Physical Science Review

How many valence electrons are in a necutral atom of nitrogen (N)?

• 2

• 3

• 5

• 15

A 100-gram sample of cerium 143 has a half life of 33 hours. How long will it take until there are only 6.25 grams of cerium 143 left?

• 66 hours

• 99 hours

• 132 hours

• 165 hours

What type of bond will form when an element from group 2 (IIA) bonds with an element from group 17 (VIIA)?

• hydrogen bond

• covalent bond

• metallic bond

• ionic bond

If a wave has a frequency of 0.4 Hz and a wavelength of 15m, what is its velocity?

• 0.2 m/s

• 6.0 m/s

• 38 m/s

• 60 m/s

A circuit has 2.25 amps of current and a resisitance of 4.00. What is the voltage differnece across the circuit?

• 9.00 V

• 6.25 V

• 1.78 V

• 0.56 V

Which elemet is classified as a metal?

• boron (B)

• antimony (Sb)

• phosphorus (p)

• cadmium(Cd)

A child fills a bucket with salt water and sand. How are the contents of the bucket classified?

• a soultion

• a compound

• a homogeneous mixture

• a heterogeneous mixture

A 1,500 kg truck has a net force of 4,200 N acting on it. What is the truck's acceleration?

• 6,300,000 m/s/s

• 2,700 m/s/s

• 2.8 m/s/s

• 0.36 m/s/s

As the wheels of a train move along the train tracks, what type of friction exists between the wheels and the tracks?

• fluid friction

• rolling friction

• sliding friction

• static friction

It takes 6.0 seconds for a pulley system tomlift a crate weighing 300. N to a height of 5.0 meters. How much power is required lift the crate?

• 360 W

• 250 W

• 10 W

• 0.1 W