1
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
Consider, the radioactive disintegration

$${}_{82}{A^{210}}\buildrel {} \over \longrightarrow B\buildrel {} \over \longrightarrow C\buildrel {} \over \longrightarrow {}_{82}{A^{206}}$$

The sequence of emission can be
A
$$\beta$$, $$\beta$$, $$\beta$$
B
$$\alpha$$, $$\alpha$$, $$\beta$$
C
$$\beta$$, $$\beta$$, $$\gamma$$
D
$$\beta$$, $$\beta$$, $$\alpha$$
2
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
Which atomic species cannot be used as a nuclear fuel?
A
$$_{92}^{233}$$U
B
$$_{92}^{235}$$ U
C
$$_{94}^{239}$$Pu
D
$$_{92}^{238}$$U
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The half-life of C14 is 5760 years. For a 200 mg sample of C14, the time taken to change to 25 mg is
A
11520 years
B
23040 years
C
5760 years
D
17280 years
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The nucleus $$_{29}^{64}$$Cu accepts an orbital electron to yield,
A
$$_{28}^{65}$$Ni
B
$$_{30}^{64}$$Zn
C
$$_{28}^{64}$$Ni
D
$$_{30}^{65}$$Zn
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