Question 2 :
If the relative density of solid is 1.2, then 12 g of that substance occupies 10 m$^3$<br>
Question 3 :
If a spring balance holding a heavy object is released, it will read:
Question 4 :
If the density of a metal is 8.2 g/cc, its relative density is.
Question 7 :
Assertion: Pressure inside water-drop is more than that outside drop.
Reason: Water molecules at the surface layer experience net inward force and hence all the water molecules on surface exert force on just inner layer molecules giving rise to a kind of volumetric compression
Question 8 :
Name the force acting on a plastic bucket containingwater held above ground level in your hand. <br>
Question 9 :
Write the approximate weight of a body of mass $5 kg$ ?<br>
Question 10 :
How much would a 60 kg boy weigh on the moon?<br/>Given: $g_{moon}=\dfrac {g_{earth}}{6}$<br/>
Question 12 :
State whether the weight of an iron sinker with cork combined in water will be more or less than that of the iron sinker alone in water. 
Question 14 :
If $\displaystyle g=10{ ms }^{ -2 }$ what is the force of gravity acting on a mass of 1 kg?
Question 15 :
Assertion: Heavier bodies fall with greater acceleration.
Reason: Gravitational force is stronger on heavier bodies.
Question 16 :
The __________ of an object does not change from place to place.
Question 18 :
If W be the weight of the body and U be the upthrust force oft he liquid on the body then what happens if W=U<br>
Question 19 :
A body floats in a liquid if the buoyant force is :
Question 20 :
A stone is attached at the end of a spring balance. The pointer shows 5 kg wt. Now the spring balance is released such that it is free to fall under the effect of gravity, the pointer will now give a reading equivalent to
Question 23 :
How is the acceleration due to gravity on earth surface related to the mass $M$ and radius $R$ of earth?
Question 24 :
A body weighs $12 N$ on the surface of the moon. What is its weight on the surface of the earth?
Question 25 :
Assertion: Density of a substance is the ratio of mass of the substance to its volume
Reason: Relative density is the ratio of density of substance to the density of water at 4$^{\circ}$C
Question 26 :
If a rock is brought from the surface of the moon<br>
Question 27 :
The acceleration of free fall for object moving near the surface of Earth is:
Question 28 :
Any solid will float in water if its relative density is :
Question 31 :
If a rock is brought from the surface of the moon, then :<br/>
Question 32 :
State whether given statement is True or False<br/>Because the buoyant force acts in a direction opposite the force of gravity, the net force acting on an object submerged in a fluid, such as water, is smaller than the object's weight.<br/>
Question 33 :
An object placed on a equal-arm balance requires 12 kg to balance it. When placed on a spring scale, the scale reads 12 kg. Everything (balance, scale, set of weights and object) is now transported to the Moon where the free-fall acceleration is one-sixth that on Earth. The new readings of the balance and spring scale (respectively) are :<br>
Question 34 :
A body of mass $5\ kg$ is taken into space. Its mass:<br/>
Question 35 :
Which of the following statements about weight is/are false ?<br>$1$. Weight does not change when location changes.<br>$2$. Weight is a force.<br>$3$. Weight is measured in kilograms.<br>$4$. Weight is proportional to the amount of gravity acting on an object.
Question 37 :
A block of wood floats in water with $\displaystyle \frac { 2 }{ 3 } $ of its volume submerged. Its relative density is equal to :
Question 39 :
Specific gravity of the body is numericallyequal to ________of the body.
Question 40 :
Any solid will not sink in water if its relative density is
Question 41 :
When a solid block is fully immersed in water, the volume of the water displaced is:
Question 42 :
When a solid floats in a liquid, the density of solid is _______ than that of liquid.
Question 43 :
A block of wood floats in water with two-thirds of its volume submerged. Its relative density is equal to
Question 46 :
If $S_{1}$ is the specific gravity of a solid with respect to a liquid and $S_{2}$ is the specific gravity of the liquid with respect to water, then the specific gravity of the solid with respect to water is :
Question 47 :
What will be the weight of a body of mass $m$ kg at the centre of the earth?
Question 48 :
The force of gravity with which a body is attracted towards the center of the earth is _________. <br/>
Question 50 :
Assertion: To float; a body must displace liquidwhose weight is equal to the actual weight.<br>Reason: The body will experience no net downwardforce in that case.
Question 51 :
If the density of earth increases by 20% and radius decreases by 20% then the new value of ''g'' on the surface of earth will be:
Question 52 :
The radius of the moon is 1/4th the radius is $1.738 \times 10^8$ m. Calculate the mass of the earth. Calculate the value of g on the surface of the moon:
Question 53 :
write true or false for each statement<br>A body experiences the same buoyant force when it floats or sinks in water.
Question 54 :
An ice cube is suspended in vacuum in a gravity free hall. As the ice melts it
Question 55 :
Two planets of radii $R_{1}$ and $R_{2}$ have masses $M_{1}$ and $M_{2}$ such that $\dfrac {M_{1}}{M_{2}} = \dfrac {1}{9}$. The weight of an object on these planets is $w_{1}$ and $w_{2}$ such that $\dfrac {w_{1}}{w_{2}} = \dfrac {4}{9}$. The ratio $R_{1}/R_{2}$.
Question 56 :
A piece of copper having an internal cavity weighs $264\ g$ in air and $221\ g$ in water, Find the volume of the cavity. (Take density of copper is $8.8\ g/cc$)
Question 58 :
There is a planet name 'ALLEN' which has radius three times that of the earth and density two times that of the earth. The acceleration due to gravity on 'ALLEN' will be
Question 59 :
Two thin circular discs of radii $3 cm$ and $4 cm$ respectively are placed seperatly at the bottom of a vessel containing water. The ratio of thrusts,acting on them will be:<br/>
Question 60 :
If density of the earth is doubled keeping its radius constant, then acceleration due to gravity (present value $9.8  m/s^2$) will be:
Question 61 :
The average density of the earth in terms of $g, G $and $R$ is:<br/>
Question 63 :
A planet has mass and radius  both half of earth. Acceleration due to gravity (g) at its surface should be <br/>                      
Question 64 :
Two projectiles, one fired from the surface of the earth with speed $5\ { m }/{ s }$ and the other fired from the surface of a planet with initial speed $3\ m/s$,trace identical trajectories. Neglecting friction effect the value of acceleration due to gravity on the planet is:
Question 65 :
The mass and radius of moon are $7.4 \times {10^{22}}kg$and $17.4 \times {10^{6}}kg$. Find the acceleration due to gravity at the moon .$(G = 6.67 \times {10^{ - 11}}N{m^2}k{g^{ - 2}})$
Question 66 :
Consider earth to be a homogeneous sphere , Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The acceleration due to gravity as measured by : 
Question 67 :
A rectangular box is kept over a table with different faces touching the table. In different cases, the block exerts<br>
Question 68 :
The mass of earth is $80$ times that of moon and its diameter is double that of moon. If the value of acceleration due to gravity on earth is $9.8 m/s^{2}$, then the value of acceleration due to gravity on moon will be
Question 69 :
Find the weight of a box on earth having a mass of 20 kg.
Question 70 :
A body has a mass M kg on the earth. What will be its weight on the earth?
Question 71 :
A hypothetical planet has density $\rho$, radius R, and surface gravitational acceleration $g$. If the radius of the planet were doubled, but the planetary density stayed the same, find the acceleration due to gravity at the planet's surface.
Question 72 :
The acceleration due to gravity on the surfcae of a planet is one-fourth of the value on Earth. When a brass ball is brought to this planet, its:
Question 73 :
The specific gravity of a solid with respect to a liquid is $\dfrac {4}{5}$ and specific gravity of a liquid with a respect to water is $\dfrac {10}{9}$, then specific gravity of solid with respect to water is:
Question 74 :
A ball weighing $4$ kg of density $4000$ kg $m^{-3}$ is completely immersed in water of density $1000$ kg $m^{-3}$. Find the force of buoyancy on it. $($ Given g$=10 \ m$ $s^{-2})$<br/>
Question 75 :
What is the acceleration of a body when it is projected vertically upwards?<br>
Question 76 :
100 kg of both iron and cotton are weighed by using a spring balance on the surface of the earth. If $R_{1}  and \ \  R_{2}$ are the readings shown by the balance,then:
Question 77 :
Select the wrong statement:The weight of the floating body is equal to the
Question 78 :
the density of cooking oil is $0.6g/c{m^3}$ What is the mass of $18c{m^3}$ of the cooking oil?
Question 79 :
The acceleration due to gravity at the poles and the equator is $g_{p}$ and $g_{e}$ respectively. If the earth is a sphere of radius $R_{E}$ and rotating about its axis with angular speed $\omega$, then $g_{p}-g_{e}$ is then given by
Question 80 :
The acceleration due to gravity $g$ and density of the earth $p$ are related by which of the following relations? (Here $G$ is the gravitational constant and $R$ is the radius of the earth).
Question 81 :
A block of steel of size$5 cm\times 5 cm \times 5 cm$ is weighed in water. If the relative density of steel is 7. its apparent weight is
Question 83 :
Planets A and B have same average density. Radius of A is twice that of B The ratio of acceleration due to gravity on the surface of A and B is
Question 84 :
Assertion: Earth has an atmosphere but the moon does not.
Reason: Moon is very small in comparison to earth.
Question 85 :
A mass $M$ is lowered with the help of a string by a distance $x$ at a constant acceleration $g/2$. The work done by the string will be
Question 86 :
The mass of the earth is 81 times that of the moon and the radius of the earth is 3.5 times that of the moon. The ratio of the acceleration due to gravity at the surface of the moon to that at the surface of the earth is
Question 87 :
The volume of a $500\  g$ sealed packet is $350\ cm^{-3}$. Will the packet float or sink in water if the density of water is $1\ g$ $cm^{-3}$? What will be the mass of the water displaced by this packet?<br/>
Question 88 :
At the surface of a certain planet, acceleration due to gravity is one quarter of that on earth. A brass ball is transported to this planet, then find the percentage change in its weight.
Question 89 :
A body floats with $\dfrac {1}{3}$ of its volume outside water and $\dfrac {3}{4}$ of its volume outside another liquid. The density of the liquid is:
Question 90 :
Given that T stands for time period and l stands for the length of simple pendulum. If g is the acceleration due to gravity, then which of the following statements about the relation $T^2 = (l/g)$ is correct?
Question 91 :
A body of mass $m$ is taken to the bottom of a deep mine. Then
Question 92 :
If the acceleration due to gravity, $g$, is $10m/s^2$ at the surface of the earth (radius $6400km$), then at a height of $1600km$ the value of $g$ will be? (in $m/s^2$)
Question 93 :
A stone drop from height 'h' reaches to earth surfacein 1 sec. If the same stone taken to moon and dropfreely then it will reaches from the surface of themoon in the time:
Question 95 :
At what height $'h'$ from the earth surface, acceleration due to gravity becomes half as that of acceleration due to gravity on the surface of earth.<br>[$R$ = Radius of earth]
Question 96 :
A man first swims in sea water and then in river water. Compare the weights of sea water and river water displaced by him.
Question 97 :
State whether given statement is True or False<br/>For a floating object, the buoyant force equals the object's weight.<br/>
Question 98 :
The condition for a uniform spherical mass $m$ of radius r to be a black hole is $:[G=$ gravitational constant and $g=$ acceleration due to gravity].<br>
Question 99 :
A gun is aimed at a target in a line of its barrel. The target is released and allowed to fall under gravity at the same instant the gun is fired. The bullet will
Question 100 :
If the density of a metal is $8.2 {g}/{cc}$, its relative density is
Question 102 :
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
Question 103 :
A box weights $196 N$ on a spring balance at the north pole. Its weight recorded on the same balance if it is shifted to the equator is close to (Take $g = 10 ms^{-2}$ at the north pole and the radius of the earth $= 6400 km$):
Question 104 :
Find the value of $\theta $ such that the acceleration of $A$ is $ g/6 $ downward along the incline plane. (All surfaces are smooth)
Question 105 :
A particle is dropped under gravity from rest from a height $h (g = 9.8 \,m/s^2)$ and it travels a distance $\dfrac{9h}{25}$ in the last second the height '$h$' is:
Question 106 :
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 107 :
The angular velocity of the earth's rotation about its axis is $\omega$. An object weighed by a spring balance gives the same reading at the equator as at height $h$ above the poles, the value of $h$ will be:
Question 108 :
Assume that the Earth goes round the sun in a circular orbit with a constant speed of $30 km/s$<br/>
Question 109 :
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 110 :
Two boxes of negligible mass are placed $2$ metres apart on the surface of planet $X$, initially $15$ identical steel ball bearings are placed in each box. Which statement is most accurate if $10$ of the ball bearings are transferred from box $1$ to box $2$?<br>
Question 111 :
A boy carries a fish in one hand and a bucket (not full) of water in the other hand. If he places thefish in the bucket, the weight now carried by him (assume that water does not spill):
Question 112 :
A $60kg$ man is inside a lift which is moving up with an acceleration of $2.45\ {ms}^{-2}$. The apparent percentage change in his weight is:
Question 113 :
If the mass of a planet is $10\%$ less than that of the earth and the radius is $20\%$ greater than that of the earth, the acceleration due to gravity on the planet will be.
Question 114 :
Two spherical bodies of masses $m$ and $5\ M$ and radii $R$ and $2R$, respectively, are released in free space with initial separation between their centres equal to $12\ R$. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is<br>
Question 115 :
An extremely small and dense neutron star of mass $M$ and radius $R$ is rotating at an angular frequency $\omega$. If an object is placed at its equator, it will remain stuck to it due to gravity if
Question 117 :
Two bodies with masses $M_1$ and $M_2$ are initially at the rest and a distance $R$ apart. Then they move directly towards one another under the influence of their mutual gravitational attraction. What is the ratio of the distances traveled by $M_1$ to the distance traveled by $M_2$?
Question 118 :
Two metallic spheres, each of mass M, aresuspended by two strings each of length L. Thedistance between the lower ends of the strings isL. The angle which the strings make with thevertical due to mutual attraction of the spheres is<br>
Question 119 :
A man of mass m starts falling towards a planet of mass M and radius R. As he reaches near to the surface, height realizes that he will pass through a small hole in the planet. As he enters the hole, he seen that the planet is realize made of two pieces a spherical shell of negligible thickness of mass $\displaystyle\frac{2M}{3}$ and a point mass $\displaystyle\frac{M}{3}$ at the centre. Change in the force of gravity experienced by the man is?
Question 121 :
If R is the radius of a planet, g is the acceleration due to gravity then find the mean density of the planet
Question 122 :
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 ?
Question 123 :
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 124 :
The moon's radius is $1/4$ times that of the earth and its mass $1/80$ times that of the earth. If g represents the acceleration due to gravity on the surface of the earth, then on the surface of the moon its value is :<br/>
Question 125 :
A mass of $M$ at rest is broken into two pieces having masses $m$ and $(M-m)$. The two masses are then separated by a distance. The gravitational force between them will be the maximum when the ratio of the masses [$m:(M-m)$] of the two parts is:
Question 126 :
A planet has a miss of eight times the mass of earth and density is also equal to eight times the average density of the earth. If g be the acceleration due to earth's gravity on its surface, then acceleration due to gravity on planet's surface will be :
Question 127 :
Two spherical bodies, having a mass of$M$ and $5 M$ and radius of$R$ and $2R$ respectively, arereleased in free space with initial separationbetween their centres equal to $12R$. If theyattract each other due to gravitational forceonly, then the distance covered by thesmaller body just before collision is<br>
Question 128 :
The maximum vertical distance through which a fully dressed astronaut can jump on the earth is 0.5 m. If mean density of the moon is two thirds that of the earth and radius is one quarter that of the earth, the maximum vertical distance through which he can jump on the moon and the ratio of time of duration of the jump on the moon to that on the earth are.
Question 129 :
At a place, value of acceleration due to gravity $g$ is reduced by $2$% of its value on the surface of the earth (Radius of earth = $6400 \ km$). The place is:-
Question 130 :
Explorer $38$, a radio-astronomy satellite of mass $200$kg, circle the Earth in an orbit of average radius $\displaystyle \frac {3R}{2}$ where $R$ is the radius of the Earth. Assuming the gravitational pull on a mass of $1$kg at the earth's surface to be $10 N$, calculate the pull on the satellite
Question 131 :
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 132 :
When the radius of earth is reduced by 1% with out changing the mass, then the acceleration due to gravity will<br><br>
Question 133 :
Two astronauts have deserted their spaceship in a region of space far from the gravitational attraction of any other body. Each has a mass of $100kg$ and they are $100m$ apart. They are initially at rest relative to one another. how long will it be before the gravitational attraction brings them $1cm$ closer together?<br>
Question 134 :
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 135 :
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 136 :
Two bodies, each of mass M, are kept fixed with a separation $2$L. A particle of mass m is projected from the midpoint of the line joining their centres, perpendicular to the line. The gravitational constant is G. The correct statement(s) is (are).
Question 138 :
A research satellite of mass 200 kg circles the earth in an orbit of average radius $\displaystyle \dfrac{3\mathrm{R}}{2},$ where R is the radius of  the earth. Assuming the gravitational pull on a mass 1 kg on earth's surface to be 10 N, the pull on this satellite will be:<br/>
Question 139 :
The relative density of a material is found by weighing the body first in air and then in water. If the weight in air is $(10.0 \pm 0.1)$ gf and the weight in water is $(5.0 \pm 0.1)$gf, then the maximum permissible percentage error in relative density is
Question 140 :
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 141 :
If the distance between the Sun and Earth is increased by three times then attraction between two will:
Question 142 :
Two spherical bodies of mass $M$ and $5M$ and radii $R$ and $2R$ respectively are released in free space with initial separation between their centres equal to $12 R$. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is
Question 143 :
The density and acceleration due to gravity of the moon $3/5^{th} $ and $ 1/6 ^{th} $ those of the earth respectively. If the radius of the earth is $ 5.4 \times 10^6 m $ , how much is it for the moon :
Question 144 :
A body of weight $1N$ is placed at the surface of the earth, which is assumed to be a perfect sphere of radius $6400 km $ . It is taken to a height of $600 km $ , the weight of the body, in $N$ , would be :
Question 145 :
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 146 :
The gravitational force between two bodies is decreased by $36$% when the distance between them is increased by $3m$. The initial distance between them is:
Question 147 :
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 148 :
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 149 :
If the diameter of earth becomes two times its present value and its mass remains unchanged then how would the weight of an object on the surface of the earth be affected?
Question 150 :
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
