Carbon and its Compounds — Science STD 10 — Question

What colours lie on the two sides of the ‘green colour’ in the spectrum of white light?

By how much time the day would have been shorter if the earth had no atmosphere?

What name is given to the device which automatically cuts off the electricity supply during short-circuiting in household wiring?

Name three elements that have a single electron in their outermost shells.

Name the organ which produces female sex cells.

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka - boron, eka - aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

Find the odd one out: Actin, Ossein, Myosin, Melanin

A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

Where are hormones made in the human body?

What are the four blood groups in humans?