QUESTIONS FOR SHORT ANSWER 1. The apparent weight of an object increases in an elevator while accelerating upward. A moongphaliwala sells his moongphali using a beam balance in an elevator. Will he gain more if the elevator is accelerating up ? Answer: No Explanation: The beam balance works on the principle of comparison of masses. …

H C Verma | Concept of Physics | Part 1 | Chapter 5 | Newton’s Laws of Motion Read More »

QUESTIONS FOR SHORT ANSWER 1. A body of mass \( m \) is placed on a table. The earth is pulling the body with a force \( mg \). Taking this force to be the action what is the reaction ? Answer: The reaction is the gravitational force with which the body pulls the earth. …

Concept of Physics | H C Verma Part 1 Solution | Chapter 04 : The Force Read More »

QUESTIONS FOR SHORT ANSWER 1. Is a vector necessarily changed if it is rotated through an angle ? Yes. Explanation: A vector depends on magnitude and direction. Rotation changes direction, so the vector changes. Exceptions: zero vector or rotation by multiples of \(360^\circ\). 2. Is it possible to add two vectors of unequal magnitudes and …

H C Verma Solution Part I Chapter 2 | Physics and Mathematics Read More »

QUESTIONS FOR SHORT ANSWER 1. The metre is defined as the distance travelled by light in 1/299,792,458 second. Why didn’t people choose some easier number such as 1/300,000,000 second ? Why not 1 second ? Answer: The number 299,792,458 was chosen because it is the exact, measured speed of light in vacuum, not an approximation. …

H C Verma Concept of Physics Solution | Chapter 1: Introduction To Physics Read More »

Exercise Questions 1. A man has to go 50m due north, 40m due east and 20m due south to reach a field. (a)What distance he has to walk to reach the field? (b)What is his displacement from his house to the field? Solution: Step 1: Identify the Path Segments The motion consists of three distinct …

HC Verma Physics Solutions Part I: Chapter 3 Kinematics Read More »

Exercise Questions 1. A man has to go 50m due north, 40m due east and 20m due south to reach a field. (a)What distance he has to walk to reach the field? (b)What is his displacement from his house to the field? Solution: Step 1: Identify the Path Segments The motion consists of three distinct …

HC Verma Physics Solutions Part I Read More »

Chapter 3. Current Electricity

1. The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4Ω, what is the maximum current that can be drawn from the battery? (A) 30 A (B) 40 A (C) 20 A (D) 50 A Answer: (A) 30 A Explanation: The maximum current is …

NCERT Physics Class 12 Solution Read More »

The torque-speed characteristic curve is one of the most important performance indicators of a three-phase induction motor. It shows how the motor’s developed torque varies with rotor speed, from standstill to synchronous speed, and helps engineers understand starting performance, running behavior, and overload capacity. Torque Equation:  The torque \( T \) developed by a three-phase …

Torque-Speed Curve of Three-Phase Induction Motor Read More »

Q. A circle with the equation \( (x – h)^2 + (y – k)^2 = r^2 \) is shifted 3 units to the right and 2 units down. What is the new equation of the circle? Solution: The original center of the circle is \( (h, k) \). After shifting 3 units to the right …

Co-ordinate Geometry Read More »