Rahul S

Books & Online Resources

1. Book: Lucent or Arihant. Generally Lucent is the preferred one
2. Online Notes: Comprehensive notes are available on SSC PORTAL : SSC CGL, CHSL, Exams Community.
3. Video Lectures: VIDYA GURU Institute Youtube Channel has excellent videos on GK & GS preparation for SSC CGL. I suggest you subscribe.
4. Past Year Papers: There is a wonderful collection of SSC past exam papers on SSC PORTAL : SSC CGL, CHSL, Exams Community. Don’t miss them.

One of the most important thing now is to know about which book is the best for SSC CGL Preparation.

1. Advance maths for General Competitions by Rakesh Yadav KD
2. Arithmetic for General Competitions by Neetu Singh KD Publications
3. General Knowledge by Dr. Binary Karn Lucent
4. India Year Book by Publications Division, Ministry of Information and Broadcasting
5. Kiran’s SSC CGL Combined Graduate Level Exams Question bank 1999-2015 by Kiran Publication
6. Master Guide SSC Combined Graduate Level Tier-I Examinationby Arihant

• A Modern Approach to Verbal & Non-Verbal Reasoning - RS AGARWAL
• How to Prepare for Logical Reasoning for CAT - ARUN SHARMA

 

Corrosion is a degradation process applicable mostly for metals. Just like we call rust for Iron. Unlike plastics, corrosion helps disposed metals to get back into the bio-cycle.

Advantages:

i. Protection : Surface corrosion forms an oxide layer which further protects the inner metal form corrosion.

ii. Corrosion prevents corrosion: Some metals like zinc are used as sacrificial anodes to prevent corrosion to other metal.

iii. Galvanic corrosion: The principle on which primary batteries work. In which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte.

Disadvantages Of Corrosion:

1. Weakens material due to prolonged corrosive action.

2. Loss, contamination, and deterioration of the appearance of a material.

3. Safety, health and environmental risks due to corrosion, especially in manufacturing plants.

4. Corrosion tends to vent in technical malfunctions in machines.

Zeroth law :- If two systems are both in thermal equilibrium with a third system then they are in thermal equilibrium with each other 1st law:- This states that energy can be neither created nor destroyed. However, energy can change forms, and energy can flow from one place to another. A particular consequence of the law of conservation of energy is that the total energy of an isolated system does not change. Second law:- indicates the irreversibility of natural processes, and, in many cases, the tendency of natural processes to lead towards spatial homogeneity of matter and energy, and especially of temperature. It can be formulated in a variety of interesting and important ways. It implies the existence of a quantity called the entropy of a thermodynamic system. In terms of this quantity it implies that When two initially isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium with itself but not necessarily with each other, are then allowed to interact, they will eventually reach a mutual thermodynamic equilibrium. The sum of the entropies of the initially isolated systems is less than or equal to the total entropy of the final combination. Equality occurs just when the two original systems have all their respective intensive variables (temperature, pressure) equal; then the final system also has the same values. third law:- The entropy of a perfect crystal of any pure substance approaches zero as the temperature approaches absolute zero.