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What is the primary purpose of false color composites in satellite imagery?

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Important Questions on Units and Measurements

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Physics>Mechanics>Units and Measurements>Errors in Measurement
The current voltage relation of diode is given by I = (e1000 V/T - 1) mA, where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error measuring ± 0.01 V  while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA ?
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
In the density measurement of a cube, the mass and edge length are measured as 10.00±0.10 kg and 0.10±0.01 m, respectively. The error in the measurement of density is:
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
With the help of a suitable diagrammatic representation explain HSK pathway.
HARD
Physics>Mechanics>Units and Measurements>Errors in Measurement
Discuss in detail different types of errors arising in the measurement of the physical quantities. State general method of estimating the error in a combined calculation.
HARD
Physics>Mechanics>Units and Measurements>Errors in Measurement
The values of measurement of a physical quantity in five trials were found to be 1.51, 1.53, 1.53, 1.52 and 1.54. Then,
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
In the screw gauge, the screw should be moved in the same direction to avoid which of the following error?
MEDIUM
Physics>Mechanics>Units and Measurements>Errors in Measurement
The measuring range of a measuring cylinder is 50 mL. If its least count is 0.5 mL, then the space between 15 mL and 20 mL should be divided into 
MEDIUM
Physics>Mechanics>Units and Measurements>Errors in Measurement
Show that error combine in similar way in addition and subtraction operation.
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
The least count of a stopwatch is 0.2 s. The time of 20 oscillations of a pendulum is measured to be 25 s. The percentage error in the measurement of time will be
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate by using the formula p=Fl2. If the maximum errors in the measurement of force and length are 4% and 2% respectively, then the maximum error in the measurement of pressure is
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
A physical quantity x is related to four measurable quantities a, b, c and d as follows

x = a2b3c5/2d–2

The percentage error in the measurement of a, b, c and d are 1 %, 2 %, 3 % and 4 % respectively. What is the percentage error in quantity x ?
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
Time for 20 oscillations of a pendulum is measured as t1=39.6 s; t2=39.9 s; t3=39.5 s.  What is the accuracy of the measurement?
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
A research worker takes 100 observations in an experiment. If he repeats the same experiment by taking 500 observations, how is the probable error affected?
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Physics>Mechanics>Units and Measurements>Errors in Measurement
A voltmeter with resistance 500 Ω is used to measure the emf of a cell of internal resistance 4 Ω. The percentage error in the reading of the voltmeter will be
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement

The main scale of a vernier calipers reads in milimeter and its vernier is divided into 10 divisions which coincides with 9 divisions of the main scale. Find the reading for shown situation in mm.

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EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
The density of the material of a cube is measured by measuring its mass and length of its side. If the maximum errors in the measurement of mass and the length are 3 % and 2 % respectively. The maximum error in the measurement of density is
MEDIUM
Physics>Mechanics>Units and Measurements>Errors in Measurement
While measuring the length of an object it was observed that the zero of the vernier lies between 1.4 and 1.5 of the main scale and the fifth vernier division coincides with the main scale division. If the length of the object measured is l⁡ , then the value of l⁡ - 1 . 4 in terms of the least count C of the instrument is
MEDIUM
Physics>Mechanics>Units and Measurements>Errors in Measurement
An unknown body is measured with a meter scale of unequal length, if the mass appears 10 g and 11 g when it is kept on both the pans, respectively. The true mass is
EASY
Physics>Mechanics>Units and Measurements>Errors in Measurement
Cotyledons are also called-
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Physics>Mechanics>Units and Measurements>Errors in Measurement

Four measuring cylinders with different least counts are shown in figures A, B, C and D. The most suitable cylinder for measuring the volume of a cube of side nearly 1 cm is.