12th Physics one mark questions PDF

In this article, we have compiled a comprehensive set of one-mark questions and answers for 12th-grade Physics students. These questions are helpful for quick revision and understanding of key concepts. Whether preparing for exams or seeking clarity on fundamental topics, this resource serves as a valuable guide for all learners. The questions cover a wide range of topics, ensuring you have a well-rounded understanding of the subject. The answers are brief yet detailed enough to provide insight into each concept. Use this as a helpful tool to boost your preparation and strengthen your knowledge of Physics.

Question 1
Question: What is the unit of electric current?
Answer: The unit of electric current is the Ampere (A).

Question 2
Question: What is Ohm’s Law?
Answer: Ohm’s Law states that the current through a conductor is directly proportional to the voltage across it, provided the temperature remains constant.

Question 3
Question: Define potential difference.
Answer: Potential difference is the work done to move a unit charge from one point to another in an electric field. Its unit is the Volt (V).

Question 4
Question: What is the SI unit of power?
Answer: The SI unit of power is the Watt (W).

Question 5
Question: What is meant by electric field?
Answer: An electric field is a region around a charged particle where a force is exerted on other charged particles.

Question 6
Question: What is a conductor?
Answer: A conductor is a material that allows the flow of electric current, such as metals.

Question 7
Question: What is the difference between AC and DC?
Answer: AC (Alternating Current) changes direction periodically, while DC (Direct Current) flows in one direction only.

Question 8
Question: What is the formula for the capacitance of a parallel plate capacitor?
Answer: The formula for capacitance is C = ε₀(A/d), where ε₀ is the permittivity of free space, A is the area of the plates, and d is the distance between them.

Question 9
Question: What is a magnetic field?
Answer: A magnetic field is a region around a magnet where magnetic forces can be felt.

Question 10
Question: What is Fleming’s Left Hand Rule?
Answer: Fleming’s Left Hand Rule is used to determine the direction of motion of a conductor in a magnetic field, where the thumb represents the force, the index finger represents the magnetic field, and the middle finger represents the current.

Question 11
Question: What is the principle of a transformer?
Answer: The principle of a transformer is based on electromagnetic induction, where a change in the magnetic field induces a voltage in a coil of wire.

Question 12
Question: What is the unit of magnetic field strength?
Answer: The unit of magnetic field strength is the Tesla (T).

Question 13
Question: Define the term “specific heat”.
Answer: Specific heat is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius.

Question 14
Question: What is the SI unit of energy?
Answer: The SI unit of energy is the Joule (J).

Question 15
Question: What is the difference between speed and velocity?
Answer: Speed is the distance traveled per unit of time, while velocity is the displacement per unit of time, which has both magnitude and direction.

Question 16
Question: What is acceleration?
Answer: Acceleration is the rate of change of velocity with respect to time.

Question 17
Question: What is Newton’s first law of motion?
Answer: Newton’s first law of motion states that an object will remain at rest or move at a constant velocity unless acted upon by an external force.

Question 18
Question: What is centripetal force?
Answer: Centripetal force is the force that acts on an object moving in a circular path, directed towards the center of the circle.

Question 19
Question: What is the law of conservation of momentum?
Answer: The law of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it.

Question 20
Question: What is the work-energy theorem?
Answer: The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.

The questions and answers provided in this article cover fundamental concepts of Physics that are crucial for your exam preparation. They not only serve as quick revision material but also aid in building a deeper understanding of essential topics. Keep practicing and reviewing these questions to ensure that you are well-prepared for your exams.