9th Class Physics Chapter 6 Online Test: 25 MCQs with Answers

By /

This 9th class physics chapter 6 online test covers Chapter 6 of the Class 9 Physics course, Mechanical Properties of Matter. It has 25 multiple-choice questions, shown one at a time, and it marks itself as soon as you finish. There is no timer and no sign-up. When you press finish you get your score, and every question is shown again with your answer, the correct option and a short explanation of why that option is right. An Urdu medium version of the same test is given further down this page.

What Chapter 6 Covers

The questions are spread across the whole chapter rather than one section, so the test is a fair check of whether you are ready for a class test or the annual paper:

  • Density — ρ = m ÷ V, finding the density of milk or of an irregular solid by displacement, and why density describes a material rather than an object.
  • Pressure — P = F ÷ A, the pressure a brick exerts on each of its faces, and why sharp pebbles hurt bare feet while elephants need broad feet.
  • Pressure in liquids — P = ρgh, the pressure on a diver at depth, and why pressure depends on depth and density rather than on the shape of the container.
  • Atmospheric pressure — the force of the atmosphere on a surface, the mercury barometer at 76 cm, why water would need a column about ten metres high, and what a falling barometer reading means for the weather.
  • Pascal’s law — the hydraulic press and hydraulic brakes, and how a small force on a small piston lifts a large load.
  • Elasticity and Hooke’s law — the spring constant k = F ÷ x, the energy stored in a compressed spring, and why springs are made of steel.

Revise These Before You Start

Most marks in this chapter are lost on the same few points. Read through these once before attempting the test:

  • ρ = m ÷ V. Convert carefully: 1 litre is 0.001 m³, and 1 g cm⁻³ equals 1000 kg m⁻³.
  • P = F ÷ A, so for a fixed force the pressure is greatest on the smallest face.
  • Pressure in a liquid P = ρgh depends only on depth, density and gravity, never on the shape or width of the container.
  • In a hydraulic system the pressure is the same throughout, so F₁ ÷ A₁ = F₂ ÷ A₂, and a large piston gives a proportionally larger force.
  • Spring constant k = F ÷ x. A load of 40 N stretching a spring by 20 mm gives k = 2000 N m⁻¹, which is 2 kN m⁻¹.
  • Mercury is used in barometers because it is about 13.6 times denser than water, so the column is 76 cm instead of about 10.3 m.

How the Test Works

  • 25 questions, one at a time, with Next and Previous buttons.
  • No timer, so you can work a numerical out on paper before answering.
  • Automatic marking the moment you finish.
  • Answer review with the correct option and an explanation for every question.
  • Retake as many times as you like, and your score is not stored anywhere.

Start the Chapter 6 Online Test

Chapter 6 is where unit conversion decides your score, so write every quantity in SI units before you substitute into a formula. Keep a pen and rough paper beside you: the numerical questions are quick, but they are much easier to get right written down than in your head. Aim for 20 out of 25 or better before you move on to the next chapter.

/25

Class 9 Physics Chapter 6 Online Test — Mechanical Properties of Matter

25 multiple-choice questions from Chapter 6 of the Class 9 Physics course, with automatic marking, an answer review and explanations.

1 / 25

A wire is stretched by a weight w. If the diameter of the wire is reduced to half of its previous value, the extension will become:

2 / 25

Two metal plates of area 2 and 3 square metres are placed in a liquid at the same depth. The ratio of pressures on the two plates is:

3 / 25

The principle of a hydraulic press is based on:

4 / 25

What is the force exerted by the atmosphere on a rectangular block surface of length 50 cm and breadth 40 cm? The atmospheric pressure is 100 kPa.

5 / 25

When a spring is compressed, what form of energy does it possess?

6 / 25

The length, breadth and thickness of an iron block are 3 cm, 2 cm and 2 cm, and its mass is 94 g. Its density is:

7 / 25

The mass of 5 litres of milk is 4.5 kg. Its density in SI units is:

8 / 25

A solid of mass 60 g is lowered into a measuring cylinder and the water level rises from 40 cm³ to 44 cm³. The density of the solid is:

9 / 25

The pressure of a mercury column 76 cm high (density of mercury = 13.6 × 10³ kg m⁻³, g = 10 m s⁻²) is about:

10 / 25

The diameters of the pistons of a hydraulic press are 5 cm and 25 cm. If a force of 160 N is applied on the smaller piston, the weight lifted by the bigger piston is:

11 / 25

In a hydraulic press the small and large pistons have areas of 10 cm² and 100 cm². The force needed on the small piston to lift a car of weight 4000 N is:

12 / 25

A brick measures 5 cm × 10 cm × 20 cm and its mass is 5 kg. The maximum pressure it can exert on a horizontal surface is:

13 / 25

The water pressure on a deep-sea diver at a depth of 10 m, where the density of sea water is 1030 kg m⁻³, is about:

14 / 25

If mercury in a barometer is replaced by water (density 1000 kg m⁻³), the height of the column at sea level would be about:

15 / 25

A spring is stretched 20 mm by a load of 40 N. The value of its spring constant is:

16 / 25

A spring of spring constant 2 kN m⁻¹ is stretched by 16 mm. The weight causing this extension is:

17 / 25

Springs are made of steel instead of iron because steel:

18 / 25

Heavy animals such as elephants have a large area of the foot mainly to:

19 / 25

Atmospheric pressure falls at high altitudes mainly because:

20 / 25

A fall in atmospheric pressure recorded by a barometer usually means that:

21 / 25

In the hydraulic brake system of a car, a force of 500 N acts on a piston of cross-sectional area 5 cm². The pressure transmitted to the brake oil is:

22 / 25

The same brake oil at a pressure of 1.0 × 10⁶ N m⁻² acts on a second piston of area 20 cm². The force on this piston is:

23 / 25

Hydraulic systems can move very heavy loads with a small applied force mainly because liquids:

24 / 25

Density is said to be a property of a material and not of the object made from it. This means that:

25 / 25

Walking barefooted on sharp pebbles is painful because the pebbles:

Your score is

0%

Chapter 6 Online Test — Urdu Medium

Urdu medium students can attempt the same Chapter 6 test with every question, option and explanation written in Urdu. It behaves exactly like the English test above: 25 questions one at a time, no timer, and a full answer review at the end.

/25

Class 9 Physics Chapter 6 Online Test (Urdu Medium) — Mechanical Properties of Matter

Urdu medium online test, 25 MCQs with instant result and explanations.

1 / 25

ایک تار کو وزن w سے کھینچا جاتا ہے۔ اگر تار کا قطر پہلے سے آدھا کر دیا جائے تو کھنچاؤ ہو جائے گا:

2 / 25

2 اور 3 مربع میٹر رقبے کی دو دھاتی پلیٹیں ایک مائع میں ایک ہی گہرائی پر رکھی گئی ہیں۔ دونوں پلیٹوں پر پریشر کی نسبت ہے:

3 / 25

ہائیڈرالک پریس کے اصول کی بنیاد ہے:

4 / 25

فضا ایک مستطیل سطح پر کتنی فورس ڈالتی ہے، جس کی لمبائی 50 سینٹی میٹر اور چوڑائی 40 سینٹی میٹر ہے، جبکہ فضائی پریشر 100 kPa ہے؟

5 / 25

جب کسی سپرنگ کو دبایا جائے تو اس میں کس قسم کی انرجی ہوتی ہے؟

6 / 25

لوہے کے ایک بلاک کی لمبائی، چوڑائی اور موٹائی بالترتیب 3 cm، 2 cm اور 2 cm ہے اور اس کا ماس 94 g ہے۔ اس کی ڈینسٹی ہے:

7 / 25

5 لیٹر دودھ کا ماس 4.5 kg ہے۔ SI یونٹس میں اس کی ڈینسٹی ہے:

8 / 25

60 گرام ماس کا ایک ٹھوس جسم پیمائشی سلنڈر میں ڈبویا گیا تو پانی کی سطح 40 cm³ سے بڑھ کر 44 cm³ ہو گئی۔ ٹھوس جسم کی ڈینسٹی ہے:

9 / 25

76 cm اونچے مرکری کالم کا پریشر (مرکری کی ڈینسٹی 13.6 × 10³ kg m⁻³، g = 10 m s⁻²) تقریباً ہے:

10 / 25

ایک ہائیڈرالک پریس کے پسٹنز کے قطر 5 cm اور 25 cm ہیں۔ اگر چھوٹے پسٹن پر 160 N کی فورس لگائی جائے تو بڑا پسٹن کتنا وزن اٹھائے گا؟

11 / 25

ایک ہائیڈرالک پریس کے چھوٹے اور بڑے پسٹن کے رقبے 10 cm² اور 100 cm² ہیں۔ 4000 N وزنی کار اٹھانے کے لیے چھوٹے پسٹن پر درکار فورس ہے:

12 / 25

ایک اینٹ کی پیمائش 5 cm × 10 cm × 20 cm ہے اور اس کا ماس 5 kg ہے۔ یہ افقی سطح پر زیادہ سے زیادہ کتنا پریشر ڈال سکتی ہے؟

13 / 25

گہرے سمندر میں 10 m کی گہرائی پر ایک غوطہ خور پر پانی کا پریشر، جبکہ سمندری پانی کی ڈینسٹی 1030 kg m⁻³ ہے، تقریباً ہے:

14 / 25

اگر بیرومیٹر میں مرکری کی جگہ پانی (ڈینسٹی 1000 kg m⁻³) استعمال کیا جائے تو سطح سمندر پر کالم کی اونچائی تقریباً ہوگی:

15 / 25

40 نیوٹن وزن سے ایک سپرنگ 20 ملی میٹر کھنچ جاتا ہے۔ اس کے سپرنگ کونسٹنٹ کی قیمت ہے:

16 / 25

2 kN m⁻¹ سپرنگ کونسٹنٹ والا ایک سپرنگ 16 ملی میٹر کھنچتا ہے۔ یہ کھنچاؤ پیدا کرنے والا وزن ہے:

17 / 25

سپرنگ لوہے کی بجائے سٹیل سے بنائے جاتے ہیں کیونکہ سٹیل:

18 / 25

ہاتھی جیسے بھاری جانوروں کے پیروں کا رقبہ زیادہ ہونے کا بنیادی مقصد ہے:

19 / 25

زیادہ بلندی پر فضائی پریشر کم ہو جاتا ہے، بنیادی وجہ یہ ہے کہ:

20 / 25

بیرومیٹر میں فضائی پریشر کا گرنا عام طور پر ظاہر کرتا ہے کہ:

21 / 25

ایک کار کے ہائیڈرالک بریک سسٹم میں 5 cm² عرضی رقبے کے پسٹن پر 500 N کی فورس عمل کرتی ہے۔ بریک آئل میں منتقل ہونے والا پریشر ہے:

22 / 25

وہی بریک آئل 1.0 × 10⁶ N m⁻² پریشر پر 20 cm² رقبے کے دوسرے پسٹن پر عمل کرتا ہے۔ اس پسٹن پر فورس ہے:

23 / 25

ہائیڈرالک سسٹمز تھوڑی سی فورس سے بہت بھاری وزن ہلا سکتے ہیں، بنیادی وجہ یہ ہے کہ مائعات:

24 / 25

کہا جاتا ہے کہ ڈینسٹی میٹریل کی خصوصیت ہے، اس سے بنی شے کی نہیں۔ اس کا مطلب ہے کہ:

25 / 25

کنکریوں پر ننگے پاؤں چلنا تکلیف دہ ہوتا ہے کیونکہ کنکریاں:

Your score is

0%

Mistakes Students Make in This Chapter

When you check your answer review, see whether any of your wrong answers came from these. They account for most of the marks lost in this chapter:

  • Leaving areas in cm² or volumes in cm³ instead of converting into m² and m³.
  • Assuming a wider container means greater pressure at the bottom.
  • Mixing up force and pressure when comparing the faces of a brick.
  • Using the diameter instead of the area when comparing hydraulic pistons; the area depends on the square of the radius.
  • Reading the spring extension in millimetres and using it directly as metres in k = F ÷ x.

What to Do After the Test

Do not close the page as soon as you see your score. Read the explanation under every question you got wrong, then open that topic in your textbook and work through the solved example beside it. Write the questions you missed on a single sheet and attempt the test again the next day: the second score tells you what you have actually learned, while the first only tells you what you recognised. If you scored below 15, work through the chapter again before moving on, because the later chapters in Physics build directly on this one.

Frequently Asked Questions

Why is density called a property of a material rather than of an object?

Because it does not change with size. A small iron nail and a large iron bar have very different masses and volumes, but the same density, since mass and volume increase together in the same ratio.

How does a hydraulic press lift a heavy load with a small force?

Pascal’s law says the pressure applied to an enclosed liquid is transmitted equally in all directions. The same pressure acting on a much larger piston area produces a much larger force, so a small push on the small piston lifts a heavy load.

Why is mercury used in a barometer instead of water?

Mercury is about 13.6 times denser than water, so atmospheric pressure supports a column only about 76 cm high. A water barometer would need a tube over ten metres tall, which is impractical.

Related Class 9 Physics Resources

Work through the Chapter 6 exercise short questions for written practice. The Chapter 6 constructive questions cover the longer, reasoning-based answers. You can also browse all Class 9 Physics exercise short questions and constructive questions, or open the Class 9 Physics section, which brings notes, test papers, online papers, guess papers and past papers together chapter by chapter.

1 thought on “9th Class Physics Chapter 6 Online Test: 25 MCQs with Answers”

  1. Pingback: 9th Class Physics Guess Paper 2026: 25 Bilingual Papers (English + Urdu) - ExamPaperDesk.com

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top