Physics · Class 10 CBSE
A student places a compass near a straight current-carrying wire. The compass needle deflects. What does this observation prove?
A current-carrying straight conductor is held vertically. If the current flows upward, in which direction do the magnetic field lines circulate?
Which change will increase the strength of the magnetic field around a current-carrying straight conductor?
An electrician wraps insulated copper wire around a soft iron core and passes electric current through it. The arrangement behaves like a:
A current-carrying conductor placed in a magnetic field experiences a force. Which rule is used to determine the direction of this force?
Which device works mainly on the principle of the motor effect?
In an electric generator, electrical energy is produced by:
A student notices that the fuse in a circuit melts repeatedly. Which safety device should also be checked because it protects against excessive current and short circuits?
Why is the earth wire connected to the metal body of electrical appliances?
Which statement correctly distinguishes an electric motor from an electric generator?
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State the Right-Hand Thumb Rule. How does it help determine the direction of the magnetic field around a straight conductor?
2 marksWhy is soft iron used as the core of an electromagnet instead of steel?
2 marksDifferentiate between an electric motor and an electric generator based on: - Energy conversion - Principle of working
2 marksWhy are household electrical appliances connected using a three-pin plug?
2 marksA student accidentally touches the metal body of a faulty electric iron. Explain how proper earthing helps prevent electric shock.
2 marksExplain the construction and working of an electric motor. Include: - Armature (coil) - Split-ring commutator - Carbon brushes - Magnetic field - Principle involved - Two practical applications
5 marksExplain the construction and working of an electric generator. In your answer, include: - Principle of electromagnetic induction - Fleming\'s Right-Hand Rule - AC generator - Difference between AC and DC
5 marksCase study: During a school exhibition, students prepared two working models. One model demonstrated an electric motor lifting a small weight, while the other showed a generator producing electricity by rotating a coil using a hand crank. Their teacher also explained the importance of earthing and MCBs in household wiring. Answer the following questions: (a) Which model converts electrical energy into mechanical energy?
1 markCase study: During a school exhibition, students prepared two working models. One model demonstrated an electric motor lifting a small weight, while the other showed a generator producing electricity by rotating a coil using a hand crank. Their teacher also explained the importance of earthing and MCBs in household wiring. Answer the following questions: (b) What is the main principle behind the working of an electric generator?
1 markCase study: During a school exhibition, students prepared two working models. One model demonstrated an electric motor lifting a small weight, while the other showed a generator producing electricity by rotating a coil using a hand crank. Their teacher also explained the importance of earthing and MCBs in household wiring. Answer the following questions: (c) Why is earthing necessary for appliances such as refrigerators and washing machines?
1 markCase study: During a school exhibition, students prepared two working models. One model demonstrated an electric motor lifting a small weight, while the other showed a generator producing electricity by rotating a coil using a hand crank. Their teacher also explained the importance of earthing and MCBs in household wiring. Answer the following questions: (d) What is the function of an MCB in a household electric circuit?
1 mark