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प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
Graphite is used in making filaments of electric bulb.
पर्याय
True
False
उत्तर
False.
Tungsten is used in making filaments of electric bulb.
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संबंधित प्रश्न
Give an example of a metal which can be easily cut with a knife.
Name the non-metal which is used as a rocket fuel (in liquid form).
State one use of Sulphur.
Name a metal which is so soft that it can be cut with a knife.
Write ‘true’ or ‘false’ for the following statement
Sodium can be cut with a knife.
Name the non-metal and its natural form, which is the hardest substance.
Name a non-metal which is good conductor of electricity.
State two important uses of following non-metal
Uses of oxygen
Name:
the compound responsible for green deposit on the surface of copper
Name:
a non metal which can form a positive ion
Identify the odd term.
Name a metal which does not corrode easily.
Match the following:
| Column A | Column B |
| (a) Helium | (1) Electric bulb |
| (b) Neon | (2) Thermometer |
| (c) Argon | (3) Semiconductor |
| (d) Germanium | (4) Weather balloons |
| (e) Mercury | (5) Advertising signboards |
Distinguish between the physical properties of metals and non-metals with reference to:
(a) lusture (b) malleability (c) ductility (d) tensile strength (e) sonority (f) conduction of heat and electricity (g) melting and boiling point (h) density.
Differentiate between metals and non-metals with reference to –
(a) number of electrons in outer or valence shell
(b) formation of cation and anion
(c) reaction with dilute acids.
Complete the statement given below, by filling in the blank with the correct word:
The ability of a metal to produce a reasonant sound ______.
Give reason for the following:
Rusting reduces the structural strength of iron.
Write the name.
The reagent which dissolves noble metals.
Give two examples of alloy.
Reason out
Mercury is the only metal that is liquid at room temperature.
