RRB NTPC Geography quiz for Stage I : 01/08/2019

Exp.Latent heat is the heat energy per mass unit required for a phase change to occur. Normally when heat energy is added to or removed from an object, the temperature of the object changes; however, during phase changes, the temperature of an object stays constant. The temperature remains the same because energy is required for an object to change phases.So when you add heat to a liquid, you are actually causing the molecules to vibrate. The latent heat is the energy required to change the molecular movement. Each substance has a unique latent heat value.

Q2.What is dew point?

ओसांक क्या है

(a) The temperature at which an air becomes unsaturated/ वह तापमान जिस पर एक हवा असंतृप्त हो जाती है

(b) The temperature at which an air becomes cold from warm/ वह तापमान जिस पर हवा गर्म से ठंडी हो जाती है

(c) The temperature at which an air becomes saturated/ वह तापमान जिस पर एक हवा संतृप्त हो जाती है

(d) None of the above/ उपरोक्त में से कोई भी नहीं

Exp.The dew point is the temperature to which air must be cooled to become saturated with water vapor. When further cooled, the airborne water vapor will condense to form liquid water.

Q3.What is Normal Lapse rate.

सामान्य गिरावट दर क्या है

(a) Decrease of temperature with increasing height/ बढ़ती ऊंचाई के साथ तापमान में कमी

(b) Increase of temperature with increasing height/ बढ़ती ऊंचाई के साथ तापमान में वृद्धि

(c) Decrease of temperature with decreasing height/ घटती ऊंचाई के साथ तापमान में कमी

(d) Increasing of temperature with decreasing height/ घटती ऊंचाई के साथ तापमान में वृद्धि

Exp.Lapse rate, rate of change in temperature observed while moving upward through the Earth’s atmosphere. The lapse rate is considered positive when the temperature decreases with elevation, zero when the temperature is constant with elevation, and negative when the temperature increases with elevation (temperature inversion).

Exp.A radiation inversion commonly occurs when the evening air is still and there are no clouds to trap heat. Surface temperature drops as longwave radiation emitted by the Earth escapes to space. Since a land surface radiates more heat than the air, ground is cooled more rapidly than the air at great heights during night time. Consequently the coldest air lies at the ground and is overlaid by warmer air.

Exp.Frontal fog forms near a front when raindrops, falling from relatively warm air above a frontal surface, evaporate into cooler air close to the Earth’s surface and cause it to become saturated.The visibility in an ice fog is often considerably worse than that in a water fog containing the same concentration of condensed water.

Exp.Relative humidity is the ratio of the current absolute humidity to the highest possible absolute humidity (which depends on the current air temperature). A reading of 100 percent relative humidity means that the air is totally saturated with water vapor and cannot hold any more, creating the possibility of rain.

Exp.Igneous rocks form from the cooling of magma – molten materials in the earth’s crust.

Exp.Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite.

Exp.Igneous rocks are formed from magma, the molten material from the center of the Earth. Igneous rocks begin the rock cycle, and are therefore called primary rocks.

Exp.Loess is a clastic, predominantly silt-sized sediment that is formed by the accumulation of wind-blown dust.