## Newton’s law of gravitation-Basic

Compared to other sections, Physics is considered to be the most scoring section. If prepared thoroughly, Physics can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The force of gravitation is

•  Repulsive
•  Electrostatic
•  Conservative
•   Non - conservative

Conservative

Q2. If the distance between two masses is doubled, the gravitational attraction between them

•  Is doubled
•  Becomes four times
•  Is reduced to half
•  Is reduced to a quarter

Is reduced to a quarter

Q3. A mass M is split into two parts, m and M – m, which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

•  1/3
•  1/2
•  1/4
•  1/5

1/2

Q4. Three particles each of mass m are placed at the three corners of an equilateral triangle. The centre of the triangle is at a distance x from either corner. If a mass M be placed at the centre, what will be the net gravitational force on it

•  Zero
•  3GMm
•  2GMm
•  GMm

Zero

Q5. The diameters of two planets are in the ratio 4 : 1 and their mean densities in the ratio 1: 2. The acceleration due to gravity on the planets will be in ratio

•  1:2
•  2:3
•  2:1
•  4:1

2:1

Q6. A mass 'm' is taken to a planet whose mass is equal to half that of earth and radius is four times that of earth. The mass of the body on this planet will be

•  m/2
•  m/8
•  m/4
•  m

m

Q7. The main difference between a stretched membrane and the liquid surface is

•  The liquid surface has a tendency to contract but the stretched membrane does not
•  The surface tension does not depend on area but on the tension of the stretched membrane does
•  The surface tension increases with increases in area
•  Surface tension increases irregularly with temperature

The surface tension does not depend on area but on the tension of the stretched membrane does

Q8. A hollow disc of aluminum whose external and internal radii are R and r respectively, is floating on the surface of a liquid whose surface tension is T. The maximum weight of disc can be

•  2p (R + r) T
•   2p (R – r) T
•  4p (R + r) T
•   4p (R – r) T

2p (R + r) T

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