Electric Current and its Effects MCQ Class 7

Correct Answer: A. Electric Current. It is the flow of electric charge(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Amperes. It is the standard unit for measuring electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Rubber. It is an insulator, which means it resists the flow of electricity(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Conductor. It is a material that allows electricity to flow through it easily(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Static Electricity. It is the buildup of electric charge on a surface(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Electric Voltage. It is the force that causes electrons to flow in a circuit(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Electric Resistance. It is the opposition to the flow of electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Electrical Energy. It is the energy that an electric current carries(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Load. It is a device that converts electrical energy into other forms of energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Switch. It is a device that controls the flow of electric current in a circuit(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Circuit. It is a complete path through which electric current can flow(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Series Circuit. It is a circuit in which the current flows in a single, continuous loop(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Parallel Circuit. It is a circuit in which the current divides into two or more paths(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Parallel Circuit. It is the type of circuit commonly used in household wiring(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Open Circuit. It is a circuit in which there is a break in the path, preventing the flow of current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Closed Circuit. It is a circuit in which the current can flow through a complete path(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Battery. It is a device that converts chemical energy into electrical energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Solar Cell. It is a device that converts light energy into electrical energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Light Bulb. It is a device that converts electrical energy into light energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Speaker. It is a device that converts electrical energy into sound energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. It gets hot. This is known as the heating effect of electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Electric Heater. It uses the heating effect of electric current to produce heat(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Element. It is the wire inside an electric heater that gets hot(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Fuse. It is a safety device that uses the heating effect of electric current to protect circuits from overloading(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. It melts and breaks the circuit. This is how a fuse protects the circuit from overloading(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Circuit Breaker. It is a reusable safety device that can be used in place of a fuse(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Electric Motor. It uses the magnetic effect of electric current, not the heating effect(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Conduction. It is the process of transferring heat from one object to another through direct contact(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Convection. It is the process of transferring heat through the movement of fluids(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Radiation. It is the process of transferring heat through electromagnetic waves(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Wood. It is an insulator, which means it resists the flow of heat(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Insulator. It is a material that prevents the transfer of heat(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Specific Heat Capacity. It is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Latent Heat. It is the amount of heat required to change the state of a substance without changing its temperature(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Thermal Conductivity. It is the rate at which heat is transferred through a material(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Metal. It is a good conductor of heat(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Air. It is a good insulator of heat(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Electric Welding. It is the process of using the heating effect of electric current to join two pieces of metal together(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Electric Arc Cutter. It is the device that uses the heating effect of electric current to cut through metal(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Electric Casting. It is the process of using the heating effect of electric current to melt and shape metal(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. It creates a magnetic field around the wire. This is known as the magnetic effect of electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Hans Christian Oersted. He discovered the relationship between electricity and magnetism in 1820(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Oersted’s Experiment. It demonstrates the magnetic effect of electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. It deflects. This is because the electric current creates a magnetic field that interacts with the compass needle(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Solenoid. It is a coil of wire that produces a magnetic field when an electric current flows through it(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Electric Motor. It uses the magnetic effect of electric current to convert electrical energy into mechanical energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Electric Generator. It uses the magnetic effect of electric current to convert mechanical energy into electrical energy(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Electric Transformer. It uses the magnetic effect of electric current to increase or decrease the voltage of an alternating current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Electric Heater. It uses the heating effect of electric current, not the magnetic effect(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Magnetic Force. It is the force of attraction or repulsion between two magnets(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Magnetic Field. It is the region around a magnet where magnetic forces can be detected(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Magnetic Field Lines. They are used to represent a magnetic field(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. From North Pole to South Pole. This is the convention used to represent the direction of magnetic field lines(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. From South Pole to North Pole. Magnetic field lines form continuous loops(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Ferromagnetic Material. It is strongly attracted to a magnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Iron. It is a ferromagnetic material(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Paramagnetic Material. It is weakly attracted to a magnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Diamagnetic Material. It is weakly repelled by a magnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Plastic. It is not a magnetic material(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Geomagnetic Field. It is the Earth’s magnetic field(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Electromagnet. It is a magnet that is created by an electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. By passing an electric current through a coil of wire. This creates a magnetic field around the coil, turning it into an electromagnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: C. Iron. It is often used as the core of an electromagnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. It loses its magnetism. This is because the magnetic field is created by the electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. It is a permanent magnet. Electromagnets are temporary magnets(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. All of the above. These factors can increase the strength of an electromagnet(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. By reversing the direction of the current flowing through the coil. This reverses the direction of the magnetic field(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Electric Heater. It uses the heating effect of electric current, not electromagnets(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Electric Crane. It uses an electromagnet to lift heavy objects(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Hard Disk Drive. It uses an electromagnet to store data(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Tape Drive. It uses an electromagnet to read and write data on a magnetic tape(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Magnetic Separator. It uses an electromagnet to separate magnetic materials from non-magnetic materials(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Relay. It uses an electromagnet to control the flow of electric current in a circuit(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Loudspeaker. It uses an electromagnet to produce sound(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Telephone. It uses an electromagnet to convert electrical signals into sound waves(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Generator. It uses an electromagnet to generate electricity(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Galvanometer. It uses an electromagnet to move a pointer or needle(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Ammeter. It uses an electromagnet to measure electric current(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Voltmeter. It uses an electromagnet to measure voltage(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Ohmmeter. It uses an electromagnet to measure resistance(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. Magnetic effect of electric current. An electric bell uses an electromagnet to move a hammer(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. The circuit is completed and current flows through the electromagnet. This is the first step in the working of an electric bell(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. To attract the hammer towards the gong. The electromagnet becomes magnetized when the current flows through it(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. The circuit is broken. This is because the hammer moves away from the contact screw(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. The repeated making and breaking of the circuit. This causes the hammer to strike the gong repeatedly(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. Fuse. While a fuse is a safety device in electrical circuits, it’s not a specific component of an electric bell(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. To complete the circuit. The hammer touches the contact screw, allowing the current to flow(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. To pull the hammer back after it strikes the gong. This allows the circuit to be completed again(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. Metal. It needs to be a material that can vibrate and produce sound(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. The pitch of the sound becomes lower. Thicker materials vibrate slower, producing a lower pitch(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. To prevent it from becoming permanently magnetized. This ensures it returns to its original position when the current is off(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. The bell would not ring at all. The contact screw needs to be conductive to complete the circuit(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: B. By using a thinner gong. A thinner gong vibrates faster, producing a higher pitch(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. To adjust the distance between the hammer and the gong. This can affect the sound of the bell(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. All of the above. Electric bells offer several advantages over traditional bells(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. All of the above. Electric bells are widely used in various settings(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. All of the above. These are common issues that can affect the functioning of an electric bell(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: D. All of the above. These are steps to troubleshoot a malfunctioning electric bell(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. To prevent short circuits. Insulation prevents the current from flowing in unwanted paths(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).

Correct Answer: A. A larger electromagnet produces a louder sound. A stronger magnetic field can move the hammer with more force(Electric Current and its Effects MCQ Class 7 by Top100MCQ.com).