Question Discussion & Solution

1. Some students can either be mischievous or Intelligent.

2. Some Intelligent person can either be mischievous or students.

Thus there are some relation between all the three i.e students, intelligent and mischievous

Now, according to this, the most suitable Venn diagram is-

Hence, Option (4) is correct.

Additional InformationMischievous: A person likes to have fun by playing harmless tricks on people or doing things they are not supposed to do.

The correct answer is Subscript.

Key Points

• CTRL+EQUAL SIGN Apply subscript formatting.
• CTRL+SHFT+PLUS SIGN Apply superscript formatting.

Additional Information

• CTRL+SHFT+> Increase the font size.
• CTRL+SHFT+< Decrease the font size.
• CTRL+] Increase the font size by 1 point.
• CTRL+[ Decrease the font size by 1 point. 

Option - 1 - Stream - A stream is a body of water with surface water flowing within the bed and banks of a channel.

Option - 2 - Canal - Canals are waterways channels, or artificial waterways, for water conveyance, or to service water transport vehicles.

Option - 3 - Brook - A small stream.

Option - 4 - Bridge - A bridge is a structure built to span a physical obstacle, such as a body of water, valley, or road, without closing the way underneath.

All except bridge contain water.

The correct answer is Badminton.

 Key Points

• Uber Cup, trophy representing the women's world championship in the sport of badminton.
• The cup was contributed by Mrs H.S. Uber, the former English champion, in 1956 for a series of women's international team competitions to be held every three years.

 Important Points

• The Thomas Cup, sometimes called the World Men's Team Championships, is an international badminton competition among teams representing member nations of the Badminton World Federation (BWF).
• Important Cricket Tournaments in India:  the Ranji Trophy, the Duleep Trophy, the Vijay Hazare Trophy, the Deodhar Trophy, the Irani Trophy and the NKP Salve Challenger Trophy.

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.