NTSE SAT Physics Use Of Electricity In Daily Life MCQs

Question: Electric fuse in an alloy of :

• a) Lead and Tin
• b) Lead and Copper
• c) Lead and Zinc
• d) Tin and Zinc

Answer: Lead and Tin

Question: A circuit has fuse of 5A. What is the maximum number of 100W (220 V) bulb that can be safely used in the circuit ?

• a) 5
• b) 7
• c) 9
• d) 11

Answer: 11

Question: Road lights are connected in :

• a) Parallel
• b) Series
• c) Parallel or series
• d) Parallel and series

Answer: Parallel

Question: An electric heater of 1500 Watt is switched on for 10 hours. The electric energy consumed by the heater is :

• a) 5.4 × 107 J
• b) 3.6 × 107 J  
• c) 1.8 × 107 J 
• d) 0.9 × 107 J

Answer: 5.4 × 107 J

Question: In Govind’s house, the reading of the electricity meter so the 1st of January was 4365.7 and on the 31st of March, it was 5896. What will be the total electricity bill for this period of three months it the cost of electricity is 60 paise per unit ?

• a) Rs. 920
• b) Rs. 918.18
• c) Rs. 919
• d) None of these

Answer: Rs. 918.18

Question: In your city electricity costs Rs. 4.25 per kWh. you pay for :

• a) Electric charge
• b) Electric power
• c) Electric energy
• d) Electric current

Answer: Electric energy

Question: Heat generated in a conductor depends :

• a) Directly on time
• b) Reciprocally on time
• c) Both A and B are true
• d) None of the above

Answer: Directly on time

Question: How many calories of heat will approximately be developed in a 210W electric bulb in 5 min ?

• a) 15000
• b) 1050
• c) 63.000
• d) 80,000

Answer: 15000

Question: In our home all electrical devises operate on 220 V. It implies that :

• a) They are connected in parallel
• b) They all have the same resistance
• c) They are connected in series
• d) They all have current of equal values

Answer: They are connected in parallel

Question: Melting point of the material of the fuse should be :

• a) Low
• b) High
• c) High or low
• d) None of these

Answer: Low