Question Discussion & Solution

Logic:

Train, Bus, and Boat are all vehicles,

Whereas a wheel is not a vehicle but a part of it.

Hence, "Wheel" is the odd word.

Pack is a group of Wolves.

Similarly,

Battery and Engine are part of car but battery and engine are two different entity.

Therefore, above diagram best express relationship between Battery, Engine and Car.

CONCEPT:

• The pressure cooker is based on the principle that the boiling of water increases with the increase in pressure.

EXPLANATION:

• When we give heat to the pressure cooker then due to an increase in temperature the steam generated in the vessel.
• Due to this generated steam, the pressure inside the vessel increases. So the food gets cooked soon.
• Thus by the application of pressure the boiling point of the water increases. Hence option 1 is correct.
• There is no relation between food-grains with the boiling point of water. So options 2, 3, and 4 are wrong.

The correct answer is Copper.

Key Points

• Conductor of electricity
  • In physics and electrical engineering, a conductor is an object or type of material that allows the flow of charge in one or more directions.
  • Materials made of metal are common electrical conductors. 
  • Copper is considered to be a conductor because it conducts the electron current or flow of electrons fairly easily. Most metals are considered to be good conductors of electrical current. Copper is just one of the more popular materials that are used for conductors. Hence, Option 4 is correct.
  • If you have to define the meaning of electrical conductors in the simplest way, they are materials that allow electricity to flow through them easily.
  • If we compare two types of material and the first one allows better flow of electricity through it, then that material is said to be a good conductor of electricity.
  • An electrical conductor allows the electric charges to easily flow through them. The property of conductors to conduct electricity is called conductivity.
  • Such materials offer less opposition or resistance to the flow of charges.
  • Conducting materials allow easy charge transfer because of the free movement of electrons through them.

Additional Information

• • Some examples of conductors of electricity are
    • Copper
    • Aluminum
    • Silver
    • Gold
    • Graphite
    • Platinum
    • Water
    • People