GATE Mechanical (ME) Test: Nuclear Power Plant - 1 Free Online Test 2026

Uranium-238 is represented by ₉₂U²³⁸. What does it represent? 

The half life of radioactive radon is 3.8 days. The time at the end of which1/20^th of the Radon sample will remain undecayed will be 

Consider the following nuclear fuels:

1. Pu²³⁹

2. U²³⁵  

3. U²³³

4. Th²³² 

What is the correct sequence of the above nuclear fuels in order of increasing half life? 

A nucleus ₉₂A²³⁵ A emits alpha and beta particles and is converted, to thenucleus ₈₂By . The total number of alpha and beta particles emitted in thereaction is 11. Their respective numbers are: 

S.l. unit for radioactivity is 

Shielding in a nuclear reactor is generally done to protect against 

Which one of the following statements is correct? The nuclear radiators produced in a reactor, which must be shielded, are: 

Which one of the following pairs of materials is used as moderators in nuclear reactors   

Match List I with List II and select the correct answer (these pertain to nuclear reactors).

Match List I (Material) With List II (Application) and select the correct answer.

Which one of the following is correct ? A nuclear reactor is said to be critical when the neutron population in the reactor core is 

Assertion (A): Pressurized water reactor (PWR) nuclear power plants use superheated steam.

Reason (R): An increase in the superheat at constant pressure increases the cycle efficiency. 

Assertion (A): The thermal efficiency of a nuclear power plant using a boiling water reactor is higher than of a plant using a pressurized water reactor.

Reason (R): In a boiling water reactor, steam is directly allowed to be generated inthe reactor itself, whereas in a pressurized water reactor, steam is generated in aseparate boiler by heat exchanger device using water of the primary circuit which absorbs the fission energy. 

Match List I with List II and select the correct answer using the codes given below the lists:

Assertion (A): A breeder reactor does not require moderator.

Reason (R): The parasite absorption of neutrons is low. 

Enriched uranium is required as fuel in a nuclear reactor, if light water isused as moderator and coolant, because light water has 

Which one of the following statements is correct ?

The mass defect is 

Which one of the following pairs is not correctly matched? 

Uranium 238 is represented as ₉₂U²³⁸ . What does it imply? 

The energy released during the fission of one atom of Uranium-235 inmillion electron volts is about