Helical Spring
 1) Which law is used in the movement of a helical spring? Hooke’s Law Pascal’s Law Gravitational Law Newton’s Law

 2) Which of the following is correct regarding the helical spring? F = 2kx F = kx F = k/x F = -kx

 3) Give the condition at which a spring obeys Hooke’s law The extension of the spring should be greater than the elastic limit The extension of the spring should be less than the elastic limit The extension of the spring should equal to the elastic limit The extension of the spring should be within the elastic limit

 4) The spring constant of a certain spring is calculated as k(e) when measured in earth. If the spring constant of the same spring is calculated on the moon (ie; k(m)), what will be the ratio of the respective spring constants? 1 0 Cannot determined 1/6

 5) How does the force constant depend upon the mass of the load? Force constant does not depend on load None of these Force constant increases with increase in load Force constant is inversely proportional to the load

 6) Which is the incorrect statement ? The unit of stress and modulus of elasticity are same. Young’s modulus has the unit N/m^2 Strain has no unit The unit of stress is Nm^2

 7) Which of the following is an application of helical springs? Car suspension Mattress springs All of the above Automatic door closers

 8) Hooke’s Law holds good up to which limit ? Plastic limit Infinity Elastic limit None of these

 9) What is the unit of spring constant? Nm Nm^2 N/m N/m^2

 10) Find the extension produced by a helical spring of spring constant 30N/m, when a mass of 500g is attached to its end? 0.16 m None of these 0.016 m 1.6 m

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