Hooke's law Quiz

1. A string of natural length $2$ m and modulus of elasticity $50$ N is stretched by $0.4$ m. Find the tension.

• A. $40$ N
• B. $4$ N
• C. $10$ N
• D. $100$ N

2. What are the units of the modulus of elasticity $\lambda$?

• A. N m
• B. N
• C. N m$^{-1}$
• D. kg

3. A string of natural length $1.5$ m is attached to a particle. When does it exert a tension?

• A. Always
• B. When its length is less than $1.5$ m
• C. When its length equals $1.5$ m
• D. Only when its length exceeds $1.5$ m

4. A string of natural length $0.8$ m and modulus $24$ N supports a particle of weight $2.4$ N. Find the extension.

• A. $0.08$ m
• B. $0.8$ m
• C. $0.3$ m
• D. $0.008$ m

5. A spring of natural length $0.5$ m is compressed to $0.3$ m by a thrust of $8$ N. Find its modulus of elasticity.

• A. $8$ N
• B. $20$ N
• C. $32$ N
• D. $40$ N