Atoms and Molecules — Science STD 9 — Question

Physical quantity corresponding to the rate of change of displacement is:

The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method?

Energy can neither be created nor be destroyed, but it can be changed from one form to another. This law is known as:

Branched involuntary muscle fibres are found in:

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

The strength of magnetic field inside a long current carrying straight solenoid is:

Which of the following is a mismatch?

1. Leprosy- bacterial infection.
2. AIDS- bacterial infection.
3. Malaria- protozoan infection.
4. Elephantiasis- nematode infection.

Tissue found in area of regular wear and tear is:

Membrane which allows passage of only solvent through it is:

1. Differentially permeable.
2. Semipermeable.
3. Impermeable.
4. Both (a) and (b).

Potential energy increases: