Physics Test 57

In the following ‘I’ refers to current and other symbols have their usual meaning. Choose the option that corresponds to the dimensions of electrical conductivity:

A rocket is fired vertically from the earth with an acceleration of 2g, where g is the gravitational acceleration. On an inclined plane inside the rocket, making an angle θ  with the horizontal, a point object of mass m is kept. The minimum coefficient of friction μ_min between the mass and the inclined surface such that the mass does not move is: 

 car of weight W is on an inclined road that rises by 100 m over a distance of 1 km and applies a constant frictional force W / 20 on the car. While moving uphill on the road at a speed of 10ms⁻¹ the car needs power P. If it needs power P / 2 while moving downhill at speed v then value of v is:

200 g water is heated from 40^∘C to 60^∘C. Ignoring the slight expansion of water, the change in its internal energy is close to (Given specific heat of Water = 4184 J/kg/K): 

The ratio of work done by an ideal monoatomic gas to the heat supplied to it in an isobaric process is

Two particles are performing simple harmonic motion in a straight line about the same equilibrium point. The amplitude and time period for both particles are same and equal to A and T, respectively. At time t = 0 one particle has displacement A while the other one has displacement −A / 2 and they are moving towards each other. If they cross each other at time t, then t is: