Science and Tech SA2 Portions

The SI unit of length is:

• Centimeter

• Meter

• Kilometer

• Millimeter

A scientist measures the time taken by a pendulum to complete one oscillation. The most suitable instrument for this is:

• Thermometer

• Vernier Calipers

• Stopwatch

• Measuring Tape

The accuracy of a measurement depends on:

• The least count of the instrument

• The observer’s skill

• The size of the object

• The environment

When iron reacts with copper sulfate solution, the color of the solution changes due to:

• Formation of rust

• Formation of iron sulfate

• Liberation of hydrogen gas

• Evaporation of water

A balanced chemical equation obeys:

• The law of definite proportions

• The law of conservation of mass

• The law of multiple proportions

• The ideal gas law

The process of passing electricity through water to produce hydrogen and oxygen gas is called:

• Electrolysis

• Sublimation

• Neutralization

• Oxidation

The fundamental particle that does not carry any charge is:

• Proton

• Neutron

• Electron

• Positron

The atomic number of an element represents:

• Number of neutrons

• Number of protons

• Sum of protons and neutrons

• Number of electrons in the outermost shell

The isotope of hydrogen that contains two neutrons is:

• Protium

• Deuterium

• Tritium

• None of these

The periodic table is arranged in order of increasing:

• Atomic mass

• Atomic number

• Number of neutrons

• Electronegativity