1. Can the centre of mass of a body be at a point outside the body? Answer: Yes Explanation: The centre of mass (COM) is the point where the entire mass of a body can be considered to be concentrated for the purpose of analyzing motion. It depends on the distribution of mass and not …
1. The dimension of \(\dfrac{B^2}{2\mu_0}\), where \(B\) is the magnetic field and \(\mu_0\) is the magnetic permeability of vacuum, is: 1. \([ML^{-1}T^{-2}]\) 2. \([ML^2T^{-1}]\) 3. \([MLT^{-2}]\) 4. \([ML^2T^{-2}]\) Solution: The quantity \(\dfrac{B^2}{2\mu_0}\) represents magnetic energy stored per unit volume (Energy Density). Energy Density \(=\dfrac{\text{Energy}}{\text{Volume}}\) \[ \left[\frac{B^2}{\mu_0}\right] = \frac{ML^2T^{-2}}{L^3} = \boxed{ML^{-1}T^{-2}} \] Answer: 1. \([ML^{-1}T^{-2}]\) 2. …
1. Young’s modulus of elasticity \( Y \) is expressed in terms of three derived quantities, namely, the gravitational constant \( G \), Planck’s constant \( h \) and the speed of light \( c \), as \( Y = c^\alpha h^\beta G^\gamma \). Which of the following is the correct option? [JEE (Advanced) 2023] …
QUESTIONS FOR SHORT ANSWER 1. When you lift a box from the floor and put it on an almirah the potential energy of the box increases, but there is no change in its kinetic energy. Is it a violation of conservation of energy? Solution: No, this is not a violation of the conservation of energy. …
Concept of Physics | H C Verma | Chapter 8 : Work and Energy | Solution Read More »
1. You are driving a motorcycle on a horizontal road. It is moving with a uniform velocity. Is it possible to accelerate the motorcycle without putting higher petrol input rate into the engine? Solution: Yes, it is possible to accelerate the motorcycle without increasing the petrol input rate. Velocity is a vector quantity, having both …
Concept of Physics | H C Verma | Chapter 7 : Circular Motion | Solution Read More »
QUESTIONS FOR SHORT ANSWER 1 A For most of the surfaces used in daily life, the friction coefficient is less than 1. Is it always necessary that the friction coefficient is less than 1? Answer: No Explanation: It is not always necessary for the friction coefficient to be less than 1. While many common surfaces …
HC Verma Physics Solutions Part I: Chapter 6 | Friction Read More »
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 »