Physics · Science and Technology · UPSC Civil Service

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?

In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

1. Area of the hole in the lid

2. Temperature of the flame

3. Weight of the lid

Select the correct answer using the code given below.