With reference to radioisotope thermoelectric generators (RTGs), consider the following statements :

1. RTGs are miniature fission reactors.

2. RTGs are used for powering the onboard systems of spacecrafts.

3. RTGs can use Plutonium-238, which is a by-product of weapons development.

Which of the statements given above are correct ?

Recently, the term “pumped-storage hydropower” is actually and appropriately discussed in the context of which one of the following?

Consider the following statements :

Statement-I : India, despite having uranium deposits, depends on coal for most of its electricity production.

Statement-II : Uranium, enriched to the extent of at least 60%, is required for the production of electricity.

Which one of the following is correct in respect of the above statements? 

Consider the following statements:

1. In a seismograph, P waves are recorded earlier than S waves.

2. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation.

Which of the statements given above is/are correct?