18) Observing Space: Telescopes
IMPORTANT POINTS:
Light is an electromagnetic wave. Our eyes can see only that light which has between 400 nm to 800 nm The telescopes made using two or more lenses are called refracting telescopes >The images formed by the refracting telescopes have chromatic aberrations. So refer telescopes are used. In these telescopes, large mirrors are used ▸ Reflecting telescopes are mainly of two types: (1) Newtonian telescopes and (2) Cassegra telescopes. In Newtonian telescopes, a concave and a plane mirror is used along with a convex lens w Cassegrainian telescopes, a concave mirror and a convex mirror is used along with a conve The biggest optical telescope in India, having a mirror of 3.6 m diameter is situated in the Ary Research Institute of Experimental Sciences, Nainital. This is the largest optical telescope ▸ Radio telescopes collect the radio waves emitted by heavenly objects and with the help puters the image of the heavenly body is constructed. A large radio telescope called the Giant Meterwave Radio Telescope (GMRT) is e Narayangaon near Pune. Scientist from all over the world come to India to make use of th The earth-based telescopes have some limitations (1) Light coming from the heavenly absorbed in the atmosphere to great extent and a clear image is not obtained. (2) Due t in atmospheric pressure and temperature, the light waves change their path continuou image obtained is shaky (3) Due to sun light, optical telescopes cannot be used duri City lights and clouds make it difficult to use the telescopes at night also. To solve thes partially, telescopes can be mounted on top of mountains or at uninhabited places. If e are to be solved completely, then the telescopes must be placed in the space. The National Aeronautics and Space Administration (NASA) launched into scope called the Hubble telescope
****SPECIMEN QUESTIONS ****
(1)The wave length of the visible light is 10 400 nm, 800 nm
(2) 200 nm-600 nm
(3) 300 nm, 700 nm
(4) 800 nm, 1000 nm
Explanation: The wave length of the visible light is 400 to 800 nm. mers
Option 1 is correct.
(2) The diameter of the largest optical telescope in Asia is
(1)56m
(2) 3.6m
(3) 2.6 m
(4) 6.3 m
Explanation: The biggest optical telescope in India, having a mirror of 3.6 m diameter is situated in the Aryabhatta Research Institute of Experimental Sciences, Nainital. This is the largest optical telescope in Asia.
Option 2 is correct.
QUESTIONS FOR PRACTICE
(1) Optical telescope: Hubble :: Indian Radio telescope:
(1) Chandra
(2) GMRT
(3) Newtonian telescope
(4) NASA
Ana-(2) GMRT
The wave length of ultra violet rays is-
(1) 300 pm-400 nm
(2) 400 nm-800 nm
(3) 3 pm-300 pm
(4) less than 3 pm
Ana-(1) 300 pm-400 nm
(3) In the optical telescope, reflection of light takes place from a concave mirror, so this telescope is called as ―
(1) refracting telescope
(2) radio telescope
(3) reflecting telescope
(4) X-ray telescope
Ana-(3) reflecting telescope
(4) In Newtonian telescope used. and is
(1) concave mirror, convex mirror
(2) concave mirror, plane mirror
(3) convex mirror, plane mirror
(4) concave lens, convex lens
Ana-(2) concave mirror, plane mirror
(5) The telescopes those collect radio waves are called
(1) Radio telescopes
(2) optical telescopes
(3) X-ray telescopes
(4) Newtonion telescope
Ana-(1) Radio telescopes
(6) Refracting telescope: convex lens :: reflecting telescope:
(1)concave lens
(2) prism
(3) parabolic dish
(4) concave morror
Ana-(4) concave morror
The largest optical telescope in Asia is situated at in India.
(1) Nainital
(2) Narayangaon
(3) Nagpur
(4) Delhi
Ana-(1) Nainital
(8) In Cassegrainian telescope and are used. (1)concave mirror, convex mirror
(2) convex mirror, plane mirror
(3) concave mirror, plane mirror
(4) plane mirror, concave lens
Ana-(1)concave mirror, convex mirror
(9) The Indian organization successfully launched many satellites. has
(1) NASA
(2) GMRT
(3) ISRO
(4) GSAT
Ana-(3) ISRO
(10) X-ray telescope: Chandra :: Optical telescope:
(1)GMRT
(2) Hubble
(3) Surya
(4) PSLV
Ana-(2) Hubble
(11) The- -satellite series is used for the monitoring and management of natur sources and disaster management.
(1) INSAT
(2) GSAT
(3) IRS
(4) EDUSAT
Ana-(3) IRS
(12) The NASA has launched an optical telescope- into the space.
(1) GMRT
(2) Hubble
(3) Chandra
(4) PSLV
Ana-(2) Hubble
(13) - is the radio telescope which has been erected at Narayangaon.
(1) PSLV
(2) Hubble
(3) Chandra
(4) GMRT
Ana-(4) GMRT
(14) Disaster management : IRS Meteorological services:
(1) PSLV
(2) EDUSAT
(3) GSAT
(4) MRT
Ana-(3) GSAT
(15) In 2015, ISRO launched an artificial satellite called, which has ultra-violet and X-ray telescopes and detectors.
(1) Astrosat
(2) Chandra
(3) Hubble
(4)
Ana-(1) Astrosat
(16) An X-ray telescope launched by NASA the space is name after Indian scientist. ves
(1) Jagdishchandra Bose
(2) Chandrasekhar Subramanian
(3) Jayant Naralikar ope
(4) Raghunath Mashelkar
Ana-(2) Chandrasekhar Subramanian
(17) GMRT uses-
(1) X-rays
(2) microwaves
(3) infrared waves
(4) radio waves
Ana-(4) radio waves
(18) The wavelength of is the maximum among the waves given below. is
(1) visible light rays
(2) microwaves
(3) radio waves
(4) ultraviolet waves
Ana-(3) radio waves
(19) 1 nm=-metre.
(1)10
(2) 10-
(3) 10-10
(4) 10
Ana-(1)10
(20) satellite series is exclusively used for education.
(1) MEDUSAT
(2) INSAT
(3) GSAT
Ana-(1)MEDUSAT
कोणत्याही टिप्पण्या नाहीत:
टिप्पणी पोस्ट करा