1. An electric iron works on the principle of:
A) Chemical effect of current
B) Heating effect of current
C) Magnetic effect of current
D) Cooling effect of current
Answer: B) Heating effect of current
2. The heating element of an electric iron is usually made of:
A) Copper
B) Aluminium
C) Nichrome
D) Iron
Answer: C) Nichrome
3. Nichrome is used in electric irons because it:
A) Has low resistance
B) Has high melting point and high resistance
C) Conducts heat poorly
D) Is very cheap
Answer: B) Has high melting point and high resistance
4. The device used to maintain a constant temperature in an electric iron is:
A) Fuse
B) Switch
C) Thermostat
D) Motor
Answer: C) Thermostat
5. The base plate of an electric iron is generally made of:
A) Wood
B) Plastic
C) Steel
D) Rubber
Answer: C) Steel
6. When current passes through the heating element, electrical energy converts into:
A) Light energy
B) Mechanical energy
C) Heat energy
D) Sound energy
Answer: C) Heat energy
7. The thermostat in an electric iron works on the principle of:
A) Magnetic attraction
B) Bimetallic strip expansion
C) Chemical reaction
D) Induction
Answer: B) Bimetallic strip expansion
8. The purpose of a fuse in an electric iron is to:
A) Increase temperature
B) Reduce voltage
C) Protect from excess current
D) Store electricity
Answer: C) Protect from excess current
9. Steam irons remove wrinkles more effectively because:
A) Steam increases friction
B) Steam softens fabric fibers
C) Steam decreases temperature
D) Steam reduces weight
Answer: B) Steam softens fabric fibers
10. The power rating of most household electric irons is approximately:
A) 50–100 W
B) 200–300 W
C) 750–2000 W
D) 5000 W
Answer: C) 750–2000 W
11. If voltage increases, the heat produced in an iron will:
A) Decrease
B) Remain same
C) Increase
D) Become zero
Answer: C) Increase
12. The unit of electrical power consumed by an iron is:
A) Volt
B) Watt
C) Ampere
D) Ohm
Answer: B) Watt
13. The cord of an electric iron is covered with plastic mainly to:
A) Make it attractive
B) Reduce cost
C) Provide insulation
D) Increase resistance
Answer: C) Provide insulation
14. Dry ironing is different from steam ironing because it:
A) Uses water vapor
B) Does not use water
C) Uses more electricity
D) Uses no thermostat
Answer: B) Does not use water
15. The formula used to calculate heat produced in the iron is:
A) V = IR
B) H = I²RT
C) P = VI
D) F = ma
Answer: B) H = I²RT
16. The main safety feature in modern electric irons is:
A) Plastic body
B) Auto cut-off system
C) Loud alarm
D) Heavy weight
Answer: B) Auto cut-off system
17. If an iron has a higher resistance, it will:
A) Produce more heat
B) Produce less heat
C) Not heat up
D) Melt immediately
Answer: A) Produce more heat
18. The function of the temperature control knob is to:
A) Control current
B) Change wire length
C) Adjust heat level
D) Store heat
Answer: C) Adjust heat level
19. The soleplate of steam irons has small holes to:
A) Reduce weight
B) Release steam
C) Increase resistance
D) Store water
Answer: B) Release steam
20. If the thermostat fails, the iron may:
A) Stop heating completely
B) Overheat
C) Produce sound
D) Produce light
Answer: B) Overheat
21. Electrical energy consumed by an iron is measured in:
A) Kilowatt-hour (kWh)
B) Newton
C) Joule per second
D) Pascal
Answer: A) Kilowatt-hour (kWh)
22. The heating element is insulated from the outer body to:
A) Increase weight
B) Prevent electric shock
C) Reduce heat
D) Save electricity
Answer: B) Prevent electric shock
23. Pressing clothes at very high temperature may:
A) Strengthen fabric
B) Remove color
C) Damage fabric
D) Reduce wrinkles permanently
Answer: C) Damage fabric
24. The indicator light on an iron shows that:
A) Water is empty
B) Power is on
C) Steam is released
D) Iron is broken
Answer: B) Power is on
25. The resistance of nichrome wire is higher than copper because:
A) It is thinner
B) It has higher resistivity
C) It is longer
D) It is heavier
Answer: B) It has higher resistivity
26. Using an iron with wet hands may cause:
A) Faster ironing
B) Electric shock
C) More steam
D) No heating
Answer: B) Electric shock
27. A 1000 W iron used for 1 hour consumes:
A) 1 kWh
B) 100 kWh
C) 0.1 kWh
D) 10 kWh
Answer: A) 1 kWh
28. The outer casing of modern irons is often made of:
A) Glass
B) Plastic
C) Gold
D) Wood
Answer: B) Plastic
29. When the set temperature is reached, the thermostat:
A) Increases current
B) Cuts off current temporarily
C) Breaks permanently
D) Doubles voltage
Answer: B) Cuts off current temporarily
30. The main purpose of ironing clothes is to:
A) Change color
B) Kill insects
C) Remove wrinkles
D) Reduce size
Answer: C) Remove wrinkles