Question Discussion & Solution

Judge is a necessary part of the court for the justice.

Key Points

A binary tree is a tree data structure in which each node has at most two child nodes.

The number of subtrees of a node is called the degree of the node. In a binary tree, all nodes have degrees o, 1, and 2. 

The degree of a tree is the maximum degree of a node in the tree. A binary tree is of degree 2. The number of nodes of degree 2 in Tis "n-1".

Hence the correct answer is n-1.

Explanation:

• Bronze is an alloy of copper and tin as the two main constituent elements.
• Bronze is a copper-based alloy that typically consists of approximately 88% copper and 12% tin.
• Some other elements added in minute quantities can be aluminium, nickel or zinc.
• It is one of the first alloys used by mankind and an entire era known as the 'Bronze Age' is known because of the extensive use of the alloy in many human artefacts.

Additional Information

Steel: 

• Stainless steel is an alloy of iron and chromium.
• Steel is an alloy of iron and carbon.
• Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon, and other alloying elements.

Solder:

• Soldering is a joining process used to join different types of metals together having different properties. 
• Solder is a metal alloy, usually made up of tin and lead which is melted using a hot iron (soldering iron).
• The iron is heated to temperatures above 600˚F which then cools to create a strong bond.
• Flux material used in soldering is ZnCl2 (Zinc Chloride) and NH4Cl (Ammonium Chloride).

Brass:

• Brass is a metal alloy that is made up of copper and zinc.
• The proportions of zinc and copper can vary to create different types of brasses with different properties.
• It has higher malleability than bronze or zinc and has a relatively low melting point (900 to 940 °C).

Mistake Points

• Copper was the first metal used by men.
• Copper was first used by man over 10,000 years ago.  
• Probably copper can be found as a naturally occurring native metal that is sometimes found in large lumps on the ground.
• People learned to make this into copper tools and other things, although, for a metal, it is quite soft.
• When it was melted over the fire, people learned how to make an alloy called bronze, which is much harder and stronger than copper.

The correct answer is Indicator.

Key Points

• Indicators are substances that show a change in colour when brought in contact with acids and bases.
• The most common indicator used in the laboratory is Litmus.
• Litmus is extracted from lichens.

Additional Information

• A promoter is a sequence of DNA needed to turn a gene on or off.
• A neutralizer is a substance used in the neutralization of acidic water.
• Neutralization is a chemical reaction in which acid and a base react quantitatively with each other to form water and salt.
• A catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the reaction.

The correct answer is Vitamin A.

• Vitamin A causes Night Blindness.

Key Points

• Night blindness is a type of vision impairment also known as nyctalopia. People with night blindness experience poor vision at night.
• Vitamin was first invented by FG Hopkins.  However, the term vitamin was coined by C Funk. 
• Good sources of vitamin A include cheese, eggs oily fish.

Additional Information

• Vitamin B₁₂ deficiency may lead to a reduction in healthy red blood cells (anaemia). 
• Vitamin C is found in citrus fruits and vegetables.
  • Scurvy results from a deficiency of vitamin C in the diet.
• The signs and symptoms of vitamin D deficiency include Fatigue, Bone pain, muscle weakness, muscle aches, or muscle cramps.
  • Rickets is caused due to deficiency of vitamin D
• Vitamin E deficiency can cause nerve and muscle damage loss of body movement control, muscle weakness, and vision problems.