Which of the following is true? The density of water

Normal range of the frequency of sound, which the human beings can hear, is

When the temperature of an ideal gas is increased at constant pressure,

The characteristic of sound which enables us to distinguish two musical notes having the same frequency and loudness is called

It describes the luminous flux incidence per unit area and is expressed in lumens per square meter.

The amount of heat which is absorbed during the change of state of a substance without rise in its temperature is called its

At what temperature do both the centigrade and Fahrenheit thermometers show the same reading

Sound above the frequency of 20000 Hz is called

A wave in which the particles of the material move up and down as the waves goes from left is called a

According to this law, “The force between two charges varies directly as the magnitude of each charge and inversely as the square of the distance between them

It states that, "If a stress is placed on a system on equilibrium whereby the equilibrium is altered, that change will take place which tends to relieve or neutralize the effect of the added stress".

Material a is a water and material b is a glass with index of refraction 1.52. If the incident ray makes an angle of 60o with the normal, find the direction of the reflected ray.

A 60-ohm electric lamp if left connected to a 240-volt line for 3.0 min. How much energy is taken from the line?

A 1-hp motor is rated at 1kW. What is its efficiency?

Suppose that energy Q is required to accelerate a car from rest to v, neglecting friction. How much added energy would be required to increase the speed from v to 2v?

What is the kinetic energy of a 1-pound weight that has fallen 16 feet?

“At any point along a streamline in an ideal fluid in steady flow, the sum of the pressure, the potential energy per unit volume and the kinetic energy per unit volume have the same value.” The concept is known as

What is the power of an elevator which can lift a 100 kg mass a distance of 20 m in 5 seconds?

Which one of the following processes of heat transfer requires the presence of a fluid?

When the pitch of a note is raised then, its