Matter in Our Surroundings — Science STD 9 — Question

The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?

Two objects of different masses falling freely near the surface of moon would:

1. Have same velocities at any instant.
2. Have different accelerations.
3. Experience forces of same magnitude.
4. Undergo a change in their inertia.

What property of an element determines its chemical behaviour?

Sound travels in air:

In water, the proportion of oxygen and hydrogen by mass is:

Which of these would support the idea that mass is conserved in a reaction that produces gas as a product:

Which term can be used for the number of protons present in an atom?

Which one is an oil yielding plant among the following?

1. Lentil
2. Sunflower
3. Cauliflower
4. Hibiscus

Nervous tissue is not found in:

Waves inside a gas are: