gk lokam: Science
Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts

3 February 2020

Nutrition and Health MCQ|Nutrition and Health Questions and answers

Nutrition and  Health MCQ|Nutrition and  Health  Questions and answers

Nutrition and  Health 

1.  A  substance  needed by the  body for growth, energy, repair and maintenance  is  called a _______________. 

A:  nutrient  B:  carbohydrate C:  calorie D:  fatty  acid 

Ans:  A 

6 November 2019

50 Expected Questions on Chemistry| Chemistry Questions and Answers

50 Expected Questions on Chemistry| Chemistry Questions and Answers

1. The substance that can be used as a hypnotic: Barbituric acid

2. The ‘fixing agent’ used in photograhic film is: Sodium thiosulphate

3. The maximum concentration of ozone is found in the: Stratosphere

4. The Halogen which is used as an antiseptic: Iodine

5. The lightest noble gas: Helium 

6. Cetane number is used to rate: Diesel

7. Plaster of Paris is prepared by heating: Gypsum

8. The heaviest of Alkaline earth metals: Radium

9. Which metal foil is used for packing chocolates, medicines, cigarettes etc?

10. As per Avogadro’s hypothesis, equal volume of different gases at the same temperature and pressure contain equal number of: molecules

11. The element with the largest number of isotopes: Tin

12. Which property of copper and aluminium makes them suitable for making cooking utensils and boilers? 
High thermal conductivity

13. Silver objects turn dark on prolonged exposure to air due to the formation of: Silver sulphide

14. In which type of rocks petroleum is found?

15. The green coating on the surface of copper objects kept exposed to moist air is due to the formation of: Basic copper carbonate 

16. What is the full form of P.V.C.? Poly Venyl Chloride

17. Hydrogen in liquid form is used as: rocket fuel

18. In which form cooking gas is supplied cylinders for domestic consumption?

19. The process used in dairies to separate cream from milk is: Centrifugation

20. Radio Carbon dating was discovered by: Willard Franck Libby

21. Development of unpleasant smell and taste in oil and fat containing food items due to oxidation of atmospheric oxygen is called: Rancidity

22. An anti-oxidant often added to fat containing foods to prevent rancidity: Butyrated hydroxi anisole

23. The most abundant type of coal: Bituminous

24. Pigments obtained from plants can be separated by: Chromatography

25. Which is called the ‘Mother of Pearl’?

26. Teflon, the tough and fire resistant polymer, containing the halogen: Flourine

27. The glass used to make optical instruments: Flint glass

28. Molish test is used to detect the presence of: Carbohydrates

29. The acid used to make permanent writing on the surface of glass: Hydrofluric acid

30. What is the full form of LPG? Liquified Petroleum Gas

31. Cyclonite is also known as: RDX

32. A non metal other than carbon which shows allotropy is: Sulphur

33. The radio active isotope used to determine the activity of thyroid gland is: Iodine-131

34. Camphor can be separated from sand by: Sublimation

35. Which halogen is contained in DDT?

36. Smoke, fog and mist are examples of: Aerosols

37. Iron that contains the highest percentage of carbon: Pig Iron

38. Acidity in milk is caused by: The activity of enzymes

39. Which element has the lowest melting point? Helium

40. The element with the highest density-Osmium

41. The lightest metal: Lithium

42. The element with the highest boiling point: Tungsten

43. Which element has the second highest density? 

44. The most abundant metal in human body:Calcium

45. What percent of the atmosphere is Oxygen?

46. What percent of the mass of human body is Oxygen?

47. The most common element on the earth’s crust by mass: Oxygen

48. The most abundant element in the moon: Oxygen

49. Which metal has the highest melting point? 

50. The most abundant metal in the whole earth: Iron

50 Questions on Biology|Expected Biology Question and Answers for Competitive Exams

50 Questions on Biology|Expected Biology Question and Answers for Competitive Exams

1. Vermiculture is related to: Earth Worm

2. Silver Revolution is related to the enhanced production of: Poultry

3. White Revolution is related to the enhanced production of: Milk

4. Antibiotic Penicellin is produced by: Fungi

5. Birds includes in the class: Aves

5 November 2019

Planets Earth and Mars

Planets Earth and Mars


Distance from the sun : 150 million km
Period of Revolution : 365 days hrs 48 min 45 sec
Period of Rotation : 23 hrs 56 min 4 sec
Escape Velocity : 11.2 km/sec
Diameter : 12,756 km
Polar diameter : 12713 km
Age : 4.6 billion years old

Star, Origin of Stars,Types of Star

Star, Origin of Stars,Types of Star


The stars which lies immediately above the earth's North pole and around which all other stars seems to revolve is called 
Ans : Pole Star

Evolution of Universe

Evolution of Universe

Origin of Universe

There are three main theories put forward to explain origin and evolution of universe.


Most widely accepted theory regarding the origin of universe
Ans : Big Bang Theory

Big Bang Theory was proposed by
Ans : George Lemaitre

Big Bang Theory was modified by
Ans : Edwin Hubble

The term big bang was coined by
Ans : Fred Hoyle

Big bang theory is also called as
Ans : Expanding Universe Hypothesis


Steady State Theory was proposed by
Ans : Hermann Bondi, Thomas Gold and Fred Hoyle

Steady State Theory was proposed in
Ans : 1948

Quasi Steady State Theory was proposed by
Ans : Jayant Narlikar


The Pulsating Theory was proposed by
Ans : Dr. Allan Sandage

The theory which proposed that at present universe is expanding
Ans : Pulsating Theory


A galaxy is a vast collection of billions of stars, dust, gas and empty space held together by
Ans : Gravitational force

The word galaxy was first introduced by
Ans : William Herschel

First person to calculate distance between galaxies
Ans : Sir Edwin Hubble

There are about 5Q billion galaxies exist in the universe
Group of galaxies is known as
Ans : Cluster

The most distant object visible to naked eye in the universe
Ans : Andromeda Galaxy

Our sun and its planets belongs to the
Ans : Milky Way Galaxy or Akash Ganga

First astronomer to demonstrate the existence of galaxies beyond milky way
Ans : Edwin Hubble (1924)


1.Spiral Galaxies
2.Elliptical Galaxies
3.Irregular Galaxies

The galaxy having central nucleus with great spiral arms
Ans : Spiral Galaxy

Milky way and Andromeda are the examples of
Ans : Spiral Galaxies 

New stars are formed in Spiral Galaxies Largest spiral galaxy
Ans : Andromeda Galaxy

The farthest object which can be seen with naked eyes
Ans : Andromeda Galaxy

The milky way belongs to a cluster of galaxies called
Ans : Local group

The galaxies having no spiral arms are called
Ans : Elliptical,Galaxies

Red Giants and white dwarfs are seen in the
Ans : Elliptical Galaxies 

Dim collection of old stars are seen in the
Ans : Elliptical Galaxies 

Galaxies having no regular shape
Ans : Irregular Galaxies 

Large Magellanic cloud is an
Ans : Irregular Galaxy

20 October 2019

Human Body Basics |Components of Human Body

Human Body Basics -Components of Human Body

Elements of Human Body

Clinical Composition of Human Body

More than 93 per cent of the human body consists of three chemical elements-oxygen (65%), carbon (18.5%), and hydrogen (10%). 
Nitrogen (3%), calcium (1.5%), and phosphorus(1%) are also present in significant amounts.
At least 54 chemical elements feature in total, but most of these are tiny traces.

Tissues and Types of Tissues in Human Body

Tissues and Types of Tissues in Human Body


Tissues are groups of connected cells. 
Many tissues are made entirely from one type of cell. 
The four main types of tissue in the human body are;
  1. Connective tissue
  2. Epithelial tissue
  3. Muscular tissue
  4. Nervous tissue

What Makes a Body?Making a Human

What Makes a Body?Making a Human

What Makes a Body?

The human body is made from the same components as every other living thing. It is the way that they are put together that makes our bodies uniquely human. 

The basic materials are simple chemicals such as water, carbon, and oxygen, but they join to create more complex compounds. Trillions of microscopic cells become the building blocks of life, grouping together to form skin, bones, blood, and organs, until the body becomes complete.


Making a Human

Everything in the body  is made up of atoms, the tiniest building blocks of matter. 
  Atoms combine to  form molecules. 
 Millions  of molecules form every cell in the body. 
 There are  more than 200 types of cell,
with similar cells working in teams called tissues.
 The body's many organs and  systems are made up of-
 different tissues.

 Atoms =>Molecules =>Cell=>Tissue=>Organ=>Body System

Atoms and molecules

The smallest parts in the body are atoms.
These tiny building blocks form the elements in the body, such as carbon. 
Atoms can also  join together in groups called molecules
for  example, water is a molecule, made from a  combination of hydrogen and oxygen atoms.



Molecules build up to create body cells.
There are about 37 trillion cells in the average human, with different types of cells carrying out a variety of body functions, from transporting oxygen to sensing light and colour in the eye.


Cells performing the same  function are grouped together to form body tissues, such as skin, fat, or heart muscle. 

Blood is also a tissue, in liquid form.


Different kinds of tissue combine to make larger structures called organs.
Each organ works like a machine,performing its own role. 
An example of an organ is the stomach, which plays a part in the process of digesting food.

Body system

Organs are at the centre of 12 internal body systems. 
Each system has a specific job to keep the body in working order.

The stomach is one of the main organs of the digestive system.

Complete human

When this complex combination of integrated systems, organs, and tissues work together, the human body is complete. 

Each individual component plays its part in maintaining a fully functioning body.

1 October 2019

Solar System: Sun and the Eight Planets

Solar System: Sun and the Eight Planets

Solar System

The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids  form the solar system.

 We often call it a solar family, with the sun as its Head.