Question Discussion & Solution

Pack is a group of Wolves.

Similarly,

Option 3 is correct, i.e. p-block.

• Modern Periodic Table:
  • The Modern Periodic Table is classified into the following elements - p-block, s-block, d-block, and f-block.
  • The p-block elements include chalcogens, pnictogens, halogens, inert gases.
    • The 18^th group is known as Inert gas, zero groups, Nonreactive gases.
    • The 17^th group is known as Halogen.
    • The 16^th group is known as Chalcogen.
    • The 15^th group known as Pnictogen.
    • Pnictogen group refers to the choking property of nitrogen gas (as opposed to air, which contains oxygen as well as nitrogen).
    • Nitrogen family elements consist of atoms having 5 electrons in their outer energy level. Two of the electrons are in the s subshell, with 3 unpaired electrons in the ​p subshell.
  • The s-block elements include alkali metals and alkaline earth metals. 
  • The d-block elements include Transition elements.
  • The f-block elements include Inner Transition Elements.

The correct answer is Fructose.

Key Points

•  Fructose
  • It is naturally occurring sugar.
  • It is the sweetest sugar.
  • It is a 'monosaccharide', meaning the simplest form of sugar, which means it cannot be broken down into more basic sugar units.
  • Other common examples of monosaccharides are glucose and galactose.
  • The chemical formula of fructose is C₆H₁₂O₆.

Additional Information

• Maltose
  • It is a very sweet sugar which is also known as maltitol sugar.
  • It is mostly found in honey.
  • Its molecular formula is C₁₂H₂₂O₁₁.
• Glucose
  • It is the most abundant monosaccharide, a carbohydrate sub-category.
  • During photosynthesis, glucose is primarily produced by plants and most algae from water and carbon dioxide, using energy from sunlight, where it is used to create the most abundant carbohydrate cellulose in cell walls.
  • The chemical formula of glucose is C₆H₁₂O₆.
• Sucrose
  • It is crystallized white sugar produced by the sugar cane plant and can be found in households and foods worldwide.
  • The formulae for sucrose is C12H22O11.
  • It is a disaccharide so when we hydrolyse it we will get one molecule of glucose and another molecule of fructose.
  • It is also known as table sugar.
  • The formulae for sucrose is C₁₂H₂₂O₁₁.

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.

The correct answer is ​Shaheed-e-Azad Bhagat Singh.

Key Points

• Shaheed-e-Azad Bhagat Singh (1954) is the first film based on Bhagat Singh’s life.
  • The movie was directed by Jagdish Gautama and had Prem Abeed, Jairaj, Smriti Biswas, and Ashita Mazumdar in lead roles.
  • The film also boasted of the classic patriotic song ‘Sarfaroshi Ki Tamanna Ab Hamaare Dil Mein Hai’ in Mohammed Rafi’s melodious voice. 
• Shaheed Bhagat Singh (1963):
  • Almost a decade later, Shammi Kapoor appeared in and as Shaheed Bhagat Singh.
  • The film was directed by KN Bansal and besides Shammi Kapoor, the movie starred Shakeela, Premnath, and Achla Sachdev in prominent roles.
• Shaheed (1965):
  • At the 13^th National Awards, the film won awards for Best Feature Film in Hindi and Nargis Dutt Award for Best Feature Film on National Integration and Best Story.
  • ‘Shaheed’ had the entire nation humming to its patriotic compositions like ‘Aye watan aye watan humko teri kasam’, ‘Sarfaroshi ki tamanna’, ‘O mera rang de basanti chola’ and ‘Pagadi sambhaal jattaa’ with the voices of Mukesh, Mohammed Rafi, Lata Mangeshkar and Manna De gracing the vocals. 
• The Legend of Bhagat Singh (2002):
  • Rajkumar Santoshi directed Ajay Devgn as Bhagat Singh and focused on how Singh came to develop his independent views against the British Raj and the development of his ideologies, right from witnessing the death of Lala Lajpat Rai to the reopening of the Saunders’ murder case.
  • The film went on to win two National Awards, including the Best Feature Film in Hindi and Best Actor for Ajay Devgn.