- Without any change in the weight of the nail
- With decrease in the weight of the nail
- With increase in the weight of the nail
- Without any change in colour or weight of the nail
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When carbon in the cast iron is principally in the form of graphite, the cast iron will be of?
Answer: Option 4 Let'
1 Answers 1 views
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.?
Answer: Option 2 When filing or machining cast iron makes our hands black, then it shows that free graphite is present in cast iron.
1 Answers 1 views
__________ iron is produced, when molten pig iron is allowed to cool gradually.?
Answer: Option 2 Let'
1 Answers 1 views
__________ iron is produced, when molten pig iron is chilled suddenly.?
Answer: Option 1 Let'
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When iron is rusted, it is?
Answer: Option 3 Let'
1 Answers 1 views
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.?
Answer: Option 3 Let'
1 Answers 1 views
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?
Answer: Option 3 Newton's third law supports this statement. When the wooden block is not resting against a support, the block and nails both move forward on being hit with a...
1 Answers 1 views
Which among the following metals provides amphoteric oxide ?
Answer: Option 3 In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc,...
1 Answers 1 views
Which metal does not undergo corrosion due to the formation of oxide layer?
Answer: Option 3 Corrosion is an oxidation reaction with atmospheric oxygen in the presence of water on the surface of a metal. Iron corrodes more quickly than most other transition...
1 Answers 1 views
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is?
Answer: Option 1 Below 773°C (1,423°F), alpha iron becomes ferromagnetic (i.e., capable of being permanently magnetized), indicating a change in electronic structure but no change in crystal structure.
1 Answers 4 views