Physics Test - 54

The minimum number of Non zero non collinear vectors required to produce a zero vector is 3.

Ultrasonic waves are used for stirring liquid solutions because theycan produce perfectly homogeneous solutions.

Ball bearings are used in cycles, scooters etc to reduce the friction between the wheel and the axle.

The working of the quartz crystal in the watch is based on the Piezo - electric Effect.

Nuclear sizes are expressed in a unit called "Fermi" which is a unit of length equal to 10−15 metre (one femtometre), used in nuclear physics. It is similar to the diameter of a proton.

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at the bottom also increases. Therefore the spring balance reading increases.

As there is no atmosphere surrounding the moon, the sound from any band that is played there cannot travel outwards there is no material medium surrounding it for its propagation.

The information of brilliant colors in a thin soap film is a consequence of the phenomena of multiple reflections and interference.

Reflection of Light:When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light.

Interference:It is the phenomenon in which two waves superpose to form the resultant wave of the lower, higher or same amplitude. The most commonly seen interference is an optical interference or light interference.

In this position, the head light will be at the principal focus so that the rays of light falling on the cancave mirror will be rendered parallel.

Diffusion is the spreading - mixing of gases through molecular motion.