JEE Main 2019 (Online) 12th April Morning Slot | Properties of Matter Question 117 | Physics

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

At 40^o C, a brass wire of 1 mm radius is hung from the ceiling. A small mass, M is hung from the free end of the wire. When the wire is cooled down from 40^oC to 20^oC it regains its original length of 0.2 m. The value of M is close to : (Coefficient of linear expansion and Young’s modulus of brass are 10^–5 /^oC and 10¹¹ N/m ² , respectively; g= 10 ms^–2 )

1.5 kg

0.5 kg

9 kg

0.9 kg

JEE Main 2019 (Online) 10th April Evening Slot

MCQ (Single Correct Answer)

-1

Water from a tap emerges vertically downwards with an initial speed of 1.0 ms^–1 . The cross-sectional area of the tap is 10^–4 m². Assume that the pressure is constant throughout the stream of water and that the flow is streamlined. The cross-sectional area of the stream, 0.15 m below the tap would be : (Take g = 10 ms^–2)

5 × 10^–4 m²

2 × 10^–5 m²

5 × 10^–5 m²

1 × 10^–5 m²

JEE Main 2019 (Online) 10th April Evening Slot

MCQ (Single Correct Answer)

-1

A submarine experiences a pressure of 5.05 × 10⁶ Pa at a depth of d₁ in a sea. When it goes further to a depth of d₂, it experiences a pressure of 8.08 × 10⁶ Pa. Then d₂ –d₁ is approximately (density of water = 10³ kg/m³ and acceleration due to gravity = 10 ms^–2 ) :

600 m

400 m

300 m

500 m

JEE Main 2019 (Online) 10th April Evening Slot

MCQ (Single Correct Answer)

-1

In an experiment, brass and steel wires of length 1 m each with areas of cross section 1mm² are used. The wires are connected in series and one end of the combined wire is connected to a rigid support and other end is subjected to elongation. The stress required to produce a net elongation of 0.2 mm is, [Given, the Young's Modulus for steel and brass are, respectively, 120 × 10⁹ N/m² and 60 × 10⁹ N/m²]

8.0 × 10⁶ N/m²

1.2 × 10⁶ N/m²

0.2 × 10⁶ N/m²

1.8 × 10⁶ N/m²

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