Class-10,Metals and Non-metals

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Q1) Pyrolusite is an ore of: *

1 point

Q2) The following metals exist in their native state: *

1 point

Pt, Au, Ag

Ne, He, Ar

Fe, Ag, Au

All of these

Q3) Which process is used for the enrichment of oxide ores? *

1 point

Magnetic separation

Froth floatation

Hydraulic washing

Chemical reduction

Q4) Which of the following alloy is used for joining metals for electrical work? *

1 point

Amalgum

Solder

Bronze

German Silver

Q5) Galvanisation process involves elements zinc and iron. Which of the two metals is sacrificing its life to save the life of the other? *

1 point

None of these

Both sacrifice each other’s life

Q6) Iron pillar at Delhi is made up of: *

1 point

Wrought Iron

Peat Iron

Mixture of both peat and wrought

None of these

Q7) “Ringing of bell in the temple” is associated with which property of metal: *

1 point

Brittle

Ductility

Malleability

Sonorous

Q8) The melting point of NaCl is: *

1 point

1074K

1047K

100K

1000K

Q9) Which element is stored in water and which element is stored in kerosene? *

1 point

Phosphorus and sodium respectively

Magnesium and sodium respectively

Calcium and phosphorus respectively

Sodium and phosphorus respectively

Q10) Metal which is liquid at room temperature is: *

1 point

Silver

Sodium

Lead

Mercury

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