QQuestion
(a) In the following atoms, which one is a radioisotope? Give one use of it.
O-16, C-14, N-14, He-4
(b) Name the class of the lever shown in the picture below:
✓Answer
(a) C-14
C14 is used to determine the age of ancient biological materials, such as fossils, bones, or archaeological samples (up to about 50,000 years old).
(b) Class II lever
Explanation:
In a class II lever, the load lies between the fulcrum and the effort.
Related Questions
More ICSE Easy level questions
Copy and complete the nuclear reaction by filling in the blanks.
A radioactive element is kept in an evacuated chamber. The rate of radioactive emission will: (a) decrease (b) increase (c) remain unchanged (d) depend on the temperature
A radioactive nucleus containing 128 nucleons emits a β-particle. After β-emission the number of nucleons present in the nucleus will be: (a) 128 (b) 129 (c) 124 (d) 127
(a) Complete the following radioactive reaction: (b) Uranium is available in two forms U-235 and U-238. Which of the two isotopes of Uranium is more fissionable?
(a) When does the nucleus of an atom tend to become radioactive? (b) Name a single pulley in which displacement of load and effort is not the same. (c) State one advantage of this pulley.
How is the radioactivity of a radio isotope affected if it undergoes a chemical change? Give a reason for your answer.
Give two differences between nuclear fission and nuclear fusion.
(a) Which nuclear radiation will travel undeviated in an electric field? (b) How can one stop the radiations escaping from a nuclear reactor in a nuclear power plant? (c) Name one internal source of background radiations.
(a) Complete the following nuclear changes: (b) Name the nuclear radiation which has the highest ionizing power.
Which of the following radiations suffer maximum deflection in a magnetic field? (a) Alpha radiations (b) Beta radiations (c) Gamma radiations (d) X-radiations
Study the reaction given below and answer the questions that follow: (a) Name the process depicted in the reaction. (b) What is the value of X represented by the mass number of the intermediate uranium nucleus? (c) Identify Y, the missing product of the reaction.
Curium is a radioactive element with the symbol named in honour of Madam Curie. The graph of number of protons vs number of neutrons for some elements is shown below: (a) Which point on the graph indicates the element Cm? (b) Which point on the graph indicates daughter nucleus after Cm undergoes radioactive decay of 1α followed by 2β? (c) State the mass number of the daughter nucleus.