Related InterviewSolutions

• Value of radius of gyration of a body depends on axis of rotation. Radius of gyration is root mean square distance of particle of the body from the axis of rotation.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is false.D. If both assertion and reason are false.
• The radius of gyration of an uniform rod of length `l` about an axis passing through one of its ends and perpendicular to its length is.A. `l/sqrt 2`B. `l/3`C. `l/sqrt 3`D. `l/2`
• Which of the following relations is correct?A. Mechanical advantage = Effort/LoadB. Load arm `xx` Effort = Effort arm `xx` LoadC. Load arm `xx` Load = Effort arm `xx` EffortD. None of these
• Moment of couple is calledA. angular momentumB. forceC. torqueD. impulse
• A disc is rotating with angular velocity `omega`. A force F acts at a point whose position vector with respect to the axis of rotation is r. The power associated with torque due to the force is given byA. `(vecr xx vecF).vecomega`B. `(vecr xx vecF) xx vecomega`C. `vecr . (vecF xx vecomega)`D. `vecr xx (vecF. vecomega)`
• When a disc rotates with uniform angular velocity, which of the following is not true ?A. The sense of rotation remains same.B. The orientation of the axis of rotation remains same.C. The speed of rotation is non-zero and remains same.D. The angular acceleration is non-zero and remains same.
• A particle of mass m is moving in YZ-plane with a uniform velocity `v` with its trajectory running parallel to `+ve` Y-axis and intersecting Z-axis at `z=a` in figure. The change in its angular momentum about the origin as it bounces elastically form a wall at y=constant is
• Match the Column I and Column II.,B A. A-p, B-q, C-r, D-sB. A-q, B-r, C-s. D-pC. A-r, B-q, C-p, D-pD. A-r, B-s, C-p, D-q
• (1) Centre of gravity (C.G.) of a body is the point at which the weight of the body acts, (2) Centre of mass coincides with the centre of gravity if the earth is assumed to have infinitely large radius, (3) To evaluate the gravitational field intensity due to any body at an external point, the entire mass of the body can be cosidered to be concentrated at its C.G.., (4) The radius of gyration of any body rotating about ab axis is the length of the perpendicular dropped from thr C.G. the body to the axis. which one of the following paries of statements is correct ?A. (1) and (4)B. (1) and (2)C. (2) and (3)D. (3) and (4)
• Assertion: The centre of gravity of a body coincides with its centre of mass only if the gravitational field does not vary form one part of the body to the other. Reason: Centre of gravity is independent of the gravitational field.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertionC. If assertion is true but reason is false.D. If both assertion and reason are false.