Matter in Our Surroundings — Science STD 9 — Question

Which of the following is not an element?

1. Graphite.
2. Germaniumcc.
3. Silica.
4. Silicon.

________ is the characteristic of a musical sound by a which a loud sound can be distinguished from a faint sound even though both have the same pitch:

Which one of the following species of honey bee is an Italian species?

1. Apis Mellifera.
2. Apis Dorsata.
3. Apis florae.
4. Apis Cerana Indica.

Who has stated the Right hand Thumb Rule?

A water tanker filled up to two-thirds of its tank with water is running with a uniform speed. When the brakes are suddenly applied, the water in its tank would:

1. Move backward.
2. Move forward.
3. Rise upwards.
4. Remain unaffected.

Rinku and Pinku had half day schools during summer. They used to go to school by autorickshaw. They observed that the auto driver covered the top of the vehicle by some mats and sprinkled water on them regularly, which keeps it cool. Which of the following phenomena is involved here:

Which of the following in natural insecticides?

1. Nicotine
2. Neem
3. Pyrethrum
4. All of these

Water molecules move from their ______ concentration to their ______ concentration during osmosis:

The efferent part of neqron is:

The gravitational force between two bodies is