NEET 2016 Phase 2 | Properties of Matter Question 34 | Physics

A rectangular film of liquid is extended from (4 cm $$ \times $$ 2 cm) to (5 cm $$ \times $$ 4 cm). If the work done is 3 $$ \times $$ 10^$$-$$4 J, the value of the surface tension of the liquid is

0.250 N m^$$-$$1

0.125 N m^$$-$$1

0.2 N m^$$-$$1

8.0 N m^$$-$$1

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Three liquids of densities $$\rho $$₁, $$\rho $$₂ and $$\rho $$₃ (with $$\rho $$₁ > $$\rho $$₂ > $$\rho $$₃), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact $$\theta $$₁, $$\theta $$₂ and $$\theta $$₃ obey

$${\pi \over 2} > {\theta _1} > {\theta _2} > {\theta _3} \ge 0$$

0 $$ \le $$ $$\theta $$₁ < $$\theta $$₂ < $$\theta $$₃ < $${\pi \over 2}$$

$${\pi \over 2} < {\theta _1} < {\theta _2} < {\theta _3} < \pi $$

$$\pi > {\theta _1} > {\theta _2} > {\theta _3} > {\pi \over 2}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

Coefficient of linear expansion of brass and steel rods are $$\alpha $$₁ and $$\alpha $$₂. Lengths of brass and steel rods are $$l$$₁ and $$l$$₂ respectively. If ($$l$$₁ $$-$$ $$l$$₂) is maintained same at all temperatures, which one of the following relations holds good?

$$\alpha $$₁$$l$$₂ = $$\alpha $$₂ ²$$l$$₁

$$\alpha $$₁$$l$$₁ = $$\alpha $$₂l₂

$$\alpha $$₁$$l$$₂ = $$\alpha $$₂$$l$$₁

$$\alpha $$₁$$l$$₂² = $$\alpha $$₂$$l$$₁²

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

A black body is at a temperature of 5760 K. The energy of radiation emitted by the body at wavelength 250 nm is U₁, at wavelength 500 nm is U₂ and that at 1000 nm is U₃. Wien's constant, b = 2.88 $$ \times $$ 10⁶ nm K. Which of the following is correct ?

U₁ > U₂

U₂ > U₁

U₁ = 0

U₃ = 0

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