Gravity

Normally the datum used for gravity surveys is sea level and gravity decrease ______ mGal for every meter above sea level

In which of these can you find acceleration?

• Running

• Throwing a ball

• Cycleing

• Driving

The force of attraction between two unit point masses separated by a unit distance is called

• universal gravitational constant

• gravitational field

• acceleration due to gravity

• gravitational potential

The atmosphere is held to the earth by

• earth’s magnetic field

• clouds

• gravity

• wind

The weight of an object at the centre of the earth of radius R is

• R times the weight at the surface of the earth

• infinite

• zero

The value of acceleration due to gravity

• is same on equator and poles

• is least on poles

• is least on equator

• increases from pole to equator

A planet (P) is moving around the Sun (S) in an elliptical orbit. As the planet moves from aphelion to perihelion, the Sun’s gravitational force

• does positive work on the planet.

• does negative work on the planet.

• does positive work on the planet during part of the motion and negative work during the other part.

• does zero work on the planet at all points between aphelion and perihelion.

Which of the following includes in spatial variations in gravity corrections?

i. Bouguer correction

ii. Terrain correction

iii. Free-air correction

iv. Tidal correction

• i, ii and iii

• ii, iii and iv

• i, iii and iv

• i, ii, iii and iv

Which of the following statements bout gravitational force is NOT correct?

• It is experienced by all bodies in the universe.

• It is a dominant force between celestial bodies

• It is a negligible force for atoms.

• It is the same for all pairs of bodies in our universe.

Which one of the materials has the highest density value?

• Quartzite 

• Shale 

• Basalt 

• Pyrite