Oswaal Cbse Class 10 Science Question Bank 〈iPhone〉

Differentiate between an AC generator and a DC generator on the basis of: (i) Direction of current produced (ii) Use of slip rings / commutator (iii) Frequency of current 5. Case-Based / Source-Based Integrated Question – 4 Marks Read the following passage and answer the questions that follow: Magnetic Field due to a Solenoid: A solenoid is a long coil of insulated copper wire wound in the shape of a cylinder. When an electric current is passed through it, a magnetic field is produced inside the solenoid. This field is uniform and strong. The magnetic field lines inside the solenoid are parallel and straight, indicating a constant magnetic field. The solenoid behaves like a bar magnet, with one end acting as the north pole and the other as the south pole. The strength of the magnetic field can be increased by increasing the current or the number of turns per unit length. Q.13.1 What is the nature of the magnetic field inside a current-carrying solenoid? (1)

How can you identify the north and south poles of a solenoid without using a magnetic compass? (2) 6. Long Answer Question (LA) – 5 Marks Q.14 (a) State the principle of an electric generator. (b) Draw a neat labeled diagram of an AC generator. (c) Explain the role of the following in an AC generator: (i) Armature (ii) Brushes (iii) Slip rings (d) Why is alternating current preferred over direct current for long-distance transmission? Answer Key (For Quick Evaluation) | Q.No | Answer | |------|--------| | 1 | (b) Concentric circles | | 2 | (a) Bar magnet | | 3 | (c) Split rings | | 4 | (b) Thumb – Motion, Forefinger – Field, Middle finger – Current | | 5 | Electromagnet requires current; permanent magnet does not. | | 6 | Electric generator | | 7 | 0 Hz (DC has no frequency) | | 9 | Current produces magnetic field; Right-Hand Thumb Rule. | | 10 | Fleming’s Right-Hand Rule. | | 13.1 | Uniform and strong / parallel and straight. | | 13.2 | Current strength & number of turns per unit length. | | 14(d) | Less energy loss due to step-up/step-down transformers. | Oswaal cbse class 10 science question bank

Name two factors on which the strength of the magnetic field produced by a solenoid depends. (1) Differentiate between an AC generator and a DC

Which of the following correctly represents Fleming’s Left-Hand Rule? (a) Thumb – Current, Forefinger – Motion, Middle finger – Field (b) Thumb – Motion, Forefinger – Field, Middle finger – Current (c) Thumb – Field, Forefinger – Current, Middle finger – Motion (d) Thumb – Current, Forefinger – Field, Middle finger – Motion 2. Very Short Answer Questions (VSA) – 1 Mark each Q.5 State one difference between a permanent magnet and an electromagnet. Q.6 Name the device which converts mechanical energy into electrical energy. Q.7 What is the frequency of direct current (DC) in India? 3. Short Answer Questions Type I (SA-I) – 2 Marks each Q.8 Draw a labeled diagram to show the pattern of magnetic field lines around a current-carrying solenoid. Mark the north and south poles. This field is uniform and strong