Question 1 :
If density of earth increases 4 times and its radius becomes half of what it is, our weight will:

Question 2 :
Centripetal force is provided by the real forces acting on the body in motion.<br>

Question 4 :
Where is the intensity of the gravitational field of the earth maximum?

Question 5 :
At a point very near earth's surface, the acceleration due to gravity is g. What will be the acceleration due to gravity at the same point if the earth suddenly shrinks to half its radius without any change in its mass?

Question 6 :
The ratio of electromagnetic and gravitational forces between two electrons is nearly, $($ Charge of the electron $e=1.6\times 10^{-19}$C, mass of the electron $m=9.1\times10^{-31}$kg, permittivity of free space $\dfrac{1}{4\pi\varepsilon _{0}}=9\times10^{9}$ Nm$^{2}$C$^{-2}$, universal gravitational constant $G=6.67\times10^{-11}$Nm$^{2}$kg$^{-2}$ $)$<br>

Question 9 :
The value of 'g' at a particular point is $ 9.8 m/s^2 $ suppose the earth suddenly shrinks uniformly to half its present size without any mass. The value of 'g' at the same point (assuming that the distance of the point from the center of earth does not shrink) will now be

Question 10 :
A hollow iron ball and a solid iron ball are dropped from the same height. Neglecting air resistance, which ball reaches the ground first?<br/>

Question 11 :
In which of the following cases, the net force is not zero?<br>

Question 12 :
Assertion: The value of acceleration due to gravity does not depend upon the mass of the body. Reason: Acceleration due to gravity is a constant quantity.

Question 13 :
The earth is an approximate sphere. If the interior contained matter which is not of the same density everywhere, then on the surface of the earth, the acceleration due to gravity :

Question 15 :
Assertion: Acceleration due to gravity at a place on earth remains constant for all objects Reason: Acceleration due to gravity doesn't depend on the mass of the object but only on mass of earth

Question 16 :
Which of the following forces is responsible for the flow of water in rivers?

Question 18 :
Which of the following is/are equations of motion for a body projected vertically upwards.<br/>

Question 19 :
The Earth does not move towards the Moon because the force exerted by the Earth or the Moon on each other is insufficient to move the Earth on account of its huge mass. This statement is

Question 20 :
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same :<br/>