Improvement in Food Resources — Science STD 9 — Question

A student draws a distance-time graph for a moving scooter and finds that a section of the graph is a horizontal line parallel to the time axis. Which of the following conclusion is correct about this section of the graph?

1. The scooter has uniform speed in this section.
2. The distance travelled by scooter is the maximum in this section.
3. The distance travelled by the scooter is the minimum in this section.
4. The distance travelled by the scooter is zero in this section.

Evaporation is a _______ phenomenon.

Evaporation occurs at _______ temperature.

Identify the action involved when a magnet attracts a piece of iron towards it.

Soil erosion is caused due to:

1. Strong wind.
2. Heavy rains.
3. Keeping the fields fallow for a long.
4. All of these.

Identify the organelle present only in animal cells:

Which of the quantities, speed or velocity gives the direction of motion of body:

The universal law of gravitation was postulated by:

The capacity of a body to do work is called ______:

A girl is carrying a school bag of 3kg mass on her back and moves 200m on a levelled road. If the value of g be 10m/s², the work done by the girl against the gravitational force will be:

1. 6000J
2. 0.6J
3. 0J
4. 6J