terms for the change of vapour into a liquid.
Name two processes which provide the best evidence for the motion of particles in matter.
What are the characteristics of matter?
Which type of elements, metals or non-metals, show the property of brittleness ?
What is meant by saying that metals are malleable and ductile ?
What are the two types of pure substances? Give one example of each type.
Give reason why copper metal is used for making electric wires.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
“Is malleable and ductile” best describes :
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Which of the following is not an emulsion ?
Which of the following can be called a suspension ?
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Solids do not flow.
