Question 1 :
The acceleration due to gravity on the surface of a planet, whose mass and diameter are double that of the earth, is____  $\times 10^{-1}$ times the acceleration due to gravity on the surface of the earth.

Question 4 :
The value of universal gravitational constant $'G'$ was first experimentally determined by :

Question 5 :
Find the weight of an object at neptune which weighs $19.6 N$ on the earth. Mass of Neptune $= 10^{26} kg$, radius $R = 2.5 \times 10^4 km$ and rotates once around its axis in $16h.$

Question 6 :
A group of students is designing an experiment to verify earth's freefall acceleration rate. They plan to evacuate the air from a bell jar using a vacuum pump, and then use a remotely controlled apparatus within the vacuum to drop a spherical metal object from rest. The group does not have a means to directly measure the sphere's acceleration rate, so they instead plan to measure other quantities about the sphere and its motion, and then will calculate an experimental value&#160; for acceleration.<br/>Which one of the following options of measurements would provide the group with enough information to determine the sphere's acceleration rate, without making any unnecessary additional measurement?

Question 7 :
The mass of the moon is 1% of mass of the earth.The ratio of gravitational pull of earth on moon to&#160;that of moon on earth will be:

Question 9 :
Calculate the distance traveled by a body dropped from rest in $0.1\ s$. Take $g=10\ Nkg^{-1}$

Question 10 :
Which of the following statement is not a similarity between electrostatic and gravitational forces.?