Water rises in a capillary tube to a certain height such that the upward force due to the surface tension is balanced by 62.84\(\times\)10^-5N force due to the weight of the liquid column. If the surface tension of water is 70\(\times\)10^-3Nm the radius of the capillary tube is ____________.

(a)

1.43\(\times\)10^-3m

(b)

2.83\(\times\)10^-3 m

(c)

1.43\(\times\)10^-2 m

(d)

2.83\(\times\)10^-3 m

The work done against surface tension in blowing a soap bubble from a radjus of 5 cm to 15 cm is ____________. (surface tension of soap solution is 30\(\times\)10^-3 Nm^-1)

(a)

2.4 πmJ

(b)

4.8 π mJ

(c)

2.4 π J

(d)

4.8 π J

Ablack body is continuously radiating measured at a temperature of 2880 k if U₁ U₂ and U₃ are the amount of radiation measured between the wavelengths 599 & 600 nm, 999 & 1000 nm & 1499 & 1500 nm respectively then _____________ (wiresconstant b = 2.88\(\times\)10²⁶ kmk)

(a)

U₂ < U₃

(b)

U₁ = U₂ = U₃

(c)

U₁23

(d)

U₂ >U₁ >U₃

A wooden block is taken to the bottom of a deep column lake of water and then released it rises up with a _____________.

(a)

constant acceleration

(b)

decreasing acceleration

(c)

constant velocity

(d)

decreasing velocity

If there were no gravity, which of the following will not be there for a fluid?

(a)

viscosity

(b)

surface tension

(c)

pressure

(d)

archimedes upward thrust