Atoms and Molecules — Science STD 9 — Question

Different isotopes are matched with their uses as

1. Co - 60 - To treat cancer.
2. U - 238-To produce electricity.
3. I - 131 - To treat goitre.
4. Na-24-In agricultural research.

Options:

While designing an auditorium, an engineer uses which of the following points?
A: Makes concave back stage:
B: Uses sound absorbing materials.
C: Reduces reverberation time.
D: Increases echo.

The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

The ratio of speed to the magnitude of velocity when the body is moving in one direction is:

Rutherford’s alpha particle scattering experiment led to the discovery of:

Which of the following energy is absorbed during the change of state of a substance?

Water purified by the process of evaporation and condensation can contain:

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

Which of the following is micronutrient?

Where do we generally mount the material on the slide?