1. Communication with lunar missions may require relay satellites for far-side operations. 2. Solar power is unsuitable for lunar missions due to long periods of darkness. 3. Rovers conduct in-situ analysis of lunar soil and rocks. Which are correct?

1. Lagrange points balance two-body gravity with centrifugal force on a small object. 2. All five Lagrange points offer stable satellite positions. 3. Objects at some Lagrange points need minimal fuel to stay in position. Which are correct?

1. L1 lies between the Earth and the Sun. 2. L2 lies beyond the Earth, opposite the Sun. 3. L3 is located on the far side of the Sun and cannot be directly observed from Earth. Which of the statements given above are correct?

1. Space telescopes are placed at L2 for stable observations. 2. L4 and L5 allow objects to remain in stable orbits due to gravitational balance. 3. Satellites at L1 can’t be used for solar observation as they’re too close to Earth. Which are correct?

Which are correct for Gaganyaan? 1. Crew module stays in LEO for a short flight, then undergoes controlled re-entry. 2. Early aborts need rapid separation and crew module stabilisation. 3. Re-entry thermal protection is mainly for deep-space radiation.

Which are correct for Gaganyaan? 1. Environmental Control & Life Support System regulates pressure, temperature, & oxygen in the crew module. 2. Re-entry uses only onboard autonomous guidance. 3. Ocean recovery with coordinated tracking and retrieval.

Which are correct for India’s human spaceflight program? 1. Astronaut training covers microgravity & high-acceleration simulations. 2. Focuses on indigenous capability with global collaboration. 3. Initial crewed mission tests long-duration habitation.

1. NISAR uses dual-frequency radar to monitor Earth’s surface changes. 2. It is designed to provide data useful for studying natural hazards. 3. It relies primarily on optical imaging for high-resolution surface mapping. Which are correct for NISAR?

Which are correct in reference to NISAR? 1. Synthetic Aperture Radar (SAR) works regardless of cloud and lighting conditions. 2. SAR needs sunlight to image Earth’s surface. 3. Dual-frequency radar improves surface and vegetation differentiation.

Which are correct for NISAR mission? 1. It will operate in a near-polar orbit to enable global coverage of Earth. 2. It can be used to monitor changes in ice sheets, forests, and land deformation. 3. It is also intended for deep space exploration.

What is correct for instruments onboard Aditya-L1? 1. Some payloads observe the solar corona; others study solar wind & particles. 2. All onboard instruments operate only in the visible spectrum. 3. Mission includes remote sensing & in-situ measurements.

What is correct for Aditya-L1? 1. Aims to study solar phenomena like coronal heating & solar flares. 2. Mission data help understand space weather & its impact on Earth. 3. Designed to directly study the Sun’s internal structure using seismic techniques.