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Consider the followingstatements.
1.ASupernovahelps us knowaboutthe Universesincetheyarethelongestexistingphenomenonin space.
2.Pulsars are de-magnetized neutron stars that neither rotate nor emit electromagnetic radiation.
3.Black hole refers to the remains of a supergiant star that has collapsed into itself.
4.The effects of microgravity can be seen when astronauts and objects float in space.
Select the correct answer using the codes below.
1 and 3 only
3 and 4 only
2 , 3 and 4 only
1, 2 and 4 only
China has launched its first X-ray space telescope to study black holes, pulsars and gamma-ray bursts.
Justification: Statement 1: Asupernovahappenswherethere is achange in thecore, or centre, of a star.
A supernova burns for only a short period of time, but it can tell scientists a lot about the universe. Onekindof supernovahasshownscientiststhatweliveinanexpandinguniverse,onethatis growing at an ever increasing rate.
Statement 2: Pulsarsarehighlymagnetized, rotatingneutronstarsthatemitabeamof electromagnetic radiation.
They are spherical, compact objects that are about the size of a large city but contain more mass than that of the sun.
Scientists are using pulsars to study extreme states of matter, search for planets beyond Earth’s solar system and measure cosmic distance.
Statement 3: A black hole cannot be seen because of the strong gravity that is pulling all of the light into the black hole's centre. However,scientistscanseetheeffectsofitsstronggravityonthestarsandgasesaroundit. Ifastar isorbitingacertainpointinspace,scientistscanstudythestar'smotiontofindoutif it is orbiting a blackhole.
Statement 4: Microgravity is the condition in which people or objects appear to be weightless. This occurswhen gravitationforcearoundisweak(butnotzero)orwhenobjectsareinastateoffree fall (as in asatellite).
For example, astronauts can move equipment weighing hundreds of pounds with their fingertips due to microgravity.
By: kamaljeet kaur ProfileResourcesReport error
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