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Physics: Topic-wise Test- 7 - NEET MCQ


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30 Questions MCQ Test - Physics: Topic-wise Test- 7

Physics: Topic-wise Test- 7 for NEET 2024 is part of NEET preparation. The Physics: Topic-wise Test- 7 questions and answers have been prepared according to the NEET exam syllabus.The Physics: Topic-wise Test- 7 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics: Topic-wise Test- 7 below.
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Physics: Topic-wise Test- 7 - Question 1

The sun subtends an angle of half a degree at the pole of a concave mirror which has a radius of curvature of 15 metres. Then the size (disameter) of the image
of the sun formed by the concave mirror is

Detailed Solution for Physics: Topic-wise Test- 7 - Question 1

 

θ = (1/2)o

= [π/2]/180

= π/360rad
The image of sun is formed at focus.
θ = d/f

⇒ d = fθ

= 15/2 × π/360

= 0.0654m
=6.54cm

Physics: Topic-wise Test- 7 - Question 2

A ray of light strikes a plane mirror PQ at an angle of incidence of 30, is reflected from the plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: Draw a ray diagram to illustrate your answer. 

Detailed Solution for Physics: Topic-wise Test- 7 - Question 2

Ray AB strikes the mirror PQ at B and gets reflected along BC according to the laws of reflection. The ray BC incident on mirror QR makes an angle 300 with the mirror. So, the angle of incidence on this mirror is 900 −300 = 600 . Hence, the angle of reflection is also 600

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Physics: Topic-wise Test- 7 - Question 3

A ray of ligth makes an angles of with the horizontal and strikes a plane mirror which is inclined at an angle to the horizontal.The angl for which
the reflected ray becomes vertical, is

Detailed Solution for Physics: Topic-wise Test- 7 - Question 3

50o + θ = 90o
θ=40o

Physics: Topic-wise Test- 7 - Question 4
A motor car is fitted with a convex driving mirror of focal length 20 cm. A second motor car 2 m broad and 1.6 m high is 6 m away from the first car. Then the position of the second car as seen in the mirror of the first car is
Physics: Topic-wise Test- 7 - Question 5
Figure shows two rays A and B being reflected by a mirror and going as A’ and B’
the mirror 
Detailed Solution for Physics: Topic-wise Test- 7 - Question 5
A and B are parallel rays and after reflection A' and B' also parallel, that's happen when rays reflected by plane mirror. in other case after reflection rays will not be parallel.
Physics: Topic-wise Test- 7 - Question 6

If the critical angle for total internal reflection from a medium to vacuum is 30°
the velocity of light in the medium is

Physics: Topic-wise Test- 7 - Question 7

The minimum deviation for a ray of light through a prism is 44° and when this happens the angle of incidence is  50° The refracting angle of the prism is

Physics: Topic-wise Test- 7 - Question 8

Two immiscible transparent liquids of refractive indices 1.5 and 4/3 are arranged as shown in figure. The apparent depth of mark at the bottom from top surface is

Detailed Solution for Physics: Topic-wise Test- 7 - Question 8

Physics: Topic-wise Test- 7 - Question 9
A cube of side a made of a material of refractive index is immersed in a liquid of refractive index A ray is incident on face AB at an angle as shown. Total internal reflection just takes place at point P on face BC. Then
Physics: Topic-wise Test- 7 - Question 10
X is a small angled prism of angle made of a material of refractive index 1.5. A ray of light is made incident as shown in figure. M is a plane mirror.The angle of deviation for the ray reflected from the mirror. M with respect to incident ray is
Physics: Topic-wise Test- 7 - Question 11
The face AC of a prism ABC of refracting angle is silvered. A ray is incident on face AB at an angle of as shown in figure. The refracted ray undergoes reflection on face AC and retraces its path.The refractive index of the prisms is
Physics: Topic-wise Test- 7 - Question 12
If half the body of a lens is covered with black paper the image produced by the lens will
Physics: Topic-wise Test- 7 - Question 13
When a lens is inserted between an object and a screen which are at a fixed distance apart, the size of the image is either 6 cm, or 2/3 cm. The size of the object in cm is
Physics: Topic-wise Test- 7 - Question 14
What is the focal length of a double convex lens for which the radius of curvature of each surface is 40cm ?
Physics: Topic-wise Test- 7 - Question 15
An object 20 cm high produces using a lens a real image of 80cm.When an object is shifted by 5 cm a real image 40 cm high is produced.The power of the lens is
Physics: Topic-wise Test- 7 - Question 16

When the object is at a distance x1 and x2, a real and a virtual image of the same size are formed respectively. The focal length of the convex lens is

Physics: Topic-wise Test- 7 - Question 17
The graph shows the variation of magnification M produced by a convex thin lens with image distance V. What was the focal length of the lens used ?
Physics: Topic-wise Test- 7 - Question 18
A thin symmetric convex lens of refractive index of the material 1.5 and radius of curvature 0.5 metre is immersed in water of refractive index 4/3. Its focal
length will be
Physics: Topic-wise Test- 7 - Question 19
An isotropic source of 2 candela produces a light flux equal to
Physics: Topic-wise Test- 7 - Question 20
A lamp is hanging at a height 40 cm from the centre of a table. If its height is increased by 10 cm, the illuminance on the table will decrease by
Physics: Topic-wise Test- 7 - Question 21
The intensity of light at a distance r from the axis of a long cylindrical source is proportional to
Physics: Topic-wise Test- 7 - Question 22
Chromatic aberrations in the formation of images by a lens arise because
Physics: Topic-wise Test- 7 - Question 23
The focal length of a lens of flint glass of dispersive power 0.45 which will render achromatic a converging lens of crown glass of focal length 75cm and dispersive power 0.21 is
Physics: Topic-wise Test- 7 - Question 24
The magnifying power of telescope can be increased by
Physics: Topic-wise Test- 7 - Question 25
A movie projector projects an image of length 3.5 m of a 35 mm. movie film on a screen. Neglecting absorption of light by the film and the air, the ratio of the illumination on the screen is
Physics: Topic-wise Test- 7 - Question 26
The ƒ number of a camera lens is 4.5. Which of the following statements is correct ?
Physics: Topic-wise Test- 7 - Question 27
A n a s t r o n o mi c a l t e l e s c o p e h a s a n a n gu l a r magnification of magnitude 5 for distant objects. The separation between the objective and the eye piece is 36 cm and the final image is formed at infinity. The focal length of the objective and of the eye piece are
Physics: Topic-wise Test- 7 - Question 28
The focal length of a simple convex lens used as a magnifier is 10 cm. For the image to be formed at a distance of distinct vision (D = 25 cm), the object
must be plced away from the lens at a distance of
Physics: Topic-wise Test- 7 - Question 29

A person can see objects only at distance greater than 40 cm. He is advised to use lens of power

Physics: Topic-wise Test- 7 - Question 30
The resolution limit of eye is 1 minute. At a distance of x km from the eye, two persons stands with a lateral separation of 3 metres. For the two persons
to be just resolved by the naked eye, x should be
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