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MCAT Physics Mcqs Paper

MCAT Physics Mcqs Paper

1.
The reciprocal of focal length of lens expressed in meters is called

a)
Focus
b)
Aperture
c)
Power
d)
Optical centre
2.
The minimum distance between an object and its real image in a convex lens is

a)
2f
b)
2.5f
c)
3f
d)
4f
3.
An object is placed at 18 cm from a converging lens of focal length 6 cm. the image formed is

a)
Real and inverted
b)
Real and erect
c)
Virtual and erect
d)
Virtual and inverted
4.
The image of an object 5 mm high is only 1 cm high.the magnification produced by lens is

a)
0.5
b)
0.2
c)
1
d)
2
5.
Two converging lenses,each of focal length f used in combination,become a telescope if the distance between them is

a)
2f
b)
4f
c)
f/2
d)
f
6.
For incident angles equal or greater than the critical angle,the glass air boundary will act as a

a)
Convex lens
b)
Concave lens
c)
Mirror
d)
None of these
7.
The diameter of single mode step index fibre core is

a)
10μm
b)
30 μm
c)
5 μm
d)
100 μm
8.
The light emitted from LED as wavelength

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

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

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)
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

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

a)
5
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
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
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
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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