This quiz works best with JavaScript enabled. Home > Class 10 > Class 10 Science Chapter 13 Magnetic Effects Of Electric Current – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If there are circular coil having n turns then the field produces is A) Field strength is proportional to the radius of the coil. B) Field strength is not affected by the number of turns (n). C) N times as large as that produced in single turn. D) Field strength is inversely proportional to the number of turns (n). Show Answer Correct Answer: C) N times as large as that produced in single turn. 2. What is the purpose of a commutator in an electric motor? A) To reverse the direction of flow of electric current. B) To increase the speed of the motor. C) To decrease the speed of the motor. D) To control the temperature of the motor. Show Answer Correct Answer: A) To reverse the direction of flow of electric current. 3. Overloading is due to A) Insulation of wire is damaged. B) Fault in the appliances. C) Accidental hike in supply voltage. D) All of the above. Show Answer Correct Answer: D) All of the above. 4. What is the polarity of a current carrying loop if the current is flowing in an anti-clockwise direction? A) North pole. B) South pole. C) No pole. D) Both north and south poles. Show Answer Correct Answer: A) North pole. 5. In which of the following devices DC motor is used? A) Fans. B) Washing machine. C) Refrigerator. D) Battery-operated toy. Show Answer Correct Answer: D) Battery-operated toy. 6. What is the pattern of magnetic field lines around a circular loop of wire? A) Concentric circles. B) No pattern. C) Straight lines. D) Radial lines. Show Answer Correct Answer: A) Concentric circles. 7. A plotting compass is placed near South pole of a bar magnet. The pointer of the platting compass will? A) Point away from the South pole. B) Point parallel from the South pole. C) Point towards the South pole. D) Point at right angles to the South pole. Show Answer Correct Answer: C) Point towards the South pole. 8. The magnetic field lines near a long straight wire carrying current are: A) Straight lines. B) Concentric rings. C) Spiral lines. D) Radial lines. Show Answer Correct Answer: B) Concentric rings. 9. The greater the number of windings (the number of times it is wrapped around) in an electromagnet's coil A) The stronger the magnet is. B) The less the magnet will pick up. C) The more current it takes to create the electromagnet. D) The slower the compass needle moves to the wire. Show Answer Correct Answer: A) The stronger the magnet is. 10. Which of the following is a non magnetic substance A) Iron. B) Cobalt. C) Nickel. D) Brass. Show Answer Correct Answer: B) Cobalt. 11. Magnetic field inside a long solenoid carrying current is A) Same at all points (uniform). B) Different at poles and at the centre. C) Zero. D) Different at all points. Show Answer Correct Answer: A) Same at all points (uniform). 12. Three resistors of 2.5 $\Omega$, 12 $\Omega$ and 3.5 $\Omega$ are connected in series. Which of the given single resistors can replace the three of them in a circuit? A) 16 oh. B) 4 oh. C) 18 $\Omega$. D) 8 oh. Show Answer Correct Answer: C) 18 $\Omega$. 13. Relative strength of magnetic field at a point in the space surrounding the magnet is shown by the A) Resistance offered by the surroundings. B) Degree of closeness of the field. C) Thickness of magnet. D) Length of magnet. Show Answer Correct Answer: B) Degree of closeness of the field. 14. What is that instrument which can detect the presence of electric current in a circuit? A) Galvanometer. B) Motor. C) Generator. D) None of above. Show Answer Correct Answer: A) Galvanometer. 15. A current carrying solenoid coil used to make A) Magnets. B) Electromagnets. C) Soft iron. D) None of the above. Show Answer Correct Answer: B) Electromagnets. 16. Imagine that you are holding a current-carrying straight conductor in your right hand such that the A) Thumb points towards the direction of current. B) Thumb points towards the direction of magnetic lines of force. C) Fingers will wrap around the conductor in the direction of the field of electric current. D) The magnetic field lines are closed curves. Show Answer Correct Answer: A) Thumb points towards the direction of current. 17. A solenoid is A) Aluminium wire in a shape of a cylinder. B) Copper wire in a shape of a cylinder. C) Silver wire in a shape of a cylinder. D) None of the above. Show Answer Correct Answer: B) Copper wire in a shape of a cylinder. 18. Which of the following is NOT a use of magnets? A) In refrigerators. B) In radio and stereo speakers. C) In audio and video cassette players. D) In mobile phones. Show Answer Correct Answer: D) In mobile phones. 19. To convert an AC generator into DC generator A) Split-ring type commutator must be used. B) Slip rings and brushes must be used. C) A stronger magnetic field has to be used. D) A rectangular wire loop has to be used. Show Answer Correct Answer: A) Split-ring type commutator must be used. 20. Which among of these are the main characteristics of fuse element? A) High conductivity. B) Low melting point. C) Do not bum due to oxidation. D) All of the above. Show Answer Correct Answer: D) All of the above. 21. According to Fleming's left-hand rule, what does the thumb represent? A) Direction of force. B) Direction of the magnetic field. C) Direction of current. D) Direction of voltage. Show Answer Correct Answer: A) Direction of force. 22. Which word means how hard it is for electrons to flow? A) Current. B) Voltage. C) Resistance. D) Power. Show Answer Correct Answer: C) Resistance. 23. You are given four bulbs of 25 W, 40 W, 50 W and 60 W. Which bulb has the lowest resistance? A) 25 w. B) 50 W. C) 60 W. D) 40 W. Show Answer Correct Answer: C) 60 W. 24. A compass needle gets deflected whenbrought near a bar magnet. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 25. An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on A) The speed with which the magnet is moved. B) The number of turns of the coil. C) The resistivity of the wire of the coil. D) The strength of the magnet. Show Answer Correct Answer: C) The resistivity of the wire of the coil. ← PreviousNext →Related QuizzesClass 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 1Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 2Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 3Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 4Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 5Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 6Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 8Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 9Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 10Class 10 Science Chapter 13 Magnetic Effects Of Electric Current Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books