Astronomical units

Q. Tarun got to know that the next nearest star to us is Alpha Centauri and is at a distance of 4 light years from the Earth. What does it mean?

1. Light has to travel 48 months to reach that star.

2. Light has to travel 40 years to reach that star.

3. Light has to travel 43 months to reach that star.

4. Light has to travel 4 months to reach that star.

Q.

If the speed of light is equal to $3\times {10}^{8}m{s}^{-1}$, how many kilometers will make up 1 light year?

1. $946\times {10}^{13}$km

2. $1.095\times {10}^{11}$km

3. $1095$ km

4. $9.46\times {10}^{12}$km

Q.

Light year is a unit of:

1. time

2. distance

3. speed

4. temperature

Q. Light year is a unit of .

1. time
2. speed
3. distance
4. light intensity

Q. Light year is a unit of .

1. speed
2. distance
3. light intensity
4. time