1. Strain is defined as the ratio of

(a) change in volume to original volume

(b) change in length to original length

(c) change in cross-sectional area to
original cross-sectional area

(d) any one of the above

(e) none of the above.

2. Hooke's law holds good upto

(a) yield point

(b) limit of proportionality

(c) breaking point

(d) elastic limit

(e) plastic limit.

3. Young's modulus is defined as the ratio
of

(a) volumetric stress and volumetric strain

(b) lateral stress and lateral strain

(c) longitudinal stress and longitudinal
strain

(d) shear stress to shear strain

(e) longitudinal stress and lateral strain.

4. The unit of Young's modulus is

(a) mm/mm

(b) kg/cm

(c) kg

(d) kg/cm

^{2}
(e) kg cm

^{2}.
5. Deformation per unit length in the
direction of force is known as

(a) strain

(b) lateral strain

(c) linear strain

(d) linear stress

(e) unit strain.

6. It equal and opposite forces applied to
a body tend to elongate it, the stress so

produced is called

(a) internal resistance

(b) tensile stress

(c) transverse stress

(d) compressive stress

(e) working stress.

7. The materials having same elastic
properties in all directions are called

(a) ideal materials

(b) uniform materials

(c) isotropic materials

(d) practical materials

(e) elastic materials.

8. A thin mild steel wire is loaded by
adding loads in equal increments till it breaks. The

extensions noted with increasing loads will
behave as under

(a) uniform throughout

(b) increase uniformly

(c) first increase and then decrease

(d) increase uniformly first and then in-crease
rapidly

(e) increase rapidly first and then
uniformly.

9. Modulus of rigidity is defined as the
ratio of

(a) longitudinal stress and longitudinal
strain

(b) volumetric stress and volumetric strain

(c) lateral stress and lateral strain

(d) shear stress and shear strain

(e) linear stress and lateral strain.

10. If the radius of wire stretched by a
load is doubled, then its Young's modulus will be

(a) doubled

(b) halved

(c) become four times

(d) become one-fourth

(e) remain unaffected.

**Answers:**

- d
- b
- c
- d
- c
- b
- c
- d
- d
- e