CDS/CAPF 2025 Physics Unit and Measurement Notes PDF

# CDS/CAPF 2025 - Physics Lecture 03 - Unit and Measurement **By - Vikrant Pundir** ## Topics to be covered 1. Unit and Measurement * Remaining topics * Velocity, Acceleration, Speed * DPP Solutions * Questions 2. Dimensional Formula ## Contact Information * **Phone:** +91 74283...

# CDS/CAPF 2025 - Physics Lecture 03 - Unit and Measurement **By - Vikrant Pundir** ## Topics to be covered 1. Unit and Measurement * Remaining topics * Velocity, Acceleration, Speed * DPP Solutions * Questions 2. Dimensional Formula ## Contact Information * **Phone:** +91 74283 98763 * **Instagram:** @defencewallah_ * **Telegram:** @Defencewallahcds * **Telegram Channel:** https://t.me/Chemistrybyvikrantsir ## Question 1 A boy completes one round of a circular track of diameter 200m in 30s. What will be the displacement at the end of 3 minutes and 45 seconds? * (A) 50 m * (B) 100 m * (C) 200 m * (D) 236 m ## Question 2 An athlete completes one round of a circular track of diameter 100m in 20s. What will be the displacements after 1 minute and 10s, respectively? * (A) 0m, 50m * (B) 300m, 100m * (C) 300m, 50m * (D) 0m, 100m ## Question 3 Which one of the following statements is correct? * (A) Both distance and displacement are vector quantities. * (B) Distance is a vector quantity but displacement is a scalar quantity. * (C) Distance is a scalar quantity but displacement is a vector quantity. * (D) Both distance and displacement are scalar quantities. ## Question 4 What is the base unit for length in the CGS system? * (A) Centimetre * (B) Foot * (C) Pound * (D) Metre ## Question 5 The speed of a body is 54 km/h. When expressed in m/s, it is equal to which one of the following given below? * (A) 15 m/s * (B) 50 m/s * (C) 194 m/s * (D) 20 m/s ## Question 6 [M0L1T-2] is the dimension of which one of the following given below? * (A) Area * (B) Volume * (C) Acceleration * (D) Velocity ## Question 7 Certain physical quantities, which are derived from the base quantities and can be expressed as a combination of the base units, are called as: * (A) Fundamental units * (B) Derived units * (C) Base units * (D) None of the above ## Question 8 Which one of the following option given below is correct? * (A) Speed is a scalar quantity. * (B) Light year represents the distance that light travels in one year. * (C) Kilowatt-hour is the unit of energy. * (D) All of the above ## Question 9 Which of the following is not a unit of time? * (A) Second * (B) Hour * (C) Light year * (D) Minute ## Question 10 Which of the following is not a unit of energy? * (A) cal * (B) kWh * (C) atm * (D) erg ## Question 11 Which one of the following pairs has equal dimensions? * (A) Torque and work * (B) Stress and energy * (C) Force and stress * (D) Force and work ## Question 12 Length cannot be measured in? * (A) Fermi * (B) Micron * (C) Deby * (D) Light year ## Question 13 Which of the following is the derived unit? * (A) Unit of mass * (B) Unit of length * (C) Unit of temperature * (D) Unit of volume ## Question 14 Which of the following is the dimensional formula of the work? * (A) [ML2T-2] * (B) [MLT-2] * (C) [ML2T-3] * (D) [ML3T-2] ## Question 15 Which of the following quantity is dimension less? * (A) Stress * (B) Pressure * (C) Strain * (D) Young’s modulus ## Question 16 What is the unit of the Coulomb constant? * (A) Nm2C-2 * (B) C2N-1m2 * (C) Cm2N-1 * (D) NC2m-2 ## Question 17 The unit of power is equivalent to: * (A) Joule per second * (B) Newton per meter * (C) Pascal per second * (D) Coulomb per second ## Question 18 Which of the following is a scalar quantity? * (A) Force * (B) Speed * (C) Velocity * (D) Acceleration ## Question 19 Which of the following the dimensions of power? * (A) MLT2 * (B) ML2T2 * (C) ML2T-3 * (D) MLT-2 ## Question 20 Which of the following is the dimensional formula of torque? * (A) ML2T2 * (B) ML2T-2 * (C) ML2T * (D) ML2T-1