General Science preparation question answer pdf download

Online preparation with selected very important General Science questions and answers set. Users can download in pdf format. It’ll useful for all type government competitive exams. 

1. A transistor is most likely to be found in a–
   (A) fuse (B) fluorescent lamp
   (C) hearing aid (D) wrist watch
   Ans : (C)
2. An eye defect which usually results from an unequal curvature of the cornea is–
   (A) nearsightedness (B) astigmatism
   (C) colour blindness (D) night blindness
   Ans : (B)
3. The velocity of sound in air (under normal conditions) is–
   (A) 30 m / sec (B) 320 m / sec
   (C) 332 m / sec (D) 3,320 m / sec
   Ans : (C)
4. A photo-electric cell converts–
   (A) sound energy into electrical energy (B) light energy into electrical energy
   (C) an electrical signal into sound waves (D) electrical energy into light energy
   Ans : (B)
5. When a given amount of air is cooled–
   (A) the amount of moisture it can hold decreases (B) its absolute humidity decreases
   (C) its relative humidity remains constant  (D) its absolute humidity increases
   Ans : (A)
6. The greatest value of bees to mankind is in–
   (A) supplying of food for birds
   (B) insuring pollination of certain crop plants
   (C) storing honey for man’s use
   (D) furnishing beeswax needed in certain specialised industries
   Ans : (B)
7. The moon has no atmosphere because–
   (A) no atmosphere has ever formed there
   (B) the rocky surface completely absorbed the gases 
   (C) due to the low temperature, gases have condensed
   (D) its gravitational pull is not strong enough to hold an atmosphere 
    Ans : (D)
8. With the present-day advancement in medical techniques, transplants are possible in all of the following except–
   (A) artery (B) bone
   (C) cornea (D) kidney
   Ans : (B)
9. The reaction which converts sugar solution into alcohol is a example of–
   (A) saponification (B) hydrogenation
   (C) fermentation (D) hydrolysis
   Ans : (C)
10. The Rh factor refers to–
    (A) a protein substance found in the blood of some people
    (B) a hormone carried by the blood
    (C) the ratio of red corpuscles to white corpuscles in the blood
    (D) a process that speeds up the clotting of blood
    Ans : (A)
11. When a moving bus stops suddenly, the passengers are pushed forward because of the–
    (A) friction between the earth and the bus
    (B) friction between the passengers and the earth
    (C) inertia of the passengers
    (D) inertia of the bus
    Ans : (C)
12. Which of the following is not an attribute of bacterium ?
    (A) Ability to arise from non-living matter (B) Growth
    (C) Reproduction (D) Respiration
    Ans : (A)
13. Which of the following vitamins is helpful for coagulation of blood  ?
    (A) C (B) D (C) E (D) K
    Ans : (D)
14. 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
    Ans : (A)
15. 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
    Ans : (B)
16. Vitamin B12 is most useful for combating–
    (A) anaemia (B) goitre
    (C) night blindness (D) rickets
    Ans : (A)
17. Which of the following sounds cannot be heard by human ear?
    (A) 300 vibrations / sec (B) 1,000 vibrations / sec
    (C) 10,000 vibrations / sec (D) 30,000 vibrations / sec
    Ans : (D)
18. Exposure to sunlight helps a person improve his health because–
    (A) the infra-red light kills bacteria in the body    
    (B) resistance power increases
    (C) the pigment cells in the skin get stimulated and produce a healthy tan
    (D) the ultraviolet rays convert skin oil into Vitamin D
    Ans : (D)
19. Small amounts of iodine are necessary in our diet to–
    (A) prevent pellagra
    (B) compensate for underactivity of the thyroid gland
    (C) stimulate clotting of blood
    (D) stimulate pituitary gland
    Ans : (B)
20. The method of estimating the age of the crust of the earth, which is now believed to be the most accurate, makes use of the rate of–
    (A) accumulation of sedimentary beds  (B) accumulation of salt in the ocean
    (C) atomic disintegration (radio-activity) (D) loss of heat by the earth
    Ans : (C)