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.
Which one of the following propagates with the same speed as speed of light?
The instrument, which measures temperature by radiation, is called
A spaceship moving away from Earth with speed of 0.900c fires a robot space probe in the same direction as its motion, with speed of 0.700c relative to the spaceship. What is the probe’s velocity relative to the Earth?
A 1-hp motor is rated at 1kW. What is its efficiency?
Normal range of the frequency of sound, which the human beings can hear, is
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
The work done by all forces except the gravitational force is always equal to the one of the system
At what temperature do both the centigrade and Fahrenheit thermometers show the same reading
A person’s mass is 75.2 kg. If the person walks up a flight of stairs 12.6 m high in 28 s at constant velocity, what is the power output?
Which of the following is true? The density of water
A mass of 8 kg is above a given datum, where local g is 9.70 m/s^2. Calculate the gravitational force with respect to the datum?
In physics, what is the unit of luminous intensity?
In optics, this effect refers to the blurring of the image produced on a concave mirror due to the convergence of rays far from the mirror to other points on the principal axis. What do you call this effect?
“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
Which of the following thermometers is best suited for measuring a temperature of nearly 1500oC?
The characteristic of sound which enables us to distinguish two musical notes having the same frequency and loudness is called
The energy stored in a starched elastic material such as spring is