1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Regular use of which of the following fertilizer increases the acidity of soil?
A
Potassium nitrate
B
Urea
C
Superphosphate of lime
D
Ammonium sulphate
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 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
4
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Consider the reaction, 2A + B $$\to$$ products. When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is
A
L mol-1 s-1
B
no unit
C
mol L-1 s-1
D
s-1
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