Class 10 Science Magnetic Effects of Electric Current Fill in the blanks , Multiple Choice Question [mcq] and True false .
Fill in the Blanks
1. A compass needle is a small magnet with its north pole pointing towards the ________ direction.
Answer: north
2. The region around a magnet where its influence can be detected is called the ________.
Answer: magnetic field
3. Magnetic field lines emerge from the ________ pole and merge at the ________ pole.
Answer: north, south
4. The direction of the magnetic field around a current-carrying conductor can be determined using the ________ rule.
Answer: right-hand thumb
5. The strength of the magnetic field inside a solenoid is ________.
Answer: uniform
6. A coil of many circular turns of insulated copper wire wrapped in the shape of a cylinder is called a ________.
Answer: solenoid
7. The force acting on a current-carrying conductor in a magnetic field is determined by ________ rule.
Answer: Fleming’s left-hand
8. The potential difference between live and neutral wires in Indian households is ________ volts.
Answer: 220
9. The earth wire has ________ insulation colour.
Answer: green
10. A device that prevents damage due to overloading in a circuit is called a ________.
Answer: fuse
11. The magnetic field lines due to a straight current-carrying wire are ________ circles.
Answer: concentric
12. The direction of the magnetic field inside a solenoid is from the ________ pole to the ________ pole.
Answer: south, north
13. The deflection of a compass needle near a current-carrying wire proves that electricity and ________ are related.
Answer: magnetism
14. An electromagnet is made by placing a ________ core inside a current-carrying solenoid.
Answer: soft iron
15. Short-circuiting occurs when the live wire and the ________ wire come into direct contact.
Answer: neutral
Multiple Choice Questions (MCQs)
1. The magnetic field lines around a bar magnet:
(a) Start from the north pole and end at the south pole
(b) Start from the south pole and end at the north pole
(c) Are circular with no definite direction
(d) Cross each other near the poles
Answer: (a)
2. The direction of the magnetic field around a straight current-carrying conductor is given by:
(a) Fleming’s left-hand rule
(b) Right-hand thumb rule
(c) Maxwell’s corkscrew rule
(d) Both (b) and (c)
Answer: (d)
3. The magnetic field inside a long current-carrying solenoid is:
(a) Zero
(b) Non-uniform
(c) Strongest near the ends
(d) Uniform
Answer: (d)
4. The force on a current-carrying conductor in a magnetic field is maximum when the angle between the current and the field is:
(a) 0°
(b) 45°
(c) 90°
(d) 180°
Answer: (c)
5. Which of the following is not a property of magnetic field lines?
(a) They never intersect
(b) They are closed curves
(c) They originate from the south pole
(d) They are crowded where the field is strong
Answer: (c)
6. The purpose of an earth wire is to:
(a) Provide a return path for current
(b) Prevent electric shocks
(c) Increase the voltage supply
(d) Reduce power consumption
Answer: (b)
7. A fuse is used in an electric circuit to:
(a) Increase current flow
(b) Prevent short-circuiting
(c) Reduce resistance
(d) Measure voltage
Answer: (b)
8. The magnetic field produced by a current-carrying circular loop at its centre is:
(a) Parallel to the plane of the loop
(b) Perpendicular to the plane of the loop
(c) Circular in shape
(d) Zero
Answer: (b)
9. The direction of force on an electron moving in a magnetic field is given by:
(a) Fleming’s right-hand rule
(b) Right-hand thumb rule
(c) Fleming’s left-hand rule
(d) Maxwell’s corkscrew rule
Answer: (c)
10. The colour of insulation for a live wire in domestic wiring is:
(a) Red
(b) Black
(c) Green
(d) Yellow
Answer: (a)
11. Which scientist discovered the magnetic effect of electric current?
(a) Faraday
(b) Oersted
(c) Ampere
(d) Maxwell
Answer: (b)
12. The strength of the magnetic field due to a current-carrying conductor depends on:
(a) Current and distance from the conductor
(b) Length of the conductor
(c) Material of the conductor
(d) Temperature of the conductor
Answer: (a)
13. Overloading in a circuit occurs when:
(a) A fuse is used
(b) Too many appliances are connected
(c) The earth wire is disconnected
(d) The voltage decreases
Answer: (b)
14. The magnetic field lines inside a current-carrying solenoid are:
(a) Circular
(b) Parallel straight lines
(c) Radial
(d) Elliptical
Answer: (b)
15. MRI in medical science stands for:
(a) Magnetic Resonance Imaging
(b) Magnetic Radiation Induction
(c) Metal Resistance Indicator
(d) Magnetic Rotation Instrument
Answer: (a)
True or False
1. A compass needle points towards the geographic north due to Earth’s magnetic field.
Answer: True
2. Magnetic field lines intersect each other near the poles.
Answer: False
3. The direction of the magnetic field around a current-carrying conductor can be reversed by reversing the current.
Answer: True
4. The magnetic field inside a solenoid is zero.
Answer: False
5. The earth wire is used to provide a return path for current in normal operation.
Answer: False
6. Fleming’s left-hand rule is used to determine the direction of the magnetic field.
Answer: False
7. The strength of the magnetic field decreases as we move away from a current-carrying wire.
Answer: True
8. An electromagnet uses a soft iron core to strengthen the magnetic field.
Answer: True
9. The neutral wire in domestic wiring has red insulation.
Answer: False
10. Short-circuiting occurs when the live wire touches the earth wire.
Answer: False
11. The force on a current-carrying conductor in a magnetic field is always parallel to the field.
Answer: False
12. MRI scans use the magnetic field produced by the human body.
Answer: True
13. The right-hand thumb rule is also called Maxwell’s corkscrew rule.
Answer: True
14. A fuse melts when the current exceeds its rated value.
Answer: True
15. The magnetic field lines due to a bar magnet are open curves.
Answer: False
