Question Discussion & Solution

The logic is,

In the first image, there are six lines in the first column and there is a four-sided figure in the second column.

In the second image, there are eight lines in the first column and there is a six-sided figure in the second column.

So, it means that the number of sides of a figure in the second column is decreasing by two from the number of lines in the first column.

Since, in third image there are five lines so the answer figure must be a three-sided figure.

Thus, the correct figure is as follows:

Hence, he is moving in north direction now.

If '+' means 'divide by', '-' means 'add to', '×' means 'subtract from' and '/' means 'multiply by',

{(16 × 6) - (2 / 3)} + (3 - 1)] / 2

Now put the right symbol we get-

= [{(16 - 6) + (2 × 3)} / (3 + 1)] × 2

Now we apply BODMAS rule-

= [{10 + 6} / 4] × 2

= [16 / 4] × 2

= 4 × 2

= 8

Hence, "8" is the correct answer.

CONCEPT:

Nuclear reactor:

• It is a device in which a nuclear reaction is initiated, maintained, and controlled.
• It works on the principle of controlled chain reaction and provides energy at a constant rate.

EXPLANATION:

• Nuclear Fuel: It is a fissionable material to be used for the fission process to take place. Therefore option 1 is correct.
• Commonly used fuels in a nuclear reactor are U233, Enriched U235, Pu239 etc. 
• Generally, uranium oxide pellets are inserted end to end into long hollow metal tubes constituting the fuel rods.
• When slow neutrons interact with the fuel, the fission starts, and the energy is released. 

Additional Information

• The moderator's function is to slow down the fast-moving secondary neutrons produced during the fission.
  • The material of the moderator should be light and it should not absorb neutrons.
  • Usually, heavy water, graphite, deuterium, and paraffin, etc. can act as moderators.
• Controller: These are made with neutron-absorbing material such as cadmium, hafnium or boron, and are inserted or withdrawn from the core to control the rate of reaction, or to halt it. 
• Lubricant: Lubricant has shown that it is possible to produce materials capable of lubricating some reactor components.
  • In order to further the development of such lubricants, the U.K.A.E.A. and the nuclear manufacturing groups have co-operated in providing lubricant manufacturers.

The correct answer is A) 4, B) 2, C) 1, D) 3.

Key Points

• Sodium - It can be simply cut with knife as a result of Sodium has one negatron in its valence shell. Being the primary part of that amount, it is giant size.
• Mercury is liquid at temperature. A heavy, silvery d-block component, mercury is that the solely metal that's liquid at customary conditions for temperature and pressure.
• Silver is that the sensible conductor of electricity as a result of it contains the next variety of movable atoms (free electrons). For a fabric to be an honest conductor, the electricity more experienced it should be able to move the electrons.
• Lead being metal may be a dangerous conductor of electricity and warmth. Compared to alternative metals, lead may be a poor conductor of warmth whereas gold, silver, Pt square measure sensible conductors of warmth.