Paper for Entry Test Preparation
Physics 1st year Chapter No. 10
Total marks:- 160 Time
allowed 30 minutes
1) With age, least distance of distinct vision:
a)
Increases b)
Decreases c) Is
not affected d) Non
of all
2) When the object lies b/w F and 2F, the image
formed by a convex lens is:
a)
Real b)
Virtual c)
Diminished d)
Erect
3) A convex lens acts as diverging lens when the
object is placed:
a)
B/w F and 2F b) At
2F c)
With focal length d) Beyond 2F
4) The ratio of the diameters of two convex lens is
__ the ratio of their focal lengths:
a)
Greater than b)
Less than c)
Equal to d) Non of all
5) Conventionally, all the distances p, q, f are
measured from __ of the lens:
a)
Focus b)
Optical centre c)
Edges d)
Non of all
6) A ray passing through optical centre of a lens,
after refraction:
a)
Passes through focus b) Go
undeviated c) Retraces
its path d) Both (b) and
(c)
7) Convex lens forms:
a)
Always real and inverted image b)
Real and inverted if p > f
c)
Virtual and erect if p > f d)
Both (b) and (c)
8) If the object is placed at 12 cm distance from a
convex lens of focal length 6 cm, then we get an image of:
a)
Double the size b) Same
size c) Half
the size d) Non of
all
9) We know that M = β / α for a lens, where α is:
a)
Angle subtended by the image as seen through the lens b) Angle subtended by the object through unaided eye
c) Any of above d)
Non of all
10) The size of the image is maximum when its
distance from the magnifying glass is:
a)
0.10 m b)
0.15 m c)
0.20 m d)
0.25 m
11) A magnifier gives an image which is:
a)
Virtual, inverted b)
Real, erect c)
Virtual, erect d)
Real, inverted
12) The focal length of convex lens having
magnifying power of 5.55 is:
a)
5.5 cm b)
5.0 cm c)
4.5 cm d)
6.0 cm
13) Raleigh formula for resolving power is given by:
a)
R = λ / Dλ b) R = N x m c) αmin =
1.22 (λ / D) d) Non of all
14) Resolving power in mth order diffraction for
grating is given by:
a)
R = N / m b) R
= m / N c) R =
N x m d) Non of
all
15) Maximum details of an object can be seen by a
microscope when the object is illuminated by light of:
a)
Longer λ b)
Shorter λ c)
Infrared light d)
Non of all
16) A lens of 2 cm focal length is to be used as a
magnifying glass, its magnification is:
a)
13.5 b)
12.5 c)
0.5 d)
2.5
17) To mend the watches, the watch-makers make use
of:
a)
Double convex lens b) Double
concave lens c) Plano-convex lens d)
Non of all
18) In the compound microscope, magnifying is
produced:
a)
Only by objective b) Only by eye-piece c)
By both objective and eye piece d) Non
of all
19) When high magnification is required, we should
prefer:
a)
Astronomical telescope b) Simple
microscope c) Compound microscope d) Non of all
20) The limit to which a microscope can be used to
resolve details of an object, depends upon:
a)
Wider objective and light of short wavelength b)
Narrow objective and light of shorter wavelength
c)
Narrow objective and light of longer wavelength d) Non of all
21) The final image formed by a
compound microscope is:
a)
Virtual and inverted b) Real
and erect c) Real and
inverted d)
Virtual and erect
22) The magnifying power of a
simple microscope can be increased if we use convex lens of:
a)
Large focal length b) Small
focal length c) Same focal
length d) Non of all
23) The focal length of objective
lens of microscope is __ that of eye-piece:
a)
Greater than b)
Less than c)
Equal to d) Non of all
24) Spectrometer may be used to
find:
a)
Wavelength if light b) Angle of prism
c)
Refractive index of a transparent medium d) None of all
25) Collimator consists of a
fixed metallic tube with a __ at one end and an adjustable slit at the other
end:
a)
Convex mirror b)
Concave lens c)
Concave mirror d)
Convex lens
26) The axes of rotation of __
and __ in the spectrometer are along the same line:
a)
Collimator, telescope b)
Telescope, turntable c)
Turntable, collimator d) Non of
all
27) The magnifying power of an
astronomical telescope increases with:
a)
Decreasing fo b)
Increasing fo c)
Increasing fe d)
Non of all
28) The image of a distant object
as seen through the astronomical telescope is:
a)
Erect b)
Inverted c)
Either (a) or (b) d)
None of all
29) The focal length of eye piece
of a telescope is relatively:
a)
Smaller b)
Larger c)
Infinity d) Zero
30) In Michelson’s method, rotational
mirror has been used. The numbers of its faces are:
a)
4 b)
6 c)
8 d)
10
31) Apparatus of Michelson’s
experiment contains:
a)
Microscope b)
Prism c)
Telescope d)
Grating
32) The sides of eight-sided
mirror are:
a)
Transparent b)
Opaque c) Polished d) Unpolished
33) A ray of light passing from a
rare to denser medium:
a)
Bends towards normal b) Bends away
from normal c) Suffers no change in
direction d) Non is correct
34) For the angle of incidence __
critical angle, total internal reflection takes place:
a)
Smaller than b)
Greater than c)
Very much smaller than d) Non of all
35) A material having high
refractive index has:
a)
Low density b)
High density c)
Zero density d) Non
of all
36) Optical fibres are usually
made of:
a)
Wood b)
Silica c)
Copper d)
Glass
37) Propagation of light in an
optical fibre requires that light should be:
a)
Refracted from air to fibre b)
Continuously polarized c) Totally
reflected within the fibre d) Both (b)
and (c)
38) The optical fibre of smallest
diameter (size) is called ___ index fibre:
a)
Single mode step b)
Multi-mode graded c) Multi-mode step d) Non of all
39) Cladding means a layer of __
refractive index over the central core of ___ refractive index:
a)
Lower, lower b)
Higher, lower c)
Lower, higher d) Non
of all
40) Snell’s law:
a)
Points out that angle of incidence is equal to angle of refraction
b)
Tells us that light chooses the path of minimum time
c)
Decide about the index of refraction of a medium
d)
Non of all
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