At a certain point in a strained material, there are two mutually perpendicular stresses σ_{x} = 100 N/mm^{2} (Tensile) and σ_{x} = 50 N/mm^{2} (Compressive). [Notations : Tension (+); Compression (-) ] What are the values of the principal stresses in N/mm^{2} at that point ?

Which of the following materials are used as landfill salients for the control of gas and leachate moments ? 1. Lime 2. Sand 3. Bentonite 4. Fly ash 5. Butyl rubber Select the correct answer from the codes given below :

In a three-dimensional incompressible flow, the velocity component in the X and Y directions are u = 2x^{2} + z^{2} + 6 and v = y^{2} + 2z^{2} + 7. What is the velocity component in the z-direction ?

Brake is applied on a vehicle which then skids a distance of 16 m before coming to stop. If the developed average coefficient of friction between the tyres and the pavement is 0.4, then the speed of the vehicle before skidding would have been nearly