Monday, October 30, 2017

REFRACTION OF LIGHT TEST PAPER

1.      Light is a form of ------- that we can detect with our ---------

(a) Energy, ears                

(b) Corpuscles, eyes

(c) energy, eyes                

(d) Sensation, skin


2.      The unit of power of a lens is

(a) Metre                         

(b) Dyne

(c) Dioptre                         

(d) None of these


3.      The unit of refractive index is

(a) Metre                           

(b) Degree

(c) Diopre                         

(d) It has no units


4.      A simple magnifying glass consists of a

(a)    Concave lens

(b)   Convex lens of large focal length

(c)    Convex lens of small focal length

(d)   Plane mirror only


5.      The eye lens is a

(a)    Transparent double-convex lens

(b)   Transparent double-concave lens

(c)    Transparent concavo-convex lens

(d)   None of these


6.      Long-sightedness is caused by the eyeball being too short, it can be corrected by the use of a

(a) Convergent lens           

(b) Plane mirror

(c) Divergent lens              

(d) None of these 


7.      Astigmatism occurs when the cornea does not have a truly spherical shape. This defect can be cured by the use of a

(a) Concave lens                

(b) Cylindrical lens

(c) Convex lens                

(d) Plano-convex lens                    


8.      The power of a lens being + 4 dioptres suggests

(a) Convex lens                 

(b) Plano-convex lens

(c) Concave lens                

(d) None of these


9.      The amount of light entering in the eye is controlled by the

(a) Pupil                             

(b) Iris

(c) Cornea                                     

(d) Eye lens


10.  A green leaf placed in dark room is illuminated by red light. The leaf will appear to be

(a) Green                           

(b) Red           

(c) Yellow                                    

(d) Black


11.  An object looks red when seen through a piece of red glass. What is the actual colour or the object?

(a) Red only                     

(b) White only

(c) Red or green               

(d) Black


12.  A pencil dipped into water at an angle appears broken due to ---- of light.

(a) Dispersion                   

(b) Reflection

(c) Refraction                    

(d) None of these    


13.  A swimming pool looks shallower than it really is, when seen by a person standing outside near it, because of the phenomenon of --------- of light.

(a) Refraction                   

(b) Reflection

(c) Dispersion                    

(d) None of these


14.  In optical instruments, the lenses are used to form images by

(a) Reflection                   

(b) Refraction

(c) Dispersion                   

(d) Scattering


15.  A lens which is thicker in the middle and thinner at the edges is called a ------- lens.

(a) Convex                        

(b) Concave

(c) Cylindrical                  

(d) None of these


16.  A lens which is thinner at the middle and thicker at the edges is called a ------- lens.

(a) Convex                                    

(b) Concave

(c) Cylindrical                   

(d) None of these


17.  The power of a lens is a measure of its degree of

(a)    Convergence only

(b)   Divergence only

(c)    Convergence or divergence

(d)   None of these


18.  Most of the refraction of light takes place in the

(a) Iris                                

(b) Cornea

(c) Pupil                             

(d) Retina


19.  The central circular aperture of --------- is called -------------.

(a) Iris, pupil                      

(b) Pupil, iris

(c) Retina, iris                   

(d) None of these


20.  When the light is very bright,

(a)    The iris makes the pupil expand

(b)   The iris makes the pupil contract

(c)    The iris and the pupil remain as they are

(d)   None of these 


21.  Our eye is a

(a) Convex lens                 

(b) Concave lens

(c) Plano-convex lens        

(d) None of these


22.  The eye lens is held in position by

(a) Rods and cones           

(b) Iris and pupil

(c) Ciliary muscles                        

(d) None of these


23.  The 'far point' of a normal human eye is

(a) 25 cm                          

(b) 25 m

(c) 100 m                          

(d) At infinity


24.  Hypermetropia is due to the ------- of the eye.

(a)    Low converging power

(b)   Low diverging power

(c)    High converging power

(d)   High diverging power 


25.  Long-sightedness is to hypermetropia as short-sightedness is to

(a) Myopia                       

(b) Focussing

(c) Astigmatism                 

(d) Accommodation


26.  The human eye forms the image of an object at its

(a) Cornea                                     

(b) Iris

(c) Pupil                            

(d) Retina


27.  The change in focal length of an eye-lens to focus the image of object at varying distances is done by the action of the

(a) Pupil                           

(b) Ciliary muscles

(c) Retina                          

(d) Blind spot


28.  A magnifying glass comprises a simple

(a) Convex lens                

(b) Convex mirror

(c) Concave lens                

(d) Concave mirror


29.  Which of the following optical instruments consists of two converging lenses?

(a)    Compond microscope            

(b)   Simple microscope

(c)    Electron microscope    

(d) Galileon telescope 


30.  Sunlight is predominantly a mixture of -------- visible colours.

(a) 5                                   

(b) 6

(c) 7                                   

(d) None of these


31.  Colour blindness is due to

(a)    The absence of cone cells

(b)   The presence of rod cells

(c)    The absence of rod cells

(d)   None of these


32.  The rod cells correspond to

(a)    The colour of light     

(b)   The source of light

(c)    The intensity of light   

(d) None of these 


33.  Which of the following colours of light undergoes the least deviation while passing through a glass prism?

(a) Red                             

(b) Blue

(c) Yellow                                   

(d) Green


34.  Which of the following sources of light is different from others?

(a) Sunlight                       

(b) White light

(c) Light from a bulb         

(d) Sodium light


35.  The combination of red light and blue light is

(a)    Yellow light                

(b) Green light

(b)   Light of magenta colour

(c)    Light of white colour


36.  Which colour of light is produced on mixing green with magenta?

(a) White                           

(b) Red

(c) Yellow                                    

(d) None of these


37.  The colour complementary to yellow is

(a) Blue                             

(b) White

(c) Red                              

(d) Green


38.  A red grass in white light appears

(a) Red                              

(b) Green

(c) Yellow                                     

(d) None of these


39.  Which of the following colours cannot be produced by mixing other colours?

(a)    Red, blue, green          

(b) Red, Yellow, green

(b)   Blue, green, cyan

(c)    Magenta, yellow, cyan


40.  The cyan colour is commonly known as

(a) Peacock colour            

(b) Blood red

(c) Sky blue                       

(d) None of these


41.  How should people wearing spectacles work with a microscope?

(a)    They should keep on wearing their spectacles.

(b)   They should never use the microscope.

(c)    They should take off their spectacles.

(d)   They may either either put on their spectacles or they may take off their spectacles.    

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