Test series for Gravitation for Class IX physics/Science

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Test Series-23

Instructions

Your test contains 12 multiple choice questions with only one answer
This is 30 min test.Please make sure you complete it in stipulated time
You can Finish this test any time using 'Submit' button.
Once finished you get a chance to review all question with correct answers and their solutions.

1.What value of G in the formula of Gravitational force ?

depends on radius of earth
depends on radius of earth and mass of the earth
depends neither on radius of earth and mass of the earth
depends on mass of earth

Link Type comphrehension( Q2-Q4)
Two objects A and B are of mass m₁ and m₂ are seperated by the distance r. The Gravitational force between the objects is F
2) What will be Gravitational Force between the two objects if the mass of the one object is doubled

3. What will be Gravitational Force between the two objects if distance is increased two times? ?

4.What will be Gravitational Force between the two objects if distance is increased two times and both the masses are doubled?

5.which is these are the laws of Kepler? Given : Charge on electron=1.6X10^-19 coulombs

The cube of the mean distance of a planet from the sun is directly proportional to the square of time it takes to move around the sun
Each planet revolves around the sun in such a way that the line joining the planet to the sun sweeps over equal areas in equal interval of time
The planets move in the elliptical orbits around the sun with sun situated on one of the foci of the elliptical orbit
All the above

6. What is true of g?

it is vector quantity and has unit m/s²
it is scalar quantity and has unit m/s²
it is vector quantity and has unit m/s
it is scalar quantity and has unit m/s

7. The value of g at three places A,B,C which are above the surface of the earth are in the following order A > B > C what can be said about the distance of these places from the surface of the earth

A > B > C
A=B=C
C> B> A
None of the above

8. There are two statements A The weight of the body is not constant and it changes with acceleration due to gravity B The mass of the objects can never be zerp Which one of the following is correct?

A only
B only
Both A and B are correct
Both A and B are wrong

9.Two bodies fall from the same height on the surface of the earth ? Which body will strike the surface first

Heavier body
lighter body
Both will reach same at the same time
none of these

10.Why will a sheet of paper fall slower than one that is crumpled into a ball?

The sheet of paper expeirence more air resistance then crumpled one
The crumpled one will have more gravitional force then sheet of paper
None of these

Link Type comphrehension( Q11-Q12)
A ball is thrown vertically upwards with a velocity of 49 m/s.
g=9.8 m/s² 11. Calculate the max height it rises up to?

112.5m
245m
122.5m
none of thes

12. Calculate the total time it takes to reach back to surface?

20 sec

15sec

5 sec

10sec

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