Carbon Dating

Q.

What is carbon dating?

Q.

Match the following columns:
$\begin{array}{cc}\underset{\left(\text{Respiratory substrate}\right)}{Column-I}& \underset{\left(\text{RQ value}\right)}{Column-II}\\ a)\text{Glucose}& 1)0.7\\ b)\text{Tripalmitin}& 2)0.9\\ c)\text{Protein}& 3)1.33\\ d)\text{Malic acid}& 4)1.0\end{array}$

1. a- 4, b - 1, c - 2, d - 3

2. a - 1, b - 1, c - 3, d - 4

3. a - 4, b - 3, c - 2, d - 1

4. a - 4, b -2, c - 1, d - 3

Q.

Carbon dating is used to determine the age of fossils. It is estimated by:

1. Measuring the depth of excavated fossil.
2. Calculating the ratio of C-14 to C-12.
3. Size of organs that are vestegial in present-day species.
4. All of the above.

Q.

Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms A, B and C.

Name the radiation $B$ which is unaffected by the electrostatic field.

Q. Carbon dating is used to

1. assess the age of fossils.
2. assess the amount of radioactivity.
3. assess the rate of radioactivity.
4. none of the above.

Q. Statement 1: Age of the fossils are determined by carbon dating method.

Statement 2: Radioactive isotopes of elements like carbon and potassium breakdown at unknown rate.

1. Both statements are correct.
2. Both statements are incorrect.
3. Only statement 1 is correct.
4. Only statement 2 is correct.

Q. Choose statements that are not relevant to carbon dating.

1. Used in paleontology for determining the age of fossils
2. Ratio of C-14 to C-12 is not used to find the date of passing of organisms
3. Time passed since the death of a plant or animal can be calculated
4. Based upon the radioactive decay of naturally occurring C-14

Q. Age of fossils can be detected by

1. Residual quantity of calcium
2. Phylum of other mammals
3. Structure of bones
4. Quantity of radioactive carbon compound

Q.

Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms A, B and C.

Name the radiation which is used in carbon dating.

Q. “Carbon dating" is the technology that can find out how old an object is.

1. True
2. False

Q. Mention three important features of fossils which help in the study of evolution.

Q. In an ore containing uranium, the ratio of $U^{238}$ to $P{b}^{206}$ is $3$. Calculate the age of the ore, assuming that all the leas present in the ore is the final stable product of $U^{238}$. Take the half-life of $U^{238}$ to be $4.5\times {10}^9$ yr.

1. $1.6\times {19}^{3}yr$
2. $1.867\times {10}^{9}yr$
3. $2\times {10}^{5}yr$
4. $1.5\times {10}^{4}yr$

Q. The method in which fossils can be obtained from tree sap is _____________.

1. petrifaction
2. compression
3. preservation
4. replacement

Q. Why does the radiation C deflect more than A?

Q. Name the radiation which is used in carbon dating.

Q. When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of ${}^{14}C$ per gram per minute. A sample from an ancient piece of charcoal shows . ${}^{14}C$ activity to be 12.3 disintegration per gram per minute . how old is this sample? half-life of ${}^{14}C$ is 5730 y.

Q. Carbon dating is based upon the radioactive decay of naturally occuring .

1. C-12
2. C-13
3. C-14

Q. Which among the three causes the least biological damage externally?

Q. Carbon $14$ dating is used to estimate the age of an archeological specimen.

1. True
2. False

Q. Name the radiation B which is unaffected by the electrostatic field.

Q. How are C-14 and U-238 dating used together in order to determine fossil ages?

Q. Archaeologists use carbon dating technology to find the:

1. Location of the artifact
2. Methods to use the artifact
3. Size of the artifact
4. Age of the artifact

Q. A pieces of bone an animals from a ruin is found to have ${}^{14}C$ activity of 12 disintegrations per minute per gm of its carbon content. The${}^{14}C$ activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life ${}^{14}C$is $t_{1/2}$=5760 years)

1. 1672 years
2. 2391 years
3. 3291 years
4. 4453 years