Question Discussion & Solution

The correct answer is 4°C.

• Freezing of Water:
  • As water freezes, cold water (or ice formed) comes on the surface and warm water goes down.
  • Since the freezing temperature of the water is 0ºC or 273 K.
  • So water at the bottom should be at a higher temperature.
  • Water density at 4ºC is more than the density of water at 0ºC, hence the correct option is 4ºC.

​Key Points

• Reason of low temperature at bottom of the top layer:
  • This is due to the process of convection.
  • When the temperature of the water at the top layer reaches the freezing point, it is converted to ice.
  • But ice is lighter than water, so it will not sink to the bottom.
  • So there will be ice on the top surface and water would remain at the bottom of the lake. 

The correct answer is Femur.

Key Points

• The largest bone in the human body is the femur, the thighbone.
• It is the largest, longest, and strongest bone in the human body.
• The femur runs from the keen to the hip.
• The Femur or thigh bone is the largest and heaviest bone in the human body.
• At the proximal end of the Femur, there is a rounded prominence which is called the Head of the Femur.
• The femur runs from the keen to the hip.
• It carries all the upper body weight.
• The other parts of the leg are the tibia, femur, fibula, and keep cap also known as patella.

Additional Information

• The human skeleton is made up of 206 bones, including bones of the
  • Skull:  including the jaw bone (mandible, maxilla)
  • Spine: cervical, thoracic and lumbar vertebrae, sacrum and tailbone (coccyx)
  • Chest: ribs and breastbone (sternum)
  • Arms: the shoulder blade (scapula), collar bone (clavicle), radius, humerus and ulna
  • Hands: wrist bones (carpals), metacarpals and phalanges
  • Pelvis: hip bones
  • Legs: the thigh bone (femur), the kneecap (patella), shin bone (tibia) and fibula
  • Feet: tarsals, metatarsals, and phalanges.

The correct answer is In 2008.

• In 2008 Pratapgarh was declared the 33rd district of Rajasthan.

Key Points

• Pratapgarh district  
  • Pratapgarh district is the 33rd district of Rajasthan, created on 26 January 2008.
  • It is a part of the Udaipur Division.
  • It has been carved out from the erstwhile tehsils of Chittorgarh, Udaipur, and Banswara districts.

​Additional Information

• Geography of Pratapgarh district
  • ​It is situated at the junction of the Aravali mountain ranges and the Malwa Plateau.
  • The soil is mainly highly fertile Black Cotton Soil made of magma of volcanos.
  • The major rivers of the district are Jakham, Mahi, and Siwana or shiv.
  • Other seasonal rivers are Som, Era, and Karmoi. 

The correct answer is Shift + Space.

• Short-cut key to Select entire row in M.S. Excel Worksheet is Shift + Space.

Key Points

• This table lists the most frequently used shortcuts in Excel.

The correct answer is www.gmail.com.

• www.gmail.com is not a search engine.

Key Points

• Search engine
  • A search engine is a program that searches for Web documents.
  • Yahoo!, Google, Bing and AltaVista are some examples of search engines.

​Additional Information

• Gmail ​
  • Gmail is a free email service provided by Google.
  • As of 2019, it had 1.5 billion active users worldwide.
  • A user typically accesses Gmail in a web browser.