NEET 2020 Phase 1 | Properties of Matter Question 19 | Physics

A wire of length L, are of cross section A is hanging from a fixed support. The length of the wire changed to L₁ when mass M is suspended from its free end. The expression for Young's modulus is :

$${{Mg\left( {{L_1} - L} \right)} \over {AL}}$$

$${{MgL} \over {A{L_1}}}$$

$${{MgL} \over {A\left( {{L_1} - L} \right)}}$$

$${{Mg{L_1}} \over {AL}}$$

NEET 2019

MCQ (Single Correct Answer)

-1

A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in tmperature. The length of aluminium rod is : ($$\alpha $$_Cu = 1.7 × 10^–5 K^–1 and $$\alpha $$_Al = 2.2 × 10^–5 K^–1)

119.9 cm

88 cm

68 cm

6.8 cm

NEET 2019

MCQ (Single Correct Answer)

-1

When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + $$l$$). The elastic potential energy stored in the extended wire is :

Mgl

mgL

$${1 \over 2}$$Mgl

$${1 \over 2}$$MgL

NEET 2019

MCQ (Single Correct Answer)

-1

A small hole of area of cross-section 2 mm² present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s², the rate of flow of water through the open hole would be nearly :

8.9 × 10^–6 m³/s

2.23 × 10^–6 m³/s

6.4 × 10^–6 m³/s

12.6 × 10^–6 m³/s

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