Physics

As sound is produced due to vibrations in the medium particle, that is, it needs some medium for propagation and moon does not have any atmosphere. So ultimately, no medium for propagation of waves or vibrations of a medium particle.

Hydraulic lift works on the principle of Pascal’s law.

Heat capacity (usually denoted by a capital C, often with subscripts), or thermal capacity, is the measurable physical quantity that characterizes the amount of heat required to change a substance’s temperature by a given amount. In the International System of Units (SI), heat capacity is expressed in units of joule(s) (J) per Kelvin (K). Among iron piece, water, gold piece and benzene; water has the maximum heat capacity i.e. 4.1813 j/k.

Some of the examples of aerosols are fog, dust, smoke, geyser steam etc. They can be natural or anthropogenic. Mud is not an aerosol.

The centre of gravity of a collection of masses is the point where all the weight of the object can be considered to be concentrated. The entire weight acts through the center of gravity instead of acting through the individual masses. In a uniform gravitational field (like the field close to the surface of the Earth) the Centres of Gravity and Mass are in exactly the same place.

Out of the following neutrons is not emitted by radioactive substance.

Kirchhoff’s Voltage Law (KVL) is Kirchhoff’s second law that deals with the conservation of energy around a closed circuit path.

In physics, there are seven fundamental physical quantities that are measured in base or physical fundamental units: length, mass, time, electric current, temperature, amount of substance and luminous intensity.

It is easier to roll a stone up a sloping road than to lift it vertical upwards because work done in rolling a stone is less than in lifting it.