SSC GD Constable GK Questions 2026

A lactometer floats in milk and shows its relative density. Pure milk is denser than water, so adding water lowers the density and the instrument sinks deeper, which reveals the adulteration.

The horsepower is an older practical unit of power that survives in the rating of engines, pumps and motors, and it equals about 746 watts.

The mole is the chemist's counting unit: one mole of any substance contains the Avogadro number of particles, about six followed by twenty-three zeros, whether those particles are atoms, molecules or ions.

A barometer measures the pressure of the atmosphere, traditionally by balancing it against a column of mercury. It is also used for forecasting weather, because a sudden drop in pressure signals an approaching storm, and for finding altitude, since pressure falls as one rises.

Work is force multiplied by displacement. Force has the dimensions M L T⁻², and multiplying it by a length adds one more power of L, which gives M L² T⁻².

Pressure is force divided by area, so its unit is one newton per square metre, which is given the name pascal after Blaise Pascal.

A light year is the distance that light, moving at about three lakh kilometres per second, covers in one year, which works out to roughly 9.46 trillion kilometres.

The candela takes its name from the candle, which was once used as a rough standard of light, and it is one of the seven base units of the SI system.

The newton is a derived unit: it is built from the kilogram, the metre and the second, since force equals mass times acceleration, and it can be written as one kilogram metre per second squared.

The SI system, adopted in 1960 by the General Conference on Weights and Measures, rests on seven base units: the metre, the kilogram, the second, the ampere, the kelvin, the mole and the candela.

One newton is the force that gives a mass of one kilogram an acceleration of one metre per second squared, which follows directly from the equation force equals mass times acceleration.

The Harappan script uses about four hundred picture-like signs, and it was written in the boustrophedon style, that is from right to left in the first line and then from left to right in the next, turning like an ox ploughing a field.

Dholavira stands on Khadir island in the Rann of Kutch. Unlike the usual two-part Harappan town, it is divided into three: a citadel, a middle town and a lower town, all enclosed by stone walls.

The seal shows a figure seated in a yogic posture with horns on its head and animals around it, usually described as an elephant, a tiger, a rhinoceros and a buffalo, with deer below the seat.

Daimabad lies on the Pravara, a tributary of the Godavari, in the Ahmednagar district of Maharashtra, and it marks the southern limit of the Harappan world.

The Harappan Civilisation is a Bronze Age culture, and no iron object has been recovered from any of its levels.

Mesopotamian texts list Meluha among the lands that sent ships carrying carnelian beads, ivory, timber and copper, and the goods named there match what Harappan sites produced.

A Harappan burnt brick was four units long, two units broad and one unit thick, and the same proportion turns up at sites hundreds of kilometres apart.

Kalibangan stands on the dry bed of the Ghaggar in the Hanumangarh district of Rajasthan. A field there, belonging to the pre-Harappan level, carries two sets of furrows crossing each other at right angles, showing that two crops were grown in the same plot at the same time.

He dug at Harappa on the bank of the Ravi in 1921, and the finds from that season identified a wholly unknown urban culture, which was named after the site.