Question : In arc welding, argon is used because of its
Option 1: low reactivity with metal
Option 2: ability to lower the melting point of the metal
Option 3: high flammability
Option 4: high calorific value
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Correct Answer: low reactivity with metal
Solution : The correct option is low reactivity with metal.
Arc welding is a type of welding in which an electric arc is formed between an electrode and the workpiece, melting the metal at the joint and forming a weld. Argon's low reactivity and inert nature make it an excellent shielding gas in Arc welding.
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Question : The nature of fuse wire is
Option 1: high resistance and low melting point.
Option 2: high resistance and high melting point.
Option 3: low resistance and high melting point.
Option 4: low resistance and low melting point.
Question : For photoelectric effect to take place, the metal used as the cathode should have_________
Option 1: high melting point
Option 2: low melting point
Option 3: low work function
Option 4: low resistance
Question : Supercooling is the cooling of liquid _________.
Option 1: below melting point
Option 2: below freezing point
Option 3: at melting point
Option 4: above melting point
Question : Super cooling stands for cooling of a liquid:
Option 1: at freezing point
Question : Phosphorus is kept in water because
Option 1: Its ignition temperature is very high.
Option 2: Its ignition temperature is very low.
Option 3: Its critical temperature is high.
Option 4: Its critical temperature is low.
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