Improvement in Food Resources — Science STD 9 — Question

The SI unit of force is:

Starfish belongs to phylum:

1. Mollura.
2. Coelenterata.
3. Arthropoda.
4. Echinodermata.

The process of cross breeding two different varieties of crop plants each having a desire characteristic, is known as:

1. Selection
2. Hybridization
3. Crossing
4. Introduction

The temperature remains constant during melting and all the ice changes into water. The enthalpy change associated with this process is due to _____________?

Bone matrix is rich in:

Neon and chlorine have atomic numbers 10 and 17 respectively. Their valencies will be ______ and ______ respectively:

What is the atomic mass (u) of chlorine:

A 20kg gun fires a bullet of mass 20g with a city of 400m/ s. The action on the shoulder of the person per second by the gun is:

Water falls from a height of 60m at the rate of 15kg is  operate a turbine. The soosses due to frictional forces are 10% of energy. How much power is generated by the turbine? (Take, g = 10m/ s²)

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.