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# 1st Year Physics Chapter 2 Short Questions Notes PDF

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In this post, I am sharing FSC 1st Class Physics Chapter 2 Short Questions with Answers Notes PDF for the students of Intermediate Part 1. This chapter’s name is Vectors and Equilibrium. From this post of ilmihub, students can download the 11th class chapter 2 Vector and Equilibrium Short Questions Notes in PDF format on their laptops or mobiles. These Class 11 Physics Chapter 2 Short Questions with Answers Notes are for all the boards working under the Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. Visit this link if you want to download the complete 1st Year Physics Notes in PDF format.

## Class 11 Physics Chapter 2 Short Questions with Answers

### Can you add a zero to a null vector?

As zero is a scalar and null is a vector. So, they can never be added because physical quantities of different nature cannot be added.

### Two vectors have unequal magnitudes. Can their sum be zero?

No, their sum cannot be zero. Their sum will only be zero if both the vectors have the same magnitudes but opposite directions.

A picture is suspended from a wall by two strings. Show by diagram the configuration of the strings for which the tension in the strings will be minimal.

If ‘W’ is the weight of the picture and “T” is the tension in the strings making angle “q” horizontal as the picture is in the equilibrium, then the relation for the tension in the string will be

T sinq + Tsinq = W

2Tsinq = W
T = W/2sinq

For minimum tension
q = 900

T = W/2sin90 = 1/2W

Thus the strings should be vertical to be under minimum tension. The configuration is shown in the figure.

### Can a body rotate about its centre of gravity under the action of its weight?

The torque produced in a body given by

i  = r x F
i   = rFsinq

As the weight acts at the centre of gravity. So, the moment arm is zero,
i    = (0)Fsinq

i    = 0

Thus a body cannot rotate about its center of gravity under the action of its weight.

### Equal vector:

Two vectors are said to be equal if they have the same magnitudes and directions, regardless of the position of their initial points. This means that parallel vectors of the same magnitude are equal.

### Position vector:

The vector which indicates the position of a body with respect to the origin is called the position vector.