Gravitation — Science STD 9 — Question

For good absorption of sound in auditorium, it requires:

Which of the following are also considered to be the states of matter?

1. Plasma.
2. Platelets.
3. BFC.
4. BHC.

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (ii) and (iv)

A group of similar freely inter-breeding organisms constitutes a:

1. Species.
2. Genera.
3. Family.
4. Class.

Permanent tissues differ from meristematic tissue in:

1. Inability to divide.
2. Attainment of definite shape and size.
3. Performing a distinct function.
4. All the above.

The rockets work on the principle of conservation of:

1. Mass.
2. Energy.
3. Momentum.
4. Velocity.

Lignified elongated dead cells are:

1. Parenchyma.
2. Collenchymas.
3. Sclerenchyma.
4. None of the above.

Alpha-particles that come closer to nuclei in Rutherford's alpha particle scattering experiment:

Symbol of ______ is taken from Greek word Kalium.

Protons and neutrons clump together to form the __________ of an atom.

Which of the following has the highest n/p ratio: