Matter in Our Surroundings — Science STD 9 — Question

Echoes are caused by the ______ of sound.

When a stationary car starts suddenly, the passengers are jerked __________. (Forward, Backward, Sideways)

Angular speed of the second hand of a clock is __________ radian per second. (π/30, 2π, 0.03)

Growing different crops on a piece of land in a pre-planned succession is known as __________. (Crop Rotation, Inter Cropping, Intensive Farming)

Immiscibl liquids are separated by using a __________.

The state of matter called ________ makes a fluorescent tube (or neon sign bulb) glow. (Plasma, Gas, Liquid)

Planting soyabean and maize in alternate rows in the same field is called __________. (Mixed cropping, Inter cropping, Crop rotation)

Lining of blood vessels is made up of _________. (Squamous epithelial tissue, Columnar epithelial tissue, Cuboidal epithelial tissue)

Momentum is a _______ quantity. Its unit is ________.