1. The intensity of earthquake is measured by seismograph.
A. barometer
B. hydrometer
C. polygraph
D. seismograph
The intensity of earthquake is measured by seismograph. It is also known as seismometer. It records the motion of the ground during an earthquake. The Richter scale is a numerical value used to measure the power or magnitude of earthquakes.
2. 'Fathometer' is used to measure
A. earthquakes
B. rainfall
C. ocean depth
D. sound intensity
'Fathometer' is an instrument used to measure the depth of ocean. It was first developed by the signal company of Boston in the year 1925.
3. The apparatus' used to measure the intensity of light is known as
A. anemometer
B. calorimeter
C. luxmeter
D. altimeter
Luxmeter is an apparatus that is used for measuring the intensity of light, that hits or passes through a surface. It can also be used to clearly see and compare the impacts of different lighting conditions.
4. 'Pyrheliometer' is used for measuring
A. sun spots
B. solar radiation
C. air temperature
D. temperature of plants
'Pyrheliometer' is used for measuring solar radiation. Sunlight enters in this instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded.
5. Richter scale is used for measuring
A. velocity of sound
B. intensity of light
C. amplitude of seismic waves
D. intensity of sound
Richter scale is used for measuring amplitude of seismic waves. Richter scale was developed by Charles F. Richter in 1935, as a mathematical device for comparing the intensity of the earthquake.
6. The thermometer which is used to measure 
temperature is
A. gas thermometer
B. mercury thermometer
C. total radiation pyrometer
D. steam pressure thermometer
Total radiation pyrometer is used to measure 
temperature. It is a type of remote sensing thermometer used for measuring the temperature of surface. It can measure the temperature from to .
Gas thermometer has a temperature range of to . Mercury thermometer has a temperature range of to . Steam pressure thermometer has a temperature range of to .
7. Which one of the following devices is used to measure extremely high temperature?
A. Pyrometer
B. Photometer
C. Phonometer
D. Pycnometer
Pyrometer is used to measure extremely high temperature. It measures temperature by measuring radiation from the object, without having to be in contact.
8. The apparatus used for detecting lie is known as
A. polygraph
B. pyrometer
C. gyroscope
D. kymograph
The apparatus used for detecting lie is known as polygraph. It is also known as lie-detector. This instrument works by recording physiological phenomenon such as blood pressure, pulse rate and respiration of a human when he answer questions put to him by an operator. These data are then used as the basis for making a judgement as to whether or not the subject is lying.
9. Which one of the following thermometers is known as pyrometer?
A. Thermoelectric thermometers
B. Radiation thermometers
C. Gas thermometers
D. Liquid thermometers
Radiation thermometer is also known as pyrometer. It is a device which can determine the temperature of the surface from the amount of emission of thermal radiation from it. Pyrometer comes from a greek word, 'Pyro' meaning to fire and 'meter' meaning to measure.
10. 'Beaufort scale' is used to measure
A. atmospheric pressure
B. wind velocity
C. humidity
D. hydraulic pressure
'Beaufort scale' is used to measure wind velocity. It was invented by Admiral Sir Francis Beaufort to help sailors and describes the wind velocity (wind condition) at sea or on land.
11. Which one of the following instrument is used for locating submerged objects in an ocean?
A. Audiometer
B. Galvanometer
C. Sextant
D. SONAR
SONAR is used for locating submerged objects in an ocean.
The word SONAR stands for Sound Navigation and Ranging. It uses ultrasonic waves to measure the distance, direction and speed of underwater objects.
12. RADAR is used for
A. detecting objects by using light waves
B. reflecting sound waves to detect objects
C. determining the presence and location of objects with radio waves
D. tracking rain-bearing clouds
RADAR is used for determining the presence and location of objects with radio waves. RADAR stands for Radio wave Detection and Ranging. RADAR technique is used in various applications such as controlling air traffic, observation of weather, observation of planetary objects, space surveillance etc.
13. Dilatometer is used for the measurement of
A. electrical energy
B. mechanical energy
C. dimensional change in material
D. thermal energy
Dilatometer is used for the measurement of dimensional change in material as a function of temperature. A familiar application of a dilatometer, is the mercury in glass thermometer, in which the change in volume of the liquid column is read from a graduated scale.
14. Which of the following instrument measures blood pressure?
A. Spherometer
B. Anemometer
C. Sphygmomanometer
D. Ammeter
The blood pressure of human body is measured by an instrument called sphygmomanometer.
It consists of an inflatable rubber cuff which is applied to the arm. This cuff is then connected to a column of a mercury next to a graduated scale, which indicates the blood pressure of the body.
15. The velocity of wind is measured by
A. barometer
B. anemometer
C. hydrometer
D. wind vane
The velocity of wind is measurd by anemometer. It has a spinning wheel. The stronger the wind blows, the faster the wheel rotates. The anemometer counts the number of rotations, which is used to calculate wind speed.
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