Step 1: For question 54, let's analyze each option: A. Keeping a gas cylinder in a horizontal position to avoid the gas from rising up - This is NOT recommended as gas cylinders should always be stored in an upright position. B. Educate people around you on gas cylinder safety - This is a recommended safety measure. C. Make sure that there are no inflammable materials near the gas cylinder - This is a recommended safety measure. D. Store gas cylinders where they are protected from damage - This is a recommended safety measure.

Explanation: Keeping a gas cylinder in a horizontal position is NOT recommended as it can lead to safety hazards. Gas cylinders should always be stored in an upright position to prevent accidents. †Answer: Answer: A. Keeping a gas cylinder in a horizontal position to avoid the gas from rising up.

Step 2: For question 55, let's analyze the statement: If the magnetic field lines are denser in a certain region than in another region, then:

A. the intensity of the magnetic field in the region is smaller than in the other regions. B. it can exert a larger force on a charge at rest in the region than in the other regions. C. the source of the magnetic field could be an isolated magnetic pole. D. it can exert a larger force on a charge moving in the region than in the other regions.

Explanation: When magnetic field lines are denser in a region, it indicates a stronger magnetic field. This stronger field can exert a larger force on a charge moving in the region compared to other regions. †Answer: Answer: D. it can exert a larger force on a charge moving in the region than in the other regions.

Step 3: For question 59, let's analyze the options: A. The magnetic field produced by the solenoid is proportional to N/L. B. The magnetic field is uniform outside the coils and negligible inside the coils. C. The magnetic field is uniform inside and outside the coils and directs to the y-axis. D. The magnetic field is negligible outside the coils and uniform inside the coils.

Explanation: The magnetic field produced by a solenoid is uniform inside the coils and negligible outside the coils. †Answer: Answer: B. The magnetic field is uniform outside the coils and negligible inside the coils.

Step 4: For question 60, let's analyze the statement: Faraday’s law of electromagnetic induction states that:

A. The direction of the induced electromotive force is such that to oppose the change creating it. B. The magnitude of the induced electromotive force equals the rate change of the magnetic field. C. The magnitude of the induced electromotive force is proportional to the rate change of magnetic flux. D. The direction of the induced electromotive force is such that to enhance the change creating it.

Explanation: Faraday’s law of electromagnetic induction states that the magnitude of the induced electromotive force is proportional to the rate change of magnetic flux. †Answer: Answer: C. The magnitude of the induced electromotive force is proportional to the rate change of magnetic flux.