1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?
A
1000 days
B
300 days
C
10 days
D
100 days
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Which of the following nuclear reactions will generate an isotope?
A
neutron particle emission
B
positron emission
C
$$\alpha$$-particle emission
D
$$\beta$$-particle emission
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will
A
remain unchanged
B
triple
C
increase by a factor of 4
D
double
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
In the transformation of $${}_{92}^{238}U$$ to $${}_{92}^{234}U$$, if one emission is an α-particle, what should be the other emission(s)?
A
Two $$\beta^-$$
B
Two $$\beta^-$$ and one $$\beta^+$$
C
One $$\beta^-$$ and one $$\gamma$$
D
One $$\beta^+$$ and One $$\beta^-$$
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