Matter in Our Surroundings — Science STD 9 — Question

Which of these options are not a function of ribosomes?

1. It helps in manufacture of protein molecules.
2. It helps in manufacture of enzymes.
3. In helps in manufacture of hormones.
4. In helps in manufacture of starch molecules.

The material which is added to water during purification process at the water works so as to disinfect it is:

1. Potassium permanganate.
2. Betadine.
3. Chlorine.
4. Potash alum.

Which of the following is not a property of a molecule?

1. y = constant: Uniform motion
2. a = constant: __________

A rigid body of mass m kg is lifted uniformly by a man to a height of one metre in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done on the body against gravitation in both the cases are in ratio:

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of:

A stone rubbed on a rough floor and placed on the skin will show heating sensation, because:

In the formation of iron sulphide, by heating iron and sulphur, the mass of iron(II) sulphide __________ when compared with a total mass of iron and sulphur:

Contractile vacuoles take part in:

Nuclides having the same difference in mass number and atomic number, are known as