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

Question # 1

Your hair grow at the rate of 1mm per day . Find their growth rate in nms^-1

Ans 1: Solution: Rate of growth = 1mm per day =1mm/day =1x10^-3m/24x60x60s = 0.0000000115ms^-1 = 11.57 x10^-9 ms^-1 = 11.57 nms^-1

Question # 2

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 # 3

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 # 4

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 # 5

What is the importance of physics in our daily life

Ans 1: Law and principle of physics help us to understand nature
The rapid progress in science during the recent years has become possible due to discoveries and inventions in the field of physics. The technologies are the applications of scientific principles. Most of the technologies of our modern society throughout the world are related to physics. For example, car is made on the principles of mechanics and a refrigerator is based on principles of thermodynamics. In or daily lifer there are lots of applications of physics . For example in electrical appliances (air conditioners, washing machine),means of transport( cars, aero-planes ), means of communication (radio, T.V, Telephone) etc

Question # 6

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 # 7

Define science and describe how science was divided into various branches

Ans 1: Science :The knowledge gained through observations and experiments is called science .The wor science is derived from the Latin word "scientia", which means knowledge. Science was divided into various branches initially as described below;
Ans 2: Natural Philosophy: Not until eighteen century is known as natural philosophy. Later on as knowledge increased natural philosophy we divided into two branches.
biological sciences , physical sciences
Ans 3: Biological sciences: The branch of natural philosophy which deals with the study of liviing things is called biological sciences
Ans 4: physical sciences: The branch of natural philosophy which deals with the study of non-living things is called physical sciences. Physical sciences were divided into five distinct disciplines
physics, chemistry , geology , astronomy , meteorology

Question # 8

What are the significant figures in the following measurements?

Ans 1: 1- 1.66 x10^-27kg =1.66/10^27 kg = 1.66/100000000000000000000000000 kg =0.0000000000000000000000000166 kg Significant figures =3 2- 2001s Significant =4 3- 1.009m Significant =4

Question # 9

What is meant by Vernier callipers? Write its construction.

Ans 1: Vernier Callipers: A vernier callipers consist of two jaws. One is a fixed jaw with main scale attached to it. Main scale has centimeter and millimeter marks on it the other jaw is a moveable jaw, it has a vernier scale having 10 divisions over it such that each of its divisions is 0.9mm.The difference between one small division on main scale division and one vernier scale division is 0.1mm. It is called least count of the vernier callipers. Least count of =Smallest reading on main scale /no. Of decision on vernier scale Vernier Callipers LC = 1mm/10divisions = 0.1mm LC = 0.1mm = 0.01cm Zero Error and Zero Correction: First of all find the zero error. To find the zero error close the jaws of Vernie, callipers gently.Zero error will exist if zero line of the vernier scale is not coinciding with the zero of main scale Knowing the zero error , necessary correction can be made to find the correct measurement is called zero correction. Taking a Reading on Vernier Callipers: Find the diameter of a solid cylinder using vernier Callipers.Close the jaws till they press the opposite sides of the object gently. Note the complete divisions of main scale past the vernier scale zero in a tabular form. Next find the vernier scale division that is coinciding with any division on the main scale. multiply it by least count of vernier Callipers and add it in the main scale reading. This is equal to the diameter of the solid cylinder. Add zero correction (Z.C) to get correct measurement Repeat the above procedure and record at least three observations with the solid cylinder displaced or rotated each time

Question # 10

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.

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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

9th Class Urdu Medium Subjects

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

Your hair grow at the rate of 1mm per day . Find their growth rate in nms^-1

Define Physical quantities. Also write its types.

Write note on significant figure

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

What is the importance of physics in our daily life

Write a note on Waves as carriers of Energy?

Define science and describe how science was divided into various branches

What are the significant figures in the following measurements?

What is meant by Vernier callipers? Write its construction.

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

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

Your hair grow at the rate of 1mm per day . Find their growth rate in nms^-1

Define Physical quantities. Also write its types.

Write note on significant figure

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

What is the importance of physics in our daily life

Write a note on Waves as carriers of Energy?

Define science and describe how science was divided into various branches

What are the significant figures in the following measurements?

What is meant by Vernier callipers? Write its construction.

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

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

Write note on significant figure

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

Define scientific notation. describe it with examples

Define physical quantities and explain its types

Define Physical quantities. Also write its types.

What are the significant figures in the following measurements?

Your hair grow at the rate of 1mm per day . Find their growth rate in nms^-1

Write a note on Ripple Tank?

Define unit and what is international system of units

What is meant by Vernier callipers? Write its construction.

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

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