Science Practice Quiz 209

Q1.Who among the following scientists, known for his work related to the magnetic effect of electric current, lived from A.D. 1777 to 1851?

A. Hans Christian Oersted B. Michael Faraday C. Alessandro Volta D. Thomas Edison

Q2.According to the provided text, what is the primary observation when an electric current is passed through a wire wrapped around a matchbox tray containing a compass needle?

A. The compass needle remains stationary B. The compass needle starts vibrating rapidly C. The compass needle shows a deflection D. The compass needle heats up significantly

Q3.What is the primary purpose of using fuses in electrical circuits?

A. To increase the voltage in the circuit B. To reduce the power consumption C. To prevent damages to electrical circuits and possible fires D. To store electrical energy

Q4.As of the 2024-25 reprint, what electrical safety device is increasingly being used in place of fuses and automatically turns off when the current in a circuit exceeds the safe limit?

A. Voltage stabilizers B. Miniature Circuit Breakers (MCBs) C. Capacitors D. Resistors

Q5.How does a Miniature Circuit Breaker (MCB) restore the circuit after it automatically turns off due to excessive current?

A. It automatically resets itself after a short delay B. The user needs to replace a burnt-out component C. The user needs to turn the switch to the ‘ON’ position D. It requires a professional electrician to reset it

Q6.What specific mark should be looked for on proper fuses and Miniature Circuit Breakers (MCBs) as a safety recommendation in the provided text?

A. ISO mark B. CE mark C. ISI mark D. BIS mark

Q7.The text mentions that fuses used in houses (Fig. 10.14) and fuses generally used in electrical appliances (Fig. 10.15) are examples of what characteristic of fuses?

A. Their varying material composition B. Their different current ratings C. Their distinct purposes and applications D. Their specific manufacturing standards

Q8.What is an electromagnet, according to the provided text?

A. A coil that permanently retains magnetism. B. A natural magnet found in the earth's crust. C. A coil that behaves like a magnet only when electric current flows through it and generally loses its magnetism when the current is switched off. D. A device used to measure electric current.

Q9.Which of the following statements accurately describes the strength and capability of electromagnets?

A. Electromagnets can only lift small, lightweight objects. B. Electromagnets are always weaker than natural magnets. C. Electromagnets can be made very strong and can lift very heavy loads. D. Electromagnets lose their magnetic properties permanently after a single use.

Q10.In which of the following applications are strong electromagnets specifically mentioned as being used?

A. As a compass needle for navigation. B. To power small electronic watches. C. Attached to the end of cranes to lift very heavy loads. D. For generating static electricity.

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Science Practice Quiz 209