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1
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

A nuclide at rest emits an $\alpha$-particle. In this process

A
$$\alpha$$-particle moves with large velocity and the nucleus remains at rest.
B
Both $$\alpha$$-particle and nucleus move with equal speed in opposite directions.
C
Both move in opposite directions except $$\alpha$$-particle with greater speed.
D
Both move in opposite direction with greater velocity of $$\alpha$$-particle.
2
VITEEE 2022
MCQ (Single Correct Answer)
+1
-0

The half-life period of a radioactive element $$x$$ is same as the mean life time of another radioactive element $$y$$. Initially, both of them have the same number of atoms. Then,

A
$$x$$ and $$y$$ have the same decay rate initially
B
$$x$$ and $$y$$ decay at the same rate always
C
$$y$$ will decay at a faster rate than $$x$$
D
$$x$$ will decay at a faster rate than $$y$$
3
VITEEE 2021
MCQ (Single Correct Answer)
+1
-0

Polonium has a half-life of 140 days. If we take $$20 \mathrm{~g}$$ of polonium initially then the amount of it that remains after 280 days is

A
2.5 g
B
5 g
C
10 g
D
15 g
4
VITEEE 2021
MCQ (Single Correct Answer)
+1
-0

According to Bohr model of hydrogen atom, only those orbits are permissible which satisfy the condition

A
$$m v=n h$$
B
$$\frac{m v^2}{r}=n\left(\frac{h}{2 \pi}\right)$$
C
$$m v r=n\left(\frac{h}{2 \pi}\right)$$
D
$$m v r^2=n\left(\frac{h}{2 \pi}\right)$$
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