Question Discussion & Solution

Option 1 - Arrow - Arrow is used in Archery. An arrow is a projectile with a pointed tip and a long shaft with stabilizer fins (fletching) towards the back, with a narrow notch (nock) at the very end to contact the bowstring.

Option 2 - Duck - In cricket a duck is a batsman's dismissal with a score of zero.

Option 3 - Stump - In cricket, the stumps are the three vertical posts that support the bails and form the wicket.

Option 4 - Pitch - In the game of cricket, the cricket pitch consists of the central strip of the cricket field between the wickets.

All except Arrow is associated with cricket.

Concept:

• Water Harvesting: Water harvesting is a practice to conserve water by collecting rainwater in an organized way.
  • The rainwater is not allowed to flow and get wasted but collected in tanks.
  • The main purpose however is not the collection but the enhancement of groundwater level.  
  • The collected water through tubes is made to recharge groundwater.
  • Maintenance of groundwater is long term sustainable structure for water conservation.

Here the logic is the methods which consumes water:

Explanation:

Kneading:

• Kneading is a process in the making of dough by mixing water and flour.
• Example: Kneading dough for roti. 
• Consumes water

Swimming also need water to do so.

Washing clothes is also a process that consumes.

While combing hair, no need of water.

The correct answer is Bundi, Udaipur, Pratapgarh and Banswara

• The correct location of the districts from north to south direction in Rajasthan is Banswara, Pratapgarh, Udaipur and Bundi.

Key Points

Additional Information

• Banswara:
  • Banswara is known as the Cherrapunji of Rajasthan.
  • It is also known as ‘City of Hundred Islands.
  • The state of Banswara was established by Jagmal Singh.
  • It shares a border with Pratapgarh, Dungarpur districts, Madhya Pradesh and Gujarat.
• Pratapgarh:
  • Maharana Kumbha was the ruler of Mewar with capital at Chittorgarh.
  • The district is surrounded by Udaipur, Banswara, Chittorgarh, Ratlam, Mandsaur and Neemuch districts of Madhya Pradesh.
• Udaipur:
  • It is sometimes referred ‘Venice of the East.
  • It is bordered by Rajsamand, Chittorgarh & Pratapgarh, Banswara, Dungarpur, Sirohi and Pali.
• Bundi:
  • The district derived its name from a former Meena tribe chief called Bunda Meena. 
  • The district is bordered by Tonk, Sawai-Madhopur, Kota, Chittorgarh, and Bhilwara.

The correct answer is Vitamin A.

Key Points 

• Night blindness is the inability to see well at night or in poor lighting conditions. 
• Night blindness is also called nyctalopia.
• Night blindness is often caused by Vitamin A deficiency.
• Night blindness is also caused by nearsightedness or cataracts.
• Foods that provide Vitamin A are carrots, sweet potatoes, eggs, milk, milk products, etc. 

Additional Information 

The correct answer is Curvature of the lens.

Important Points

• Focal length of a lens depends on its curvature and the medium outside the lens.

Additional Information

• The ability of a lens to converge or diverge light rays depends on its focal length.
  • For example, a convex lens of short focal length bends the light rays through large angles, by focussing them closer to the optical centre.
  • Similarly, the concave lens of a very short focal length causes a higher divergence than the one with a longer focal length.
• The degree of convergence or divergence of light rays achieved by a lens is expressed in terms of its power.
  • The power of a lens is defined as the reciprocal of its focal length.