1. Question 1 of 25

   A hydraulic jack or car lift works on

   A Pascal's law B Boyle's law C Ohm's law D Newton's third law only
2. Question 2 of 25

   Suction cups stick to a smooth wall because of

   A Gravity B Atmospheric pressure C Magnetism D Friction only
3. Question 3 of 25

   It is easier to float in sea water than in river water because sea water has

   A Higher density B Lower density C Higher temperature D Less salt
4. Question 4 of 25

   Tyres have grooves (treads) to

   A Reduce friction B Increase friction and channel water away C Reduce weight D Look attractive only
5. Question 5 of 25

   About what fraction of the volume of an iceberg is below the surface of sea water?

   A About one-tenth B About nine-tenths C One-half D One-third
6. Question 6 of 25

   A submarine dives and rises by changing the amount of water in its

   A Ballast tanks B Engine C Periscope D Propeller shaft
7. Question 7 of 25

   A hydrometer is an instrument used to measure

   A Atmospheric pressure B Wind speed C Humidity D Density of liquids by floating
8. Question 8 of 25

   The SI unit of pressure is the

   A Newton B Pascal C Joule D Watt
9. Question 9 of 25

   Spreading sand on an icy road

   A Reduces friction B Melts the road C Increases friction D Reduces the temperature
10. Question 10 of 25

    Rubbing your hands together makes them warm because of

    A Friction converting kinetic energy into heat B Gravity C Buoyancy D Magnetism
11. Question 11 of 25

    Ball bearings are used in machines to

    A Increase friction B Increase weight C Cool the engine D Reduce friction
12. Question 12 of 25

    A pressure cooker cooks faster because

    A It reduces the boiling point B It has a thick lid only C It removes air D Higher pressure raises the boiling point of water
13. Question 13 of 25

    A knife cuts better when sharp because

    A It is heavier B It has more force C The same force acts on a smaller area, giving higher pressure D It has less area and less pressure
14. Question 14 of 25

    Atmospheric pressure at sea level is about

    A 1,000 pascals B 10 pascals C 1,000,000 pascals D 101,325 pascals
15. Question 15 of 25

    A ship made of steel floats because

    A Steel is lighter than water B It is hollow and holds air only C It displaces a weight of water equal to its own weight D Water pushes it sideways
16. Question 16 of 25

    Life jackets help a person float because they

    A Increase the volume without adding much weight, lowering overall density B Make the person heavier C Reduce water density D Increase friction
17. Question 17 of 25

    Streamlined shapes of aeroplanes and cars reduce

    A Weight B Air resistance (drag) C Gravity D Pressure of tyres
18. Question 18 of 25

    We can walk on the ground without slipping because of

    A Gravity only B Buoyancy C Air pressure D Friction
19. Question 19 of 25

    The Plimsoll line on a ship's hull shows

    A The speed of the ship B The direction of the wind C The maximum safe loading depth D The age of the ship
20. Question 20 of 25

    Camels can walk easily on sand because their broad feet

    A Reduce pressure on the sand B Increase pressure C Increase friction only D Reduce weight
21. Question 21 of 25

    The force of friction between two surfaces depends on

    A Colour of surfaces B Nature of the surfaces and the normal force C Area of contact only D Speed only
22. Question 22 of 25

    Dams are made thicker at the bottom because

    A Water pressure increases with depth B Water is heavier at the top C Concrete is cheaper at the bottom D Fish need more space
23. Question 23 of 25

    Pressure is defined as

    A Force times area B Mass per unit volume C Force per unit area D Work per unit time
24. Question 24 of 25

    A drinking straw works because

    A Liquid is attracted by the lips B Gravity pulls the liquid up C Pressure inside the mouth is reduced and atmospheric pressure pushes the liquid up D The straw is hollow
25. Question 25 of 25

    A hot air balloon rises because the heated air inside is

    A Heavier than outside air B Moving faster only C Colder D Less dense than the surrounding air

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