## Mental Ability – Competitive Exam Preparation – Number Series by adding fixed number – NTSE, NCO, NSO, IMO and other Competitive Exams

The sequence or series of numbers created by adding fixed number :

1. 5 , 7 , 9 , 11 , 13 etc – Number sequence obtained by adding fixed number 2
2. 6, 11, 16, 21, 26 etc – Number sequence obtained by adding fixed number 5

Similarly number sequence can be obtained by adding two fixed numbers alternatively or by adding two fixed numbers after repeated series. Example below:

5, 7, 10,12, 15, 17, 20 etc – This number sequence is formed by adding 2 and 3 alternatively

5, 6, 7, 9, 11, 13, 16, 19, 22 etc – This number sequence is formed by adding fixed number 1 , 2 and 3 after regular interval i.e after 3 numbers

We will revert back with right answers at the earliest

Complete the sequence by adding fixed numbers

1. 1234, 1236, 1238, _____, 1242, 1244, _____
2. 1400, 1500, ______ , 1700, 1800, 1900, ______
3. 3, 9, 15, _____, 27, 33, 39, ______, 51
4. 8, 17, _____, 35, 44, _____, 62
5. 10, 15, 25, 35, 40, 45, 55, 65, _____ , 75, 85, ______
6. 6, 9, 15, 21, 24, 27, 33, ______ , 42, ______
7. 3, 5, 7, 10, 13, 16, 18, 20, _____, 25, ______, 31
8. 10, 20, 50, _____, 90, 100, 130, 160, _____, 180, 210, 240
9. 1000, 1200, 1600,________, 2200, 2400, 2800, 3200
10. 86, 96, 116, 136, 166, ______, 236, 276, 326, 376

## Human Body Blood Notes for Competitive Exams

### Blood is fluid connective tissue

• pH of blood is 7.4
• pH is a scale used to specify the acidity or basicity of an solution
• pH of 7 is neutral
• pH below 7 is acidic
• pH above 7 is basic

Hence blood is basic

Quantity of blood is around 7-10% of body weight. Human body contains 5-6 litres of blood

• Blood consists of two parts
• Plasma
• Plasma is 55%
• Plasma contains 90% – Water, 10% – Protein, Salts and Glucose
• Plasma is liquid part of blood.
• Plasma transports oxygen, carbon di oxide, digested food and excretory material
• Blood Cells / Corpuscles
• Blood Cells / Corpuscles is 45%
• Blood cells is divided into – RBC , WBC and Platelets
• RBC – Red Blood Cells / Corpuscles
• Biological Name of RBC is Erthrocytes
• RBC has no nucleus and carry oxygen
• RBC is present in large quantity
• For every 600 RBC, there is 1 WBC i.e. RBC Count :WBC Count is 600:1 ratio
• RBC is formed in bone marrow
• RBC dies in spleen and liver.
• Graveyard of RBC is liver
• Lifespan of RBC is 90 – 120 days
• Haemoglobin is part of RBC
• Haemoglobin contains Haemo ( Iron – Fe 2+ ) and globin ( protein ). Blood is red in colour due to Iron in Haemoglobin. Globin helps combine oxygen and carbon di oxide and carry oxygen.
• Diseases associated with haemoglobin is anemia and jaundice
• WBC – White Blood Cells / Corpuscles
• Biological Name of RBC is Levcocytes
• WBC is formed in bone marrow
• WBC dies in blood
• Lifespan of WBC is 3 – 5 days
• Quantity of WBC is less than RBC. RBC Count :WBC Count is 600:1 ratio
• WBC forms antibodies. Antibodies protect us from diseases and infections.
• AIDs/HIV causes deficiency of WBC
• Platelets
• Biological Name of Platelets is Thrombocyte
• Platelets are present in human body and mammals
• Platelets is formed in bone marrow
• Platelets dies in blood
• Lifespan of Platelets 3 – 5 days
• When bleeding happens , clot is formed
• Platelets help in blood clotting
• Due to Dengue , platelets count is reduced

# National Level Science Talent Search Examination- NSTSE – CLASS 2 QUESTION 2021 – PART 3

Look at the picture and answer question no. 21 – 23.

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