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Physics Questions and Answers

Md. Saifur Rahman

What is Motion?

When a body is continuously changing its position with respect to the surroundings, then we say that the body is in motion.

What is speed?

The quantity by which we can measure how fast a body moves or distance traveled, is called speed.

What is a scalar quantity?

Physical quantities which can be fully expressed by a magnitude only are called scalar quantities. Length, mass, speed, work, energy, time, temperature, etc. are examples of scalar quantities.

What is a vector quantity?

Physical quantities which need both magnitude and direction to be fully expressed are called vector quantities. Displacement, velocity, acceleration, force, electric intensity, etc. are examples of a vector quantity.

What is negative acceleration or retardation?

The rate of decrease of velocity of a body with time is called negative acceleration or retardation.

Chemistry

Secondary Chemistry

Chapter - 1 : Concept of Chemistry

Chapter - 2 : States of Matter

Chapter - 3 : Structure of Matter

Chapter - 4 : Periodic Table

Chapter - 5 : Chemical Bond

Chapter - 6 : Concept of Mole and Chemical Counting

Chapter - 7 : Chemical Reactions

Chapter - 8 : Chemistry and Energy

Chapter - 9 : Acid - Base Balance

Chapter - 10 : Mineral Resources: Metal - Nonmetal

Chapter - 11 : Mineral Resources: Fossils

Chapter - 12 : Chemistry in Our Lives

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