Engineering Entrance Sample Papers

Questions on Microscope and Telescope

Microscope and Telescope mcqs

Questions and Answers of Microscope and Telescope:

Ques: A Galileo telescope has an objective of focal length 100 cm and magnifying power 50. The distance between the two lenses in normal adjustment will be
(a) 98 cm
(b) 100 cm
(c) 150 cm
(d) 200 cm
Ans. (a)

Ques: An astronomical telescope has objective and eye-piece lens of powers 0.5 D and 20 D respectively, its magnifying power will be
(a) 8
(b) 20
(c) 30
(d) 40
Ans. (d)

Related: Physical World and Measurement MCQ

Ques: A Galileo telescope has an objective of focal length  and magnifying power 50. The distance between the two lenses in normal adjustment will be
(a) 96 cm
(b) 98 cm
(c) 102 cm
(d) 104 cm
Ans. (b)

Ques: A telescope has an objective of focal length 50 cm and an eye piece of focal length 5 cm. The least distance of distinct vision is 25 cm. The telescope is focussed for distinct vision on a scale 200 cm away. The separation between the objective and the eye-piece is
(a) 75 cm
(b) 60 cm
(c) 71 cm
(d) 74 cm
Ans. (c)

Ques: The focal lengths of the objective and eye-piece of a telescope are respectively 100 cm and 2 cm. The moon subtends an angle of 0.5o at the eye. If it is looked through the telescope, the angle subtended by the moon’s image will be
(a) 10o
(b) 50o
(c) 25o
(d) 10o
Ans. (c)

Ques: An astronomical telescope of ten-fold angular magnification has a length of 44 cm. The focal length of the objective is
(a) 4 cm
(b) 40 cm
(c) 44 cm
(d) 440 cm
Ans. (b)

Related: Arithmetic and Geometric Progressions Problem

Ques: A Gallilean telescope has objective and eye-piece of focal lengths 200 cm and 2 cm respectively. The magnifying power of the telescope for normal vision is
(a) 90
(b) 100
(c) 108
(d) 198
Ans. (b)

Ques: The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and the eye-piece is found to be 20 cm. The focal length of the two lenses are
(a) 18 cm, 2 cm
(b) 11 cm, 9 cm
(c) 10 cm, 10 cm
(d) 15 cm, 5 cm
Ans. (a)

Ques: Large aperture of telescope are used for
(a) Large image
(b) Greater resolution
(c) Reducing lens aberration
(d) Ease of manufacture
Ans. (b)

Ques: The aperture of the objective lens of a telescope is made large so as to
(a) Increase the magnifying power of the telescope
(b) Increase the resolving power of the telescope
(c) Make image aberration less
(d) Focus on distant objects
Ans. (a)

Related: Practice Problems Chemical Equilibrium

Ques: The focal length of the objective of a terrestrial telescope is 80 cm and it is adjusted for parallel rays, then its magnifying power is 20. If the focal length of erecting lens is 20 cm, then full length of telescope will be
(a) 84 cm
(b) 100 cm
(c) 124 cm
(d) 164 cm
Ans. (d)

Ques: A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focussed on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle 2o at the objective, the angular width of the image
(a) 10o
(b) 24o
(c) 50o
(d) 1/6o
Ans. (b)

Ques: The image formed by an objective of a compound microscope is
(a) Virtual and enlarged
(b) Virtual and diminished
(c) Real and diminished
(d) Real and enlarged
Ans. (d)

Ques: Resolving power of a microscope depends upon
(a) Wavelength of light used, directly
(b) Wavelength of light used, inversely
(c) Frequency of light used
(d) Focal length of objective
Ans. (b)

Related: Free Biology Practice Questions with Solutions for NEET

Ques: An observer looks at a tree of height 15 m with a telescope of magnifying power 10. To him, the tree appears
(a) 10 times taller
(b) 15 times taller
(c) 10 times nearer
(d) 15 times nearer
Ans. (c)

Ques: If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
(a) Decreases
(b) Increases
(c) Gets halved
(d) Remains unchanged
Ans. (b)

Ques: A person using a lens as a simple microscope sees an
(a) Inverted virtual image
(b) Inverted real magnified image
(c) Upright virtual image
(d) Upright real magnified image
Ans. (c)

Ques: Resolving power of a microscope depends upon
(a) The focal length and aperture of the eye lens
(b) The focal lengths of the objective and the eye lens
(c) The apertures of the objective and the eye lens
(d) The wavelength of light illuminating the object
Ans. (d)

Related: AIIMS Chemistry Practice Question Paper

Ques: When the length of a microscope tube increases, its magnifying power?
(a) Decreases
(b) Increases
(c) Does not change
(d) May decrease or increase
Ans. (a)

Ques: In order to increase the magnifying power of a compound microscope
(a) The focal lengths of the objective and the eye piece should be small
(b) Objective should have small focal length and the eye piece large
(c) Both should have large focal lengths
(d) The objective should have large focal length and eye piece should have small
Ans. (a)

Ques: For which of the following colour, the magnifying power of a microscope will be maximum
(a) White colour
(b) Red colour
(c) Violet colour
(d) Yellow colour
Ans. (c)

Ques: Finger prints are observed by the use of
(a) Telescope
(b) Microscope
(c) Gallilean telescope
(d) Concave lens
Ans. (b)

Related: AEEE Practice Mathematics Question Bank

Ques: Microscope is an optical instrument which
(a) Enlarges the object
(b) Increases the visual angle formed by the object at the eye
(c) Decreases the visual angle formed by the object at the eye
(d) Brings the object nearer
Ans. (b)

Ques: In a compound microscope, the intermediate image is
(a) Virtual, erect and magnified
(b) Real, erect and magnified
(c) Real, inverted and magnified
(d) Virtual, erect and reduced
Ans. (c)

Ques. The focal length of objective of a telescope is 60 c.m. To obtain a magnification of 20, the focal length of the eye-piece should be
(a) 2cm
(b) 5cm
(c) 4cm
(d) 3cm
Ans. (d)

Share with your Friends...
Share on Facebook
Facebook
Tweet about this on Twitter
Twitter
Share on LinkedIn
Linkedin
Pin on Pinterest
Pinterest
Print this page
Print

About the author

Vishal Arora

Leave a Comment

1 Comment

  • There are two major types of what is the best microscope for cells, and these are digital and fixed. The digital one uses a computer to provide the images and it can be adjusted easily depending on the size of the cells to be viewed.