## Gravitation QUIZ-5

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. As we go from the equator to the poles, the values of g
•  Remains the same
•  Decreases
•  Increases
•  Decreases up to a latitude of 45°
Solution

Q2.Spotthe wrong statement: The acceleration due to gravity 'g' decreases if
•  We go down from the surface of the earth towards its centre
•  We go up from the surface of the earth
•  We go from the equator towards the poles on the surface of the earth
•  The rotational velocity of the earth is increased
Solution
Value of g decreases when we go from poles to equator

Q3.  The earth revolves about the sun in an elliptical orbit with mean radius 9.3*107m in a period of 1 year . Assuming that there are no outside influences
•   The earth's kinetic energy remains
•  The earth's angular momentum remains constant
•  The earth's potential energy remains constant
•  All are correct
Solution
kinetic and potential energies varies with position of earth w.r.t sun. Angular momentum remains constant everywhere.

Q4. The escape velocity of a body from earth's surface is ve. The escape velocity of the same body from a height equal to 7R from earth's surface will be
•  ve2
•  ve2
•  ve22
•  ve4
Solution

Q5.The escape velocity from the earth is 11 kms-1.The escape velocity from a planet having twice the radius and the same mean density as the earth woud be
•  5.5 Kms-1
•  11 kms-1
•  15.5 kms-1
•  22 kms-1
Solution

Q6. If density of earth increased 4times and its radius become half of what it is, our weight will
•  Be four times its present value
•  Be doubled
•  Remain same
•  Be halved
Solution

Q7.The time period of a geostationary satellite is
•  12 hours
•  24 hours
•  6 hours
•  48 hours
Solution

Q8.The weight of a body on surface of earth is 12.6N. When it is raised to a height half the radius of earth its weight will be
•  2.8 N
•  5.6 N
•  12.5 N
•  25.2 N
Solution
Q9.Imagine a light plant revolving around a very massive star in circular orbit of radius r with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to r-5/2. Then the correct relation is
•  T2r5/2
•  T2r7/2
•  Tr5/2
•  T2r7/2
Solution
Q10. If V,R and g denote respectively the escape velocity from the surface of the earth radius of the earth, and acceleration due to gravity, then the correct equation is
•  V=gR
•  V=43gR3
•  V=Rg
•  V=2gR
Solution

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