Sample Sainik School Science & Social studies booklet by Sainikrimc.com

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Sample contents of book let Social studies and Science Published by
Defence Academy Coimbatore
www.sainikrimc.com
for entrance Exam 2018 

Chapter- III Simple Machines

                A machine is a device or a tool which helps us to do WORK easily, efficiently and faster.

Simple machines do work either by changing the direction of FORCE or by reducing the effort needed.

1)      A MACHINE is a device or a tool which helps us to do work easily.

2)      LEVER is a rigid bar or rod that rests on a support called fulcrum.

3)      Levers are categorized into THREE different classes.

4)      In first class levers, the FULCRUM is placed between the effort and the load.

5)       In second class levers, the LOAD is between the fulcrum and the effort.

6)      In third class levers, the EFFORT is between the load and fulcrum.

7)      An INCLINED PLANE is a slopping or a slanting surface which connects a lower level to a higher level.

8)      A PULLEY is a simple machine made with a rope or chain wrapped around a wheel.

9)      A wheel and axle arrangement is a modified lever of the FIRST CLASS.

10)    A SCREW is an inclined plane wrapped around a rod spirally.

11)   A WEDGE is an object with at least one slanting side ending in a sharp edge.

12)   Which of these simple machines helps to move heavier objects to a height?

Ø  Lever                     b) inclined plane               c) Pulley              d) Rope               

              13. Tongs are an example of

                     a) First Class Lever  b) Second Class Lever  c) Third Class Lever 

          14. Lever is a rigid bar or rod that rest on a support called____

              a) Fulcrum           b) Load                c) Effort                 d) None of these

          15. Which of these is a modified level of the first class?

               a) Wedge           b) Fixed Pulley         c) Wheel and axle

Chapter 4: AIR and WATER

Ø  Air is present everywhere around us. We cannot see it, but we can feel it.

Ø  The planet earth is surrounded by a thick envelope of air called ATMOSPHERE

Ø  The atmosphere is divided into FIVE layers- Troposphere, Stratosphere, Mesosphere, Thermosphere and exosphere .

Ø  Nitrogen is the most abundant gas and comprised 78 percent of the earth’s atmosphere. OXYGEN comprised almost 21 % of the atmosphere. Carbon dioxide only accounts for 0.03 % of the Atmosphere.

Ø  Air also consists of minute quantities of gases like argon, ozone, hydrogen, water vapour, neaon, krypon, etc. Air is colourless, odourless and taastless. AIR occupies space and has weight.  It exerts pressure and supports combustion.

Ø  Water is also essential for life.  It is found on the earth in different sources like, RIVER, OCEANS, Under the ground.etc.

Ø  Based on their nature, impurities can be of TWO types, Soluble and insoluble impurities.

Ø  Soluble impurities can dissolve in water; insoluble impurities do not dissolve in water.

Ø  Soluble impurities are REMOVED either through evaporation or Distillation.

Questions:

Ø  AIR comprises almost 21 percent of the earth’s Atmosphere.

Ø  Air also has WEIGHT and exerts PRESSURE

Ø  The air pressure VARIES from place to place and it decreases as we go UP.

Ø  It is very import to consume 3 litres of water to stay healthy

Ø  There are FIVE layers of Atmosphere.

Ø  Nitrogen consists of 78 % of the earth’s atmosphere

Ø  Air consists of Oxygen which supports  LIFE.

Ø  Insoluble  impurities can be removed through SEDIMENTATION , Decantation and Filtration.

Ø  Which of these gases comprises 78 percent of the Atmosphere?

a)      Oxygen,   b) Nitrogen,   c) Carbon di oxide  d) Ozone

Ø  Air supports combustion because it contains____

a)      Nitrogen   b) Water Vapour   c) Oxygen       d) Carbon di oxide.

Ø  Which of these is a purification technique for the removal of insoluble impurities?

Ø  A) Distillation     b) Evaporation  c) Sedimentation and Decantation.

Ø  Which of these is the best technique for removal of insoluble impurities?

Ø  A) Distillation     b) Evaporation  c) Sedimentation and Decantation.