Model Questions for Scientific Assistant (IMD) Exam (Paper-1) General Science-Set 49

Write and Discuss Your Answer with Q.No in Comment Box at the Bottom of Post.

1. Velocity of sound will be

(a) smaller in moist air than in dry air
(b) greater in moist air than in dry air
(c) same in moist and dry air
(d) independent of in density

2. To a stationary man the frequency of a sound source moving towards the man appears to be

(a) lower than the original frequency
(b) same as the original frequency
(c) higher than the original frequency
(d) lower as well higher than the original frequency depending upon the speed of the source

3. The electromagnetic radiations are in descending order of wavelength in the following sequence :

(a) infrared waves, radio waves, x-rays, visible light rays
(b) radio-waves, infrared, visible light, x-rays
(c) radio waves, visible light, infrared waves, x-rays
(d) x-rays, visible light, infrared wave, radio waves

4. The inosphere does not allow to pass the waves which are termed as :

(a) microwaves
(b) visible light waves
(c) (a)and (b) both
(d) amplitude modulated waves

5. The ionosphere bends the electro-magnetic waves having the frequencies :

(a) less than 40 MHZ
(b) beyond 40 MHZ
(c) nothing is certain
(d) depends on the moisture present

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6. Choose the incorrect statement related to the laws of reflection :

(a) the reflected ray and the incident ray lie in the same plane
(b) the incident ray, reflected ray and the normal are concurrent
(c) the angle of incidence is equal to the angle of reflection
(d) none of these

7. Choose the correct statement related to the image formed by a plane mirror

(a) a plane mirror always forms a virtual image
(b) the image formed by a plane mirror may be magnified or diminished
(c) the image formed by a plane mirror is always
unmagnified and inverted
(d) the image formed by a plane mirror is always unmagnified and erect

8. The macromolecules consisting of a very large number of simple structural units joined together in a regular manner are called

(a) monners
(b) epimers
(c) polymers
(d) all the above

9. Which one of the following is a naturally occurring polymer ?

(a) Starch
(b) PVC
(c) Neoprene
(d) Nylon

10. Hexachloroethane is used

(a) as a substitute for camphor
(b) in preparation of explosives
(c) in manufacture of silk
(d) all the above

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Answer

1. (b) 2. (c) 3. (b) 4. (d) 5. (a) 6. (d) 7. (d) 8. (c) 9. (d) 10. (a)