NEETprep Bank NEET Physics Mechanical Properties of Solids Questions Solved

[Only for Dropper and XII batch]

#Stress-strain

Difficulty Level:

(1)
26%
(2)
36%
(3)
29%
(4)
11%

#Hooke's law

Difficulty Level:

(1)
14%
(2)
34%
(3)
42%
(4)
12%

#Stress-strain curve

Difficulty Level:

(1)
19%
(2)
21%
(3)
50%
(4)
12%

#Elasticity

Difficulty Level:

(1)
67%
(2)
12%
(3)
16%
(4)
7%

#Stress-strain

Difficulty Level:

(1)
12%
(2)
11%
(3)
13%
(4)
66%

#Poisson ratio

Difficulty Level:

(1)
38%
(2)
26%
(3)
30%
(4)
8%

#Hooke's law

Difficulty Level:

(1)
11%
(2)
76%
(3)
10%
(4)
5%

The Young's modulus of a wire of length L and radius r is $Y N / m^{2} .$ If the length and radius are reduced to L/2 and r/2, then its Young's modulus will be -

(a) 1:1 (b) 1:4

#Stress-strain

(b) Young's modulus of wire does not varies with dimension of wire. It is the property of given material.

Difficulty Level:

(1)
63%
(2)
21%
(3)
11%
(4)
7%

When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be -

(a) 0.5 cm (b) 2 cm

#Hooke's law

(c)

$l = \frac{F L}{A Y} \Rightarrow 1 \propto \frac{1}{r^{2}} (F, L a n d Y a r e c o n s \tan t) \frac{l_{2}}{l_{1}} = {(\frac{r_{1}}{r_{2}})}^{2} = {(2)}^{2} = 4 \Rightarrow l_{2} = 4 l_{1} = 4 c m$

Difficulty Level:

(1)
24%
(2)
17%
(3)
57%
(4)
4%

The area of cross-section of a wire of length 1.1 metre is 1 $m m^{2} .$ It is loaded with 1 kg. If Young's modulus of copper is $1.1 \times 10^{11} N / m^{2},$ then the increase in length will be (If $g = 10 m / s^{2}$ )

(a) 0.01 mm (b) 0.075 mm

#Hooke's law

Difficulty Level:

(1)
28%
(2)
20%
(3)
52%
(4)
2%