Improvement in Food Resources — Science STD 9 — Question

In which of three media; air, water and steel, does sound travel the fastest?

Rahul is playing the drums. Then which of the following characteristics of sound would result in increase in loudness?

In which direction does a car at rest move when pushed by a few persons:

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:

Which of the following has the smallest number of molecules?

The slope of a speed-time graph gives:

1. Distance travelled.
2. Velocity.
3. Acceleration.
4. Displacement.

The covering tissue of external and internal surfaces of animals is:

1. Connective
2. Muscular
3. Nervous
4. Epithelial

The wave number of a wave of wavelength 10m is:

Unit used in selling electrical energy to consumer is:

For an element with atomic number 19, the 19th electron will occupy: