Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt decreases
2. BThe balloon bursts
3. CIt increases
4. DIt stays exactly the same

What is plasma, as a state of matter?

1. AA very hot gas in which atoms have lost electrons and become ions
2. BA solid that conducts electricity
3. CThe liquid part of blood
4. DA liquid that has been cooled below its freezing point

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. AIron
2. BSodium
3. CHelium
4. DOxygen

Which list is in order from smallest to largest mass?

1. AMilligram, gram, kilogram
2. BMilligram, kilogram, gram
3. CGram, milligram, kilogram
4. DKilogram, gram, milligram

When the diaphragm contracts and the chest cavity gets bigger, what happens to the air pressure inside the lungs?

1. AIt rises, so air flows in
2. BIt does not change
3. CIt falls, so air flows out
4. DIt falls, so air flows in

What are London dispersion forces?

1. AWeak, temporary attractions caused by shifting electrons in molecules
2. BStrong bonds formed by transferring electrons
3. CAttractions between a hydrogen atom and a metal ion
4. DForces that hold protons together in the nucleus

Why is gamma radiation used to sterilise sealed medical supplies such as syringes?

1. AIt adds a protective chemical coating to the items
2. BIt passes through the packaging and kills microbes without making the items radioactive
3. CIt heats the items to very high temperatures, so the microbes are burned away inside the pack
4. DIt is stopped by the packaging, so it only cleans the outside

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AThe gas inside the bag is heated strongly by the mountain sunlight
2. BThe outside air pressure is lower, so the gas inside expands
3. CThe bag becomes thinner and weaker at altitude
4. DMore gas is produced by the crisps at altitude