1 Magnetic tapes store data using: A Tiny magnets B Electric circuits C Optical dots D Chemical marks
2 What happens when the north pole of one magnet is brought near the north pole of another magnet? A They attract each other B They repel each other C They become neutral D They lose magnetism
4 Heating a magnet causes it to: A Gain magnetism B Lose magnetism C Become a superconductor D Change its poles
6 The sensitivity of a liquid-in-glass thermometer depends mainly on: A The length of the stem B The thickness of the glass bulb C The expansion of the liquid per degree rise in temperature D The color of the liquid
7 Which method is used to plot magnetic field lines using iron filings? A Sprinkle iron filings around a magnet B Heat the magnet C Hammer the magnet D Dip the magnet in water
8 According to the domain theory, what happens when a magnetic material is magnetised? A Domains align in the same direction B Domains become randomly oriented C Domains disappear completely D Domains turn into non-magnetic regions
9 Magnetic field lines outside a magnet run from: A South pole to North pole B North pole to South pole C East to West D West to East
10 Why does diffusion occur more quickly in gases than in liquids? A Gas particles are heavier than liquid particles. B Gas particles have more empty space and move faster. C Gas particles are tightly packed and vibrate. D Gas particles are attracted to each other strongly.
11 Which of the following is a magnetic storage device? A CD B Hard disk drive C USB flash drive D DVD
12 According to the domain theory, what are magnetic domains? A Large magnets B Small regions where atomic magnets are aligned C Electric charges D Magnetic field lines
13 Which of the following is the SI unit of temperature? A Celsius (°C) B Fahrenheit (°F) C Kelvin (K) D Joule (J)
14 A thermometer has a small bulb and a very narrow capillary bore. What property of the thermometer does this design mainly affect? A Range B Sensitivity C Linearity D Durability
15 The transfer of heat due to the actual movement of molecules is called: A Conduction B Convection C Radiation D Diffusion
16 Which of the following is a use of permanent magnets? A Electric bell B Compass C Electric motor D Generator
17 The random motion of small particles suspended in a fluid due to collisions with fluid molecules is called: A Diffusion B Brownian motion C Convection D Radiation
19 Which thermometer is most suitable for measuring the temperature of a person? A Clinical thermometer B Laboratory thermometer C Digital thermometer D Both A and C
20 A liquid-in-glass thermometer has a linear scale. This means that: A equal temperature intervals correspond to equal lengths of the liquid column B the thermometer can measure only one fixed temperature C the liquid in the thermometer expands non-uniformly with temperature D the thermometer has no fixed points
21 Magnetic field lines around a bar magnet are: A Closed loops B Straight lines only C Open curves D Parallel lines
22 Which material is most suitable for making a permanent magnet? A Soft iron B Copper C Steel D Aluminium
23 Which thermometer is most suitable for measuring the body temperature of a patient? A Clinical thermometer B Laboratory thermometer C Digital thermometer D Both A and C
24 کسی مقناطیسی مادے کو رگڑنے سے مقناطیسی بنانے کا کون سا طریقہ استعمال ہوتا ہے؟ A مقناطیس سے رگڑنا B مادے کو گرم کرنا C مادے کو ہتھوڑے سے مارنا D مادے کو ٹھنڈا کرنا
25 What happens to the magnetism of a magnet when it is heated strongly? A It increases B It decreases C It remains the same D It becomes permanent