Question 1 :
The gravitational force which acts on a body of mass 1 kg on the surface of the earth is
Question 3 :
Helium is preferred over hydrogen for filling balloons because it is 
Question 4 :
The acceleration of free fall for object moving near the surface of Earth is:
Question 5 :
The gravitational pull exerted by the earth on a body is called its:
Question 7 :
The upward force exerted by the floating body on the fluid is known as upthrust.
Question 8 :
If the mass of a body is 5 kg, what is its weight?
Question 9 :
Value of 'g' on moon is _________ of the value of 'g' on earth. Fill in the blank.
Question 10 :
The __________ of an object does not change from place to place.
Question 14 :
Buoyant force experienced by a solid is _____ the weight of the fluid displaced by it
Question 15 :
The force acting on a mass of 1 g due to the gravitational pull on the earth is called 1 g-wt. One g-wt equals :
Question 16 :
A body is heated. What is the effect on its relative density?
Question 17 :
The weight of a person on Earth is 600 N. His weight on Moon will appear as:
Question 18 :
Weight of a body is a scalar quantity. True or false.
Question 19 :
The weight of a body on the surface of the moon is $\dfrac {1}{6}th$ of that on the earth's surface. It is because acceleration due to gravity on the surface of the moon is six times that on the surface of the earth.
Question 20 :
A body will experience minimum upthrust when it is completely immersed in:
Question 21 :
A point mass of $10kg$ is placed at the centre of Earth. The weight of the point mass will be
Question 22 :
The ratio of the weight of a body to its mass gives the _______ at the given place.
Question 23 :
State whether true or false.<br/>The direction of acceleration due to gravity is always vertically downward.<br/>
Question 24 :
If the earth shrinks half in radius with its mass remaining the same, the weight of an object on earth will :<br/>
Question 25 :
Assertion: A raindrop after failing through some height attains a constant velocity.
Reason: At constant velocity, the viscous drag is just equal to its weight.
Question 26 :
For a given length of a pendulum, the time period is maximum<br>
Question 27 :
The radius of the earth is $R$ and acceleration due to gravity at its surface is '$g$'. If a body of mass '$m$' is sent to a height of $R/4$ from the earth's surface, the potential energy is:
Question 28 :
Relative density of a body wrt a medium of density $\rho_1$ is a. What is the relative density of the body wrt a medium of density $\rho_2$
Question 29 :
Assertion: Earth has an atmosphere but the moon does not.
Reason: Moon is very small in comparison to earth.
Question 30 :
How much will a person with 72 N weight on Earth,weight on the moon?
Question 31 :
Consider two solid uniform spherical objects of the same density $\rho$. One has radius $R$ and the other has radius $2R$. They are in outer space where the gravitational fields from other objects are negligible. If they are arranged with their surface touching, what is the contact force between the objects due to their traditional attraction?<br>
Question 32 :
A body weighs $160\ N$ on the earth. Find its weight on another planet whose mass is $\dfrac {5}{2}$ times mass of earth and radius $\dfrac {4}{5}$ times that of earth.
Question 33 :
A tunnel is dug along a diameter of the earth. The force on a particle of mass $m$ placed in the tunnel at a distance $x$ from the centre is:  
Question 34 :
ball of mass 1 kg falls from a height of $5m$ above the free surface of water$.$ The relative density of the solid ball is s=$\frac{2}{3}.$ The ball travels a distance of 2 m under water and becomes stationary$.$ The work done by the resistive forces of water is
Question 35 :
ACCELERATION DUE TO GRAVITY OF THE EARTH<br>Radius of earth is 6400 km and that of mars is 3200 km. Mass of mars is 0.1 that of earth's mass. Then the acceleration due to gravity on mars is nearly.
Question 36 :
Assertion: A block of wood is floating in a pond of water and its apparent weigth is zero.
Reason: The weight of water displaced (buoyant force) acting vertically upwards is just equal to the weight of the body which acts vertically downwards.
Question 37 :
A force of $\left( 7\hat { i } +6\hat { k } \right) $ newton makes a body move on a rough plane with a velocity of $\left( 3\hat { j } +4\hat { k } \right)\ m \ {s}^{-1} $. The power in watt is
Question 38 :
Assertion: If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places.
Reason: The value of acceleration due to gravity is independent of rotation of earth.
Question 39 :
A mass $M$ is split into two parts $m$ and $\left(M-m\right)$ which are then separated by a certain distance. The ratio ${m}/{M}$ which maximizes the gravitational force between the parts is
Question 40 :
A stone weight 100 N on the surface of the earth. The ratio of its weight at a height of half the radius of the earth to its weight at a depth of half the radius of the earth will be approximately
