Question Discussion & Solution

The correct answer is option 4) i.e. kg-1 m2

CONCEPT:

• Gravitational constant, G: G is a physical constant and therefore is universal in nature and has a constant value everywhere.
  • The value of G does not change with respect to time or place and is equivalent to 6.674 × 10-11 N m2 kg-2
  • The SI unit of G is N m2 kg-2
• Acceleration due to gravity, g: It is the acceleration of a body due to the force exerted from the earth's gravity.
  • It has a constant value of 9.8 m/s² within the surface of Earth.
  • The SI unit of g is m s^-2

EXPLANATION:

The unit of G = N m2 kg-2 = (mass × acceleration)m2 kg-2 = (kg × m/s²)m2 kg-2     (∵ N is the SI unit of force)

The unit of g = m s^-2​

Ratio, \(\frac{G}{g} = \frac{m^3 kg^{-1 }s^{-2 }}{m s^{-2}} =\) kg-1 m2

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.

According to given information:

The correct answer is 2 ms^-2

• We know that according to Newton's 2^nd law, 
  • ​Force = Mass × Acceleration
  • or \((\vec F = m \times \vec a)\)
• Here, F = 100 N and Mass = 50 Kg
• So, 100 = 50x a ⇒ a = 100/50 = 2.
• Hence, the acceleration will be 2 ms^-2.

• Force: A force is something that changes the state of rest or motion of a body.
  • It causes the body to start moving if it is at rest or stops if it is in motion or deflects from the initial path.
  • Force is a vector quantity having SI unit Newton (N) and dimension (MLT^-2).
• According to Newton’s Second law of motion
  • The rate of change of momentum of a body is directly proportional to the resulting force acting on a body
  • Mathematically it can be expressed as 
• \(\vec F \propto \frac{{d\vec p}}{{dt}}\;or\;\vec F = m \times a\)

The correct answer is Process.

• Creating user and system processes is part of the Process management function of the operating system.

​Key Points

• The process management component:
  • The process management component is a procedure for managing the many processes that are running simultaneously in the operating system.
  • Every software application program has one or more processes when they are running.
  • For example, when we use a browser like Google Chrome, there is a process running for that browser program.
    • All these processes are managed by process management. 
  • The process management uses memory allocated to them and shutting them down when needed.

Additional Information

• Operating system
  • An operating system is a large and complex system.
  • OS system components include:
    • File,
    • Process,
    • Memory,
    • I/O device management.
• File management
  • File management in an operating system includes file creation and deletion.
  • Manipulating files and directories.
• Memory management
  • ​An Operating System performs the functions for Memory Management such as:
    • It helps to keep track of primary memory.
    • Determine what parts of it are in use by whom, what part is not in use.
• I/O device management
  • ​An Operating System performs the functions for I/O device management such as:
    • It offers a buffer caching system
    • It provides general device driver code
    • It provides drivers for particular hardware devices.