## GRAVITATION QUIZ-7

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. The acceleration due to gravity is g at a point distant r from the centre of earth of radius R then
•  g∝r
•  g∝r2
•   g∝r-1
•   g∝r-2
Solution

Q2.In the following four periods (i) Time of revolution of a satellite just above the earth’s surface (Tst) (ii) Period of oscillation of mass inside the tunnel bored along the diameter of the earth (Tma) (iii) Period of simple pendulum having a length equal to the earth’s radius in a uniform field of 9.8N/kg(Tsp) (iv) Period of an infinite length simple pendulum in the earth’s real gravitational filed (Tis)
•  Tst>Tma
•  Tma>Tst
•  Tsp>Tis
•  Tst=Tma=Tsp=Tis
Solution

Q3.  The height from the earth surface at which the value of acceleration due to gravity reduces to 1/4th of its value at earth’s surface (assume earth to be sphere of radius 6400 km)
•   6400 Km
•  2649 Km
•  2946 Km
•  1600 Km
Solution

Q4. A space ship moves from earth to moon and back. The greatest energy required for the space ship is to overcome the difficulty in
•  Entering the earth's gravitational field
•  Take off from earths field
•  Take off from lunar surface
•  Entering the moon's lunar surface
Solution

Q5.If the mass of earth is 80 times of that of a planet and diameter is double that of planet and 'g' on earth is 9.8m/s2,then the value of 'g' on that planet is
•  4.9 m/s2
•  0.98 m/s2
•  0.49m/s2
•  49 m/s2
Solution

Q6. An iron ball and a wooden ball of the same radius are released from a height 'h'in vacuum.The time taken by both of them to reach the ground is
•  Unequal
•  exactly equal
•  Roughly equal
•  Zero
Solution

Q7.If gravitational force on a body of mass 1.5 kg at point is 45N, then the intensity of the gravitational field at that point is
•  67.5 N Kg-1
•  45 N Kg-1
•  30 N Kg-1
•  15 N Kg-1
Solution

Q8.A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is
•  Zero at that place
•  Is balanced by the force of attraction due to moon
•  equal to the centripetal force
•  Non-effective due to particular design of the satellite
Solution

Q9.A geostationary satellite is orbiting the earth at a height of 6R above the surface of the earth; R being the radius of the earth. What will be the time period of another satellite at a height 2.5 R from the surface of the earth?
•  62 h
•  62.5 h
•  63 h
•  12 h
Solution

Q10. If the radius of the earth shrinks by 1%, its mass remaining same , the acceleration due to gravity on the surface of earth will
•  Decrease by 2%
•  Decrease by 0.5%
•  Increase by 2%
•  Increase by 0.5%
Solution

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