Explore topic-wise InterviewSolutions in .

 Frequency

The AMOUNT of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is INVERSELY proportional to the wavelength. The HIGHER the photon's frequency, the higher its energy. Equivalently, the longer the photon's wavelength, the LOWER its energy.

 Mass

Archimedes’ PRINCIPLE states that upward buoyant force exerted on a BODY immersed in a fluid is equal to the WEIGHT of the fluid the body DISPLACES.

 Coal

Coal is a NON RENEWABLE SOURCE of ENERGY.

 It retains the heat inside by the green house effect

Cover of the solar cooker is made of glass because glass allows the sunlight to PASS through it and concentrate at one FOCAL point, it ALSO prevents heat to escape out of the cooker.

 Transmit or absorb LIGHT of different colours

Optical filters are devices that SELECTIVELY transmit light in a particular range of wavelengths, that is, colors, while blocking the remainder. They are commonly used in photography (where some special effect filters are occasionally used as WELL as absorptive filters), fluorescence microscopy, spectroscopy, clinical CHEMISTRY, colour STAGE lighting, etc.

 Our perspiration eva-porates RAPIDLY

During HOT weather, the fan produces a feeling of COMFORT. This is because our perspiration evaporates rapidly.

 Both (A) and (B)

ACCORDING to the PRINCIPLE of FLOTATION, when a body is immersed in a fluid, two forces ACT on it: (1) The weight of the body acting vertically downward through the centre of gravity of the body, and (2) The upthrust of the fluid acting vertically upward through the centre of gravity of the fluid displaced, i.e., centre of buoyancy. The upthrust is also termed as BUOYANT force.

 Gravity

It happens because of gravity. A key feature of super maneuvering aircrafts is a high thrust-to-weight ratio; that is, the comparison of the force produced by the engines to the aircraft’s weight, which is the force of gravity on the aircraft. A thrust-to-weight ratio greater than 1:1 is a critical threshold, as it allows the aircraft to maintain and EVEN gain velocity in a nose-up attitude; such a climb is based on sheer engine POWER, without any lift provided by the wings to counter gravity, and has become crucial to AEROBATIC maneuvers in the vertical LOOP.

 Polarisation

The POLARIZATION PHENOMENON, verifies the transverse NATURE of light.

 The level of the liquid in the two vessels are at the same HEIGHT.

SIPHON is a tube bent to form two legs of unequal length by which a liquid can be transferred from a reservoir and then down to a LOWER level of it. Siphon will fail to WORK if, the level of the liquid in the two vessels are at the same height.

 VISCOSITY

A liquid disturbed by STIRRING COMES to REST DUE to viscosity.

 MICROWAVE radiation

The parts of the ELECTROMAGNETIC spectrum, arranged from highest energy to lowest, are gamma rays, X-rays, ultraviolet light, VISIBLE light, infrared light, microwaves, and radio WAVES.

 ANGLE

Radian is USED to MEASURE angle.

 TENSOR

Stress is defined as RESISTING force per unit area of an element, on which load is applied. Stress is always perpendicular to a cross-section in the element. It is neither scalar (it cannot be numerically added), nor is it a vector (it does not follow the TRIANGLE rule of vector addition). It is a tensor quantity because it DESCRIBES things happening in two directions simultaneously.

 CONVECTION

Ocean CURRENTS are an EXAMPLE of convection.

 PHOTOVOLTAIC effect

Photovoltaic modules, commonly called solar modules, are the key components used to CONVERT SUNLIGHT into electricity. Light striking the crystals induces the “photovoltaic effect,” which generates electricity. The electricity produced is called direct current (DC) and can be used immediately or STORED in a battery.

 SCATTERING of light

Gases and PARTICLES in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter, smaller WAVES. This is why we see a blue SKY most of the TIME.

 ABSOLUTE humidity

The relative humidity of air at a given temperature is the RATIO of mass of water vapour actually present in a certain VOLUME of air to the mass of water vapour required to saturate the same volume of air at the same temperature, miltiplied by 100. Absolute Humidity refers to the amount of water vapour present in UNIT volume of air, expressed in grams per cubic METRE.

 X - RAYS, INFRARED, VISIBLE, MICROWAVE

X - rays, infrared, visible, microwave

 Radiowave

Radio waves are USED to carry SATELLITE signals. These waves TRAVEL at 300,000 km/s (the SPEED of light).

 11.2 km/sec

The minimum velocity REQUIRED for a ROCKET to overcome earth's gravity and TRAVEL into space is 11.2 km/sec.

 COHESIVE force between molecules

Surface tension could be defined as the property of the surface of a liquid that ALLOWS it to RESIST an external force, due to the cohesive nature of the WATER molecules.

 REFRACTION

When light passes from ONE MEDIUM to another, this PHENOMENON of change in its DIRECTION is called refraction.

 It is ready to produce controlled energy

To produce controlled energy i.e energy at a controlled or STEADY rate, the NUMBER of fissions per second MUST be controlled and maintained at that rate. Excess neutrons should be absorbed by control roads LIKE CADMIUM.

 HIGH resistance and LOW melting point

Fuse is a PIECE of wire of a material with a very low melting point. When a high current flows through the CIRCUIT due to overloading or a SHORT circuit, the wires gets heated and melts. As a result,the circuit is broken and current stops flowing.

 COMBINATIONS of LENSES

Large astronomical telescopes always USE as objective combination of lenses.

 Johannes KEPLER

Johannes Kepler published his first two laws about planetary motion in 1609 , having found them by ANALYZING the astronomical OBSERVATIONS of Tycho Brahe. Kepler's THIRD LAW was published in 1619.

 METAL

The VELOCITY of the SOUND is HIGHEST in metal.

 The MASS of the LIQUID DISPLACED

Buoyancy DEPENDS on the mass of the liquid displaced.

 WIND SPEED

An anemometer is an instrument that measures wind speed and wind pressure. Anemometers are IMPORTANT tools for meteorologists, who STUDY weather patterns.

 IRREGULARITIES

Friction is CAUSED by the irregularities on the TWO SURFACES in CONTACT.

 Convex

Type of mirror USED in the rear-view mirror MUST be convex MIRRORS, because it creates smaller, yet still upright images. Concave mirrors would create an inverted image and the CARS you SEE are not upside down.

 non-luminous HEAVENLY BODIES

Planets are non-luminous heavenly bodies.

 Unequal HEATING of different parts of the atmosphere

Mirages happen when the ground is very hot and the air is cool. The hot ground WARMS a layer of air just above the ground. When the light moves through the COLD air and into the layer of hot air it is refracted (bent). A layer of very WARM air near the ground refracts the light from the sky nearly into a U-shaped BEND.

 One Fourth

If the DISTANCE is DOUBLED, the force of GRAVITY is one-fourth as STRONG as before.

 Pressure

The INCREASED WIND speed is ACCOMPANIED by low/reduced AIR pressure.

 5 : 3

In general, the INTENSITY of a wave is PROPORTIONAL to the SQUARE of its amplitude. This has an important IMPLICATION: relative intensity can be obtained by SQUARING relative amplitude.
I α a²
So if the intensity ratio is 25:9, the amplitude ratio will be 5:3.

 ENDOSCOPY

Optic FIBRES are USED in endoscopy.

 Unequal HEATING of DIFFERENT PARTS of the atmosphere

Mirage is DUE to unequal heating of different parts of the atmosphere.

 refraction and reflection of SUNLIGHT by WATER droplets

A RAINBOW is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets RESULTING in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight ALWAYS appear in the section of sky directly opposite the sun.

 It has a very high refractive INDEX

The basic REASON for the extraordinary SPARKLE of suitably CUT diamond is that it has a very high refractive index.

 Decibel

We measure sound intensity (also referred to as sound POWER or sound pressure) in units CALLED decibels. Decibels (DB) are named in HONOR of Alexander GRAHAM Bell, the inventor of both the telephone and the audiometer.

 Air

Originally designed for recovery of VALUABLE INDUSTRIAL-process MATERIALS, electrostatic PRECIPITATORS are used for air pollution control, particularly for removing particles from waste gases at industrial FACILITIES and power-generating stations.

 Decreasing pressure

A BAROMETER measures air pressure: A "rising" barometer indicates INCREASING air pressure; a "FALLING" barometer indicates decreasing air pressure.

 0

In free expansion there is no work done as there is no external external pressure. That's certainly true, in fact free expansion is an irreversible process in which a gas EXPANDS into an INSULATED evacuated chamber, you can THINK of it like ann CONTAINER with a PISTON and the gas is left to expand in vacuum.

 God PARTICLE

The term ''HIGGS Boson' is ASSOCIATED with God particle.

 Piezo - electric EFFECT

The QUARTZ crystal oscillates (VIBRATES back and forth) at a precise frequency: EXACTLY 32768 times each second. This is due to Piezoelectric Effect. Piezoelectric Effect is the ability of certain MATERIALS to generate an electric charge in response to applied mechanical stress.

 Just before it TOUCHES the GROUND

When an object reaches the ground it has its maximum value of kinetic energy just before touching the ground. Since kinetic energy + POTENTIAL energy= CONSTANT; so on REACHING ground the potential energy of an object becomes zero (0). The kinetic energy on reaching ground becomes maximum.

 At a higher elevation than the bird

A HUNTER on the ground WISHES to SHOOT a bird on a tree at a distance with his rifle. He has to POINT the rifle at a higher elevation than the bird.

 10^-30 kg to 10⁵⁵ kg

The range of MASSES goes from 10^-30 kg (mass of an ELECTRON)to 10⁵⁵ kg (mass of KNOWN observable universe).