ANS:A - Only assumption I is implicit

Explanation: Clearly, the problem of traffic jams arises during monsoons not because of increased number of vehicles but due to slow movement of traffic on account of bad roads. So, only I is implicit.

ANS:D - 1, 4

No answer description is available. Let's discuss.

ANS:A - Newton in absolute units

Newton - SI unit.
Dyne - CGS unit.

ANS:C - 16 bit & 32 bit

No answer description is available.

ANS:C - impact

Maximum size reduction in a ball mill is primarily achieved through impact action.

Explanation:

• Impact Action: In a ball mill, the grinding media (balls) and the material being ground are subjected to impacts as the balls cascade and tumble within the mill cylinder. These impacts cause the particles to break or deform, leading to size reduction.
• Other Actions:
  • Attrition: Attrition occurs when the grinding media rub against each other or against the mill lining. While attrition contributes to size reduction, it is typically secondary to impact in a ball mill.
  • Compression: Compression is not a primary mechanism in a ball mill because the grinding media (balls) do not compress the material directly. Instead, particles are crushed or deformed by impacts.
  • Cutting: Cutting action is not applicable to ball mills, as they do not involve shearing or cutting of materials.
• Effective Size Reduction:
  • Impact action in a ball mill is effective for reducing the size of particles because it involves high-energy collisions between the grinding media and the material.
  • The efficiency of size reduction in a ball mill depends on factors such as the speed of rotation, the size and number of balls, and the characteristics of the material being ground.

ANS:B - high vacuum.

A Pirani gauge is used for the measurement of high vacuum.

Explanation:

• Pirani Gauge:
  • A Pirani gauge is a type of thermal conductivity gauge used to measure the pressure in a vacuum system.
  • It operates based on the principle that the thermal conductivity of gases varies with pressure. As pressure decreases (in a high vacuum), the thermal conductivity also decreases.
  • The gauge measures the heat loss from a heated filament due to the presence of gas molecules. The rate of heat loss is directly related to the gas pressure in the system.
  • Pirani gauges are typically used in the pressure range from around 10^-3 to 10^3 Torr (approximately 10^-3 to 10^3 mbar), making them suitable for measuring high vacuum conditions.
• Applications:
  • Pirani gauges are commonly used in various industries and scientific applications where precise measurement of vacuum levels is crucial. This includes semiconductor manufacturing, vacuum coating processes, analytical instruments, and research laboratories.
• Not Suitable for:
  • Pirani gauges are not designed for measuring very high pressures or pressures at atmospheric levels. For high-pressure measurements, other gauges such as mechanical pressure gauges or transducers are used.

Conclusion:

ANS:B - Nepal

Nepal's PM Pushpa Kamal Dahal inaugurated the Pokhara Regional International Airport

ANS:A - Russia

Russia claimed that Ukraine's drone production was targeted in a New Year attack.

ANS:D - Pakistan

India and Pakistan exchanged lists of civilian prisoners and fishermen in their custody.

ANS:A - China

China opened an embassy in Nicaragua after the nation broke ties with Taiwan.