Question Discussion & Solution

The logic is:

Starting from 3 in the clockwise direction:

3 × 2 - 1 = 5

5 × 2 - 2 = 8 

8 × 2 - 3 = 13

13 × 2 - 4 = 22

Similarly, 

22 × 2 - 5 = 44 - 5 = 39

Hence, 39 is the correct answer. 

The correct answer is Hydrogen.

Key Points

• Hydrogen has atomic number 1 and is placed in group 1 along with alkali metals.
• It is the first element in the periodic table.

​Additional Information

• Hydrogen was discovered by Henry Cavendish.
• Hydrogen gas is called the fuel of the future.
• The most abundant element in the universe is Hydrogen.
• The most abundant element on earth's crust is Oxygen.
• Hydrogen is the 'lightest element' in the periodic table.
• Lithium is the 'lightest metal' in the periodic table.

Ammeter is an instrument used to measure Current.

Similarly, Hygrometer is an instrument used to measure Humidity

The Correct answer is Uniform motion.

Key Points

• Motion​:
  • It is a phenomenon in which an object changes its position with respect to time.
  • All motions are relative to some frame of reference. 
  • There are two types of motion:
    • Uniform Motion
    • Non-uniform Motion
• Uniform motion:
  • If an object is traveling with uniform motion, it is moving in a straight line at a constant speed.
  • For example, An object falling at terminal velocity experiences the same air resistance as its weight.
  • Newton's first law can be used to explain the movement of objects traveling with uniform motion.
  • Newton's first law is a body that is at rest or moving at a uniform rate in a straight line will remain in that state until some force is applied to it.

​Additional Information

• Retarding motion: The Motion in which the speed of the body gradually decreases.
• Non-uniform motion: If a body covers unequal distances in equal intervals of time
• Non-linear Motion: Nonlinear motion is motion along a curved path; It is the combination of two components of motion' horizontal motion (without acceleration) vertical motion (under the acceleration of gravity).

The correct answer is Ferozeshah Kotla in Delhi.

• The Hindustan Socialist 'Republican Association formed in 1928 at Ferozeshah Kotla in Delhi.

Key Points

• Hindustan Socialist Republican Association (HSRA):
  • Hindustan Republic Association at a historic meeting in the ruins of Ferozshah Kotla in Delhi was converted into Hindustan Socialist Republican Association in September 1928.
  • Under the leadership of Chandra Shekhar Azad, the name of HRA was changed to Hindustan Socialist Republican Association (HSRA).
  • The participants included Bhagat Singh, Sukhdev, Bhagwaticharan Vohra from Punjab and Bejoy Kumar Sinha, Shiv Verma and Jaidev Kapur from the United Provinces.
  • The HSRA decided to work under a collective leadership and adopted socialism as its official goal.

Additional Information

• Hindustan Republican Association/Army:

  • The HRA was founded in October 1924 in Kanpur by Ramprasad Bismil, Jogesh Chandra Chatterjee and Sachin Sanyal, with an aim to organise an armed revolution to overthrow the colonial government and establish in its place the Federal Republic of United States of India whose basic principle would be an adult franchise.