ANS:A - 2431

No answer description is available. 

ANS:C - Protected data members

No answer description is available. Let's discuss.

ANS:E - 2 cos .

(1) Length of long chord = 2R sinD/2.
(2) Tangent length = R tanD/2.

Ratio =(1) / (2).
Ans. =2 cosD/2.

ANS:A - True

No answer description is available.

ANS:A - mass transfer co-efficient.

The dimension of the diffusion coefficient is not the same as that of the kinematic viscosity. Here's why:

1. Diffusion Coefficient Dimension: The diffusion coefficient (D) is a measure of how rapidly particles spread or diffuse through a medium. It has dimensions of length squared per time (e.g., m^2/s in SI units). The diffusion coefficient is a property of the material and describes the ability of particles to move through the medium by diffusion.
2. Kinematic Viscosity Dimension: Kinematic viscosity (𝜈ν) is defined as the dynamic viscosity (𝜇μ) divided by the density (𝜌ρ) of the fluid. Its dimension is length squared per time (e.g., m^2/s in SI units), which is the same as that of the diffusion coefficient. However, the kinematic viscosity represents the fluid's resistance to flow, while the diffusion coefficient represents the rate of diffusion of particles within the fluid.

ANS:C - Vacuum pump

Among the options provided, the device that typically has the maximum compression ratio is the compressor.

Explanation:

1. Compression Ratio:
   • Compression ratio is defined as the ratio of the absolute discharge pressure to the absolute suction pressure in a compression process.
   • It indicates how much the compressor increases the pressure of the fluid (gas or air) passing through it.
2. Devices Listed:
   • Blower: Blowers are used to move air or gas with a moderate increase in pressure. They generally have lower compression ratios compared to compressors.
   • Compressor: Compressors are designed specifically to increase the pressure of gases or air to higher levels. They can achieve high compression ratios, especially in applications such as gas turbines, refrigeration systems, and industrial processes.
   • Vacuum Pump: Vacuum pumps are designed to evacuate or reduce the pressure below atmospheric pressure. They do not typically operate with compression ratios in the same sense as compressors.
   • Fan: Fans are used to move air or gases with relatively low pressure increases. They generally have the lowest compression ratios among the devices listed.
3. Maximum Compression Ratio:
   • Compressors, especially those used in high-pressure applications like gas compression in industrial processes or refrigeration systems, are designed to achieve significantly higher compression ratios compared to blowers, vacuum pumps, or fans.
   • The actual compression ratio can vary depending on the specific type and design of the compressor, but compressors are generally engineered to handle much higher pressure differentials than other devices listed.

Conclusion:

ANS:C - Mumbai

Tata Power will set up India's first solar plant for a housing society in Mumbai.

ANS:C - Dibrugarh

PM Modi flagged off the World's Longest River Cruise, Ganga Vilas. The cruise will conclude in Dibrugarh.

ANS:C - Varanasi

The Grand cultural event Sur Sarita-Symphony of Ganga will be held in Varanasi.

ANS:C - Delhi

According to the CPCB report, Delhi is the most polluted city in India.