Science quiz, September 2023

All of the following are motion in one direction except ..................................

• Car motion

• Swing motion

• Train motion

• Plane motion

Acceleration measuring unit is .............................

• m/sec.

• Km/h

• m²/sec.

• m/sec².

The relative speed becomes as maximum as possible when the observer ..................................................

• Moves in the same direction at equal speed.

• At rest

• Moves in the opposite direction at equal speed

• Moves in the opposite direction at half the speed.

A car covers 160 km in 2 hours. this means that its speed equal ...............................

• 22.22 m/sec.

• 100 Km/h

• 28.4 m/sec.

• 22.2 m/sec².

A car moves at 90 km/h speed, What is its relative speed relative to another car moves at 25 m/sec. in the same direction?

• 180 Km/h

• 20 m/s

• 100 Km/h

• Zero

A train moves at a uniform speed 20 m/s, The driver uses the brakes, the train moves with an acceleration of 5 m/sec².

How many time needed till the train stopped?

• 3 sec.

• 4 sec.

• 5 sec.

• 6 sec.

All of the following are from scalar physical quantities except .........................

• Mass

• Speed

• Relative speed

• Velocity

A racer covered a distance of 50 meter in a straight track in 5 sec., then he returned back walking in 20 sec.

So, his average speed equal ........................................

• 2 m/sec

• 3 m/sec.

• 4 m/sec.

• 5 m/sec.

A person covered 30 meter northward within 30 sec., then 60 meter southward within 30 sec.

So, his velocity equal ................................................

• 0.5 m/sec.

  northward

• 0.5 m/sec.

  southward

• 5 m/sec.

  northward

• 5 m/sec.

  southward

An object covers an equal distances in unequal intervals of time.

So, this object moves with ..............................................

• A uniform speed

• A non-uniform speed

• A relative speed = 0

• An average speed =0