Tag: science & technology

The Maginot Line was a defensive barrier built by France along its border with Germany in the 1930s. It consisted of concrete fortifications, obstacles, and weapon installations designed to prevent a surprise German invasion.

The McMahon Line is the boundary line between China and India (Tibet), agreed upon in the 1914 Simla Convention. It represents the effective boundary between Arunachal Pradesh (India) and Tibet, though China disputes its legitimacy.

The Oder-Neisse line is the border between Germany and Poland that was established after World War II. It runs along the Oder and Neisse rivers, marking the territorial changes that resulted from the Potsdam Conference in 1945.

The Sir Creek dispute is a territorial conflict between India and Pakistan over a 96-kilometer estuary in the Arabian Sea. It's located between the Indian state of Gujarat and the Pakistani province of Sindh. The dispute has been ongoing since before independence and has seen multiple rounds of negotiations. Option C correctly identifies the two countries involved.

A lactometer is specifically designed to measure the density and purity of milk by checking its specific gravity. Barometers measure atmospheric pressure, thermometers measure temperature, and alcoholometers measure alcohol concentration in liquids.

Hare's apparatus is specifically designed to compare the densities of two immiscible liquids by measuring the heights of liquid columns in inverted U-tubes. Pascal's tube relates to pressure, Boyle's apparatus relates to gas laws, and U-tube is too generic.

A magnetometer is the correct instrument for measuring magnetic field direction and strength. Hydrometers measure liquid density, magnetic pole refers to the poles themselves, and magnetic compass only shows direction relative to Earth's magnetic field.

A barometer measures atmospheric air pressure. Sphygmomanometers measure blood pressure, hydrometers measure liquid density, and airometers (if referring to air flow) measure flow rate not pressure.

A thermometer is the instrument specifically designed to measure temperature, including human body temperature. The other options are either non-existent (temptometer) or measure completely different physical quantities.