Pure iron is soft and stretches easily when hot (a) How does this property of iron change when: (i) small amount of carbon is mixed with it? (ii) nickel and chromium are mixed with it? (b) Define an alloy. How is an alloy prepared? (c) An alloy has low melting point and is therefore used for electrical fuse. Name the alloy and write its constituents.

What type of questions asked from the lesson of magnetic effect of electric current 

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?