Question Discussion & Solution

Concept:

​Simple Pendulum:

• A simple pendulum consists of a small metallic ball or a piece of stone suspended from a rigid stand by a thread.
  The metallic ball is called Bob.
• A pendulum swings from one extreme position to another and comes back to the same position, this completes one oscillation. 
• One oscillation can also be defined as the pendulum starting from the mean position, going to one extreme, and coming back to the same mean position. 
• The time duration to compete for one oscillation is called time period and the is reciprocal of time period is frequency. 
• Frequency: The number of oscillations per unit time is called frequency. 

\(frequncy =\frac{Oscillation}{Time}\)

Calculation:

Given that : Frequency = 2 hz and time = 16 sec.

In a sec pendulum completes 2 oscillations per second.

⇒ Oscillations = Frequency × time

⇒ Oscillations = 2×16

⇒ Oscillations = 32

Additional Information

The time period of a simple pendulum depends upon on the length of the string and acceleration due to gravity.

\(T = 2 \pi \sqrt{\frac{l}{g}}\)

l is length, g is acceleration due to gravity. 

 The correct answer is Electrically Erasable Programmable Read-Only Memory.

Key Points

• EEPROM stands for Electrically Erasable Programmable Read-Only Memory.
• It is a non-volatile memory in which the information stored Is retained even after the power goes off.
• A special type of PROM in which the information stored in it can be erased by exposing it to an electrical charge at one byte at a time. 
• EEPROM generally offers excellent capabilities and performance.
• EEPROMs are constructed as arrays of floating-gate transistors.

The correct answer is Tecomella Stenosis.

• Tecomella Stenosis is the scientific name of the state flower-Rohira of Rajasthan.

Key Points

• Rohira is the state flower of Rajasthan.
• Its scientific name is Tecomella Stenosis.
• The flower is mainly found in desert and barren areas of the Thar Desert, Rajasthan.

Additional Information

• Lilium is the scientific name of lily flower.
• Helianthus is the scientific name of sunflower.
• Psidium Guajava is the scientific name of Guava.

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.

The correct answer is ​Red and yellow soil.

Key Points

• Red and Yellow Soil:
  • Red soil develops on crystalline igneous rocks in areas of low rainfall in the eastern and southern part of the Deccan Plateau. Hence option 1 is correct.
  • Along the piedmont zone of the Western Ghat, a long stretch of area is occupied by red loamy soil.
  • Yellow and red soils are also found in parts of Odisha and Chhattisgarh and in the southern parts of the middle Ganga plain.
  • The soil develops a reddish colour due to a wide diffusion of iron in crystalline and metamorphic rocks.
  • It looks yellow when it occurs in a hydrated form.
  • The fine-grained red and yellow soils are normally fertile, whereas coarse-grained soils found in dry upland areas are of poor infertility.
  • They are generally poor in nitrogen, phosphorous and humus.