Miscellaneous

The physicist who was awarded the Nobel Prize in Physics for Quantum Theory in 1918 was Max Planck.

• He received the prize "in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta."

The 'Raman Effect' was given by Sir C.V. Raman.

• He discovered this phenomenon in 1928, which deals with the inelastic scattering of light by molecules.
• For this groundbreaking discovery, Sir C.V. Raman was awarded the Nobel Prize in Physics in 1930.

• The appearance of additional lines in the spectrum of monochromatic light has been scattered by a transparent material medium known as the Raman effect.

1. Hygrometer is an instrument used to measure the relative humidity of the atmosphere.
2. A lactometer is used to measure the relative density of milk and check its purity.
3. The velocity of air is measured by anemometer.
4. Seismograph is an instrument used to measure seismic intensity.
5. Hence option (b) is not the correct pair.

The instrument used to check the purity of milk by measuring the relative density of milk is a lactometer. 

• A lactometer is a type of hydrometer specifically designed to measure the specific gravity (relative density) of milk.
• The principle behind its operation is based on Archimedes' principle, which states that a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the body.  

• The lead-acid battery represents the oldest rechargeable battery technology.
• Lead acid batteries can be found in a wide variety of applications including small scale power storage such as UPS systems, starting lighting and ignition power sources for automobiles, along with large, grid-scale power systems.

The device used to test whether an object is carrying an electric charge or not is an electroscope.   

• An electroscope works on the principle of electrostatic repulsion.
• It typically consists of a metal rod with thin metal leaves (usually gold or aluminum) hanging from its bottom end, and a metal knob or plate at the top.

Hence option (a) is the correct answer.

• The altimeter is pressure operated instrument.
• It is similar to barometer expect that it uses units of distance(meters or feet).
• It works by measuring air pressure and also utilizing the fact the air pressure of the atmosphere decreases by approximately 1 millibar for each 10 meters in height.

• It can be used to determine relative humidity, which is the ratio of water vapor in the air to the maximum amount of water vapor the air can hold at a given temperature.