Get important questions of Units and Measurement Class 11 Physics exams. View 11th Physics other chapters’ important questions for exam point of view. These important questions will play significant role in clearing concepts of the subject. This question bank is designed by top IITian Faculties keeping NCERT in mind and the questions are updated with respect to upcoming Board exams. You will get here all the important questions with answers for class 11 Physics Chapter Units and Measurement.

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**Q. What is a unit? Give an example.**

**Sol.**

**Q. What is the necessity of selecting some units as fundamental units?**

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**Q. Define the S.I. unit of solid angle.**

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**Q. Define light year.**

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**Q. Define a parsec.**

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**Q. What is the largest practical unit of mass?**

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**Q. What is lunar month?**

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**Q. How many shakes are there in 1 second?**

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**Q. What is a leap year?**

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**Q. The farthest objects in our universe are known as quasars (quasi-stellar radio sources). Much is not known about these objects. Electromagnetic wave emitted by quasars take billions of years to reach earth. Calculate distance of a quasar from which electromagnetic wave take three billion years to reach earth.**

[NCERT]

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**Q. The radius of the hydrogen atom is nearly 0.5 A.What is the total atomic volume in of a mole of hydrogen atoms?**

[NCERT]

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**Q. The moon is observed from two diametrically opposite points and on earth. The angle**

**subtended at the moon by the two directions of observation is ‘ Given the diameter of earthto be about . Calculate the distance of the moon form the earth.**

[NCERT]

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**Q. The sun’s angular diameter is measured to be 1920. The distance of the sun from the earth is What is the diameter of the sun?**

[NCERT]

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**Q. Give examples of three physical quantities which have the same dimensions.**

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**[esquestion] What is the unit of pressure if the unit of mass is**

**kg, the unit of length is metre and the unit of time is minute?**

**Q. Convert into erg.**

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**Q. Calculate the value of force 100 dynes on a system based on a metre, kilogram and minute as fundamental units.**

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**Q. What is a null vector?**

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**Q. What are co-initial and collinear vectors?**

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**Q. What is the significance of null vector?**

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**Q. Can three unequal forces add upto zero?**

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**Q. Under what condition the directions of sum and difference of two vectors will be same?**

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**Q. Point out the essential condition for the addition of vectors.**

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**Q. What is the difference between and**

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**Q. Which of the following quantities are independent of the choice of orientation of the co-ordinate axes? angle between and where is a scalar?**

[NCERT]

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**Q. A vector has magnitude and direction. Does it have a location in space? Will two equal vectors and at different locations in space necessarily have identical physical effects?**

[NCERT]

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**Q. Pick out the two scalar quantities in the following list: Force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, reaction as per Newton’s third law, relative velocity.**

[NCERT]

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**Q. Pick out only the vector quantities from the following list: Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction and charge.**

[NCERT]

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**Q. Can you associate vectors with (i) length of a wire**

**bent into a loop (ii) a plane area (iii) a sphere?**

[NCERT]

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**Q. A vector has both magnitude and direction. Does that mean anything that has magnitude and direction is necessarily a vector? The rotation of a body can be specified by the direction of the axis of rotation and the angle of rotation about the axis. Does that make any rotation a vector?**

[NCERT]

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**Q. The position of a particle is given by**

$\left.3.0 t \hat{i}+2.0 t^{2} \hat{j}+5.0 \hat{k}\right)$

$\left.3.0 t \hat{i}+2.0 t^{2} \hat{j}+5.0 \hat{k}\right)$

[NCERT]

**Sol.**

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