The absolute refractive index of air is
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____________ scheme by the Central Government states that an insurance of 10 lakhs will cover each passenger traveling by Indian Rail while booking a ticket if an amount of 92paise is paid.
Which of the following is the largest mammal?
Polio is a disease caused by which of the following?
Study of earth is known as
Which of the following increased in the 1920's?
Who invented the bifocal glasses?
Who won Nobel prize for Physics in 2015?