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Physics Part-I
Class 11
NCERT
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Chapter 1: Physical World
16 questions
2
Chapter 2: Units and Measurements
51 questions
Q1
A calorie is a unit of heat or energy and it equals about where . Suppose we employ a system of units in which the unit of mass equals , the unit of length equals , the unit of time is . Show that a calorie has a magnitude in terms of the new units.
Q2
Explain this statement clearly:
"To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison." In view of this, which of the following statements are complete :(a) atoms are very small objects
(b) a jet plane moves with great speed
(c) the mass of Jupiter is very large
(d) the air inside this room contains a large number of molecules
(e) a proton is much more massive than an electron
(f) the speed of sound is much smaller than the speed of light.
Q3
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 and 20 s to cover this distance ?
View all question3
Chapter 3: Motion in Straight Line
50 questions
4
Chapter 4: Motion in a Plane
43 questions
5
Chapter 5: Laws of motion
52 questions
6
Chapter 6: Work, Energy and Power
41 questions
7
Chapter 7: System of Particles and Rotational Motion
45 questions
8
Chapter 8: Gravitation
33 questions
Question
Easy
Solving time: 3 mins
Explain this statement clearly:"To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison." In view of this, which of the following statements are complete :
(a) atoms are very small objects
(b) a jet plane moves with great speed
(c) the mass of Jupiter is very large
(d) the air inside this room contains a large number of molecules
(e) a proton is much more massive than an electron
(f) the speed of sound is much smaller than the speed of light.
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Text solution
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When any dimensional quantity is to be specified as large or small, it should always be relative. For example, a person weighing 150 kg might be heavy for us, but compared to weight of earth, it is negligible.
The sentences which require re frame are as follows:
(a) Atoms are very small objects compared to normal objects like duster, watch etc.
(b) A jet moves with great speed compared to a train.
(c) The mass of Jupiter is much more than the mass of earth.
(d) The air inside the room contains more molecules than entire human population of earth.
The sentences which require re frame are as follows:
(a) Atoms are very small objects compared to normal objects like duster, watch etc.
(b) A jet moves with great speed compared to a train.
(c) The mass of Jupiter is much more than the mass of earth.
(d) The air inside the room contains more molecules than entire human population of earth.
(e), (f) are complete
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Practice more questions from Physics Part-I (NCERT)
Q1
A calorie is a unit of heat or energy and it equals about where . Suppose we employ a system of units in which the unit of mass equals , the unit of length equals , the unit of time is . Show that a calorie has a magnitude in terms of the new units.
Q2
Explain this statement clearly:
"To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison." In view of this, which of the following statements are complete :(a) atoms are very small objects
(b) a jet plane moves with great speed
(c) the mass of Jupiter is very large
(d) the air inside this room contains a large number of molecules
(e) a proton is much more massive than an electron
(f) the speed of sound is much smaller than the speed of light.
Q3
A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 and 20 s to cover this distance ?
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| Question Text | Explain this statement clearly: "To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison." In view of this, which of the following statements are complete :(a) atoms are very small objects (b) a jet plane moves with great speed (c) the mass of Jupiter is very large (d) the air inside this room contains a large number of molecules (e) a proton is much more massive than an electron (f) the speed of sound is much smaller than the speed of light. |
| Updated On | Sep 21, 2022 |
| Topic | Units and Measurements |
| Subject | Physics |
| Class | Class 11 |
| Answer Type | Text solution:1 Video solution: 5 |
| Upvotes | 611 |
| Avg. Video Duration | 4 min |
