## Telescope-MCQ-Basic

Physics is an important subject in preparation for various Competitive exams.To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Telescope. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. The focal length of the objective and eyepiece of an astronomical telescope for normal adjustments are 50 cm and 5 cm. The length of the telescope should be

•  50 cm
•  55 cm
•  60 cm
•  45 cm lengths

55 cm

Q2. The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be

•  0.1 sec
•  0.2 sec
•  1.0 sec
•  0.6 sec

1.0 sec

Q3. The aperture of the objective lens of a telescope is made large so as to

•  Increase the magnifying power of the telescope
•  Increase the resolving power of the telescope
•  Make image aberration less
•  Focus on distant objects

Increase the resolving power of the telescope

Q4. To increase both the resolving power and magnifying power of a telescope

•  Both the focal length and aperture of the objective has to be increased
•  The focal length of the objective has to be increased
•  The aperture of the objective has to be increased
•  The wavelength of light has to be decreased

Both the focal length and aperture of the objective has to be increased

Q5. The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

•  – 40
•  – 48
•  – 60
•  – 100

– 48

Q6. Resolving power of reflecting type telescope increases with

•  Decrease in frequency of incident light
•  Increase in wavelength of incident light
•  Increase in diameter of objective lens
•  None of these

Increase in diameter of objective lens

Q7. The astronomical telescope consists of objective and eye-piece. The focal length of the objective is

•  Equal to that of the eye-piece
•  Greater than that of the eye-piece
•  Shorter than that of the eye-piece
•  √Five times shorter than that of the eye-piece
Greater than that of the eye-piece

Q8. A photograph of the moon was taken with telescope. Later on, it was found that a housefly was sitting on the objective lens of the telescope. In photograph

•  The image of housefly will be reduced
•  There is a reduction in the intensity of the image
•  There is an increase in the intensity of the image
•  The image of the housefly will be enlarged

There is a reduction in the intensity of the image

Q9. The magnifying power of a telescope is M. If the focal length of eye piece is doubled, then the magnifying power will become

•  2 M
•  M/2
•  0.25 M
•  3 M

M/2

Q10. When diameter of the aperture of the objective of an astronomical telescope is increased, its

•  Magnifying power is increased and resolving power is decreased
•  Magnifying power and resolving power both are increased
•  Magnifying power remains the same but resolving power is increased
•  Magnifying power and resolving power both are decreased

Magnifying power remains the same but resolving power is increased

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