Gravitation — Science STD 9 — Question

The ultrasound waves can penetrate into matter to a large extent because they have:

The best way to recover sugar form an aqueous sugar solution is:

Identify the food source that yields carbohydrates:

Rahul is playing the drums. Then which of the following characteristics of sound would result in increase in loudness?

Osmosis is the diffusion of:

Sound travels in air:

Biological weathering is caused by:

Speed of a body depends on:

Irrigation ensures that the crops get water whenever they need it during growing season. Tube wells are surface water source of irrigation. They get water from porous soil strata. Canal system of irrigation draws water from rivers and is also related to generation of hydroelectricity. River lift system is advantageous in those areas where river water is easily available. Both canals and river lifts are groundwater sources of irrigation.
Select the correct option regarding this.