Objective Question Related to General Science

1. The ozone layer protects us from: 

Ans: Ultra violet rays

  F Ozone day- Sept 16

  F Ozone layer was discovered by- Charles Fabry and Henry Buisson

  F Ozone was discovered by- Christian shonbein

  F Ozone layer can absorb between 93 and 99% of the ultra violet radiation from the sun

F Dobson meter used to measure the ozone levels in the stratosphere.

F One atom of chlorine can destroy more than a hundred thousand ozone molecule

2. Atom bomb is based on the principle of: 

Ans: Nuclear fission

Ø Father of Atom bomb- Robert oppen Heimer

Ø Father of Indian Atom bomb- Dr. Raja Ramanna

Ø Father of hydrogen bomb- Edward Teller

Ø Father of Pakistan Atom bomb- Abdul Kadar Khan

3. "Mutation" theory was proposed by: 

Ans: Hugo de Vries

4. First land plants are: 

Ans: Bryophytes

The term "Bryophyte" comes from Greek work "Bryon"

5. The element which has most electro negativity: 

Ans: Fluorine

w  Fluorine is the lightest halogen, It is extremely reactive element.

w  Fluorine isolated by French chemist Henri Moisson.  

6. The tendency of a liquid drop to contract and occupy minimum area is due to: 

Ans: Surface tension

Ä The cohesive forces between liquid molecules are responsible for the phonomenon known as surface tension.

Ä Surface tension is measured in dynes/ cm.

Ä The surface tension of water is 72 dyness/cm at 25°C

7. Light from the LASER is: 

Ans: Monochromatic

ð LASER Light Amplification by Stimulated Emission of Radiation

ð Theodore - H-Maiman operated the first functioning LASER

ð LASER light consists of essentially one wave length, having its origin stimulated emission from one set of atomic energy levels

8. Study about bones are known as: 

Ans: Osteology

§  Largest bone- Femur

§  Smallest bone- Stapes

§  There are 206 bones in the body of an adult

§  There are 300 bones in the body of an infant

§  There are five types of bones in the human body. These are long bones, short bones, flat bones, irregular bones and sesamoid bones

§  Long bones- Femur

§  Short bones- Carpals

§  Flat bones- Scapula

§  Irregular bones- Vertebrae

§  Sesamoid bones- Patella

9. Raman effects is due to _____ of light

Ans: Scattering

@ The blue colour of the sky is caused by scattering of light

@ Blue light has a short wave length

@ Red light has a longer wavelength

@ Red light has double the wave length of blue light

10. Sewage treatment is carried out with the help of: 

Ans: Chlorella

·        The name chlorella is taken from the Greek word Chloros, it means green. Chlorella is a genus of single-cell green.

·        Chlorella is a single celled fresh water alga.

·        Chlorella contains B-complex vitamins, Vitamin C, Iron and Carotenoids.

·        'Cyanobacteria' - the name comes from the Greek word ‘kyanos’.

·        Cyanobacteria is also known as blue - green algae.

·        Spirogyara is a genus of Filamentous charophyte green algae.

·        Chara is a genus of green algae in the family characeae.

11. pH value of blood is: 

Ans: 7.4

Ü Solutions with a pH less than 7 are said to be Acidic.

Ü Solutions with a PH greater than 7 are said to be basic or Alkaline. 

Ü pH scale was introduced by Danish Chemist Soven Pedev Lauritz Sovensen.

Ü A pH of 7.0 is neutral

Ü pH is measured on the scale of 0 to 14 of the hydrogen ions in solution.

Ü The higher pH of any substance or solution, the more electrical resistance that substance or solution.

Ü Calcium helps maintain pH balance by neutralising the acids and toxins in the body.

12. The theory of 'jumping genes' was propounded by:

Ans: Barbara McClintock

F Transposable elements is known as 'Jumping genes'

F Transposable elements are DNA sequences that move from one location on the genome to another.

F Barbara McClintock's discovery of jumping genes earned her Nobel prize in 1983.

F Thomas Hunt Morgan, the first person to definitively link inheritance of a specific trait with a particular chromosome.

13. Nib of a pen is split keeping in view the phenomenon of: 

Ans: Capillary

Ø Capillary Action is the result of adhesion and surface tension.

Ø Capillary action occurs when the adhesion to the walls is stronger than the cohesive forces between the liquid molecules.

Ø Capillary action, also known as capillarity.

14. Vulcanisation is the process of adding _____ to rubber.

Ans: Sulphur

@ Atomic number of Sulphur - (Z = 16)

@ It forms poly atomic molecules

@ It burns with blue flame

@ It is insoluble in water.

@ It is a multivalent non-metal

@ Hydrogen sulphide is smell of rotten egg.

@ It is used in Fungicides, Fertilizer, Batteries, Detergents, Gun powder and Match bon

@ Stibnite is known as Antimony Sulphide.

@ Lead sulphide is known as galena

@ Mercury Sulphide is known as Cinnabar

@ Zinc sulphide is known as Sphalerik.