Improvement in Food Resources — Science STD 9 — Question

Phloem in the plant perform the function of _________.

A passenger in a moving train tosses a coin which falls behind him. This shows that the motion of train is:

1. Accelerated.
2. Uniform.
3. Retarded.
4. Along circular track.

Plasma content of blood is:

1. 35%
2. 55%
3. 65%
4. 80%

The history of the cell began in 1665 with the publication of Micrographia in London by:

1. Robert Hooke
2. Robert Brown
3. Straburger
4. Dujardin

The boiling point of diethylether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following represents their boiling points in kelvin scale?

Which of the following statement is correct about the atom of and element?

1. An atom can have only protons and neutrons but no electrons.
2. An atom can have only electrons ad neutrons but no protons.
3. An atom can have only electron and proton but o neutron.
4. an atom must always have a proton, neutron and electron.

Which crop is grown between two cereal crops in crop rotation?

The device which converts mechanical energy into energy which runs our microwave oven is:

1. Electric motor.
2. Alternator.
3. Turbine.
4. Electric heater.

The total force exerted by a body normal to the surface is called:

An electric motor raises a load of 0.2kg, at a constant speed, through a vertical distance of 3.0m in 2s. If the acceleration power stations and thermal power stations, alternators produce electricity.