Mars has about (i) the gravity of Earth while Pluto has about (ii) the gravity of Earth. Select the option which correctly fills the blanks.
The Soyuz is a Russian spacecraft which is like a lifeboat for the space station. At least one Soyuz is always docked at the space station. Which of the following statements are correct about Soyuz ?
(i) It carries people and supplies to and from the space station.
(ii) The crew rides in the part of the spacecraft called a capsule.
(iii) Upto three astronauts or cosmonauts can ride in a Soyuz capsule.
A(i) and (ii)
B(ii) and (iii)
C(i) and (iii)
D(i), (ii) and (iii)
Which of the following statements is correct about the galaxy Milky Way ?
ALess than 10% of the mass of the Milky Way is visible.
BSpitzer Space Telescope is an infrared telescope used in mapping and studying the Milky Way galaxy.
CMilky Way is a part of the Virgo supercluster, a group of galaxies within 150 million light years.
DAll of these
An element is a substance that cannot be chemically interconverted or broken down into simpler substances. Which of these is an element?
it should be A. if hydrogen cannot be broken then what is hydrogen peroxide