Q. A gas expands isothermally at 300 K from a volume of 1 m³ to 2 m³. If the pressure at the initial state is 100 kPa, what is the work done by the gas?
Q. A gas is compressed isothermally from a volume of 4 L to 1 L at a constant temperature of 300 K. If the initial pressure is 1 atm, what is the final pressure?
A.
4 atm
B.
3 atm
C.
2 atm
D.
1 atm
Solution
Using Boyle's Law, P1V1 = P2V2, we find P2 = P1 * (V1/V2) = 1 atm * (4 L / 1 L) = 4 atm.
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced current as the loop enters the magnetic field? (2023)
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
Solution
As the loop enters the magnetic field, the change in magnetic flux increases, leading to an increase in the induced current.
Q. A loop of wire is placed in a uniform magnetic field. If the magnetic field is increased uniformly, what happens to the induced current in the loop?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
Solution
According to Faraday's law, an increase in magnetic field through the loop induces a current in the loop, which increases as the rate of change of magnetic flux increases.
Q. A loop of wire is rotated in a uniform magnetic field. What is the effect on the induced current? (2019)
A.
It remains constant
B.
It reverses direction
C.
It increases
D.
It decreases
Solution
As the loop rotates, the angle between the magnetic field and the normal to the loop changes, which causes the direction of the induced current to reverse periodically.
Q. A magnetic field is directed into the plane of the paper. If a positive charge moves to the right, what is the direction of the magnetic force acting on it? (2021)
A.
Upwards
B.
Downwards
C.
To the left
D.
To the right
Solution
Using the right-hand rule, if the magnetic field is into the paper and the charge moves to the right, the force will be upwards.
Q. A metal rod is heated at one end. If the temperature at the heated end is 100°C and the other end is at 20°C, what is the temperature gradient along the rod?
A.
80°C/m
B.
20°C/m
C.
10°C/m
D.
5°C/m
Solution
Temperature gradient = (T_hot - T_cold) / Length. Assuming length is 8 m, gradient = (100°C - 20°C) / 8 m = 10°C/m.
Q. A metal rod of length 1 m and cross-sectional area 1 cm² is heated at one end. If the temperature difference between the ends is 100°C, what is the rate of heat transfer through the rod? (Thermal conductivity of the metal = 200 W/m°C)
A.
200 W
B.
400 W
C.
600 W
D.
800 W
Solution
Using Fourier's law: Q/t = kA(ΔT/L) = 200 W/m°C * 0.0001 m² * (100°C/1 m) = 200 W.
Physics is a crucial subject for students preparing for the MHT-CET exam, as it forms the foundation for many scientific concepts. Mastering Physics through MCQs and objective questions not only enhances your understanding but also significantly boosts your exam scores. Regular practice with these questions helps you identify important topics and improves your problem-solving skills, making it an essential part of your exam preparation.
What You Will Practise Here
Mechanics: Laws of Motion, Work, Energy, and Power
Thermodynamics: Laws, Heat Transfer, and Applications
Waves and Oscillations: Types of Waves, Sound Waves, and Properties
Optics: Reflection, Refraction, and Optical Instruments
Electromagnetism: Electric Fields, Magnetic Fields, and Circuits
Modern Physics: Quantum Theory, Atomic Structure, and Nuclear Physics
Key Formulas and Definitions: Essential for quick revisions
Exam Relevance
Physics is a significant component of various examinations including CBSE, State Boards, NEET, and JEE. In these exams, questions often focus on conceptual understanding and application of theories. Common patterns include numerical problems, conceptual MCQs, and application-based questions that test your grasp of fundamental principles. Familiarity with these patterns through practice will enhance your confidence and performance on exam day.
Common Mistakes Students Make
Misunderstanding the application of formulas in different contexts.
Overlooking units and dimensions, leading to incorrect answers.
Confusing similar concepts, such as velocity and acceleration.
Neglecting to read questions carefully, resulting in misinterpretation.
Rushing through calculations without checking for errors.
FAQs
Question: What are the best ways to prepare for Physics (MHT-CET) MCQs? Answer: Regular practice with previous years' question papers and mock tests, along with a focus on understanding concepts, is key to success.
Question: How can I improve my speed in solving Physics MCQs? Answer: Time yourself while practicing and focus on solving simpler questions first to build confidence and speed.
Start your journey towards mastering Physics today! Solve practice MCQs and test your understanding to ensure you are well-prepared for the MHT-CET exam. Your success in Physics is just a question away!
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