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 Nanosecond

A nanosecond (NS) is an SI UNIT of time EQUAL to one billionth of a SECOND.

 TWO WAVES of same frequency travelling in the opposite DIRECTION

Stationary wave is FORMED by two waves of same frequency travelling in the opposite direction.

 The EARTH ROTATES from WEST to EAST

The earth rotates from west to east.

 LAW of CONSERVATION of CURRENT

Law of conservation of current is not a valid conservation law of classical physics.

 Decibel

Decibel is the SI UNIT of INTENSITY of SOUND.

 SEISMOGRAPH

An INSTRUMENT that RECORDS EARTHQUAKES is Seismograph.

 BLACK and ROUGH

A BODY ABSORBS HEAT most if it is black and rough.

 HARMONICS PRESENT

Quality of a MUSICAL NOTE DEPENDS on harmonics present.

 LONG wavelength

Red light is USED as danger signal because it is having HIGH wavelength, less scattering ,hence can travel LARGER DISTANCES.

 Decreases

When DETERGENT is added to water, it decreases the SURFACE tension of the water. Compounds that LOWER water's surface tension are called SURFACTANTS, which work by separating the water molecules from one ANOTHER.

 Whose resistance falls almost to zero at very low temperatures

Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic FIELDS occurring in certain MATERIALS when cooled below a characteristic critical temperature. It is characterized by the Meissner EFFECT, the COMPLETE ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An ELECTRIC current flowing in a loop of superconducting wire can persist indefinitely with no power source.

 At the top of a mountain

At HIGH altitude pressure is low and therefore the BOILING point is ALSO low. In this case, water STARTS boiling below its boiling point but rice cooks at 100. So, it is difficult to cook rice at high altitudes.

 Non-elastic EFFECTS

Rolling FRICTION is CAUSED by non-elastic effects.

 All of the above

Echolocation is an adaptation bats USE to LOCATE flowering plants, HUNT insects in flight and find warm places for HIBERNATION.

 FORCED vibrations

When a vibrating tuning fork is placed on a table, then a large sound is HEARD due to the ENTIRE system begins vibrating and forces SURROUNDING air PARTICLES into vibration motion. The tendency of one object to force another adjoining or interconnected object into vibration motion is referred to as a forced vibration.

 Ultraviolet

The LYMAN SERIES lies in the ultraviolet REGION of electromagnetic spectrum.

 All of the above

The strength of an electromagnet can be increased by increasing the LENGTH of the coiled WIRE, increasing current SUPPLY or increasing the NUMBER of turns.

 Galileo

Thermoscopes were the earliest TYPES of THERMOMETERS and they only showed CHANGES in TEMPERATURE but didn't show NUMERICAL values. One of the first thermoscopes was developed by Italian inventor, Galeleo Galilei in 1593.

 DECREASES

Relative humidity is the ratio of the partial PRESSURE of water vapour in an air-water mixture to the SATURATED vapour pressure of water at a prescribed TEMPERATURE. The relative humidity of air depends not only on temperature but also on the pressure of the system of interest. If the system at State A is isobarically heated (heating with no change in system pressure) then the relative humidity of the system decreases because the saturated vapour pressure of water increases with increasing temperature.

 VELOCITY

Acceleration is the RATE of CHANGE of velocity.

 Non-uniform

In non-uniform MOTION of a BODY its VELOCITY VARIES with TIME.

 They contain free electrons

METALS are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which OUTER electrons can move freely. Instead of orbiting their RESPECTIVE atoms, they form a SEA of electrons that surround the positive nuclei of the INTERACTING metal ions.

 A safety device

In the electrical CIRCUIT of a house, the FUSE ACTS as a safety device.

 OHM

The UNIT of IMPEDANCE, LIKE that of RESISTANCE, is the ohm.

 NEUTRAL PARTICLES

X–rays are neutral particles.

 Max Planck unveiled the Quantum Theory

General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907–1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first ATLANTIC wireless transmission on December 11, 1901; and Madame Curie becoming the first WOMAN Nobel PRIZE WINNER: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.

 Solar RADIATION

The energy that generates wind COMES from solar radiation.

 Violet LIGHT

The refractive index of a transparent MEDIUM is most for violet light. The reason is that the SPEED of violet light is least in a transparent medium while the speed of RED light is most in transparent medium.

 Oxygen

As SUNLIGHT passes through the atmosphere, all UVC and approximately 90% of UVB radiation is absorbed by ozone, water VAPOUR, oxygen and carbon dioxide. UVA radiation is LESS affected by the atmosphere. Therefore, the UV radiation reaching the Earth's surface is largely composed of UVA with a small UVB COMPONENT.

 Watt

Electricity is MEASURED in WATTS and KILOWATTS.

 Inertia

Newton's FIRST law of motion is SOMETIMES referred to as the law of inertia. An object at REST stays at rest and an object in motion stays in motion with the same SPEED and in the same DIRECTION unless acted upon by an unbalanced force.

 4°C

The DENSITY of WATER is 1 g/cc. This is STRICTLY VALID at 4°C.

 Gamma-emission

Gamma-RAYS do not carry any charge. These rays do not have any mass and hence can not be CONSIDERED to be MADE up of particles.

 All of the above

Radio telescopes are better than OPTICAL telescopes because they can detect FAINT galaxies which no optical telescope can, they can work even in cloudy conditions and they can work during the DAY and NIGHT.

 PHOTOSYNTHESIS

Solar ENERGY is CONVERTED into CHEMICAL energy during photosynthesis.

 More than the TRUE weight

If LIFT is going up with acceleration, the APPARENT weight of a body is more than the true weight.

 Pyrometers

A pyrometer is a type of remote-sensing THERMOMETER used to measure the temperature of a surface. It is a device that from a distance DETERMINES the temperature of a luminous surface from the spectrum of the thermal radiation it EMITS, a PROCESS known as pyrometry.

 The heating effect of the current

The electric FUSE is based on the heating effect of the current. Electric fuse have low MELTING point so when high current FLOW through fuse wire it heated and MELTED and break down the electric circuit.

 CONVEX mirror

A convex mirror bends LIGHT as it reflects the light, and the farther away a point is from the center, the more the light is BENT. As a result, an image FORMED in a convex mirror is smaller than an image in a plane (flat) mirror.

 Acceleration

The ENERGY possessed by a body by virtue of its motion is called kinetic energy. Potential Energy is the energy possessed by virtue of its POSITION or configuration. When a body FALLS from an aeroplane, there is INCREASE in its acceleration.

 II and III

Refraction and INTERNAL reflection are RESPONSIBLE for this physical PHENOMENA.

 INTEGRATED circuit

IC stands for Integrated Circuit. It is a set of ELECTRONIC circuits on one small plate (“chip”) of semiconductor material, normally silicon. Also KNOWN as chip or microchip, ICs are the heart and brains of most circuits and are are a keystone of MODERN electronics.

 GENE MUTATION

Gamma RAYS can CAUSE Gene mutation.

 Velocity

During UNIFORM motion of an object ALONG a straight LINE, its velocity REMAINS CONSTANT with time.

 Humidity

The SPEED of sound varies depending on the temperature, pressure, and density of the MEDIUM through which the sound waves travel. In most of the CASES, it is density which matters. Sound travels faster through denser air (or other material). The density of air is AFFECTED by ATMOSPHERIC pressure, temperature, and altitude.

 A PHOTOMETER

The illuminating POWERS of TWO sources are COMPARED by a photometer.

 It is the BALANCE between INCOMING and outgoing radiation

Incoming heat being absorbed by the Earth, and outgoing heat ESCAPING the Earth in the form of radiation are both perfectly balanced. If they were not balanced, then Earth would be getting either PROGRESSIVELY warmer or progressively cooler with each passing year. This balance between incoming and outgoing heat is KNOWN as Earth’s heat budget.

 ATOMIC emission

The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter FAST moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright YELLOW light. The mechanism in mercury vapour lamp is more INVOLVED and sequential. The sputtered electrons from the filaments, after having been ACCELERATED by high voltage, hit the mercury atoms. Here also, the excited electrons of mercury atoms relax by emitting characteristic but ultraviolet light.

 Cyanometer

A cyanometer (from cyan and -meter) is an instrument for measuring "blueness", SPECIFICALLY the colour INTENSITY of BLUE SKY.

 TOTAL internal REFLECTION

A PERISCOPE works by the PRINCIPLE of total internal reflection.