As the Earth goes around the sun, it would cause the position of the pole star (and other stars) to move with a regular annual motion. Q3. In particular, they know about the north star, with its formal name of Polaris. Report ; Posted by Wangseng Lowang 2 weeks, 2 days ago. Explain, with the help of diagram, how is moon visible to us when it does not have light of its own? Tonight’s chart shows Polaris and the Big and Little Dippers for a September evening. Draw the diagram to show the position of different planets of the solar system. What's more, the star we know as Polaris hasn't been the only North Star. 22. Q2. In order to identify its location, the first two stars of the ‘Saptarishi Mandal’ are joined by an imaginary line which, after its extenuation, joins the Pole Star on the North Pole. – 5 marks Q.73. Indeed, the "pole star" used by ancient Greek sailors was a different one, not nearly as close to the celestial pole. Morning star is the name given to (a) pole star (b) star … Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). The more distant a star is, the less it appears to move. How can this defect of vision be corrected ? Trusted by 70 Lakh Students. Why pole star is stationary? (ii) necessary chemical equations representing the chemical changes occurring during the process. Imagine a straight line passing through these stars. Answer: Question 7. – 5 marks Q.37 State the differences between eukaryotes and prokaryotes. Q23: Explain how you can locate pole star with the help of Ursa Major. 3.4. The pole star in particular moves by about 2.1 millionth of a degree. Describe the extraction of iron from the concentrated ore with the help of (i) a labelled diagram of the furnace used. Some comets and small asteroids orbit the Sun in retrograde orbits. The Phasor Diagram of the Capacitor Start motor is shown below. Re: Explain position of pole star over different latitudes « Reply #25 on: January 07, 2011, 09:41:06 PM » You guys obviously can't fit the FE theory around these observations and for the most part (with the exception of a PM I received) display a willful ignorance of the essence of the questions themselves. Ask: How do our rooms get light in the daytime? Thus, a single phase supply current is split into two phases. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Can we hear any sound on moon? Answer: No, the earth rotates on its axis from west to east. (a) (i) Explain the various parameters that influence the design of a satellite communication link. Stargazers are familiar with the concept of the "pole star". 3.4: The phasor diagram of a salient-pole synchronous generator. Note. Explain with the help of diagram how the tilt of the earth’s axis and the revolution cause. This can be understood with the help of the given diagram. Imagine the two stars at … It doesn't rise or set. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). Question 1. Q.68. The resulting phasor diagram is shown in Fig. Also, the pole star just happens to be very close to the axis of the Earth's rotation. Q5. Soln: Locate the two end stars of Ursa Major. When earth rotates about its axis in a day and revolves about the Sun, the part of sky changes that can be seen. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). You can use the Big Dipper to find Polaris, which is also known as the North Star… Q.69. Explain, why can we see full moon on a full moon day while it is not visible on a new moon day? Therefore, all the stars in the sky (except the pole star) seem to move from east to west. Explain how it occurs. Q.74. Q.67. (a) Explain with the help of a diagram the phenomenon of lightning between clouds (3+2=5) and the earth. Answer: Pole star can be located with the help of two stars at the end of Ursa Major. 12. (iii) With the help of a neat labelled diagram, explain construction and working of a auto-transformer starter used for starting 3-phase induction motor. Explain with a diagram how you can locate pole star with the help of the constellation Great Bear (Ursa Major). OR (a) What is an earthquake? 0 o) the Pole Star will be in line with the horizon, i.e. Explain their pattern and positions in the sky. (iv) With the help of a neat labelled diagram, explain it will have an angle of elevation or altitude of 0 o. For observers in the northern hemisphere and parts of the southern hemisphere, Polaris (formally known as α Ursae Minoris because it's the brightest star in the constellation), is an important navigational aid. I M is the current in the main winding which is lagging the auxiliary current I A by 90 degrees as shown in the phasor diagram above. Long Answer Type Questions. Answer. Explain that we can see objects because they reflect light. Fig. Pole Star is located by Ursa Major. Describe the alternative sources of energy. variation in the length of day and night; and; changes in the altitude … asked Jul 27, 2018 in Science by Sakil Alam (64.0k points) stars and the solar system; class-8; 0 votes. This portal is designed to support Students and Teachers of Central Board of Secondary Education. 25. 10 Explain the operation of the following instructions in 8085 microprocessor : 3+3+4=10 (1) RRC (2) CMPR (3) LDAX Rp 4. The vocal folds (vocal cords) are a vibrating valve that chops up the airflow from the lungs into audible pulses that … A star trail is a type of photograph that uses long exposure times to capture the apparent motion of stars in the night sky due to Earth's rotation.A star-trail photograph shows individual stars as streaks across the image, with longer exposures yielding longer arcs.. CBSE Guess having millions of pages of educational papers provided by various educational institutions, teachers and educators from India and abroad. I've been tinkering with a few diagrams in an attempt to illustrate the motion of the solar system in its journey around the Milky Way. The lung (the pump) must produce adequate airflow and air pressure to vibrate vocal folds (this air pressure is the fuel of the voice). Extend the imaginary line in North direction. With reference to Earth, pole star in the sky does not seem to move because it is located above the axis of rotation of the Earth in the north direction. Explain with the help of diagram. Explain. The pole star to which the axis points now (within about one degree) used to be distant from the pole, and will be so again in a few thousand years (for your information, the closest approach is in 2017). With the help of diagrams on the board, explain the reflection of light. Explain how you can locate the Pole Star with the help of Ursa Major. Start studying Astronomy of the Solar System Quizes 1,2,3 & 5. On a clear moonless sky during summer at 9.00 p.m. at the northern part of sky we can see Ursa Major. With the help of neat diagrams explain the construction of a 3-phase induction motor. (ii)Extend this imaginary line towards the North direction. Use diagrams on the board to explain the scattering of light. What are the natural resources? The apparent motion of most celestial objects is from east to west, but it is possible to observe a body moving west to east, such as an artificial satellite or space shuttle that orbiting eastward. Learn vocabulary, terms, and more with flashcards, games, and other study tools. We can locate the pole star with the help of Ursa Major in the following way: (i) Draw an imaginary line from the two end stars of Ursa Major. Title: Chapter 17 Solar system.pmd Author: dtpcell6 Created Date: Ans: Yes. Draw a neat diagram for a star-delta starter and explain. The North Star, Polaris, is depicted as a triple star system in this artist’s conception, based on images taken with the Hubble Space Telescope. Explain how you can locate the Pole star with the help of Ursa Major. What causes global warming? Q4. Stars visible in the North Pole will not be visible in the South Pole. CBSE > Class 08 > Science 1 answers; myCBSEguide. This line is about five times the distance between two stars. 12/04/18. Assume that the Pole Star (Polaris) is exactly in line with the Earth’s axis produced, as shown in the following diagram. Instead, it appears to stay put in the northern sky. Click here to download the NCERT Exemplar Class 8 Science Unit 17 Stars and Solar System How does light help us to see things? seasons. Explain with diagram any one method of starting a slip ring induction motor. Q.72. Describe natural and human activities that causes deforestation. These are the exception, rather than the rule, for the motion of celestial objects. CBSE > Class 08 > Science 1 answers; How can stay pole star in an one direction. Comment. Q6.Give reasons for the following:- Extend this imaginary line towards the north direction. Q.70. Imagine a straight line passing through these stars as shown in the figure below. I also wanted portray how the celestial, ecliptic and galactic coordinate systems are related to each other in … Soln: For locating, the pole stars in the sky, first the big dropper or the Ursa Major constellation must be found . In this phasor diagram, the armature current needs to be resolved into two components - one in parallel with E A set and explain each one with the help of suitable example. (b) Write any two precautions that you will take to protect yourself from lightning when you are in the playground. The location of the Pole Star is fixed. explain the effect of rotor circuit resistance on different torques of an induction motor. 1 answer. The bowl of the big dipper consists of the four bright stars. Report ; Posted by Ranjushree Goswami 2 years, 7 months ago. Q.71. 1. – 5 marks Q.38 Describe with the help of a diagram an instrument which can be used to detect a charged body. With the help of a diagram describe the heat zones. What is deforestation? 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