Question 1 :
_______ of a body changes from place to place but its ______ remains constant.

Question 2 :
Specific gravity of the body is numericallyequal to ________of the body.

Question 3 :
Assertion: A man is sitting in a boat which is floating on a pond. If the man drinks some water from the pond, the level of water in the pond decreases. Reason: The volume of water in the pond decreases.

Question 4 :
Which on of the following would a hydrogen balloon find easiest to lift?

Question 5 :
The mass of an wooden cube of edge 10 cm is 800 g. If the mass of an equal volume of water is 1 kg, then find the relative density of a wooden cube.<br>

Question 6 :
If the radius of the earth is increased by&#160;three times,&#160;keeping the mass constant, then the weight&#160;of a body on the earth surface will be ______ as&#160;compared to its previous value.<br/>

Question 7 :
If $M$ is the mass of the earth and $R$ its radius, the ratio of the gravitational acceleration and the gravitational constant is:<br/>

Question 8 :
The mass of a planet is 4 times while its radius is 8 times that of the earth. If the weight of an object is 640 N on earth, what will be its weight on the planet?<br>

Question 9 :
A rectangular iron block is kept over a table with different faces touching the table. In different cases, the block exerts :

Question 10 :
The value of g at a particular point is 9.8 $ms^{-2}$. Suppose the earth suddently shrinks uniformly to half its present size without losing any mass. The value of g at the same point (distance of the point from the centre of earth does not change) will now be<br>

Question 11 :
Two balls are dropped from the same height from places $A$ and $B$. The body at $B$ takes two seconds less to reach the ground at $B$ strikes the ground with a velocity greater than at $A$ by $10 m/s$. The product of the acceleration due to gravity at the two places $A$ and $B$ is:

Question 13 :
The maximum vertical distance through which a fully dressed astronaut can jump on the earth is&#160;0.5 m. If mean density of the moon is two thirds&#160;that of the earth and radius is one quarter that of the earth, the maximum vertical distance through&#160;which he can jump on the moon and the ratio of&#160;time of duration of the jump on the moon to that&#160;on the earth are.

Question 14 :
A spherical planet, far out in space, has a mass $M_0$ and diameter $D_0$. A particle of mass $m$ falling freely near the surface of this planet will experience acceleration due to gravity which is equal to:

Question 15 :
A ball with a weight of 20 N is thrown vertically upward . What is the acceleration of the ball just as it reaches the top of its path ?