Physics Test - ...

The thermo-emf of a thermocouple varies with the temperature θ of the hot junction as E = aθ + bθ² in volts ,where the ratio a/b is 700°C. If the cold junction is kept at 0°C, what is the neutral temperature?

If the acceleration due to gravity is 'g' on the surface of Earth, then the value of acceleration due to gravity at a height of 32 km above the surface of Earth is (radius of Earth = 6400 km)

The maximum height attained by a projectile is increased by 10% by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be?

If the distance between a point charge and an infinitely large charge plate is increased by factor 2, the new force on the point charge will be

Two point charges, each of charge + q, are fixed at (+ a, 0) and (– a, 0). Another positive point charge q placed at the origin is free to move along the x-axis. The charge q at the origin in equilibrium will have

Three rods made of the same material and having the same cross-section have been joined as shown in the figure below. Each rod is of the same length. The left and right ends are kept at 0^oC and 90^oC, respectively. The temperature of the junction of the three rods will be

The resistance of bulb filament is 100W at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, its resistance will become 200 W at a temperature (°C) of _____.

A liquid takes 6 minutes to cool from 80^oC to 50^oC. If the temperature of the surroundings is 20^oC, then how long will it take to cool from 60^oC to 30^oC?