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

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

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

**Q. Define light year.**

**Q. Define a parsec.**

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

**Q. What is lunar month?**

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

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

**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]

**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]

**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]

**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]

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

**Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**

**[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.**

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

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

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

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

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

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

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

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

**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]

**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]

**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]

**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]

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

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

**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]

**Q. The position of a particle is given by $\left.3.0 t \hat{i}+2.0 t^{2} \hat{j}+5.0 \hat{k}\right)$**[NCERT]

What is physics

Thank you sir

Nice sir thnku very much

It is not important for us

Tq but phisics has always doubt

It’s very helpful

Thanku sir

What is physics

Branch of science that deals with nature and natural phenomena is called physics

Tq for helping

Thanks a lot

Really

Yuuullll

This is help full for neet exam tq🤗

I want more numericals please

Sorry

Nice questions

It’s so helping related to examination….

Yes it’s true

I also can’t see it .

very good question

Thank you so much

Top classs

I can’t see the answer to this. Where i can see the answers of this question

Just click on show solutions

I can’t see the answer to this.

thank you so much

Deafine physical quantity and explane it’s type

Thanks

foot

Thank you so much

Thanks a lot

Meenakshi aano?

thanks a lot

Is it helpful for neet

It was very helpfull,i find it very eazzy to clear my doubts,& learn more n …more things.Thanku so much😇😇

Good question

dnt provide us importants provide maximum no. of numericals to us plzz dnt let us have the habbit of cooked food but train us enough harder as we can cook food ourselves.thnk u🙏🙏

very very nice and helpful questions.

thankyou

Very nice questions .