1. A pressure cooker cooks food faster because it increases:
A) Volume of water
B) Atmospheric pressure
C) Boiling point of water
D) Size of flame
Right Answer: C) Boiling point of water
2. The working principle of a pressure cooker is based on:
A) Boyle’s Law
B) Charles’s Law
C) Increase in pressure raises boiling point
D) Reflection of heat
Right Answer: C) Increase in pressure raises boiling point
3. At normal atmospheric pressure, water boils at:
A) 50°C
B) 75°C
C) 100°C
D) 120°C
Right Answer: C) 100°C
4. Inside a pressure cooker, water can boil above 100°C because:
A) Salt is added
B) Pressure increases
C) Flame is higher
D) Lid is heavy
Right Answer: B) Pressure increases
5. The safety valve in a pressure cooker is made of:
A) Wood
B) Rubber
C) Low melting point metal
D) Plastic
Right Answer: C) Low melting point metal
6. Steam formed in a pressure cooker is an example of:
A) Solid
B) Liquid
C) Gas
D) Plasma
Right Answer: C) Gas
7. The whistle of a pressure cooker releases:
A) Water
B) Steam
C) Smoke
D) Oxygen
Right Answer: B) Steam
8. Cooking time decreases in a pressure cooker mainly because of:
A) Reduced heat
B) Increased boiling temperature
C) Open lid
D) Air circulation
Right Answer: B) Increased boiling temperature
9. If the vent pipe is blocked, the cooker may:
A) Cool down
B) Stop cooking
C) Burst
D) Leak water slowly
Right Answer: C) Burst
10. The gasket in a pressure cooker helps to:
A) Increase flame
B) Seal the lid tightly
C) Reduce weight
D) Increase volume
Right Answer: B) Seal the lid tightly
11. Pressure inside a cooker is usually higher than:
A) Sea level pressure
B) Mountain pressure
C) Room pressure
D) Vacuum pressure
Right Answer: A) Sea level pressure
12. The material commonly used to make pressure cookers is:
A) Glass
B) Aluminum or Stainless Steel
C) Wood
D) Copper wire
Right Answer: B) Aluminum or Stainless Steel
13. High pressure inside the cooker results in:
A) Lower boiling point
B) Higher boiling point
C) No boiling
D) Instant freezing
Right Answer: B) Higher boiling point
14. A pressure cooker works faster at sea level than on mountains because:
A) Atmospheric pressure is higher at sea level
B) Water is salty
C) Flames are bigger
D) Cookers are heavier
Right Answer: A) Atmospheric pressure is higher at sea level
15. Steam pressure pushes the weight (whistle) upward due to:
A) Gravity
B) Friction
C) Force of pressure
D) Magnetism
Right Answer: C) Force of pressure
16. The energy transformation in a pressure cooker is mainly:
A) Mechanical to electrical
B) Chemical to light
C) Heat to pressure energy
D) Sound to heat
Right Answer: C) Heat to pressure energy
17. When steam condenses inside the cooker, it turns into:
A) Ice
B) Water
C) Oxygen
D) Hydrogen
Right Answer: B) Water
18. Pressure is defined as:
A) Force per unit area
B) Area per unit force
C) Mass per volume
D) Volume per mass
Right Answer: A) Force per unit area
19. The lid of a pressure cooker is designed to:
A) Allow air inside
B) Let heat escape
C) Withstand high pressure
D) Reduce cooking speed
Right Answer: C) Withstand high pressure
20. The sound of the whistle indicates that:
A) Food is burnt
B) Pressure is released
C) Cooker is empty
D) Water is frozen
Right Answer: B) Pressure is released
21. Cooking pulses in a pressure cooker is faster because proteins:
A) Freeze quickly
B) Denature at higher temperature
C) Evaporate
D) Turn into gas
Right Answer: B) Denature at higher temperature
22. The rubber gasket prevents:
A) Steam leakage
B) Flame increase
C) Sound production
D) Food burning
Right Answer: A) Steam leakage
23. If water level is too low in a cooker, it may cause:
A) Faster cooking
B) Overheating
C) Lower pressure
D) Ice formation
Right Answer: B) Overheating
24. Pressure cookers are examples of:
A) Closed systems
B) Open systems
C) Isolated systems
D) Vacuum systems
Right Answer: A) Closed systems
25. The higher the pressure, the ______ the boiling point.
A) Lower
B) Higher
C) Same
D) Zero
Right Answer: B) Higher
26. The main gas responsible for pressure inside the cooker is:
A) Nitrogen
B) Oxygen
C) Steam
D) Carbon dioxide
Right Answer: C) Steam
27. The safety valve melts when:
A) Pressure is normal
B) Pressure becomes excessive
C) Water is cold
D) Lid is open
Right Answer: B) Pressure becomes excessive
28. Pressure cookers save fuel because:
A) They cook faster
B) They use no flame
C) They reduce pressure
D) They increase evaporation
Right Answer: A) They cook faster
29. Steam carries more heat energy than boiling water due to:
A) Color
B) Latent heat
C) Weight
D) Volume
Right Answer: B) Latent heat
30. A pressure cooker should never be opened immediately after cooking because:
A) Food is cold
B) Pressure is still high inside
C) Water is solid
D) Flame is off
Right Answer: B) Pressure is still high inside