set 1 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Celsius - Unit of Temperature.

Some more examples,

Answer: (d)

Answer: (b)

Acceleration is the correct answer.

Acceleration Definition:

the act or process of moving faster or happening more quickly: the act or process of accelerating or ability to accelerate

• It is the time rate of change of velocity of a body.
• It is a vector quantity.
• Its SI unit is m/s².

The correct explanation for the problem:

When the coin toss, it also has the same velocity as the velocity of the train but during the time, the coin is in the air, the velocity of the train keeps on increasing, and hence it falls behind the passenger.

Definition for other options,

Speed :

Speed is defined as the rate of change of position of an object in any direction. It is measured as the ratio of distance to the time in which the distance was covered. It is a scalar quantity as it has only direction and no magnitude

Deceleration :

A decrease in speed as the body moves away from the starting point is defined as Deceleration. Deceleration is the opposite of acceleration. Deceleration also is known as negative acceleration.

Velocity :

Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time. Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Answer: (a)

Answer: (b)

Fundamental unit:

The SI unit of a fundamental quantity is called a fundamental unit.

There are 7 fundamental quantities and their fundamental units.
The fundamental quantities are Length, Mass, Time, Electric Current, Thermodynamic Temperature, Luminous Intensity, etc.
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Also know,

Fundamental Quantity:

An independent physical quantity that cannot be expressed in terms of other physical quantities is called fundamental quantity.
They are conventionally chosen. It is used as a base to get other derived quantities by combining them.

Supplementary units:

The units that are used along with base units to form derived units in the International System are called supplementary units.

Explanation for the question:

meter (m), kilogram (Kg) and second (s) are the fundamental units of fundamental quantities Length, Mass and Time respectively.

Where Newton (N) is a Derived Quantities.

Answer: (a)

Since displacement is always less than or equal to distance but never greater than distance.

Hence, the numerical ratio of displacement to the distance covered is always equal to or less than one.