LUMS LCAT Physics: Practice MCQs with Answers

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Sample LUMS LCAT Physics practice questions

1. Q1. The current in an AC circuit is given by I = 10 sin(100t). The frequency is

   • A) 50 / π Hz
   • B) 100 / (2π) Hz
   • C) 50 Hz
   • D) 100 Hz

   Answer: 50 / π Hz

2. Q2. A series LCR circuit has R = 10 ohm, L = 0.1 H, and C = 100 μF. If the frequency of the AC source is 50 Hz, what is the impedance?

   • A) 17.9 ohm
   • B) 14.1 ohm
   • C) 20 ohm
   • D) 10 ohm

   Answer: 10 ohm

3. Q3. In an AC circuit, the voltage is given by V = 200 sin(100πt) and the current is given by I = 10 sin(100πt + π/3). What is the power factor?

   • A) 0.5
   • B) 0.866
   • C) 1
   • D) 0

   Answer: 0.5

4. Q4. A rectangular coil of 100 turns, area 0.1 m², is rotated at 50 rev/s in a magnetic field of 0.01 T. Maximum induced emf is

   • A) 10π V
   • B) 20π V
   • C) 30π V
   • D) 40π V

   Answer: 10π V

5. Q5. A circular coil of radius 0.1 m is placed in a uniform magnetic field of 0.2 T. If it's rotated by 180° in 0.2 s, find induced emf.

   • A) 0.0628 V
   • B) 0.1256 V
   • C) 0.628 V
   • D) 1.256 V

   Answer: 0.0628 V

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