Challenge Prelims V1.0 – Day 71 – GS Paper (Science and Technology)

1. Consider the following statements with respect to India’s first Scorpene Submarine, INS Kalvari :

1. It is India’s first indigenous stealth submarine.
2. It is built as part of the ‘Project-75’ of the Indian Navy.
3. It is a nuclear powered submarine.

How many of the statements given above is/are correct?

2. With reference to moderators used in nuclear reactors consider the following statements:

1. Moderators made out of neutron-absorbing material are used to control rate of the nuclear reaction.
2. Graphite is used as a moderator in nuclear reactions.

Which of the statements given above is/are correct?

3. With reference to ‘Territorial Army’, which of the following statements is/are correct?

1. It is a voluntary military force of civilians which is a part of the regular Indian Army.
2. It assists civil administration in maintenance of essential services.

Select the correct answer using the code given below.

4. Consider the following statements:

1. Photovoltaic cell converts the light energy into electrical energy.
2. China has become the first country to construct a photovoltaic highway.

Which of the statements given above is/are correct?

5. A device called ‘core catcher’ was installed in the Kudankulam nuclear plant. In this context, consider the following statements:

1. A core catcher is a device that supplements the work of the moderators by further slowing down the speed of neutrons in a nuclear reactor.
2. It is made up of materials different from that of the moderator.

Which of the statements given above is/are correct?

6. Consider the following statements regarding Thorium:

1. It is largely imported in India to meet nuclear energy demands.
2. Its deposits in India mainly occur in the Vindhyan system of rocks.
3. It can be directly used as fuel in a nuclear reactor.

How many of the statements given above is/are correct?

7. Which of the statements is/are correct regarding the recently conducted Coastal Defence Exercise – Sea Vigil 21?

1. It is a tri–service exercise involving assets of the Indian Navy, Indian Army and Indian Air Force.
2. It is undertaken along the entire coastline including the Exclusive Economic Zone (EEZ) of the country.

Select the correct answer using the code given below.

8. How many of the following is/are the advantages of Lithium-ion batteries over traditional batteries such as Nickel-cadmium (NiCad) batteries?

1. Lithium-ion batteries are smaller in size, require less maintenance, and are environmentally safer.
2. Lithium-ion batteries are cheaper.
3. Lithium-ion has virtually no self-discharge.

Select the correct answer using the code given below.

9. Consider the following statements with reference to radioactive emissions:

1. All radioactive emissions are electrically neutral.
2. Among the radioactive emissions, gamma rays have the highest penetration power

Which of the statements given above is/are correct?

10. With reference to different geoengineering technologies, consider the following statements:

1. Solar geoengineering is used to reflect sunlight back into space by using sulfates.
2. LOHAFEX is an ocean iron fertilization experiment to see if iron can cause algal bloom and trap carbon dioxide from the atmosphere.
3. SPICE is a project aimed to assess the feasibility of injecting particles into the stratosphere from a tethered balloon to manage solar radiation.

How many of the statements given above is/are correct?

11. With reference to the recently commissioned INS Vela, consider the following statements:

1. It is the fourth stealth Scorpene-class submarine under Project 75 in partnership with France.
2. It is a diesel-electric powered attack submarine with a silent Permanently Magnetised Propulsion Motor.

Which of the statements given above is/are correct?

12. Consider the following statements regarding Hypersonic missiles:

1. A hypersonic missile is a weapon system which flies at least at the speed of Mach 2.
2. Hypersonic missiles cannot be manoeuvred to the intended target.
3. Conventional hypersonic weapons use only kinetic energy to destroy unhardened targets.

How many of the statements given above are correct?

13. Consider the following statements:

1. A ramjet is a form of air-breathing jet engine that uses the vehicle’s forward motion to compress incoming air for combustion.
2. A scramjet is a type of ramjet airbreathing jet engine where combustion occurs in supersonic airflow.
3. Ramjets work most efficiently at hypersonic speeds.

How many of the statements given above are correct?

14. Consider the following statements with reference to the Fast Breeder Reactor:

Statement-I: Fast Breeder reactors can help extract up to 70 percent more energy than traditional reactors and are safer than traditional reactors.

Statement-II: The spent fuel from this reactor cannot be fed back into the reactor.

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

15. In the context of Indian defence, consider the following pairs:

Missiles: Description

1. Rudram: Long-range guided-bomb
2. Gaurav: Anti-radiation missile
3. BrahMosNG: Supersonic cruise missile

How many of the above pairs are correctly matched?