10th Science Chapter-02 Optics Creative Question and Answers Part -01
10th Science Chapter-02 Optics Creative Question and Answers Part -01
01.Simple microscope are used
a) To observe parts of flower
b) Watch repair
c) Observe finger prints
d) All the above
Correct answer
All the above
02.In spherical lenses all distance are measured from
a) optic centre
b) principal focus
c) principal axis
d) centre of curvature
Correct answer
optic centre
03.The part of the eye refracts light entering the eye from external object
a) Lens
b) Cornea
c) Iris
d) pupil
Correct answer
Cornea
04.Red light is used in traffic signals because
a) It has highest wavelength
b) disperses least
c) red is symbol of danger
d) both a & b
Correct answer
both a & b
05.Highly enlarged image is obtained by convex lens when object is at
a) infinity
b) F
c) below F & C
d) beyond 2 F
Correct answer
infinity
06.Conave lences are used camera lences
a) True
b) False
Correct answer
True
07.Incident ray and refracted ray lie in different plane
a) True
b) False
Correct answer
False
08.When a person uses a convex lens as a simple magnifying glass the object must be placed at a
distance
a) less than one focal length
b) more than one focal length
c) less than twice focal length
d) more than twice the focal length
Correct answer
less than one focal length
09. The resolving power depends on
a) Diameter of the lens
b) Wavelength
c) Refractive index
d) a&b
Correct answer
a&b
a) A convex lens of focal length 5 cm
b) A concave lens of focal length 5 cm
c) A convex lens of focal length 10cm
d) A concave lens of focal length 10 cm
Correct answer
A convex lens of focal length 5 cm
11.The point at which the principal meets the surface of the lens is
a) centre of curvature
b) radius of curvature
c) focus
d) pole
Correct answer
pole
12.Luminous objects which give out their own light
a) True
b) False
Correct answer
True
13.The image formation by spherical lenses is due to the phenomenon of
a) reflection
b) refrection
c) interference
d) dispersion
Correct answer
refrection
14.Image formed in simple microscope is
a) Erect
b) Inverted
c) Smaller than object
d) Bright
Correct answer
Erect
15.The amount of satteing indepnted of wavelength in Rayleigh scattering
a) True
b) False
Correct answer
False
16.The part of the lens through which the ray of light passes without suffering deviation is called
a) focus
b) centre of curvature
c) optic centre
d) pole
Correct answer
optic centre
17.Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens
a) f
b) 2f
c) infinity
d) between f and 2f
Correct answer
2f
18.The scattering of light by pure light is _____ scattering
a) Rayleigh's
b) Mie
c) Raman
d) Tyndall
Correct answer
Raman
19.In a simple microscope to obtain higher magnification ,the focal length convex lens should be
a) Large
b) Small
c) 1 cm
d) None
Correct answer
Small
20.The unit of power of the lens is m
a) True
b) False
Correct answer
False
