Question Discussion & Solution

The correct answer is Western disturbances.

Key Points

• Western Disturbances are responsible for the rainfall during winter over the northwestern part of India.
• The Western Disturbance originates in the mid-latitude region near Europe and the Atlantic Ocean.
  • The low pressure builds up over the Mediterranean Sea and moves over Iraq, Afghanistan, and Pakistan before entering India, and contains substantial amounts of moisture.
  • When these low-pressure systems reach the Indian subcontinent, they are blocked by the Himalayas and rain as snow over the northwestern plains and the higher reaches of the western Himalayas.
  • After precipitation over northwest India, they weaken and are devoid of moisture, they blow as dry winds that form dense fog over the northern plains of India.

Additional Information

• The period June to September is referred to as the Southwest Monsoon period.
  • Southwest Monsoon period is the principal rainy season for the Indian subcontinent.
  • This is the summer monsoon period where the southwest monsoon holds away over the country.
  • The whole country receives nearly 75% of its rainfall during this period.

Concept:

The different types of motion are described in the below table.

Explanation:

• When a tight string is stretched, we can see the string is moving up and down at a very fast speed.
• It may be so fast, we cannot predict the exact location of the string for a while.
• This type of phenomenon is called vibration and such motion is called vibrational motion. 
• This can also be observed while playing the guitar. 
• The guitar strings vibrate when pulled while playing it. 

The correct option is vibrational.

The code for ‘IRONIC’ would be ‘#!?@#&’.

The mirror image are given bellow

 Hence, option 2 is the correct answer.

CONCEPT:

• It is the property of liquid by virtue of which the free surface of the liquid at rest acting like a stretched membrane trying to contract to reduce its surface area.
• Surface tension is a force per unit length (or surface energy per unit area) acting in the plane of interface between the liquid and the bounding surface.
• It is the extra energy that the molecules at the interface have as compared to the interior.
• The surface tension is the force acting perpendicular on a unit length of an imaginary line drawn on the surface of the liquid and it can be expressed as

\(\Rightarrow T = \frac{F}{l}\)

• Because of this surface tension, few insects can easily float on liquid surface similarly a needle can be made to float on the surface of liquid using this principle

Here,

T = surface tension,

F = force acting on the surface (Cohesive force)

l = unit length

EXPLANATION:

• As explained above, the surface tension acting on a fluid surface can be expressed as

Surface tension, \(T = \frac{{{\rm{The\;cohesive\;force\;between\;molecule}}}}{{unit\;length}}\) 

• Also, we know that cohesive force or the attractive force between the liquid molecules is inversely proportional to its temperature.
• Since as we increase the temperature of fluid its interatomic distance will keep on increasing hence it will cause a decrease in the surface tension of the fluid.

i.e., \(surface\;tension,\;T \propto \frac{1}{{temperature}}\)

So, only option 3^rd is correct.