Matric Part 1/9th Class Physics Chapter 1 Long Question With Answer for Unit 1 Physical Quantities and Measurement

Question # 1

Define Physical quantities. Also write its types.

Ans 1: Physical Quantities: All measurable quantities are called physical quantities such temperature. A physical quantity possesses at least two characteristics in common. One is its numerical magnitude and the other is the unit in which it is measured. Example: If the length of a student is 104 cm then 104 is its numerical magnitude and centimeter is the unit of measurement. Types of Physical Quantities: Physical quantities are divided into base quantities and derived quantities 1- Base Quantities: There are seven physical quantities which form the foundation for other physical quantities, These physical quantities are called the base quantities. These are length, mass, time, electric current. Temperature, intensity of light and the amount of a substance. 2- Derived Quantities: Those physical quantities which are expressed in terms of base quantities are called the derived quantities. These include area, volume. speed, force, work, electric charge, electric potential etc.

Question # 2

A Chocolate wrapper is 6.7 cm long and 5.4cm wide. Calculate its area upto reasonable number of significant figures.

Ans 1: Given Data: Length = 6.7cm Width = 5.4cm Area = ? Solution: Area = length x width putting the values = 6.7 x 5.4 = 36.18cm² = 36.2 cm²

Question # 3

Define physics and explain its branches.

Ans 1: Physics: Physics is a branch of science that deals with matter, energy and their relationship. Branches of Physics: Following ate branches of physics: 1- Machanics: It is the study of motion of objects, its causes and effects. 2- Heat: It deals with the nature of heat , modes of transfer and effects of heat 3- Sound: It deals with the physical aspects of sound waves , their production, properties and applications. 4- Light : It is the study of the physical aspects of light, its properties, working and use of optical instruments. 5- Electricity and Magnetism: It is the study of the charges at rest and in motion their effects and their relationship with magnetism. 6- Atomic Physics: it is the study of the structure and properties of atom 7- Nuclear Physics: It deals with the properties and behavior of nuclei and the particle within the nuclei: 8- Plasma Physics: It is the study of production, properties of the ionic state of matter 9- GeoPhysics It is the study of the internal structure of the Earth.

Question # 4

Write a note on Waves as carriers of Energy?

Ans 1: Waves as carriers of Energy: Energy can be transferred from one place to another through waves. Example: When we shake the stretched string up and down, we provide our muscular energy to the string. As a result, a set of wave can be seen travelling across the string. The vibrating force from the hand disturbs the particles of string and sets them in motion. These particles then transfer their energy to the adjacent particles in the string. Energy is thus transferred from one place of the medium to other. Dependence: The amount of energy carried by the wave depends on the distance of the stretched string from its rest position. That is the energy in a wave depends on the wave amplitude of wave. If amplitude and frequency are greater than more energy will be transfer. Example: If we shake the string faster, we give more energy per second to produce wave of higher frequency, and wave delivers more energy per second to the particles of the string as it moves forward. Energy. Transfer in Water: Water waves also transfer energy from one place to another. Example: If we drop a stone into pond of water. Water waves will be produce on the surface of water and will travel outward. Now if we place a cork at some distance from the falling stone. When waves reacts the cork, it will move up and down along with the motion of the water particles by getting energy from the wave. This shows that water waves like other waves transfer energy from one place to another without transferring in matter.

Question # 5

Explain the construction and use of meter rule and measuring tape.

Ans 1: Meter Rule: meter rule is a length measuring instrument and is commonly used in laboratories to measure length of an object or distance between two points
Ans 2: Construction: it is one meter long which is equal to 100 com. Each centimeter is divided into 10 small divisions called millimeter (mm). Thus one millimeter is the smallest reading on metre rule..
Ans 3: Least Count: Smallest measurement that can be taken by an instrument is called least count of that instrument. one millimeter is the smallest reading that can be taken using a meter rule so least count of meter rule is 1 mm
Ans 4: Precaution: while measuring length or distance eye must b e kept vertically above the reading point. The reading become doubtful if eye is positioned either left or right to reading point
Ans 5: Measuring tape: its s a length measuring s instrument which is used t o measure length in meter and centimeters. A measuring tape used by black smith and carpenters.
Construction: A measuring tape consists of a thin and long strip of cotton. metal or plastic generally 10m, 20, 50, or 100 m long. we can measure the length in centimeters as well as in inches by measuring tape.

Question # 6

Write a note on Ripple Tank?

Ans 1:

Question # 7

write a note on stopwatch and its types

Ans 1: Definition: A stopwatch is used to measure the time interval of an event
Types of stop watch: There are two types of stopwatches:
mechanical stopwatch, Digital stopwatch
Ans 2: Mechanical stopwatch: A mechanical stopwatch can measure a time interval up to a minimum 0.1 second. It contains a knob that is used to wind the spring that powers the watch. It i also used as start stop and reset button. When the knob pressed once the watch start. When the button is pressed second time, the watch stops. When the button is pressed third time, the needle comes back to zero position
Ans 3: Digital stopwatch: digital stopwatch commonly used in laboratories can measure a time interval as small as 1/100 seconds or 0.01 second. The digital stopwatch starts to indicate the time lapsed as the start stop button is pressed. As soon as start stop button pressed again, it stops and indicates the time interval noted by it between start and stop of an event. A reset button restore its initial zero setting

Question # 8

What is measuring cylinder. Explain it

Ans 1: Measuring cylinder: A measuring cylinder is a graduated glass cylinder used to measure the volume of liquid and also to fine the volume of an irregular shaped solid object
Ans 2: Construction; It is a glass or transparent plastic cylinder. it has a scale along its length that indicates the volume in milliliter. Measuring cylinders have different capacities from 100ml to 2500ml
use: it is used to measure volume of liquid or powdered substance. It is also used to dine volume of irregular shaped solid insoluble in liquid by displacement method
Ans 3: How to use measuring cylinder: Take a measuring cylinder, place it vertically on table. pour some water into it .Note that the surface of water will be curved. Meniscus of most liquids curves downward while meniscus of mercury curves upward. Correct method to note level of liquid in cylinder is to keep eye at same level as the meniscus of liquid. It is incorrect to keep eye above or below the liquid level.
When eye is above liquid level meniscus appears higher on scale. When eye is below liquid level, the meniscus appears lower than actual height of liquid.

Question # 9

Write note on significant figure

Ans 1: Significant figure: All the accurately known digits and the first doubtful digit in as expression are called significant figures. It reflects the precision of measure value of a physical quantity
Explanation: The value of a physical quantity is expressed by a number, along with suitable units. The accuracy in the measurement of a physical quantity depends upon
The quality of the measuring instrument
The skills of the observer
The number of observation made
The improvement in the quality of measurement can be made by using better measuring instrument, the more is value of precision more significant figure means greater precision
Ans 2: Rules of significant figure: The follow rules are helpful in identifying significant figure
Non zero digits are always significant
Zeros between two significant figures are also significant
Final or ending zeros on the right in decimal fraction are significant
Zeros written on the left side of the decimal point for the purpose of spacing the decimal point are not significant
In whole number s that end in one or more zeros without a decimal point these zeros may or may not be significant. In such case, express the quantity using scientific notation to find the significant zeros

Question # 10

Define physics and explain its branches

Ans 1: Physics: the branch of science which deals with the study of matter, energy and their mututal relationship is called physics

Branches of physics
Mechanics: The branch of physics which deals with the study of matter, energy and their mutual relationship is called physics
Ans 2: Heat: The branch of physics which deals with the nature of heat, modes of transfer and effects of heat is called heat

Sound: The branch of physics which deals with the study of physical aspects of sound wave, their production, properties and applications is called sound
Ans 3: Light: The branch of physics which deals with the study of physical aspects of lights ,its properties, working and use o optical instruments is called light

Electricity and magnetism: The branch of physics which deals with the study of charges at rest and in motion, their effects and their relationship with magnetism is called electricity and magnetism
Ans 4: Atomic physics: The branch of physics which deals with the study of structure and properties of atoms is called atomic physics

Nuclear physics: The branch of physics which deals with the study of properties and behavior of nuclei and their particles within nuclei is called nuclear physics
Ans 5: plasma: physics : The branch of physics which deals with the study of production, properties of ionic state of matter the fourth state of matter , is called plasma physics .

Geo physics: The branch of physics which deals with the study of internal structure of the earth is called geophysics

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Matric Part 1/9th Class Physics Chapter 1 Long Question With Answer for Unit 1 Physical Quantities and Measurement

9th Class English Medium Subjects

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Online Long Questions For Chapter 1 "9th Class Physics Chapter 1 Long Question Preparation "

Physics (New Book) - 9th Class Physics Chapter 1 Long Question Preparation

Define Physical quantities. Also write its types.

A Chocolate wrapper is 6.7 cm long and 5.4cm wide. Calculate its area upto reasonable number of significant figures.

Define physics and explain its branches.

Write a note on Waves as carriers of Energy?

Explain the construction and use of meter rule and measuring tape.

Write a note on Ripple Tank?

write a note on stopwatch and its types

What is measuring cylinder. Explain it

Write note on significant figure

Define physics and explain its branches

Prepare Complete Set Wise Questions For Chapter 1 "9th Class Physics Chapter 1 Long Question Preparation "

Set 1

Set 2

9th Class Physics Chapter 1 Long Question Preparation - Set 1

Define Physical quantities. Also write its types.

A Chocolate wrapper is 6.7 cm long and 5.4cm wide. Calculate its area upto reasonable number of significant figures.

Define physics and explain its branches.

Write a note on Waves as carriers of Energy?

Explain the construction and use of meter rule and measuring tape.

Write a note on Ripple Tank?

write a note on stopwatch and its types

What is measuring cylinder. Explain it

Write note on significant figure

Define physics and explain its branches

9th Class Physics Chapter 1 Long Question Preparation - Set 2

A Chocolate wrapper is 6.7 cm long and 5.4cm wide. Calculate its area upto reasonable number of significant figures.

What is screw gauge. How a screw gauge is used to measure diameter of thin wire

Write note on significant figure

Define physical quantities and explain its types

What is meant by Vernier callipers? Write its construction.

write a note on stopwatch and its types

What is measuring cylinder. Explain it

Explain the construction and use of meter rule and measuring tape.

Define Physical quantities. Also write its types.

What is the importance of physics in our daily life

9th class Physics Chapter 1 Long Q's (English Medium)

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