WorksheetsChapter 8 Radioactivity
Total questions: 20
Worksheet time: 16mins
Who is the scientist's name is used as the radioactivity S.I. unit?
Wilhelm Roentgen
Henri Becquerel
Pierre Curie
Marie Curie
50% of cobalt-60 atom decays after 5 years. Calculate the mass of cobalt-60 after 20 years, given that its original mass is 16g.
1g
2g
3g
4g
Which statement is true about radioactive decay?
A random and non-spontaneous process
A random and spontaneous process
The stable nucleus becomes an unstable nucleus
Does not emit radioactive radiation
The following radioactive radiation shall be transmitted when a radioactive material decay except
Alpha particle
Beta Particle
Gamma-ray
Cosmic ray
Which of the following device is used to measure the radiation dose?
Ammeter
Voltmeter
Dosimeter
Multimeter digital
Which of the following is/are ionising radiation?
Infrared
X-ray
Gamma-ray
visible light
Beta ray
Which of the following is/are the man-made source of ionising radiation?
nuclear accident
cosmic ray
nuclear test
radioisotope for medical purpose
Diagram shows atom X. Given p is proton while n is neutron. What can you conclude about atom X?
Formed positive ion
Formed negative ion
It is a neutral atom
Contrary to Dalton's Atomic theory
Why are fruits preserved using gamma rays are safe to eat?
The dosage used is at the safe level
Gamma-ray from safe radioactive material is used
Gamma-rays are only emitted for 1 second
Gamma-rays are actually not harmful to health
Diagram shows the use of a radioactive substance in controlling the thickness of the paper. Which of the following is used to control the thickness of paper?
X-ray
Alpha ray
Beta ray
Gamma-ray
Which of the following has the characteristics stated below?
-Negatively charged
-It is an ionising radiation
-Can be blocked by aluminium
Alpha ray
Beta ray
Gamma-ray
radiowaves
Why is gamma-ray used to kill cancer cells in the medical field?
It has a short half-life
It can be blocked by a piece of paper
It can be used easily
It has a high penetration power
The following shows the similarities among alpha particles, beta particles, and gamma-ray, except
All three rays are radioactive rays
They cannot be seen with the naked eye
They are all particles
They are harmful if not handled with the correct procedure.
What type of radioactive radiation is used by the machine to treat cancer?
Alpha ray
Beta ray
Gamma-ray
X-ray
Choose the correct statement.
Dalton atomic Theory proposed that the atom is a divisible small sphere
Ions are positively charged atom
An atom changes to an ion when it loses or receives electrons
An example of non-ionising radiation is infrared
An example of ionising radiation is neutron
Choose the correct uses of beta rays.
In the field of defense as a nuclear bomb
Control the thickness of the metal sheet
Determine the rate of absorption of phosphate fertilisers in plants
preserves food such as fruits
Alpha rays have the highest ionising power.
TRUE
FALSE
What type of radioactive radiation is used by the smoke detector?
Alpha ray
Beta ray
Gamma-ray
Infrared
Gamma-rays from _______________ are used to kill bacteria in food.
cobalt-60
phosphorus-32
Iodine-131
Caesium-137
Sodium-24 is used to______
study the age of ancient artifacts
detect underground water pipe leak
determine the rate of absorption of phosphate fertilisers in plants.
determines where the blood clots inside the body
produce nuclear bomb
