Question Discussion & Solution

Length is measured in Meter.

Similarly,

Power is measured in Watt.

Preparing the family tree using the following symbols,

Given:

Mahendra is the son of Naman, who is the brother of Reema’s mother.

1) Mahendra is the son of Naman.

2) Naman is the brother of Reema’s mother.

We can draw following Family Tree from the information given above:

Hence, the Mahendra is the "Cousin" of Reema.

A matter is something that occupies space, has shape, mass and volume. It can be categorized in the following categories:

• Solid: Solids are those, whose molecules are bounded tightly, hence the distance between them is the least.
  • The molecules are fixed in a position.
  • It has definite shape as well as mass.
  • It has a high density.
  • In this, vibration is the least because of tightly bound molecules
• Liquid: In this particles are more loosely packed as compared to solids. It can flow.
• Gas: In this, the molecules have a great space between them. It has no definite shape and volume.
• Plasma: It is an ionized gas substance that has sufficient energy to provide free electrons from molecules.

The correct answer is 2 ms^-2

• We know that according to Newton's 2^nd law, 
  • ​Force = Mass × Acceleration
  • or \((\vec F = m \times \vec a)\)
• Here, F = 100 N and Mass = 50 Kg
• So, 100 = 50x a ⇒ a = 100/50 = 2.
• Hence, the acceleration will be 2 ms^-2.

• Force: A force is something that changes the state of rest or motion of a body.
  • It causes the body to start moving if it is at rest or stops if it is in motion or deflects from the initial path.
  • Force is a vector quantity having SI unit Newton (N) and dimension (MLT^-2).
• According to Newton’s Second law of motion
  • The rate of change of momentum of a body is directly proportional to the resulting force acting on a body
  • Mathematically it can be expressed as 
• \(\vec F \propto \frac{{d\vec p}}{{dt}}\;or\;\vec F = m \times a\)

The correct answer is Butane.

Key Points 

• Liquefied Petroleum Gas (LPG) is a blend of light hydrocarbon compounds.
  • It mainly consists of butane or propane or a mixture of both.
  • At room temperature, both gases are colourless and odourless.
  • It is a mixture of 48% propane, 50% butane, and 2% pentane.

Additional Information

• Water Gas:
  • Water-gas is a mixture of CO and H₂.
  • However, by-products such as char, tar, soot, ash, and condensates are also produced. 
• Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
• Compressed natural gas is a fuel that can be used in place of petrol (gasoline), diesel fuel, and liquefied petroleum gas (LPG).
  • CNG combustion produces fewer undesirable gases than the aforementioned fuels.
  • In comparison to other fuels, natural gas poses less of a threat in the event of a spill, because it is lighter than air and disperses quickly when released.