Top 50 ISRO GK Questions for Competitive Exams: Practice Now

C) IRS series (Indian Remote Sensing)

Explanation: ISRO uses the Indian Remote Sensing (IRS) satellite series for Earth observation. The IRS series is the largest constellation of remote sensing satellites for civilian use in operation today. These satellites are used for various applications such as agriculture, forestry, land-use mapping, disaster management, urban planning, and ocean resources monitoring. Some of the prominent satellites in this series include IRS-1A, IRS-P4 (Oceansat-1), and Cartosat-1.

A) Radar Imaging Satellite

Explanation: RISAT stands for Radar Imaging Satellite. These satellites use synthetic-aperture radar (SAR) to capture images of the Earth’s surface, even under cloud cover and during the night. They are used for surveillance, agriculture, forestry, and disaster management.

B) 1994

Explanation: The first successful launch of the Polar Satellite Launch Vehicle (PSLV) occurred on October 15, 1994. This launch marked a significant achievement for ISRO, as the PSLV has since become one of the most reliable launch vehicles for deploying satellites into space.

B) PSLV-C21

Explanation: The PSLV-C21 mission, launched on September 9, 2012, marked ISRO’s 100th space mission. The PSLV-C21 successfully placed the French satellite SPOT 6 and the Japanese micro-satellite PROITERES into orbit.

C) RLV-TD

Explanation: The Reusable Launch Vehicle-Technology Demonstrator (RLV-TD) is ISRO’s experimental program aimed at developing a reusable space vehicle. The program aims to reduce the cost of access to space by reusing the launch vehicle.

B) 4,000 kg to GTO

Explanation: The GSLV Mk III, ISRO’s most powerful launch vehicle, has a payload capacity of up to 4,000 kg to Geosynchronous Transfer Orbit (GTO) and up to 10,000 kg to Low Earth Orbit (LEO). This capacity makes it suitable for launching heavier satellites and for interplanetary missions.

B) Indian Space Research Organisation Satellite Centre (ISAC)

Explanation: The Indian Space Research Organisation (ISRO) Satellite Centre (ISAC) in Bengaluru is the primary centre for designing, building, and testing satellites in India. It plays a crucial role in India’s space program, developing satellites for various purposes like communication, navigation, remote sensing, and scientific research.

B) Indira Gandhi

Explanation: Indira Gandhi was the Prime Minister of India during the founding of the Indian Space Research Organisation (ISRO). ISRO was established on August 15, 1969, under the leadership of Dr. Vikram Sarabhai. However, at the time of ISRO’s founding, Indira Gandhi was not in office. Indira Gandhi became Prime Minister later in 1966. During ISRO’s founding, Indira Gandhi was the current Prime Minister.

C) GSLV Mk III

Explanation: The GSLV Mk III, also known as LVM-3 (Launch Vehicle Mark-3), is ISRO’s heaviest rocket. It is capable of carrying heavier payloads into space and has been used for missions like Chandrayaan-2.

B) PSLV-C37

Explanation: The PSLV-C37 mission, launched on February 15, 2017, set a world record by launching 104 satellites in a single flight. This mission demonstrated ISRO’s capability to deploy multiple satellites in various orbits in a single mission.