Physics and Chemistry Quiz

A rocket accelerates from rest, reaching 300 m/s in 45 seconds. If it maintains this velocity for 20 minutes before decelerating to a stop in 30 seconds, calculate the total distance traveled:

• 360,000m

• 384,000m

• 396,000m

• 412,000m

Two trains approach each other on parallel tracks. Train A travels at 72 km/h and Train B at 90 km/h. If they are initially 450 km apart, how long will it take them to meet, accounting for their combined velocity?

• 2.5 hours

• 3 hours

• 3.5 hours

• 4 hours

A cyclist climbs a mountain with an average gradient of 7%. If they maintain 15 km/h and expend 400 watts of power, calculate the vertical ascent rate:

• 1.05 m/min

• 1.25 m/min

• 1.45 m/min

• 1.65 m/min

An aircraft flies at 800 km/h with a tailwind of 120 km/h. If the return journey faces a headwind of 90 km/h, calculate the round trip average speed:

• 720 km/h

• 740 km/h

• 760 km/h

• 780 km/h

A marathon runner maintains varying speeds: 14 km/h for first 21 km, 12 km/h for next 14 km, and 10 km/h for final 7.2 km. Calculate total race time:

• 2 hours 15 minutes

• 2 hours 22 minutes

• 2 hours 30 minutes

• 2 hours 38 minutes

An alloy contains 60% copper (density 8.96 g/cm³), 30% zinc (density 7.14 g/cm³), and 10% tin (density 7.31 g/cm³). Calculate its composite density:

• 8.14 g/cm³

• 8.25 g/cm³

• 8.37 g/cm³

• 8.49 g/cm³

A hollow titanium sphere has an outer radius of 5 cm and wall thickness of 0.5 cm. If its mass is 320 g, calculate its wall density:

• 4.1 g/cm³

• 4.5 g/cm³

• 4.9 g/cm³

• 5.3 g/cm³

A geologist measures a rock sample with mass of 425 g. Its volume displacement in water is 75 cm³, but its true volume is 80 cm³. Calculate its porosity percentage:

• 6.25%

• 7.50%

• 8.75%

• 10%

A metallic cube has a side length of 4 cm. Its mass is 224 g. If it's composed of an unknown metal, calculate its density:

• 4.4 g/cm³

• 4.8 g/cm³

• 5.2 g/cm³

• 5.6 g/cm³

A cylindrical copper wire has a diameter of 0.2 mm and total length of 100 m. Calculate its total mass:

• 0.88 kg

• 1.12 kg

• 1.36 kg

• 1.64 kg