Question : Why does a black board appears black in colour?

Option 1: It reflects black colour

Option 2: It absorbs black colour

Option 3: It reflects all colours

Option 4: It absorbs all the colours

Question : $x$ does $\frac{1}{4}$ of a job in 6 days. $y$ completes the rest of the job in 12 days. Then $x$ and $y$ could complete the job together in:

Option 1: $9$ days

Option 2: $9\frac{3}{5}$ days

Option 3: $8\frac{1}{8}$ days

Option 4: $7\frac{1}{3}$ days

Question : A can do a task in 8 days, while B can do it in 18 days. In how many days will the work be completed if they both work on alternate days, starting with B?

Option 1: $11 \frac{1}{3}$ days

Option 2: $12 \frac{1}{3}$ days

Option 3: $10$ days

Option 4: $10 \frac{1}{3}$ days

Question : Sound travels 330 metres in a second. When the sound follows the flash of lightning after 10 seconds, the thundercloud will be at a distance of:

Option 1: 1300 metres

Option 2: 2000 metres

Option 3: 3650 metres

Option 4: 3300 metres

Question : Sound travels at 330 metres per second. The distance (in kilometres) of a thundercloud when its sound follows the flash after 10 seconds is:

Option 1: 0.33 km

Option 2: 3.3 km

Option 3: 33 km

Option 4: 33.3 km