Question Discussion & Solution

Explanation:

Trend in metallic property:

• As we move along a period from left to right, the metallic character decreases. The elements which are at the extreme left of the periodic table are most metallic in nature and the elements at the right side of the periodic table are non-metals in nature.
• As we go down the group, the metallic character increases and the non-metallic character decreases.
• So, metals at the extreme left and bottom of the periodic table are most metallic in nature.

Reactivity:

• As the metallic character increases, the Ionisation potential decreases and the reactivity of the elements also increases.
• The most reactive metal is thus Cs (Cesium), situated at the bottom left corner of the periodic table.

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Hence, the most active metal known is Cesium.

• Francium is the element present at the bottom of the periodic table, but it is a lab-made element, and not naturally occurring, which makes Cs as the most reactive element. 

The correct answer is Santosh Ahlawat.

• Santosh Ahlawat is the first woman Member of Parliament from Jhunjhunu.

Key Points

• Santosh Ahlawat is the first woman Member of Parliament from the Jhunjhunu constituency.
• She is associated with the Bharatiya Janata Party.

Additional Information

• Kamala Beniwal served as the Governor of Mizoram, Gujarat, and Tripura.
  • She is the first woman Governor of any northeastern state.
• Tara Bhandari was the deputy speaker of the Rajasthan Legislative Assembly in 1998.
  • Her constituency is Sirohi.
• Lakshmi Barupal is a Member of the Legislative Assembly Desuri constituency.

The pattern followed is,

Accident can cause Injury.

Similarly,

Infection can cause Disease.

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 option 1.

Concept:

The auto storage class is the default storage class for all local variables. The variables defined using the auto storage class are called local variables. Auto stands for automatic storage class. A variable is in the auto storage class by default if it is not explicitly specified. The scope of an auto variable is limited to the particular block only.

Storage Classes:

Storage Classes are used to describe the features of a variable/function. These features basically include the scope, visibility, and lifetime which help us to trace the existence of a particular variable during the runtime of a program. C language uses 4 storage classes.

Hence the correct answer is auto.