This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 33 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 33 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the current through a 11V bulb with a power of 99W? A) Swine. B) P. C) 60V. D) 60A. Show Answer Correct Answer: B) P. 2. If the number of turns in a coil is increased then the magnetic field produced by it will: A) Increase. B) Decrease. C) Remains unchanged. D) None of these. Show Answer Correct Answer: A) Increase. 3. An electric current that has constant magnitude and direction over time is known as a(n) A) Direct current. B) Alternating current. C) Simple current. D) None of the above. Show Answer Correct Answer: A) Direct current. 4. On what principle is electric bell based? A) Heating effect of current. B) Magnetic effect of current. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnetic effect of current. 5. Polythene is A) A conductor. B) An insulator. C) Semi conductor. D) None of these. Show Answer Correct Answer: B) An insulator. 6. The combination of two or more cells is known as:- A) Battery. B) MCB. C) Cell. D) None of these. Show Answer Correct Answer: A) Battery. 7. The thicker wire has low resistance because ..... electric charges can flow through it. A) Same number. B) Less. C) More. D) None of the above. Show Answer Correct Answer: C) More. 8. Which among the following is the disadvantage of heating effect of current? A) 1.It can break the insulation of wires/ devices. B) 2.It prevents energy loss. C) 3.It is used in working of electric fuse. D) None of the above. Show Answer Correct Answer: A) 1.It can break the insulation of wires/ devices. 9. Electric current that flows in only one direction. A) Voltage. B) Direct Current. C) Alternating Current. D) Series Circuit. Show Answer Correct Answer: B) Direct Current. 10. Rajan made an electromagnet by winding 50 turns of the wire over an iron screw. Priya also made an electromagnet by winding 100 turns of the wire over an iron screw. which electromagnet will attract more pins? A) Rajan's Electromagnet. B) Priya's Electromagnet. C) Both attract same number of pins. D) None of the above. Show Answer Correct Answer: B) Priya's Electromagnet. 11. If current is passed in a spring with a weight hung on it, then the spring A) Will be compressed. B) Will expand. C) Compression and expansion both will occur. D) No change in the state of the spring. Show Answer Correct Answer: A) Will be compressed. 12. The front face of a circular coil carrying current behaves like a North pole. The direction of current in the face of the circular coil is: A) Anti-clockwise. B) Clockwise. C) Downwards. D) Upwards. Show Answer Correct Answer: C) Downwards. 13. A circuit consists of a 12 V battery connected across a single resistor. If the current in the circuit is 3 A, calculate the size of the resistor. A) 36 ohms. B) 0.25 ohms. C) 4 ohms. D) 12 ohms. Show Answer Correct Answer: C) 4 ohms. 14. Electric cell has A) +ve and-ve terminal. B) Chemicals. C) Wire. D) Both A and B. Show Answer Correct Answer: D) Both A and B. 15. Resistance is ..... A) What "slows down" electrons. B) What "speeds up" electrons. C) Moving electrons. D) What "pushes" electrons. Show Answer Correct Answer: A) What "slows down" electrons. 16. What is the SI unit of magnetic field strength? A) Ampere. B) Weber. C) Tesla. D) Coulomb. Show Answer Correct Answer: C) Tesla. 17. Which of these will conduct electricity A) Tap water. B) Distilled water. C) All the above. D) None of the above. Show Answer Correct Answer: A) Tap water. 18. Approximate the instantaneous current of the function at x =-1. $q\left(x\right)=3x^2+2x-1$ A) -4. B) -1/4. C) 3. D) -2. Show Answer Correct Answer: A) -4. 19. '+' is the ..... sign whereas '-' is the ..... sign. A) Negative, positive. B) Positive, negative. C) All the above. D) None of the above. Show Answer Correct Answer: B) Positive, negative. 20. The filament of A bulb, is a wire of A) High resistivity, low melting point. B) Low resistivity, low melting point. C) High resistivity, high melting point. D) Low resistivity, high melting point. Show Answer Correct Answer: C) High resistivity, high melting point. 21. We describe the flow of electricity as being: A) In reverse. B) Fast. C) Clockwise. D) None of the above. Show Answer Correct Answer: A) In reverse. 22. *While performing a activity on electromagnet, it is observed that when the electric current is switched off, the nail looses its magnetism. Is this statement true or false? A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 23. Electric Potential ..... as distance increases A) Increases. B) Decreases. C) Becomes zero. D) Remains constant. Show Answer Correct Answer: B) Decreases. 24. Which of the following is the best example of an electrical conductor? A) Tire. B) Steel. C) Plastic. D) None of the above. Show Answer Correct Answer: B) Steel. 25. The switch that automatically stops the current in a circuit if the current exceeds the specified limit, is knows as A) FUSE. B) SWITCH. C) MCB. D) SHORT CIRCUIT. Show Answer Correct Answer: C) MCB. ← PreviousNext →Related QuizzesClass 7 Science Chapter 10 Electric Current And Its Effects Quiz 1Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 2Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 4Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 5Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 6Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books