Epsom salt is a hydrate of which of the following?

Continuous bleeding from an injured part of the body is due to the deficiency of:

An observer moves towards a stationary source of sound with a velocity of one-fifth of the velocity of sound. The percentage increase in the apparent frequency is (in $\%$)

Which of the following statements is correct?

Venus appears brighter than other stars because

The orbit of a geo-stationary satellite is circular. The time period of the satellite depends on:
$(i)$ mass of the satellite
(ii) mass of the earth
(iii) radius of the orbit
(iv) height of the satellite from the surface of the earth
Which of the following is correct?