What is/are the benefit(s) of studying neutrinos?

1) They are the least numerous of all fundamental particles and thus provide insights on the nature of undiscovered interstellar medium.

2) They are massless and chargeless particles and thus help to understand the effects that cannot be explained by the use of electromagnetic force.

Which of the above is/are correct?

Consider the following statements.

1) A Supernova helps us know about the Universe since they are the longest existing phenomenon in 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.

Consider the following about Very High Resolution (VHR) Satellite Imagery.

1) It offers sub-centimetre resolution.

2) Any type of vehicles on road can be identified using VHR imagery.

3) Structural changes of landscapes can be easily monitored with this imagery.

Select the correct answer using the codes below.

A ramjet engine is a more efficient propulsion system for flight within the atmosphere than a rocket propulsion system because

1) A ramjet engine does not require oxygen for its operation unlike rocket engines

2) A ramjet engine does not use thrust for forward movement unlike any traditional rocket engine

Which of the above is/are correct?

Consider the following statements. The Group on Earth Observations (GEO

1) is an intergovernmental organization

2) is funded largely by the UNEP and partly by voluntary contributions

3) aims to construct a global public infrastructure for Earth observations

Select the correct answer using the codes below.