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question_answer1)
The number of images of an object placed between two plane mirrors at \[{{45}^{o}}\] to each other is
A)
2 done
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B)
7 done
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C)
8 done
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D)
10 done
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question_answer2)
An object is placed 40 cm in front of a convex mirror of radius of curvature, 20 cm. The image
A)
Is real and 8 cm behind the mirror done
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B)
Is real and 8 cm in front of the mirror done
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C)
Is virtual and 8 cm in front of the mirror done
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D)
Is virtual and 8 cm behind the mirror done
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question_answer3)
A long vertical pin placed at 40 cm, in front of a concave mirror gives an image at the same position. The focal length of the mirror in meters is
A)
0.2 m done
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B)
0.4 m done
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C)
0.6 m done
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D)
0.8 m done
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question_answer4)
An object 5 cm high is placed at a distance of 15cm from a concave mirror of radius of curvature 20 cm. The height of the image in cm is
A)
5 cm done
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B)
20 cm done
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C)
15 cm done
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D)
10 cm done
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question_answer5)
If the object is placed 10 cm in front of a convex mirror of radius of curvature 20 cm, the magnification is
A)
2 done
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B)
1 done
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C)
1/2 done
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D)
0 done
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question_answer6)
If a person wants to see his fall size image, the minimum height of a plane mirror should be
A)
Two times his height done
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B)
Equal to his height done
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C)
Half his height done
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D)
One fourth his height done
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question_answer7)
If the radius of curvature of a concave mirror is R, its focal length is
A)
2 R done
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B)
R done
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C)
R/2 done
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D)
2/R done
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question_answer8)
A straight stick partially immersed under water obliquely appears to be bent due to
A)
Reflection done
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B)
Refraction done
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C)
Total internal reflection done
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D)
Parallax error done
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question_answer9)
The angle of incidence is the angle made by the incident ray with
A)
The surface done
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B)
Normal to the surface done
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C)
The reflected ray done
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D)
The refracted ray done
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question_answer10)
The refractive index of glass is 1.5 and speed of light in air is\[3\times 1010\text{ }cm/s\], the speed of light in glass is
A)
\[4.5\times {{10}^{10}}\text{ }cm/s\] done
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B)
\[2\times {{10}^{10}}\text{ }cm/s\] done
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C)
\[0.5\times {{10}^{10}}\text{ }cm/s\] done
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D)
\[1.5\times {{10}^{10}}\text{ }cm/s\] done
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question_answer11)
Velocity of light in vacuum is
A)
\[13\times \text{1}{{\text{0}}^{6}}m/s\] done
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B)
\[3\times {{10}^{10}}\text{ }m/s\] done
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C)
\[3\times {{10}^{8}}m/s\] done
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D)
3 x 105 m/s done
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question_answer12)
When a light travels from one medium to another medium which are separated by sharp boundary, the characteristic which does not change is
A)
Velocity done
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B)
Wave length done
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C)
Frequency done
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D)
Amplitude done
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question_answer13)
A plane mirror reflecting a ray of incident light is rotated through an angle \[\theta \], about an axis through the point of incidence, in the plane of the mirror perpendicular to the plane of incidence. Then (i) The reflected ray does not rotate (ii) The reflected ray rotates through an angle \[\theta \] (iii) The reflected ray rotates through an angle \[2\theta \] (iv) The incident ray is fixed
A)
Only (i) is correct done
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B)
(i) and (iii) are correct done
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C)
(iii) and (iv) are correct done
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D)
(ii) and (iv) are correct done
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question_answer14)
A ray of light is incident on a plane mirror at an angle of incidence of 30°. The deviation produced by the mirror is
A)
\[{{30}^{o}}\] done
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B)
\[{{60}^{o}}\] done
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C)
\[{{90}^{o}}\] done
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D)
\[{{120}^{o}}\] done
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question_answer15)
If the velocity of light in vacuum is c cm/s, then the velocity of light in a medium of refractive index 1.5 is __
A)
1.5 c done
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B)
c done
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C)
c/1.5 done
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D)
can have any velocity done
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question_answer16)
The light appears to travel in straight line because
A)
It consists of small particles done
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B)
The velocity of light is very large done
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C)
The wavelength of light is very small done
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D)
Light is reflected by surroundings done
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question_answer17)
The number of images observable between two parallel mirrors is
A)
12 done
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B)
4 done
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C)
16 done
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D)
infinite done
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question_answer18)
A plane mirror is approaching you at 10 cm per second. You can see your image in it. At what speed will your image approaches you.
A)
5 cm/s done
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B)
25 cm/s done
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C)
20 cm/s done
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D)
15 cm/s done
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question_answer19)
A light bulb is placed between two plane mirrors inclined at an angle of \[{{60}^{o}}.\]The number of images formed are
A)
6 done
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B)
12 done
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C)
5 done
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D)
4 done
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question_answer20)
Let the incident ray be fixed. Now, if a plane mirror is rotated through an angle of \[{{20}^{o}}\] about an axis lying in its plane, then the reflected ray turns through an angle
A)
\[{{60}^{o}}\] done
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B)
\[{{40}^{o}}\] done
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C)
\[{{10}^{o}}\] done
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D)
\[{{30}^{o}}\] done
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question_answer21)
A clock hung on a wall of a hall has marks instead of numerals on its dial. On the opposite wall, there is a plane mirror and the image of the clock in the mirror indicates the time 7.40. hence, the time on the clock is
A)
7.40 done
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B)
4.20 done
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C)
5.40 done
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D)
10.7 done
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question_answer22)
A ray of light that falls on an eye first passes through the
A)
pupil done
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B)
cornea done
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C)
eye lens done
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D)
aqueous humour done
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question_answer23)
The focal length of the eye lens is adjusted by the
A)
vitreous humour done
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B)
aqueous humour done
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C)
ciliary muscles done
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D)
optic nerves done
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question_answer24)
The ciliary muscles of the human eye contract and relax in order to
A)
adjust the size of the eyeball done
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B)
adjust the focal length of the lens done
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C)
control the amount of light entering the eye done
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D)
prevent foreign elements from entering the eye done
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question_answer25)
Tina has a defect in her eyes. She is not able to contract her iris properly. As a result of the defect in her eyes, Tina will not be able to see
A)
in dim light done
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B)
near objects done
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C)
in bright light done
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D)
distant objects done
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question_answer26)
The image formed by the eye lens on the retina is
A)
real, inverted, and large done
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B)
virtual, erect, and large done
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C)
real, inverted, and diminished done
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D)
virtual, erect, and diminished done
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question_answer27)
Myopia is a defect of vision caused by
A)
a decrease in the retinal distance from the lens done
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B)
a decrease in the diameter of the eyeball done
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C)
an increase in the thickness of the lens done
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D)
an increase in the curvature of the lens done
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