Question Paper NSO Science

1. The middle vascular  coat that darkens the eye chamber and prevents refraction by absorbing the light rays is :
(a) Choroid                                                         
(b) Sclera
(c) Retina                                                        
(d) Cornea                                                         
Ans (a)
2.   The far point of a myopic eye is 1.5 m. To correct this defect of the eye, the power of lens is :
(a) 0.66 D                                                            
(b) -0.66 D
(c) +1.5 D                                               
(d) -1.5 D                                                            
Ans (b)
3.   Which of the following statements is correct about rainbow ?
(a) In primary rainbow, red colour on the outside and violet colour on the inside.
(b) In primary rainbow, violet colour on the outside and red colour on the inside.
(c) Secondary rainbow, light waves suffers one total internal reflection before coming out.
(d) Secondary rainbow is brighter than primary rainbow                      
Ans (a)
4.   In a room, artificial rain is produced at one end and a strong source of white light is switched on at the other end. To observe the rainbow an observer must :
(a) Look anywhere in the room
(b) Look towards the source
(c) Look towards the raindrops with the light source behind him.
(d) Look in a direction equally inclined to the source of raindrops.                                                            
Ans (c)
5.   A long-sighted person cannot see objects clearly at a distance less than 40 cm from his eye. The power of the lens needed to read an object at 25 cm is :
(a) -2.5 D                                                                   
(b) +2.5 D
(c) -6.25 D                                                                  
(d) +1.5 D                                                           
Ans (d)
6.   Twinkling of stars is on account of :
(a) Large distance of stars and storms in air
(b) Small size of stars
(c) Large size of stars
(d) Large distance of stars and fluctuations in the density of air                                                                 
Ans (d)
7.   The lens in the eye and corrective lenses all serve the same general purpose. What is that purpose ?
(a) To refract light                                                
(b) To open up the eye to light
(c) To reduce the amount of light that enters the eye    
(d) To reflect light                                           
Ans (a)
8.   What is true about the condition of myopia ?
(a) The image forms at a point after the retina
(b) The lens of the eye is too thin
(c) The distance of retina from lens is longer than  normal eye
(d) Both (a) and (b)                                                        
Ans (c)
9.   The lens of the eye can become thicker and thinner. Why is this flexibility useful ?
(a) The lens allows the eye to focus on far objects as well as near objects
(b) The lens can allow varying amounts of light to enter the eye
(c) The eye can move up, down, left, and right
(d) The lens is not likely to break                         
Ans (a)
10. A particle move towards a concave mirror of focal length 30 cm along its axis and with a constant speed of 4 cm/s. What is the speed of its image when the particle is at 90 cm from the mirror ?
(a) 2 cm/s                                             
(b) 8 cm/s
(c) 1 cm/s                                                          
(d) cm/s                                                              
Ans (c)
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