Ncert 9th

What are the five basic elements according to early Indian philosophers?

• Air, earth, fire, sky, and water

• Air, earth, fire, sky, and metal

• Air, earth, fire, sky, and wood

• Air, earth, fire, sky, and stone

What is the SI unit of mass?

• Kilogram (kg)

• Gram (g)

• Pound (lb)

• Ounce (oz)

What is the SI unit of volume?

• Cubic meter (m³)

• Liter (L)

• Milliliter (mL)

• Gallon (gal)

What happens to salt when it is dissolved in water according to the text?

• It spreads throughout the water

• It sinks to the bottom

• It floats on the surface

• It evaporates

What did ancient Greek philosophers classify matter into?

• Five basic elements

• Four basic elements

• Three basic elements

• Six basic elements

What does the experiment with potassium permanganate demonstrate about the particles of matter?

• Particles of matter are very large.

• Particles of matter are continuously moving.

• Particles of matter are very small.

• Particles of matter do not dissolve in water.

What happens when you put an unlit incense stick in a corner of your class?

• You can smell it immediately.

• You cannot smell it until it is lit.

• It changes color.

• It dissolves in the air.

What is observed when a drop of ink is added to water in a beaker?

• The ink immediately settles at the bottom.

• The ink spreads slowly throughout the water.

• The ink evaporates.

• The ink forms a solid mass.

What conclusion can be drawn from the activities involving the movement of particles in different substances?

• Particles of matter are stationary.

• Particles of matter are continuously moving.

• Particles of matter are very large.

• Particles of matter do not interact with each other.

What does the experiment with Dettol demonstrate about the particles of matter?

• Particles of matter are very large.

• Particles of matter are continuously moving.

• Particles of matter are very small.

• Particles of matter do not dissolve in water.