## Multiple Choice Questions

Chapter 4 – Turning Effect of Forces

## Long Questions

Chapter 4 – Turning Effect of Forces

## Short Questions

Chapter 4 – Turning Effect of Forces

## Exercise Questions

Chapter 4 – Turning Effect of Forces

## Exercise Numerical

Chapter 4 – Turning Effect of Forces

## Chapter 4 – Turning Effect of Forces

A force of 150 N can loosen a nut when applied at the end of a spanner 10cm long.

F          =          150 N

L          =          10 cm =          0.1 m

So

t          =          F x L

t          =          150 x 0.1

t          =          15 Nm

What should be the length of the spanner to loosen the same nut with a 60 N force?

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Ans:    As

t          =          F x L

15        =          60 x L

L          =         15 / 60

L          =          0.25 m

L          =          25 cm

How much force would be sufficient to loosen it with a 6 cm long spanner?

Ans:    As

L          =          6 cm =          0.06 m

t          =          F x L

15        =          F x 0.06 m

L          =    15 / 0.06

L          =          250 N

Can a smart child play with a fat child on the see-saw? Explain how?

Ans:    Yes, Fat child can play with smart child by adjusting the moment arm.

Two children are sitting on the see-saw, such that they can not swing. What is the net torque in this situation?

Ans:    In this case, net torque such that they can swing. In this case, net torque would be zero because clockwise torque is equal to Anticlockwise torque.

A ladder leaning at a wall as shown in figure 4.31 is in equilibrium. How?

Ans:    Ladder is in equilibrium because it satisfies second condition of equilibrium.

The weight of the ladder in figure 4.31 produces an anticlockwise torque. The wall pushes the ladder at its top end thus produces a clockwise torque. Does the ladder satisfy second condition for equilibrium?

Ans:    Yes, it satisfies second condition of equilibrium because both torques are equal in magnitude but opposite in direction.

Does the speed of a ceiling fan go on increasing all the time?

Ans:    Speed of ceiling fan does not increase all the times. At acquiring maximum speed it moves with uniform speed.

Does the fan satisfy second condition for equilibrium when rotation with uniform speed?

Ans:    No, it does not satisfy the second condition of equilibrium. Because it neither in the state of rest nor moving with uniform velocity.

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### This Post Has 42 Comments

1. Razzaq

It realy help me

2. asim saeed

wow

1. Heyah

Excelent really helped me alot

Sir extra Short questions ni mill rhy

1. Ahmed

Sir please upload pairing and guide of tarjama tul quran

4. Naveed Javed

Sir extra Short questions ni mill rhy

1. Nawas

Did you find extra short questions? If yes kindly share it

5. ...

Mistake in last problem..

1. Author

ok, we’ll correct it

6. Laiba Ameer

The first McQ is wrongly answered.
Couple

1. Author

ok, we’ll correct it

7. Ali

The first mcq of exercise is wrong. The correct answer is COUPLE. Kindly, correct it.

1. Author

ok, we’ll correct it

8. Suleman

Mistake in first MCQ

9. Suleman

This website really helped me

10. HAFSA AMIR

TWO PEOPLE ALRIDY SAY THIS WHY ARE YOU REPATIN THE SAME MISTAKE

1. Hashim

Acha

11. EMAAN

Sir Kindly Correct the First MCQ it is wrong

1. Author

OK, we’ll correct it.

12. Arfa

This website is amazing

In questions, MCQs no. 1 is incorrect. The correct answer is COUPLE

1. Author

OK, we’ll correct it.

14. Anam

this website is nice

15. Haniyeh

Sir in numerical 10, the length 2 is 1cm, you have wrote 50. Kindly check it up.

1. Soon hak

Thank you so much

16. Aqsachaudhary2002

Dear sir the answer of 1st numerical was wrong please check again

1. Author

ok, we’ll check it.

17. Rayyan

the 4.1 First MCQ is incorrect,its a couple,not a torrque

1. Organizer

ok, we’ll check it.

18. Ubaid

Question KY answer likhny my taklif Hoti hy go Q no 2 likh dyty ho

1. Erina

😂wahi toh itni mushkil hoti

Ninth class physics chapter no.4 numerical no.10 solution is incorrect

1. Author

Okay, we’ll check it.

20. *Areesha Mirza*

It’s really really soo helpful for me…. Thx slot for this website ☺…& the first Mcq is wrong but my bro told me this…. So it is not a major problem… 🤗

21. Hanan

Sir physics class 9 ch 4 mcqs no 1 is incorrect. Correct answer is ( couple ). Please correct it. Thank you so much for your hard work. May Allah bless you more.

1. Organizer

ok, we’ll check it.

22. Azaan

In the question of 4.2 ..Find the perpendicular components..Not the rectangular. Please correct this mistake

1. Organizer

ok, we’ll check it.

23. Dawood Nasir

The first mcqs is wrongly answered .

24. Shumaila