ANS:A - intentional

No answer description is available. 

ANS:A - Yes

Because typedef goes to work after preprocessing.

ANS:D - All of these.

Fat Lime or Rich Lime or White Lime or Very Pure Lime contains 95% Cao and Quick Lime or Pure Lime or Caustic Lime Obtained After Cancination of Limestone. Fat lime, white lime and rich lime are same thing. They are used for white washing. So all of these option is right. Fat lime, Rich lime and White lime are same.
Fat lime contains high(rich) amount 95% Calcium Oxide, thus also called Rich lime.
Fat lime is white in colour and mostly used for whitewashing, thus called Whitewashing.
All are correct.

ANS:B - 50 Hz ac only

Induction principle is valid for ac only. Induction Instruments are calibrated for 50 Hz ac.

ANS:B - thermal diffusion

Separation of the isotopes of helium for scientific investigations is typically done by thermal diffusion. Thermal diffusion is a process that relies on the different rates of diffusion of isotopes or molecules in a mixture due to their differing masses. In the case of helium isotopes, helium-3 (^3He) and helium-4 (^4He) have different masses, which results in different rates of diffusion when subjected to a temperature gradient. By carefully controlling the temperature gradient in a thermal diffusion column, the lighter isotope (^3He) tends to migrate towards the warmer side of the column, while the heavier isotope (^4He) migrates towards the cooler side. This differential diffusion allows for the separation of the helium isotopes, with the lighter isotope (^3He) being enriched on one side of the column and the heavier isotope (^4He) being enriched on the other side. This separation process can be repeated multiple times to achieve higher levels of isotopic purity. While reverse osmosis, leaching, and solvent extraction are important separation processes used in various applications, they are not typically used for the separation of helium isotopes for scientific investigations.

ANS:A - temperature

The speed of sound in an ideal gas varies with the temperature.

Explanation:

1. Speed of Sound in Ideal Gas:
   • The speed of sound (ccc) in an ideal gas depends on the properties of the gas, particularly its temperature and the molecular composition.
   • In an ideal gas, the speed of sound is given by: c=γPρc = \sqrt{\gamma \frac{P}{\rho}}c=γρP​​ where:
     • γ\gammaγ is the adiabatic index or specific heat ratio (ratio of specific heats cp/cvc_p / c_vcp​/cv​),
     • PPP is the pressure of the gas,
     • ρ\rhoρ is the density of the gas.
2. Temperature Dependency:
   • The speed of sound in an ideal gas is directly proportional to the square root of the temperature (TTT) of the gas: c∝Tc \propto \sqrt{T}c∝T​
   • As the temperature increases, the speed of sound increases because the kinetic energy of the gas molecules increases, leading to faster propagation of sound waves through the medium.
3. Pressure and Density:
   • While pressure and density affect the speed of sound indirectly through their influence on temperature (via the ideal gas law), they do not directly determine the speed of sound independently of temperature.

Conclusion:

ANS:C - Egypt

Scientists have discovered a hidden passage inside the Great Pyramid of Giza in Egypt.

ANS:D - Manipur

Gaan-Ngai festival is celebrated by the Zeliangrong community in Manipur.

ANS:C - Odisha

The Archaeological Survey of India discovered a 1300-year-old Buddhist Stupa in Odisha.

ANS:C - Goa

Mopa International Airport, Goa renamed as 'Manohar International Airport'.