10th Science Chapter-02 Optics Creative Question and Answers Part-04
10th Science Chapter-02 Optics Creative Question and Answers Part-04
01.In compound microscope ____ lenses are used
a) 2
b) 3
c) 4
d) 1
Correct answer
2
02.The power of the lens is the degree of convergence or divergence
a) True
b) False
Correct answer
True
03.Hypermetropia is corrected by using convex lens
a) True
b) False
Correct answer
True
04.To view heavy objects like starts _____ is used
a) Simple microscope
b) Compound microscope
c) Terrestrial telescope
d) Astronomical telescope
Correct answer
Compound microscope
05.Magnification of a convex is
a) Positive
b) negative
c) either positive or negative
d) zero
Correct answer
either positive or negative
06.Convex lenses are used in
a) camera
b) magnifying lens
c) microscope
d) all the above
Correct answer
all the above
07.The line joining the center of curvature and the optic center is pole
a) True
b) False
Correct answer
False
08.The distance below the principal focus and pole is focal length of the lens
a) True
b) False
Correct answer
True
09.Amount of scattering of light is directly proportional to fourth power of its wavelength
a) True
b) False
Correct answer
False
10.When a ray of light enters glass from water it bends
a) towards the normal due to decrease in the speed of light
b) towards the normal due to increase in the speed of light
c) away from the normal due to increase in the speed of light
d) away from the normal due to decrease in the speed of light
Correct answer
towards the normal due to decrease in the speed of light
11.Material medium is needed for the propagation of light
a) True
b) False
Correct answer
False
12.Rainbow formation is due to ____ water droplets
a) Ionisation
b) absorption of sunlight
c) reflection and refrection of sunlight
d) reflection of sunlight
Correct answer
reflection and refrection of sunlight
13.____ determines speed of light in a medium
a) thickness
b) wavelength
c) refractive index
d) both b and c
Correct answer
both b and c
14.If one of the faces of a bi-convex lens is plane.it is known as a plano- convex lens
a) True
b) False
Correct answer
True
15.To view the objects on the surface of the earth
a) Simple microscope
b) compound microscope
c) Terrestrial telescope
d) Astronomical telescope
Correct answer
Terrestrial telescope
16.The distance below the lens and focus is called
a) pole
b) radius of curvature
c) focal length
d) principal axis
Correct answer
focal length
17.The speed of light in a medium is low because of low refractive index of the medium
a) True
b) False
Correct answer
False
18.When light travels from rarer to denser medium the refracted ray is _____ the normal
a) bent away
b) along
c) bent towards
d) just grazes the surface of separation
Correct answer
bent towards
19.The image produced by a concave lens is
a) always virtual & enlarged
b) always virtual & diminished
c) always real
d) some times real, sometimes virtual
Correct answer
always virtual & diminished
20.In Astigmatism eye cannot see
a) nearby object
b) parallel lines
c) both a & b
d) Distance object
Correct answer
parallel lines
