Space Communication — Physics

Home › PYQ › Physics › Space Communication

Space Communication

3 questions

All (3) Unattempted (3) Skipped (0) Correct (0) Wrong (0)

Q.1

WBCS Prelims 2015

Satellites provide information about

A. Forest and vegetative cover

B. Rivers and their courses

C. Advancing storms and cyclones

D. All of the above

Explanation

Why Correct: Remote sensing satellites use optical, infrared, and microwave sensors to monitor forest cover through vegetation indices like NDVI, track river courses via high-resolution imagery, and detect cyclones through cloud patterns and sea surface temperature data.
Distractor Analysis: Forest and vegetative cover monitoring uses multispectral imaging to assess biomass and deforestation. River course mapping employs synthetic aperture radar to penetrate cloud cover and track changes. Storm and cyclone tracking utilizes geostationary satellites for continuous weather observation and early warning systems.
Takeaway: India's INSAT series provides meteorological data, while Resourcesat and Cartosat support land and water resource management.

Answer or skip previous question to unlock.

Q.2

WBCS Prelims 2012

The first remote sensing satellite from India was :

A. P6

B. P4

C. IRS 1A

D. CARTOSAT 1

Explanation

Why Correct: IRS 1A launched on March 17, 1988 from Baikonur Cosmodrome, Kazakhstan aboard a Soviet Vostok rocket, marking India's first dedicated remote sensing satellite.
Distractor Analysis: P6 refers to IRS-P6 (Resourcesat-1) launched in 2003. P4 refers to IRS-P4 (Oceansat-1) launched in 1999. CARTOSAT-1 launched in 2005 as India's first stereoscopic imaging satellite.
Takeaway: Aryabhata, launched in 1975, was India's first satellite overall, while IRS 1A specifically initiated India's remote sensing program.

Answer or skip previous question to unlock.

Q.3

WBCS Prelims 2010

The minimum number of artificial satellites required for communication throughout the globe is

A. 1

B. 2

C. 3

D. 4

Explanation

Why Correct: Three geostationary satellites placed 120 degrees apart in equatorial orbit provide complete global coverage except for polar regions above 81 degrees latitude.
Distractor Analysis: One satellite covers only about one-third of Earth's surface. Two satellites leave significant gaps in coverage. Four satellites provide redundancy and better coverage but are not the theoretical minimum.
Takeaway: Geostationary satellites orbit at 35,786 km altitude with orbital period matching Earth's rotation, appearing stationary from ground.

Sign in to Papersetters