Physics Form IV - Test

Physics test 3 -[Form IV] 

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1 ...... is a sensing element of a Geiger Counter instrument that can detect a single radiation particle

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C. Geiger Muller Tube - CORRECT!

A. Spark Counter

B. Gold leaf Electroscope

C. Geiger Muller Tube

D. Wilson Cloud Chamber

2. It Allows the radiations to enter the tube .......

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A. Entrance window - CORRECT!

A. Entrance Window

B. Hollow Tube

C. Collector Wire

D. Speaker Or Scalar

3. It detects the radiation by forming sparks on the dry air ..........

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C. Spark Counter - CORRECT!

A. Wilson Cloud Chamber/p>

B. Bubbles Chamber

C. Spark Counter

D. photographic Film

4. The time required for half of the original sample to decay...

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B. Half-Life - CORRECT!

A. Half Time

B. Half-Life

C. Time

D. None of the Above

5. how does number of half lives can be obtained ?

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C. t/t_1/2 - CORRECT!

A. n X t_1/2

B. N_n/N₀

C. t/t_1/2

D. N/N₀

6. a sample of a radioactive element contains 120 nuclei.calculate the namber of half lives it takes for the sample to decay so that there are only 15 nuclei left undecayed

A. 3 - CORRECT!

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A. 3

B. 2

C. 6

D. 10

7. a sample contains 800g of iodine - 131.how much of the sample will remain undecayed after 40 days ?(half life of iodine -131 is 8 days)

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C. 25 - CORRECT!

A.20

B. 30

C. 25

D. 40

8. the half-life of iodine - 131 is 8 days. a sample 16g of iodine - 131.determine the remaining mass of the sample after ddecayed for 24 days.

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D. 2g - CORRECT!

A. 14g

B. 8g

C. 7g

D. 2g

9....... occurs when a previously stable material has been made radioactive by exposure to specific radiation

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C. Artificial Radioactivity - CORRECT!

A. Natural Radioactivity

B. Radioactive decay

C. Artificial Radioactivity

Nuclear Decay

10...... is a nuclear reaction in which two or more atomic nuclei come very close and join to form a new type of atomic nucleus

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A. Nuclear Fusion - CORRECT!

A. Nuclear Fusion

B. Nuclear Fission

C. Nuclear Bombardment

D. Nucleons

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