The Fundamental Unit of Life — Science STD 9 — Question

When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:

The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called:

Which of the following situations involves the Newton's second law of motion?

1. A force can stop a lighter vehicle as well as a heavier vehicle which are moving.
2. A force can accelerate a lighter vehicle more easily than a heavier vehicle which are moving.
3. A force exerted by a lighter vehicle on collision with a heavier vehicle results in both the vehicles cor to a standstill.
4. A force exerted by the escaping air from a balloon in the downward direction makes the balloon to go upwards.

In SONAR we use:

1. Ultrasonic waves.
2. Infrasonic waves.
3. Radio waves.
4. Audible sound waves.

A force cannot be seen but the effect of force can be felt:

Natural system of classification employs:

1. Compleify of cell structure.
2. Complexity of body structure.
3. Organisation.
4. All the above.

Rotation of leguminous crop with wheat or maize is an example of _________:

Consider a ball at rest in the middle of a toy wagon. When the wagon is pulled forward, the ball:

The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is:

1. Carbon dioxide.
2. Hydrochloric acid.
3. Hydrogen sulphide.
4. Carbon disulphide.