10TH CBSE SCIENCE magnetic effects 50 MCQS QUIZ

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Magnetic Effects of Electric Current

5 Theory-Based MCQ Tests • 10 Questions Each • 50 Questions

Instructions

• 5 separate tests, with 10 questions in each test.
• Only theory/concept-based questions from the uploaded source are included.
• Submit a test to see your score.
• Correct answers remain hidden until the password is entered.

Answer-reveal password is required after submission.

Test 1 — Magnetic Field & Field Lines

10 questions • 1 mark each

1. Magnetic field lines are:

A. Open curves B. Closed curves C. Straight rays only D. Random curves

2. The relative strength of a magnetic field is indicated by the:

A. Length of the magnet B. Degree of closeness of field lines C. Colour of field lines D. Number of poles

3. Magnetic field is a:

A. Scalar quantity B. Vector quantity C. Dimensionless quantity D. Constant only

4. The magnetic field around a long straight current-carrying wire has field lines in the form of:

A. Straight parallel lines B. Concentric circles centered on the wire C. Radial lines D. Ellipses

5. The magnetic field lines passing through the centre of a current-carrying circular loop are:

A. Circular B. Elliptical C. Straight D. Parabolic

6. Outside a bar magnet, magnetic field lines generally emerge from the:

A. South pole B. North pole C. Centre D. Both poles equally

7. Inside a magnet, magnetic field lines move from:

A. North to south B. South to north C. East to west D. West to east

8. If magnetic field lines are parallel and equally spaced, they represent a:

A. Zero magnetic field B. Uniform magnetic field C. Weak magnetic field only D. Changing magnetic field

9. Magnetic field lines do not:

A. Form closed curves B. Show field direction C. Intersect each other D. Represent field strength

10. The magnetic field produced by a current-carrying straight conductor is:

A. Parallel to the conductor B. Circular around the conductor C. Always zero D. Directed along the current

Correct answers are locked.

Test 2 — Current, Solenoid & Electromagnet

10 questions • 1 mark each

1. A solenoid is a:

A. Single straight wire B. Cylindrical coil with many close turns C. Permanent magnet only D. Metal plate

2. The magnetic field inside a long current-carrying solenoid is:

A. Zero at all points B. Nearly uniform C. Always circular D. Strongest only outside

3. Inside a long solenoid, magnetic field lines are:

A. Parallel straight lines B. Concentric circles C. Random curves D. Radial lines

4. The magnetic field inside a long solenoid depends on the number of:

A. Batteries only B. Turns per unit length C. Switches D. Insulators

5. Crowding the turns of a solenoid more closely generally makes its magnetic field:

A. Stronger B. Weaker C. Zero D. Unchanged in every case

6. A solenoid with a soft iron core is called an:

A. Insulator B. Electromagnet C. Ammeter D. Generator

7. The most suitable core material for an electromagnet according to the source is:

A. Soft iron B. Brass C. Aluminium D. Wood

8. When a soft iron bar is inserted into a current-carrying solenoid, the magnetic field inside it:

A. Decreases B. Increases C. Becomes zero D. Does not exist

9. A freely suspended current-carrying solenoid rests approximately in the:

A. East-west direction B. North-south direction C. Vertical direction only D. Random direction

10. If the direction of current through a solenoid is reversed, its:

A. Length changes B. N and S poles exchange positions C. Number of turns changes D. Core disappears

Correct answers are locked.

Test 3 — Fleming Rules & Force on Current

10 questions • 1 mark each

1. Fleming's right-hand rule gives the direction of:

A. Induced current B. Resistance C. Magnetic field strength D. Electric power

2. In Fleming's left-hand rule, the forefinger represents the direction of:

A. Current B. Magnetic field C. Force D. Voltage

3. In Fleming's left-hand rule, the middle finger represents the direction of:

A. Magnetic field B. Current C. Force D. Resistance

4. In Fleming's left-hand rule, the thumb represents the direction of:

A. Magnetic field B. Current C. Force or motion D. Charge

5. A magnetic field can exert a force on a:

A. Stationary electric charge B. Moving electric charge C. Charge with no motion only D. Neutral insulator only

6. A stationary electric charge in a magnetic field experiences:

A. Maximum magnetic force B. No magnetic force C. A force along the field D. A force opposite the field

7. Two parallel current-carrying conductors carrying currents in the same direction:

A. Repel each other B. Attract each other C. Have no interaction D. Always rotate

8. A current-carrying wire placed in a magnetic field can experience a force because of the interaction between:

A. Two electric circuits only B. The magnetic fields involved C. Heat and light D. Resistance and voltage

9. A current-carrying coil placed in a magnetic field can experience a:

A. Turning effect B. Chemical reaction only C. Change in mass D. Loss of charge

10. The turning effect of a current-carrying coil is utilized in a:

A. D.C. motor B. Fuse C. Ammeter only D. Insulator

Correct answers are locked.

Test 4 — Electromagnetic Induction, Motor & Generator

10 questions • 1 mark each

1. The production of electricity from magnetism is called:

A. Electromagnetic induction B. Electroplating C. Electrolysis D. Magnetic insulation

2. According to the source, electromagnetic induction occurs when there is a change in:

A. Mass of a magnet B. Magnetic flux linked with a coil C. Colour of a wire D. Resistance of air

3. A device used for producing electric current is called a:

A. Motor B. Generator C. Voltmeter D. Fuse

4. An electric motor converts:

A. Electrical energy into mechanical energy B. Mechanical energy into electrical energy C. Heat into electrical energy D. Light into sound

5. A generator is used to produce:

A. Only mechanical energy B. Electric current C. Only heat D. Only magnetic material

6. A pair of slip rings is used in an:

A. A.C. generator B. D.C. generator C. Fuse D. Electromagnet

7. In an electric motor, the direction of current in the coil changes once in each:

A. Complete rotation B. Half rotation C. Two rotations D. Four rotations

8. Commercial electric motors use an electromagnet rather than a:

A. Permanent magnet B. Copper wire C. Soft iron core D. Current-carrying coil

9. A current-carrying coil experiences a turning effect in a magnetic field; this principle is used by a:

A. D.C. motor B. Thermometer C. Fuse D. Transformer only

10. Magnets and electric current are related because:

A. Current can produce magnetism and changing magnetic conditions can induce current B. They are completely unrelated C. Magnets cannot affect electrical circuits D. Current can never produce a magnetic field

Correct answers are locked.

Test 5 — Domestic Electricity & Safety

10 questions • 1 mark each

1. Domestic electrical appliances are generally connected in:

A. Series B. Parallel C. A single open circuit D. Only mixed circuits

2. One major advantage of parallel connection in domestic circuits is that:

A. All appliances must stop together B. Each appliance can operate independently C. All appliances receive zero voltage D. Current is always identical in every appliance

3. In a domestic parallel circuit, each appliance receives the:

A. Same supply voltage B. Same resistance C. Same current in every case D. Same power in every case

4. The wire generally used as the earth wire in the source is:

A. Green B. Red C. Black only D. Brown only

5. The neutral wire is described in the source as being at approximately:

A. 220 V B. 0 V C. 110 V D. 50 V

6. The most important safety method listed for protecting home appliances from short-circuiting or overloading is the use of a:

A. Fuse B. Voltmeter C. Generator D. Motor

7. A fuse protects a circuit mainly by:

A. Increasing the current B. Melting and breaking the circuit when current becomes excessive C. Producing magnetic field only D. Increasing the voltage

8. Switches, fuses and circuit breakers should be placed in the:

A. Neutral wire B. Live wire C. Earth only D. Insulating covering

9. An MCB used in domestic wiring is designed to cut off supply during:

A. Normal operation only B. Short-circuiting or overloading C. Low temperature D. Magnetic field measurement

10. The AC mains frequency in India given in the source is:

A. 25 Hz B. 50 Hz C. 60 Hz D. 100 Hz

Correct answers are locked.