Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37oC)
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Which of the alkali metal is having least melting point? (a) Na (b) K (c) Rb (d) Cs
(d) Caesium is having the least metling point (= 312 K).
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Elements with valency 1 are (a) always metals (b) always metalloids (c) either metals or non-metals (d) always non-metals
(c) either metals or non-metals
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Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
(a) Iodine (b) Bromine (c) Graphite (d) Carbon (e) Sulphur, phosphorus (f) Oxygen
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Give two reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature.
(a) At room temperature (25 °C), water is a liquid because it has the following characteristic of liquid: (i). At room temperature, water has no shape but has a fixed volume...
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Give two reasons to justify: (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature.
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Which of the following statements is correct? a. All metals are ductile. b. All non-metals are ductile. c. Generally, metals are ductile.
(c) Generally, metals are ductile. However, mercury metal - a liquid at room temperature - cannot be drawn into wires and is not ductile.
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Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
We can see any object, when light reflected by that object reaches our eyes. But in the dark room, no light is reflected by the object so we are unable...
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Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.
(a) Alloys of metals usually have greater resistivity than that of their constituent metals. (b) Alloys usually have lower temperature coefficients of resistance than pure metals. (c) The resistivity of the alloy,...
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2 boys and 2 girls are in Room X, and 1 boy and 3 girls in Room Y. Specify the sample space for the experiment in which a room
Let us denote 2 boys and 2 girls in room X as B1, B2 and G1, G2 respectively. Let us denote 1 boy and 3 girls in room Y as...
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The temperature and the dew point in an open room are 20°C and 10°C. If the room temperature drops to 15°C,
Temp = 20°C Dew point = 10°C The place is saturated at 10°C Even if the temp drop dew point remains unaffected. The air has V.P. which is the saturation VP...
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