NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1500 - 1503 of 5119

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Passage

Read the passage given below and answer the questions that follow:

In a living organism, the quantity of C14 is the same as in the atmosphere. But in organisms which are dead, no exchange takes place with the atmosphere and by measuring the decay rate of14 C in the old bones or wood, the time taken for the activity to reduce to this level can be calculated. This gives the age of the wood or bone.

Given: for14C is 5370 years and the ratio of is 1.3 ⨯ 10-12 .

Question 1500 (3 of 3 Based on Passage)

Question MCQ▾

The decay rate in another piece is found to be 0.30 Bq per gm then we can conclude,

Choices

Choice (4)Response

a.

he sample is very recent

b.

There is a statistical error

c.

The observed decay is not that of14 C alone

d.

All a., b. and c. are correct

Edit

Question 1501

Question MCQ▾

For thorium A = 232 and Z = 90, at the end of some radioactive disintegrations we obtain an isotope of lead with A = 208 and Z = 82. Then the number of α and β particles emitted are,

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 1502

Question Assertion-Reason▾

Assertion(Ꭺ)

A room can be warmed by opening the door of a refrigerator in a closed room

Reason(Ꭱ)

Head flows from lower temperature (refrigerator) to higher temperature (room) .

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Edit

Question 1503

Question Assertion-Reason▾

Assertion(Ꭺ)

Electron capture occurs more often than positron emission in heavy elements.

Reason(Ꭱ)

Heavy elements exhibit radioactivity.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Edit