Related InterviewSolutions

• A smooth sphere `(` mass `10kg. ` negligible radius `)` rolls on a smooth curved surface from the point `A` with a speed of `10m//s` as shown in figure. The sphere reaches the point `D` passing through point `B`. If the ground is taken as reference . Then `[` Take `g=10m//s^(2)]` Will the sphere go beyond `D ` ?A. YestB. NoC. More information is requiredD. none of these
• Parallelogram law of vectors is applicable to the addition of `:`A. Any two vectorsB. Two scalarsC. A vector and a scallarD. Two vectors representing same physical quantity.
• A particle moves in `xy` plane accordin to the law `x=a sin w t` and `y=a (1- cos w t )` where `a` and `w` are costant . The particle traces.A. a parabolaB. a straight line equally inclined to `x` and `y` axesC. a circleD. a distane proportional to time.
• A particle is moving in a circle of radius `r` centred at `O` with constant speed `v`. What is the change in velocity in moving from `A "to" B (/_ AOB = 40^@)` ?A. `2v cos 40^(@)`B. `2v sin 20^(@)`C. `2v cos 20^(@)`D. none of these
• A string 1m long is drawn by a 300 Hz vibrator attached to its end. The string vibrates in three segments. The speed of transverse waves in the string is equal toA. `100m//s`B. `200m//s`C. `300 m//s`D. `400 m//s`
• A metal wire of length `L` is suspended vertically from a rigid support. When a bob of mass `M` is attached to the lower end of wire, the elongation of the wire is `l:`A. The loss in gravitational potential energy of mass `M` is `Mgl`.B. The elastic potential energy stored in the wire is `Mgl`C. The elastic potential energy stored in the wire is `(1)/(2)Mgl`D. Heat produced is loss of mechanical energy of system is `(1)/(2)Mgl`
• The length of a metal wire is `l_(1)` when the tension in it is `T_(1)` and is `l_(2)` when the tension is `T_(2)`. Then natural length of the wire isA. `(l_(1)+l_(2))/(2)`B. `sqrt(l_(1)l_(2))`C. `(l_(1)T_(2)-l_(2)T_(1))/(T_(2)-T_(1))`D. `(l_(1)T_(2)+l_(2)T_(1))/(T_(2)-T_(1))`
• A wire elongastes by 1.0 mm when a load W ils hung from it. If this wire goes over a pulley and two weights W each are hung at the two ends the elongation of the wire will beA. `0.5m`B. `1.0mm`C. `2.0mm`D. `4.0mm`
• Which of the following statements is `//`are true.A. workd done by kinetic friction on an object may be positiveB. A rigid body rolls up an inclined plane without sliding. The friction force on it will be upwards `(` only contact force and gravitational force is acting. `)`C. A rigid body rolls down an inclined plane without sliding. The friction force on it will be upwards. `(` only contact force and gravitational force is acting `)`D. A rigid body is left from set rest and having no angular velocity from the top of a rough inclined plane. It moves down the plane with slipping. The friction force on it will be upwards.
• A uniform disc of mass `m` and radius `r` and a point mass `m` are arranged as shown in the figure. The acceleration of point mass is `: (` Assume there is no slipping between pulley and thread and the disc can rotate smoothly about a fixed horizontal axis passing through its centre and perpendicular to its plane `)` A. `(g)/(2)`B. `(g)/(3)`C. `(2g)/(3)`D. none of these