General Science-67

     1.    The conservation of hawks and owls is important to mankind chiefly because these birds eat:

a.    numerous weed seeds 

b.    harmful birds

c.    many harmful rodents 

d.    harmful reptiles

      2.    If the plane of the earth’s equator were not inclined to the plane of the earth’s orbit:

a.    the year would be longer

b.    the winters would be longer 

c.    there would be no change of seasons

d.    the summers would be warmer

      3.    Which of the following vitamins is helpful for coagulation of blood?

a.    C

b.    D

c.    E 

d.    K

      4.    For purifying drinking water, alum is used:

a.    for coagulation of mud particles

b.    to kill bacteria

c.    to remove salts

d.    to remove gases 

      5.    A weather balloon is not fully inflated on the ground because:

a.    if the balloon is fully inflated, it may not remain stable in a storm

b.    the air inside the balloon expands as it rises and may burst

c.    it cannot withstand the outside pressure if fully inflated

d.    None of these

     6.    Vitamin B12 is most useful for combating:

a.    Anaemia

b.    Goiter

c.     night blindness

d.    Rickets

     7.    A transistor is most likely to be found in a:

a.    Fuse

b.    fluorescent lamp

c.    hearing aid

d.     wrist watch

     8.    A person born with the inner ear missing:

a.    would not have the Eustachian tube

b.    would never be able to hear sound 

c.    would be able to hear only with an electronic hearing aid 

d.    could only hear a loud explosion

     9.    The possibility of hereditary variation is greatest when:

a.    self-fertilisation occurs, as in some plants

b.    an abundant amount of food is provided for the egg

c.    organisms reproduce sexually

d.    organisms reproduce asexually

     10. Steel is more elastic then rubber because:

a.    its density is high

b.    it is a metal

c.    ratio of stress to strain is more

d.    ratio of stress to strain is less 

     11. The chief purpose if crop rotation is to check the loss of topsoil:

a.    by water erosion

b.    by wind erosion

c.    by weathering

d.    of its mineral content

     12. Which of the following acts as a resistance against disease in the body?

a.    Carbohydrates

b.    Red corpuscles

c.    Vitamins

d.    White corpuscles

      13. What is function of a dynamo?

a.    To convert heat energy into light energy

b.    To convert light energy into heat energy

c.    To convert mechanical energy into electrical energy 

d.    To convert electrical energy into mechanical energy

      14. The chief constituent of Gobar Gas is:

a.    Ethane

b.    Methane

c.    Hydrogen

d.    carbon dioxide

      15. Who is credited with the development of polio vaccine?

a.    Linus Pauling

b.    Jonas Salk

c.    Melvin Calvin

d.    Selman Waksman

       16. Which one of the following statements regarding sound is true?

a.    It travels at its greatest speed in vacuum.

b.    It produces transverse vibrations in the medium in which it travels.

c.    Its source is always a vibrating material.

d.    It cannot travel through liquids

       17.  The clear sky looks blue because of:

a.    reflection of light

b.    refraction of light

c.    diffraction of light

d.    dispersion of light

       18. Which of the following in the human body is popularly called the ‘Adam’s Apple’?

a.    Adrenal

b.    Liver

c.    Thyroid

d.    Thymus

      19. Which one of the following substances is obtained by the fractionation of human blood?

a.    Antivenom serum

b.    Gamma globulin

c.    Polio vaccine

d.    Diphtheria antitoxin

       20. Of the blood groups A, B, AB and O, which one is transfused into a person whose blood group is A?

a.     Group A only

b.     Group B only

c.    Group A and O

d.    Group AB only