Tissues — Science STD 9 — Question

Which one of the following scrap metal cannot be separated by magnetic separation?

When we talk of a force acting on a body, it usually means:

1. Electrical force.
2. Balanced force.
3. Unbalanced force.
4. Nuclear force.

If the number of electrons in an ion Z^3- is 10, the atomic number of element Z will be:

As the fall of the object continues, the potential energy would ________ while the kinetic energy would ______:

In a meeting hall which is initially half-filled with participants, and after some time becomes full in capacity, then the clarity of speech:

Which of the following is NOT a characteristic of longitudinal wave?

Choanocytes are unique to:

1. Protozoa.
2. Porifera.
3. Mollusca.
4. Echinodermata.

The element which is required in largest quantity by plants is:

When a car driver travelling at a speed of 10m/s applies brakes and brings the car to rest in 20s, then retardation will be:

1. +2m/s²
2. -2m/s²
3. -0.5m/s²
4. +0.5m/s²

Which kind of sound is produced in an earthquake before the main shock wave begins?

1. Ultrasound.
2. Infrasound.
3. Audible sound.
4. None of the above.