LUMS LCAT Physics: Most Important MCQs with Answers

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Sample LUMS LCAT Physics most important questions

1. Q1. 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

2. Q2. 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

3. Q3. A thermodynamic system undergoes a process in which its internal energy decreases by 500 J. If the work done by the system is 750 J, the heat transferred to the system is

   • A) -1250 J
   • B) 250 J
   • C) -250 J
   • D) 1250 J

   Answer: 250 J

4. Q4. A spring has a spring constant of 100 N/m. What is the work done in compressing it by 2 m?

   • A) 100 J
   • B) 200 J
   • C) 2000 J
   • D) 400 J

   Answer: 200 J

5. Q5. A body of mass 5 kg is lifted to a height of 10 m. What is the potential energy gained?

   • A) 490 J
   • B) 500 J
   • C) 4905 J
   • D) 5000 J

   Answer: 490 J

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