Physics Notes for MCAT, Physics notes for ECAT.
1.
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The
reciprocal of focal length of lens expressed in meters is called
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a)
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Focus
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b)
|
Aperture
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c)
|
Power
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d)
|
Optical
centre
|
|
2.
|
The
minimum distance between an object and its real image in a convex lens is
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a)
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2f
|
b)
|
2.5f
|
c)
|
3f
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d)
|
4f
|
|
3.
|
An
object is placed at 18 cm from a converging lens of focal length 6 cm. the
image formed is
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a)
|
Real
and inverted
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b)
|
Real
and erect
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c)
|
Virtual
and erect
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d)
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Virtual
and inverted
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4.
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The
image of an object 5 mm high is only 1 cm high.the magnification produced by
lens is
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a)
|
0.5
|
b)
|
0.2
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c)
|
1
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d)
|
2
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|
5.
|
Two
converging lenses,each of focal length f used in combination,become a
telescope if the distance between them is
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a)
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2f
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b)
|
4f
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c)
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f/2
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d)
|
f
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|
6.
|
For
incident angles equal or greater than the critical angle,the glass air
boundary will act as a
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a)
|
Convex
lens
|
b)
|
Concave
lens
|
c)
|
Mirror
|
d)
|
None
of these
|
|
7.
|
The diameter of single mode step
index fibre core is
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a)
|
10μm
|
b)
|
30
μm
|
c)
|
5
μm
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d)
|
100
μm
|
|
8.
|
The
light emitted from LED as wavelength
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|||||||
a)
|
1.2μm
|
b)
|
1.3μm
|
c)
|
1.4μm
|
d)
|
1.5μm
|
|
9.
|
The
focal length of objective lens of telescope is 60 cm.to obtain magnification
of 20 focal length of eye piece should be
|
|||||||
a)
|
5
cm
|
b)
|
4
cm
|
c)
|
3
cm
|
d)
|
2
cm
|
|
10.
|
Which
of the following is used for long distance without dispersion
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a)
|
Single
mode step index
|
b)
|
Multimode
step index
|
c)
|
Multimode
graded index
|
d)
|
Any
of these
|
|
11.
|
A
ray of light passing from rare to denser medium bends
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a)
|
Towards
normal
|
b)
|
Away
from normal
|
c)
|
Donot
bend
|
d)
|
None
of these
|
|
12.
|
The
index of refraction of diamond is 2 velocity of light in diamond is
|
|||||||
a)
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6×108
|
b)
|
3×108
|
c)
|
2×108
|
d)
|
1.5×108
|
|
13.
|
The
length of telescope is 36 cm focal length of lenses can be
|
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a)
|
30
cm,6 cm
|
b)
|
-30
cm,-6 cm
|
c)
|
30
cm,-6 cm
|
d)
|
-30
cm,6 cm
|
|
14.
|
A
compound microscope has a magnification of 30 .the focal length of the eye
piece is 5 cm.if the final image is
formed at the least distance of distint vision the magnification produced by
the objective is
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a)
|
5
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b)
|
7.5
|
c)
|
10
|
d)
|
12
|
|
15.
|
In
Michelson experiment when object’s image become visible then rotation time of one side of 8 sided mirror
is equal to time for light to cover distance
|
|||||||
a)
|
d
|
b)
|
2d
|
c)
|
d/2
|
d)
|
None
of these
|
|
|
16.
|
When
the person grew old its near point of eye
|
|||||||||
|
|
a)
|
Increases
|
b)
|
decreases
|
c)
|
No
effect
|
d)
|
None
of these
|
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|
17.
|
With
the use of graded index fibre the time difference is reduced between the
dispersed signal upto
|
|||||||||
|
|
a)
|
1 ns per km
|
b)
|
33
ns per km
|
c)
|
1
μs per km
|
d)
|
None
of these
|
||
|
18.
|
Mode
of propagation of light in multimode graded index fibre optic is
|
|||||||||
|
|
a)
|
Total
internal reflection
|
b)
|
Scattering
|
c)
|
Continous
refraction
|
d)
|
All
of these
|
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|
19.
|
The
function of collimeter is
|
|||||||||
|
|
a)
|
To
produce monochromatic light
|
b)
|
To
give parallel beam
|
c)
|
To
observe spectrum
|
d)
|
all
|
||
|
20.
|
To
increase resolving power of lens
|
|||||||||
|
|
a)
|
Increase
λ and decrease D
|
b)
|
Decrease
λ and increase D
|
c)
|
d)
|
Increase
λ and decrease D
|
|||
|
21.
|
The
far point for normal eye is
|
|||||||||
|
|
a)
|
25
cm
|
b)
|
50
cm
|
c)
|
100
m
|
d)
|
None of these
|
||
|
22.
|
If
multicolored image is formed the defect of lens is
|
|||||||||
|
|
a)
|
Spherical
aberration
|
b)
|
Chromatic
aberration
|
c)
|
Both
|
d)
|
none
|
||
|
23.
|
Less
diffraction is produced in compound microscope if we use light of colour
|
|||||||||
|
|
a)
|
Red
|
b)
|
Green
|
c)
|
blue
|
d)
|
all
|
||
|
24.
|
The
turn table of the spectrometer is calibrated in
|
|||||||||
|
|
a)
|
degrees
|
b)
|
Half
degree
|
c)
|
radians
|
d)
|
None of these
|
||
|
25.
|
Cladding
of optical fibre is made up of
|
|||||||||
|
|
a)
|
silica
|
b)
|
Plastic
|
c)
|
Conducting
metal
|
d)
|
None
of these
|
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|
26.
|
In
optical fibres system…..are used to regenerate the dim light signal
|
|||||||||
|
|
a)
|
Diodes
|
b)
|
Transistor
|
c)
|
Repeaters
|
d)
|
transformer
|
||
|
27.
|
A
convex lens behaves a diverging lens if
|
|||||||||
|
|
a)
|
Object
is placed far beyond f
|
b)
|
If
object is placed inside f
|
||||||
|
|
c)
|
A
convex lens can not diverge light
|
d)
|
none
|
||||||
|
28.
|
Using
the combination of lenses ,we can increase magnification in terms of
|
|||||||||
|
|
a)
|
Addition
of all magnifications
|
b)
|
Product
of all magnificatins
|
c)
|
Division
of all magnificatins
|
d)
|
None
of these
|
||
|
29.
|
Light always
move faster in ……medium
|
|||||||||
|
|
a)
|
Rare
|
b)
|
Denser
|
c)
|
Constant
in all
|
d)
|
none
|
||
|
30.
|
Which
of the following is not the reason of
power loss in optical fibres
|
|||||||||
|
|
a)
|
Absorption
|
b)
|
Scattering
|
c)
|
Refraction
|
d)
|
Dispersion
|
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