Physics

Question 1

1Hooke's law applies beyond the elastic limit.

Easy

A. True B. False

Question 2

2Young's modulus is

Medium

A. stress × strain B. stress ÷ strain C. strain ÷ stress D. force ÷ extension

Question 3

3A spring stretches 2 cm under a load of 2 N. Find its spring constant.

Easy

A. 2 N/m B. 0.04 N/m C. 100 N/m D. 0.01 N/m

Question 4

4Find the energy stored in a spring of constant 200 N/m stretched by 0.05 m.

Medium

A. 0.25 J B. 5 J C. 0.5 J D. 10 J

Question 5

5A spring of constant 20 N/m carries a load of 4 N. Its extension is ___ m.

Easy

Your answer (fill in the blank)

Question 6

6A brittle material

Easy

A. is always a metal B. is very elastic C. stretches a lot before breaking D. breaks with little or no plastic deformation

Question 7

7Find the energy stored in a spring of constant 100 N/m stretched by 0.05 m.

Medium

A. 0.25 J B. 5 J C. 0.125 J D. 2.5 J

Question 8

8Strain is defined as

Easy

A. force ÷ area B. force × extension C. length × extension D. extension ÷ original length

Question 9

9Stress is defined as

Easy

A. extension per unit length B. force per unit cross-sectional area C. mass per unit volume D. force × length

Question 10

10Springs in series with the same stiffness k have an effective stiffness of

Hard

A. 2k B. k/2 C. k² D. k