We see colors because of the way light is reflected off of objects or substances. Light can either be absorbed into the object (or substance) or reflected. If an object or substance absorbs all wavelengths (colors) except blue, blue will be reflected and that is the color we see. If a substance absorbs all wavelengths except red and yellow the object will appear orange. If an object or substance absorbs no wavelengths but reflects them all, it is white - not black, as you might think. The color white is a combination of all colors. Black is the absence of any color. Space is black because there are no substances or objects to reflect back any color (or all colors, which would make it white). That is also why the astronauts see the earth as we see it in photos, but the space around it is black. The light from the sun is reflected back as the blues and greens and browns that we see, but the space around the earth is just that - empty space and therefore does not reflect back any colors, so it is black.

Correct Option: C

We see colors because of the way light is reflected off of objects or substances. Light can either be absorbed into the object (or substance) or reflected. If an object or substance absorbs all wavelengths (colors) except blue, blue will be reflected and that is the color we see. If a substance absorbs all wavelengths except red and yellow the object will appear orange. If an object or substance absorbs no wavelengths but reflects them all, it is white - not black, as you might think. The color white is a combination of all colors. Black is the absence of any color. Space is black because there are no substances or objects to reflect back any color (or all colors, which would make it white). That is also why the astronauts see the earth as we see it in photos, but the space around it is black. The light from the sun is reflected back as the blues and greens and browns that we see, but the space around the earth is just that - empty space and therefore does not reflect back any colors, so it is black.

The Supernova is a stellar explosion that is more energetic than a nova. The explosion expels much or all of a star’s material. Supernovae can be triggered in one of two ways: by the sudden re-ignition of nuclear fusion in a degenerate star; or by the collapse of the core of a massive star. The core of an aging massive star may undergo sudden gravitational collapse, releasing gravitational potential energy that can create a supernova explosion. Alternatively a white dwarf star may accumulate sufficient material from a stellar companion (either through accretion or via a merger) to raise its core temperature enough to ignite carbon fusion, at which point it undergoes runaway nuclear fusion, completely disrupting it.

Correct Option: B

The Supernova is a stellar explosion that is more energetic than a nova. The explosion expels much or all of a star’s material. Supernovae can be triggered in one of two ways: by the sudden re-ignition of nuclear fusion in a degenerate star; or by the collapse of the core of a massive star. The core of an aging massive star may undergo sudden gravitational collapse, releasing gravitational potential energy that can create a supernova explosion. Alternatively a white dwarf star may accumulate sufficient material from a stellar companion (either through accretion or via a merger) to raise its core temperature enough to ignite carbon fusion, at which point it undergoes runaway nuclear fusion, completely disrupting it.

The Government of India launched the Integrated Guided Missile Development Program in 1983 to achieve self sufficiency in the development and production of wide range of Ballistic Missiles, Surface to Air Missiles etc. Prithvi was the first missile to be developed under the Program. DRDO attempted to build Surface-to-air Missile under Project Devil. The Prithvi missile project encompassed developing 3 variants for use by the Indian Army, Indian Air Force and the Indian Navy. Over the years these specifications underwent a number of changes. While the codename Prithvi stands for any missile inducted by India into its armed forces in this category, the later developmental versions are codenamed as Prithvi II and Prithvi III. Prithvi I class was a surface-tosurface missile having a maximum warhead mounting capability of 1,000 kg, with a range of 150 km. It has an accuracy of 10 – 50 metres and can be launched from Transporter erector launchers. This class of Prithvi missile was inducted into the Indian Army in 1994.

Correct Option: B

The Government of India launched the Integrated Guided Missile Development Program in 1983 to achieve self sufficiency in the development and production of wide range of Ballistic Missiles, Surface to Air Missiles etc. Prithvi was the first missile to be developed under the Program. DRDO attempted to build Surface-to-air Missile under Project Devil. The Prithvi missile project encompassed developing 3 variants for use by the Indian Army, Indian Air Force and the Indian Navy. Over the years these specifications underwent a number of changes. While the codename Prithvi stands for any missile inducted by India into its armed forces in this category, the later developmental versions are codenamed as Prithvi II and Prithvi III. Prithvi I class was a surface-tosurface missile having a maximum warhead mounting capability of 1,000 kg, with a range of 150 km. It has an accuracy of 10 – 50 metres and can be launched from Transporter erector launchers. This class of Prithvi missile was inducted into the Indian Army in 1994.

INS Viraat is a Centaur class aircraft carrier currently in service with the Indian Navy. INS Viraat is the flagship of the Indian Navy, the oldest carrier in service and one of two aircraft carriers based in the Indian Ocean Region. Viraat is currently the second largest ship in the Indian Navy after the INS Jyoti. Viraat was completed and commissioned in 1959 as the Royal Navy’s HMS Hermes and was transferred to India in 1987.

Correct Option: C

INS Viraat is a Centaur class aircraft carrier currently in service with the Indian Navy. INS Viraat is the flagship of the Indian Navy, the oldest carrier in service and one of two aircraft carriers based in the Indian Ocean Region. Viraat is currently the second largest ship in the Indian Navy after the INS Jyoti. Viraat was completed and commissioned in 1959 as the Royal Navy’s HMS Hermes and was transferred to India in 1987.

Sunlight doesn’t light up space because there is nothing there for it to light up. Light in space travels in straight lines, so we only see sunlight when we look at the sun. As for the rest of the universe, if we assume an infinite universe, we would expect it to be bright with the light of infinity of stars. This is called Olbers’ paradox. But the intensity of the light decreases with the square of the distance, and at some point the stars are too far away and receding too fast for their light to ever reach us. So the actual amount of starlight from very distant stars is negligible.

Correct Option: D

Sunlight doesn’t light up space because there is nothing there for it to light up. Light in space travels in straight lines, so we only see sunlight when we look at the sun. As for the rest of the universe, if we assume an infinite universe, we would expect it to be bright with the light of infinity of stars. This is called Olbers’ paradox. But the intensity of the light decreases with the square of the distance, and at some point the stars are too far away and receding too fast for their light to ever reach us. So the actual amount of starlight from very distant stars is negligible.