Physics Test 21...

A cylinder of fixed capacity 44.81 contains hydrogen gas at STP. What is the amount of heat needed to raise the temperature of the gas in the cylinder by 20°C? (R = 8.31 J mol^-1 K^-1)

The total internal energy of 4 moles of a diatomic gas at a temperature of 27^∘C is (Universal gas constant 8.31J mol⁻¹K⁻¹)

Assertion: In a vernier caliper, one vernier scale division is smaller than one main scale division.

Reason: The vernier constant is given by one main scale division multiplied by the number of vernier scale divisions.

A balloon is rising vertically up with a velocity of 29ms⁻¹. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it, was (g = 9.8 ms⁻²)

If two soap bubbles of different radii are connected by a tube

In a vessel, the ideal gas is at a pressure P. If the mass of all the molecules is halved and their speed is doubled, then resultant pressure of the gas will be

A satellite is revolving around the earth in a circular orbit with kinetic energy of 1.69 × 10¹⁰ J. The additional kinetic energy required for just escaping into the outer space is

The displacement y of a particle in a medium can be expressed as, y = 10⁻⁶ sin  m where t is in second and x in meter. The speed of the wave is

One mole of a gas having  is mixed with one mole of a gas having  The value of y for the mixture is (y is the ratio of the specific heats of the gas)

The energy required to take a body from the surface of the earth to a height equal to the radius of the earth is 'W'. The energy required to take this body from the surface of the earth to a height equal to twice the radius of the earth is