Physics Practice: Electricity and Magnetism (Mock Test 3 - Advanced)
1. A wire of resistance $10\ \Omega$ is stretched to double its length. Its new resistance will be:
2. When three resistors of $3\ \Omega$ each are connected in parallel, the effective resistance is:
3. The magnetic field lines inside a bar magnet run from:
4. Which of the following does NOT affect the strength of an electromagnet?
5. "Magnetic Saturation" refers to the state where:
6. If $2\text{ A}$ of current flows through a $5\ \Omega$ resistor for $10\text{ seconds}$, the heat produced is:
7. The primary reason for using a Soft Iron core in an electromagnet is its:
8. In a "Step-up Transformer," the number of turns in the secondary coil is ________ than the primary coil.
9. Which of the following describes the Earth's magnetic field accurately?
10. An electric toaster rated $1100\text{ W}$ is used for $10\text{ minutes}$. The energy consumed in $kWh$ is:
11. A fuse is always connected in ________ with the ________ wire.
12. Which magnetic property is used to store data on computer hard drives?
13. The voltage used in Indian domestic circuits is ________ at ________ frequency.
14. To protect a sensitive instrument from external magnetic fields, we place it inside a box made of:
15. The "Neutral Point" in a magnetic field is a point where the net magnetic field is ________.