281. Indian Institute of Remote Sensing is situated-

1. In Ahmedabad
2. In Dehradun
3. In Sriharikota
4. None of the above

Option “2” is correct.
Indian Institute of Remote Sensing is situated in Dehradun.
282. What is the minimum distance (in meters) required to hear an echo?

1. 10
2. 13
3. 17
4. 21

Option “3” is correct.
Echo is a reflection of sound that arrives at the listener with a delay after the direct sound.The reflecting object must be more than 17m from the sound source for echo to be perceived by a person located at the source.
283. Why does a Black board appears black in colour?

1. It reflects black colour
2. It absorbs black colour
3. It reflects all colours
4. It absorbs all the colours

Option “4” is correct.
A black board appears black because it absorbs all the colors of white light and reflects none.
284. Which of the following instrument is used to measure Soil Water Tension?

1. Photometer
2. Pyrometer
3. Psychrometer
4. Tensiometer

Option “4” is correct.
A tensiometer in soil science is a measuring instrument used to determine the Soil water tension.Such tensiometers are used in irrigation scheduling to help farmers and other irrigation managers to determine when to water. It can also be used in the scientific study of soils and plants.
285. What is the SI unit of Force?

1. Pascal
2. Boyle
3. Newton
4. Watt

Option “3” is correct.
The SI unit of Force is Newton. One Newton is equal to 1 kilogram meter per second squared.
286. Which one of the following is a bad Thermal Conductor?

1. Aluminum
2. Copper
3. Glass
4. Silver

Option “3” is correct.
Glass is bad thermal conductor and is a good insulator.It has tightly held electrons which did not allow heat to flow through it.
287. Who invented first working laser?

1. A. H. Taylor
2. W. K. Roentgen
3. T. H. Mailman
4. Fred Morrison

Option “3” is correct.
LASER (LIGHT AMPLIFICATION BY STIMULATED EMMISSION OF RADIATION)is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The first laser was built in 1960 by Theodore H. Maiman.
288. In the absence of the earth’s atmosphere, sky would appear-

1. Blue
2. Deep red
3. White
4. Black

Option “4” is correct.
In absence of earth’s atmosphere, sky would appear black due to absence of scattering phenomena.
289. Temperature of distant luminous bodies can be determined by –

1. Mercury thermometers
2. Gas thermometers
3. Pyrometers
4. Colour thermometers

Option “3” is correct.
Temperature of distant luminous bodies can be determined by Pyrometers.
290. Energy travels from Sun to Earth through –

1. Conduction
2. Convection
3. Radiation
4. Modulation

Option “3” is correct.
Energy travels from Sun to Earth through Radiation.
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