The Fundamental Unit of Life — Science STD 9 — Question

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

50. Which of the following can sometimes be 'zero' for a moving body?

1. Average velocity.
2. Distance travelled.
3. Average speed.
4. Displacement.

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

Weight is:

Tapeworm is member of phylum:

1. Annelida.
2. Porifera.
3. Nematoda.
4. Platyhelminthes.

A force of 50N is applied on a nail of area 0.001 cm².Then the thrust applied is:

Earth goes round the SUN with:

The mass of moon is about 0.012 times that of the earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

The most common type of ground tissue is:

1. Epidermis.
2. Collenchymas.
3. Sclerenchyma.
4. Parenchyma.

When we change sound to loud sound we increase its:

When a rubber balloon held between the hands is pressed, its shape changes. This happens because:

1. Balanced forces act on the balloon.
2. Unbalanced forces act on the balloon.
3. Frictional forces act on the balloon.
4. Gravitational forces act on the balloon.