If radius if earth is reduced to half without changing its mass, then match the following columns
`{:(,"Column-I",,"Column-II"),("(A)","Angular momentum of earth","(p)","Will become two times"),("(B)","Time period of rotation of earth","(q)","Will become four times"),("(C)","Rotational kinetic energy of earth","(r)","Will remain constant"),("(D)",,"(s)","None"):}`

If earth decreases its rotational speed. Match the following columns {:(,"Column-I",,"Column-II"),("(A)","Value of g at pole","(p)","Will remain same"),("(B)","Value of g at equator","(q)","Will increase"),("(C)","Distance of geostationary","(r)","Will decrease"),("(D)","Energy of geostationary satellite","(s)","Cannot say"):}

If earth decreases its rotational speed. Match the following columns {:(,"Column-I",,"Column-II"),("(A)","Value of g at pole","(p)","Will remain same"),("(B)","Value of g at equator","(q)","Will increase"),("(C)","Distance of geostationary","(r)","Will decrease"),("(D)","Energy of geostationary satellite","(s)","Cannot say"):}

Match the following columns {:(,"Column-I",,"Column-II"),("(A)",underset("satellite in circular orbit")("Time period of an earth"),"(p)","Independent of mass of satellite"),("(B)","Orbital velocity of satellite","(q)","Independent of radius of orbit"),("(C)","Mechanical energy of satellite","(r)","Independent of mass of earth"),(,,"(s)","None"):}

Match the following columns {:(,"Column-I",,"Column-II"),("(A)",underset("satellite in circular orbit")("Time period of an earth"),"(p)","Independent of mass of satellite"),("(B)","Orbital velocity of satellite","(q)","Independent of radius of orbit"),("(C)","Mechanical energy of satellite","(r)","Independent of mass of earth"),(,,"(s)","None"):}

If radius of earth becomes n times its present value, without change in mass, then duration of day becomes

If radius of the earth is reduced by n times without changing its mass, then what will be the magnitude of g'_e at the surface of earth?

If earth contracts such that its radius becomes half without change in mass, then wieght on earth becomes …... times.

If earth radius reduces to half of its present value then the time period of rotation will become:

If earth radius reduces to half of its present value then the time period of rotation will become:

Density of a planet is two times the density of earth. Radius of this planet is half. Match the following (as compared to earth) {:(,"Column-I",,"Column-II"),("(A)","Accleration due to gravity on this planet's surface","(p)","Half"),("(B)","Gravitational potential on the surface","(q)","Same"),("(C)","Gravitational potential at centre","(r)","Two times"),("(D)","Gravitational field strength at centre","(s)","Four times"):}