The Fundamental Unit of Life — Science STD 9 — Question

Which of the following correctly represents 360g water?

1. 2 moles of H₂O.
2. 20 moles 0f water.
3. 6.022 × 10²³ molecules of water.
4. 1.2044 × 10²⁵ molecules of water.

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

Three spheres have radii 1cm, 2cm and 3cm, respectively. Which sphere exerts maximum pressure on earth?

Kranti, Pusa Agrani and pusa bold are improved varieties of:

Harelip is a:

1. Acquired disease.
2. Infectious disease.
3. Metabolic disease.
4. Congenital disease.

Gases are liquefied under ______?

Protein storing plastid is:

1. Aleuroplast
2. Amyloplast
3. Elaioplast
4. Both b and c

Arrange the Hydrogen, Carbon, Sulphur and in increasing order of their mass.

A microphone converts:

1. Electrical energy into sound energy in ordinary telephone.
2. Microwave energy into sound energy in a mobile phone.
3. Sound energy into mechanical energy in a stereo system.
4. Sound energy into electrical energy in public address system.

Epithelial tissue always has an exposed outer surface and an inner surface anchored to connective tissue by a thin, non-cellular structure called the:

1. Nonstratified layer.
2. Stratified membrane.
3. Basement membrane.
4. Fibroblast.