What type of microscope would be most appropriate for evaluating similarities between a test bullet and one recovered from a crime scene? a) compound b) comparison c) stereoscope eliminate d) scanning electron

B. Comparison

Comparison microscope is used for the comparison of the suspected specimen bullet or cartridge obtained from the scene of crime with the one which is obtained after test firing. It exhibit two sample stages and the field of view of two bullets is compelled into one view so that the similarities and differences among the samples can be observed properly by direct comparison. The samples can be rotated to 360° to allow the comparison of surface features.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.