1
KCET 2019
MCQ (Single Correct Answer)
+1
-0

The end product of decay of $${ }_{90} \mathrm{Th}^{232}$$ is $${ }_{82} \mathrm{~Pb}^{208}$$. The number of $$\alpha$$ and $$\beta$$ particles emitted are respectively

A
$$3,3$$
B
$$6,4$$
C
$$6,0$$
D
$$4,6$$
2
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The energy equivalent to a substance of mass 1 g is
A
$18 \times 10^{13} \mathrm{~J}$
B
$9 \times 10^{13} \mathrm{~J}$
C
$18 \times 10^6 \mathrm{~J}$
D
$9 \times 10^6 \mathrm{~J}$
3
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The half-life of tritium is 12.5 years. What mass of tritium of initial mass 64 mg will remain undecayed after 50 years?
A
32 mg
B
8 mg
C
16 mg
D
4 mg
4
KCET 2018
MCQ (Single Correct Answer)
+1
-0
The total energy of an electron revolving in the second orbit of hydrogen atom is
A
-13.6 eV
B
-1.51 eV
C
-3.4 eV
D
zero
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