100% FREE ACCESS11th Standard CBSE Syllabus & Materials
11th Standard CBSE
CBSE 11th Economics PART-A - Presentation of Data - New Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Economics PART-A - Organisation of Data - New Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Economics PART-A - Collection of Data - New Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Economics PART-A - Introduction to Economics and Statistics - New Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Business Studies International Trade Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Business Studies Evolution and Fundamentals of Business Sample Question Papers Study Material - QB365 Set A
Published on: 29/08/2019
System of Particles and Rotational Motion
Download CBSE Class 11th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test
1.
A constant torque of 120 N-m rotates its point of action by an angle of 30\(^{o}\). What is the work done by the torque?
2.
What is the moment of inertia of a sphere of mass 20 kg and radius \(\frac { 1 }{ 4 } \) m about its diameter?
3.
About which axis would a uniform cube have a minimum rotational inertia?
4.
Does the radius of gyration depend upon the speed of rotation of the body?
5.
In a flywheel, most of the mass is concentrated at the rim. Explain why?
6.
Two solid spheres of the same mass are made of metals of different densities. Which of them has a larger moment of inertia about the diameter?
7.
Does the moment of inertia of a rigid body change with the speed of rotation?
8.
Why is moment of inertia also called rotational inertia?
9.
A particle is moving on the x-axis with a linear velocity of 2 m/s. What will be its angular momentum about the origin?
10.
A ball is moving with a velocity of 10m/s. Suddenly, it breaks into two equal parts. What will be the speed of centre of mass of the system after explosion?
1.
Work done by the torque, W = tθ
\(= 120 \times (\frac{30 \times \pi}{180})=20πJ.\)
2.
Moment of inertia of a sphere about its diameter,
\(I=\frac{2}{5} m R^2=\frac{2}{5} \times 20 \times\left(\frac{1}{4}\right)^2=0.5 \mathrm{~kg}-m^2 .\)
3.
In a uniform cube, the mass is more concentrated about a diagonal.
4.
No, it depends only on the distribution of mass of the body.
5.
Concentration of mass at the rim increases the moment of inertia and thereby brings uniform motion.
6.
The sphere with smaller density will larger radius and hence larger moment of inertia.
7.
No. because the moment of inertia depends upon the axis of rotation and distribution of mass.
8.
The moment of inertia gives a measure of inertia in rotational motion. So, it is also called rotational inertia.
9.
Zero
10.
10 m/s
11th Standard CBSE Syllabus & Materials
11th Standard CBSE
CBSE 11th Business Studies Forms of Business Organisation Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Business Studies Business, Trade and Commerce Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Physics Waves Sample Question Papers Study Material - QB365 Set A
NEW11th Standard CBSE
CBSE 11th Physics Kinetic Theory Sample Question Papers Study Material - QB365 Set A
CBSE 11th Standard CBSE Subjects
CBSE Standards
