इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमाप मराठी स्वाध्याय PDF

 

इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमाप मराठी स्वाध्याय PDF

या लेखात, आम्ही विज्ञान भौतिक प्रमाणांचे मोजमाप विषयासाठी इयत्ता सातवी मराठी सोल्यूशन्स देऊ. इयत्ता सातवी मधील विद्यार्थी पाठ्यपुस्तकांमध्ये उपस्थित असलेल्या व्यायामांसाठी प्रश्न आणि उत्तरे डाउनलोड आणि कॉपी करण्यास सक्षम असतील.

इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमापाच्या पुस्तकात महाराष्ट्र बोर्डाच्या अभ्यासक्रमातील सर्व प्रश्नांचा समावेश आहे. येथे सर्व प्रश्न पूर्ण स्पष्टीकरणासह सोडवले आहेत आणि डाउनलोड करण्यासाठी विनामूल्य उपलब्ध आहेत. महाराष्ट्र बोर्ड इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमापाचे पुस्तक खाली दिले आहे. आम्‍हाला आशा आहे की आमच्‍या इयत्‍ता सातवी वीच्‍या विज्ञान भौतिक प्रमाणांचे मोजमापाचे पुस्‍तक तुमच्‍या अभ्यासात मदत करेल! जर तुम्हाला आमचे इयत्ता सातवी चे पुस्तक आवडले असेल तर कृपया ही पोस्ट शेअर करा.

इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमाप स्वाध्याय

मंडळाचे नाव	Maharashtra Board
ग्रेडचे नाव	सातवी
विषय	विज्ञान भौतिक प्रमाणांचे मोजमाप
वर्ष	2022
स्वरूप	PDF/DOC
प्रदाता	hsslive.co.in
अधिकृत संकेतस्थळ	mahahsscboard.in

समाधानासह महाराष्ट्र बोर्ड आठवा स्वाध्याय कसे डाउनलोड करायचे?

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1. वेबसाइट- Hsslive ला भेट द्या. 'स्वाध्याय' लिंकवर क्लिक करा.
2. महा बोर्ड सातवी स्वाध्याय PDF पहा.
3. आता महाराष्ट्र बोर्ड सातवी स्वाध्याय तपासा.
4. डाउनलोड करा आणि भविष्यातील संदर्भांसाठी जतन करा.

इयत्ता सातवी विज्ञान भौतिक प्रमाणांचे मोजमाप स्वाध्याय उपाय

इयत्ता सातवी स्वाध्याय मधील विद्यार्थी खालील लिंक्सवरून विज्ञान भौतिक प्रमाणांचे मोजमापाचे उपाय डाउनलोड करू शकतील.

Class 7 Science Chapter 6 Measurement of Physical Quantities Textbook Questions and Answers

1. Write answers to the following questions in your own words:

Question a.
Why is the weight of the same object different on different planets?
Answer:
The weight of the same object is different on different planets because weight depends on the gravitational force of the planet and gravitational force on every planet is different so the weight also differs from planet to planet.

Question b.
What precautions will you take to make accurate measurements in day-to-day affairs?
Answer:
Following precautions will be taken to make accurate measurements in day to day affairs:

1. The balance should carry the stamp of standardisation by the department of weights and measures.
2. Balance should be stable and the pointer of the balance should be upright.
3. The underside of the pan should not be tampered with any other weight or layers of other metal.
4. The weight should be made of metal.

Question c.
What is the difference between mass and weight?
Answer:

Mass	Weight
1. The amount of matter present in a substance is called mass.	1. The gravitational force that acts on this mass is called its weight.
2. It is a scalar quantity.	2. It is a vector quantity.
3. Mass remains same everywhere on the earth.	3. Weight changes from place to place on the ‘        earth.

2. Who is my companion? 

Class 7 Science Chapter 6 Measurement Of Physical Quantities Exercise Question 1.

Column ‘A’	Column ‘B’
1. Velocity	a. Litre
2. Area	b. Kilogram
3. Volume	c. metre/second
4. Mass	d. kilogram/cubic metre
5. Density	e. square metre

Answer:

Column ‘A’	Column ‘B’
1. Velocity	c. metre/second
2. Area	e. square metre
3. Volume	a. Litre
4. Mass	b. Kilogram
5. Density	d. kilogram/cubic metre

3. Explain giving examples. 

Question a.
Scalar quantity:
Answer:
A quantity that can be completely expressed by its magnitude alone is called a scalar quantity, e.g. length, breadth, area, mass, temperature, density, time, work. In all these examples a value with a unit is used to express quantities. Thus, we say that the length of a tunnel is 2 km.

Question b.
Vector quantity:
Answer:
The quantity that is expressed completely only.’ v when magnitude and direction are both given is called a vector quantity. Displacement, velocity are vector quantities e.g. a displacement of 20 km towards north, the aeroplane flying at a velocity of 500 km/hr towards Mumbai.

4. Explain, giving examples, the errors that occur while making measurements.

Question a.
Explain, giving examples, the errors that occur while making measurements.
Answer:
Major causes of errors in measurement are:

1. Not using the appropriate device.
2. Not using the device properly.

Example: While buying things at grocery shops and the vegetable market remember to look out for the following:

• The balance should carry the stamp of standardisation by the department of weights and measures.
• Balance should be stable. The pointer of the balance should be upright.
• No changes should be done on the underside of the pan of the balance.
• Weight should be made up of metals and it has to be standardized.

5. Give reasons:

Question a.
It is not proper to measure quantities by using body parts as units.
Answer:
It is not proper to measure quantities by using body parts as units because length of the body parts changes from person to person, so accurate measurement can not be found with the body parts as units.

Question b.
It is necessary to get the weights and measures standardized at regular intervals.
Answer:
It is necessary to get the weights and measures standardized at regular intervals because of that accurate weight and measurement can be taken. Errors will be avoided.

6. Explain the need for accurate measurement and the devices to be used for that.

Question a.
Explain the need for accurate measurement and the devices to be used for that.
Answer:

1. Measurement of substances that are precious or of great importance and used in very small quantities is done meticulously and accurately.
2. Due to advancements in technology, devices that measure very small magnitudes of quantities like distance, mass, time and temperature are available now.
3. e.g. distance and time in connection with very important sports competitions, mass of gold, body temperature etc.
4. Devices to be used for this are thermometer, digital balance (Analytical balance) etc.

Project:

Class 7 Science Chapter 6 Measurement Of Physical Quantities Question 1.
Collect information about various physical quantities used in day-to-day life and the devices used for their measurement.

Class 7 Science Chapter 6 Measurement of Physical Quantities Important Questions and Answers

Fill in the blanks:

Std 7 Science Chapter 6 Measurement Of Physical Quantities Question 1.
The amount of matter present in a substance is called ………………. .
Answer:
mass

Measurement Of Physical Quantities Class 7 Exercise Question 2.
…………. is the qualitative measure of the inertia of an object.
Answer:
mass

6. Measurement Of Physical Quantities Question 3.
The larger the mass, the ……………. is the inertia.
Answer:
greater

6.Measurement Of Physical Quantities Question 4.
Mass is a …………… quantity.
Answer:
scalar

Physical Quantities And Measurement Class 7 Question 5.
…………… does not change from place to place anywhere in the world.
Answer:
mass

Measurement Of Physical Quantities Class 7 Question 6.
The gravitational force that acts on a mass is called its ……………. .
Answer:
weight

6 Measurement Of Physical Quantities Question 7.
Wright is a …………… quantity.
Answer:
vector

Question 8.
System International (SI) is also called ………….. .
Answer:
metric system

Question 9.
In Egypt in ancient times, the distance from a man’s elbow to the tip of his middle finger was called a ………… .
Answer:
cubit

Question 10.
Gold was weighed in a unit called …………… .
Answer:
gun

Who is my companion?

Question 1.

Column ‘A’	Column ‘B’
1. Gold	a. Hour glass
2. Time	b. Vector
3. Distance	c. Gunj
4. Weight	d. Cubit

Answer

Column ‘A’	Column ‘B’
1. Gold	c. Gunj
2. Time	a. Hour glass
3. Distance	d. Cubit
4. Weight	b. Vector

Say whether true or false. Correct and rewrite the false statements:

Question 1.
The standards of the six fundamental units are kept in the National Physical Laboratory at New Delhi.
Answer:
True

Question 2.
Matter has a natural tendency to resist a change in its state, which is called inertia.
Answer:
True

Question 3.
Weight and mass are both equal quantities.
Answer:
False. Weight and mass are both different quantities

Question 4.
Work is a vector quantity.
Answer:
False. Work is a scalar quantity

Question 5.
Velocity is a scalar quantity.
Answer:
False. Velocity is a vector quantity

Question 6.
Unit of time in both the systems is second.
Answer:
True

Question 7.
Unit of mass in C.G.S. system is kilogram
Answer:
False. Unit of mass in C.G.S. system is gram

Question 8.
Symbol of unit of second is sec.
Answer:
False. Symbol of unit of second is ‘s’

Question 9.
1 cubic foot means 28.317 ml
Answer:
False. 1 cubic foot means 28.317 litres.

Question 10.
Vector quantity requires magnitude only.
Answer:
False. Vector quantity required magnitude and direction both.

Give scientific reasons:

Question 1.
Weight of our body on the moon is less than that on the earth.
Answer:

1. Gravitational power of moon is less than the earth.
2. Weight depends on the gravitational power of that place.
3. Since the gravitational power of the moon is less than that of the earth, the weight on moon is less than that on the earth.

Question 2.
Mass is a scalar quantity
Answer:
Mass is a scalar quantity because it can be completely expressed by its magnitude alone, so it is scalar quantity.

Question 3.
Weight is a vector quantity.
Answer:
Weight can be expressed completely only when magnitude and direction are both given so weight is a vector quantity.

Distinguish between the following:

Question 1.
Scalar quantity and Vector quantity
Answer:

Scalar quantity	Vector quantity
1. A quantity that can be completely expressed by its magnitude alone is called a scalar quantity.	1. The quantity that is expressed completely only when magnitude and direction are both given is called a vector quantity.
2. e.g. mass, length, area, breadth, density, time, work etc.	2. e.g. velocity displacement

Question 2.
M.K.S. system and C.G.S. system
Answer:

M.K.S. system	C.G.S. system
1. In this system distance is measured in metres, mass in kilograms and time in seconds.	1. In this system distance is measured in centimetres, mass in grams and time in seconds.
2. e.g. Unit of velocity is m/sec, Unit of area is square metre.	2. e.g. Unit of velocity is cm/sec, Unit of area is square centimetre.

Define the following:

1. Mass: The amount of matter present in a substance is called mass.
2. Inertia: Matter has a natural tendency to resist a change in its state, which is called Inertia.
3. Weight: The gravitational force that acts on the mass is called its weight.
4. Physical Quantities: The quantities in day to day life which can be measured are called physical quantities.
5. Standardization: The process of checking things against a standard measure from time to time is called standardization.

Write answers to the following questions in your own words.

Question 1.
What is an atomic clock?
Answer:
An extremely accurate type of clock which is regulated by the vibrations of an atomic or molecular system such as caesium atom or ammonia is called atomic clock. It is used to maintain standard times of countries accurately.

Answer the following questions:

Question 1.
Why would the weight of an object be; maximum at the poles and minimum at the equator?
Answer:

1. The gravitational force that acts on the mass is called the weight.
2. The earth is not exactly spherical, it flattens at the poles.
3. As the distance increases the gravitational force decreases.
4. Therefore due to reduced distance at the poles compared to the equator, the weight is maximum at the poles than equator.

Question 2.
Why is the weight of an object at a high altitude less than its weight at the sea-level?
Answer:

1. The gravitational force that acts on the mass is called the weight.
2. The gravitational force is always inversely proportional to the distance.
3. So as the distance increases between the earth and the object, the gravitational force decreases.
4. The gravitational force by which the earth attracts an object towards its centre is called weight.
5. The weight at the sea-level is higher than at higher altitude, as the object is at a greater distance at higher altitudes compared to sea-level.

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निष्कर्ष

आम्हाला आशा आहे की महाराष्ट्रावरील हा लेख तुम्हाला 'सातवी विज्ञान भौतिक प्रमाणांचे मोजमाप स्वाध्याय' मदत करेल. तुम्हाला काही प्रश्न असल्यास, त्यांना खाली टिप्पणी विभागात मोकळ्या मनाने पोस्ट करा. आम्ही लवकरात लवकर तुमच्याकडे परत येऊ.