Statement 1 is true but statement 2 is false. Specific gravity is the ratio of the density (mass of a unit volume) of a substance to the density (mass of the same unit volume) of a reference substance. Mercury has a specific gravity of 13.56 whereas specific gravity of iron is 7.21.Thus, iron ball floats on mercury.

The volume of 2 cm part of the cube, assuming the side of cube is x.
Volume = 2 * x * x = 2x²
Mass displaced by this portion = 0.2 kg = 200 gm Using
Mass = Volume * density
200 = 2x² * 1
x² = 100
x = 10 cm

In case of object moving along a circular path two types of forces centripetal and centrifugal acts upon it. As they have opposite impact thus, the object remains in balance. When centrifugal force gets disturbed then the object will leave the balance and skid toward an outward direction.

The surface of tanker will move in forward direction with increasing velocity (as acceleration in uniform), so depth will be larger at the rear end.

The value of g on earth’s surface is given by
g = (GM/R²)
⇒ (Δg/g) = – 2(ΔR/R) (if M is constant)
Thus, if radius of the earth shrinks by 1%, the value of g will increase by 2%.

A body moving with a uniform angular velocity ω on a circular path of radius r has radial acceleration equal ω²r directed towards the centre of the path.

In this case, balloon is filled up with water and then put into water. Initially, after some oscillations it become stable because the downward directing force exerted by weight of water in balloon is balanced by the upward directing buoyancy force of water. Hence, the resultant weight in water is zero as there is no resultant force acting upon it.

Density of gold is 19.30 g/cm³. The density of ultra pure liquid mercury is 13.534 g/cm³ and the density of steel is 7.80 g/cm³.

Earth’s mean orbital speed is 30 km/s.

Viscocity of Kerosene is least among all, so it will emptied first.

1. it would be difficult to use a kerosene lamp
2. the blotting paper would fail to function
3. the big trees that we see around would not have grown on the Earth

Ball bearings are used to reduce friction and friction is directly proportional to effective surface area. So if effective surface area is reduced then friction will also reduce.

Because of density. The density of the clouds is less than that of the air.

Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. In this case A expands more than B. Therefore, expansion of volume will be more for A in comparison to B on application of same amount of heat. Therefore, on heating it will appear like figure (b).

In physics, cryogenics is the study of the production of very low temperature (below –150 °C, – 238 °F or 123 K) and the behavior of materials at those temperatures. Application of cryogenics are in MRI.
MRI is a method of imaging objects that uses a strong magnetic field to detect the relaxation of protons that have been perturbed by a radio-frequency pulse. This magnetic field is generated by electromagnets, and high field strengths can be achieved by using superconducting magnets. Traditionally, liquid helium is used to cool the coils because it has a boiling point of around 4 K at ambient pressure.
Cryogenic liquids are also used in the space program. For example, cryogens are used to propel rockets into space. A tank of liquid hydrogen provides the fuel to be burned and a second tank of liquid oxygen is provided for combustion.
Cryogenic processes are also used to supply “banks” storing eye corneas, blood, and sperm for future surgical procedures. In 1961 American surgeon Irving S. Cooper introduced a freezing technique called cryosurgery. Cryosurgery is relatively bloodless because the low temperatures used constrict the blood vessels, stemming the loss of blood.

Both statement 1 and statement 2 are correct. On heating up to same temperature copper piece is found hotter than in comparison to glass piece because copper being a metal is a good conductor of heat and electricity while glass on the other hand is a poor conductor of heat. The density of copper is 8.92 gm/cm³ and of glass is 2.6 gm/cm³.

The boiling point of an element or a substance is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. As altitude increases, atmospheric pressure decreases, so boiling point decreases, so the liquid would boil at a lower temperature.