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 All of the above

It is a result of unstable ATOMS that are trying to stabilize. The excess ENERGY is released as gamma particles. HOWEVER, lead, steel and concrete reduce the energy of these particles and hence STOP their penetrating abilities.

 Frictional force

A brake is a mechanical DEVICE that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, AXLE, or to PREVENT its motion, most often ACCOMPLISHED by means of FRICTION.

 Lux

The lux (symbol: lx) is the SI unit of illuminance and LUMINOUS emittance. It is used in photometry as a measure of the intensity of light, with wavelengths weighted according to the luminosity function, a STANDARDIZED MODEL of human brightness PERCEPTION.

 COHERENT and monochromatic

Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, CREATES a radiation beam that is coherent (in-phase). In a coherent light source, the AMPLITUDE of the radiated waves is added and results in a radiation beam of great INTENSITY. It normally produces only one or two WAVELENGTHS. The single wavelength is called monochromatic radiation.

 this can DAMAGE the domestic wiring due to overloading

If we CONNECT many appliances to the same socket, requirement of current for that socket will INCREASE, the wire CONNECTED to that socket will have to supply more current, that may exceed its current RATING and can damage it.

 Aluminium

Aluminium being a good CONDUCTOR of HEAT conducts away the heat from the substance quite EASILY and causes QUICK freezing.

 SILVER

In a spherical mirror, one of the two curved surfaces is coated with a thin layer of silver followed by a coating of RED lead oxide paint. Thus, one side of the spherical mirror is opaque and the other side is a HIGHLY POLISHED reflecting surface.

 TEMPERATURE

Heat FLOWS as a RESULT of DIFFERENCE of temperature.

 FREQUENCY

Pitch DEPENDS on frequency but ALSO on LOUDNESS and SPECTRUM.

 Both magnitude and direction are same

Two VECTORS and are SAID to be EQUAL, if they have the same magnitude and direction, Also same POSITIONS of their initial POINTS.

 MOMENT of INERTIA and moment of a FORCE

Moment of inertia and moment of a force does not have IDENTICAL DIMENSION.

 SALT WATER

Salt water is a CONDUCTOR of ELECTRICITY.

 Tin and Lead

An electrical fuse is a safety device in the circuit that PROTECTS electrical systems by breaking the connection when a short circuit is occurring. The fuse wire is made up of SN (tin) and PB (lead) alloy because of its HIGH resistance and low MELTING point.

 Increase

If a body is ACCELERATED, then the velocity will ALSO GET increased.

 Chemical potential energy

Gasoline is a colorless petroleum-derived flammable liquid that is used PRIMARILY as a fuel in spark-ignited internal COMBUSTION engines. It consists mostly of ORGANIC compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. It is also called as Petrol. It has chemical potential energy, in combustion it is TURNED into light, sound, HEAT and kinetic energy.

 Avoid the tracks being distorted DUE to SEASONAL temperature variation

A SMALL gap is left at the joints of rails in a railway track to avoid the tracks being distorted due to seasonal temperature variation.

 Interference

A thin oil film on a WATER SURFACE APPEARS COLOURED because of thin-film interference which involves the interference of light waves reflecting off the TOP surface of a film with the waves reflecting from the bottom surface. The refractive index of oil is larger than that of water, therefore the reflection on the back side occurs.

 931 MEV

1 AMU is EQUIVALENT to 931 MeV.

 Will increase

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.

 18/5

1 m/s EQUALS 18/5 km/hr.

 The temperature at which all molecular motion CEASES

Absolute ZERO is DEFINED as temperature at which all molecular motion ceases.

 Semi-conductor

Semiconductors are insulators at LOW temperatures and REASONABLY good conductors at HIGHER temperatures. As TEMPERATURE INCREASES, the semiconductor material becomes a better and better conductor.

 NAND and NOR

A universal gate is a gate which can IMPLEMENT any Boolean FUNCTION WITHOUT need to use any other gate TYPE. The NAND and NOR gates are universal gates.

 Transformer

Some components LIKE transformers and inductors cannot be integrated into an IC EXCEPT for very SPECIALIZED high frequency applications. They have to be connected externally to the semiconductor pins. In general, transformers are located in circuit boards as SEPARATE components and cannot be integrated into semiconductor based integrated CIRCUITS.

 PITCH circle diameter

The SIZE of the GEAR is usually specified by the pitch circle diameter. It is also called as pitch diameter.

 Capillary ACTION phenomenon

The absorption of INK by BLOTTING paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a LITTLE thicker liquids LIKE ink to absorb.

 DE BROGLIE WAVES

Matter waves are De Broglie waves.

 273K

The MELTING POINT of ICE on Kelvin scale is 273 K.

 32

32^oF is the temperature at which FRESH water freezes is called the freezing point. The freezing point is the temperature at which a LIQUID TURNS to a SOLID.

 “40°

The TEMPERATURE which has the same READING on both FAHRENHEIT and CELSIUS SCALES is –40°.

 “40

Celsius and Fahrenheit are the same at – 40 DEGREES SINCE the scales CONVERGE.

 1 : 4

The CORRESPONDING ration of VELOCITY of sound in OXYGEN and hydrogen is 1:4.

 It follows the wave path near the tropopause at ELEVATIONS of 8 km to 15 km.

It follows the wave path near the tropopause at elevations of 8 km to 15 km, this STATEMENT is not CORRECT.

 SQUARE of AMPLITUDE

Intensity of any WAVE is PROPORTIONAL to square of amplitude.

 Not Stationary

According to RUTHERFORD's atomic MODEL, the ELECTRONS inside an atom are not stationary.

 1.0

 Hearing aid

A transistor is a SEMICONDUCTOR DEVICE used to amplify or switch electronic signals and electrical power.The transistor invented in 1948 was well SUITED to the hearing aid application due to low power and small size; hearing aids were an early adopter of transistors. Transistors replaced the need for batteries in hearing aids.

 NEGATIVE CHARGE

Electrons CARRY a negative charge.

 ISOTOPE

An ATOM with more NEUTRONS than PROTONS is CALLED isotope.

 J.J THOMPSON

J.J. Thompson was the FIRST SCIENTISTS to DISCOVER ELECTRONS.

 Proton

Proton has a POSITIVE CHARGE.

 Due to refraction

The BENDING of light (i.e. refraction of light) as it moves from water to AIR makes the water tank APPEAR to be less SHALLOWER than its REAL depth.

 3.6 MEGA JOULE

One KILOWATT HOUR is EQUAL to 3.6 Mega Joule.

 Water boils at a higher temperature under pressure.

FOOD is cooked more quickly in a pressure cooker because at the higher pressure (1 bar/15 PSI), the boiling point of water rises from 100°C (212°F) to 121°C (250°F). The hotter steam is ABLE to transmit its thermal energy to the food at around 4 times the rate of CONVENTIONAL boiling.

 Inertia

The inability of a body to CHANGE its state of rest or its UNIFORM motion in a STRAIGHT line is CALLED as Inertia.

 Poles

Gravitational force is MAXIMUM at Poles. The gravitational force is ALMOST EQUAL in every where in the earth. The resultant force is maximum in pole.

 A pair of scissors

Any of the basic MECHANICAL devices for applying a force are CALLED SIMPLE machines.
There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are RELATED to each other. But, each has a specific PURPOSE in the world of doing work. A pair of scissors is not a simple machine.

 Both A & B

Dynamometer type wattmeter is USED for the measurement of A.C. as well as D.C. power. It CONSISTS of a fixed coil forming the CURRENT coil whereas the moving coil forms the POTENTIAL coil.

 Work done in ROLLING a stone is less than in lifting it.

It is EASIER to roll a stone up a sloping road than to LIFT it vertical UPWARDS because work done in rolling a stone is less than in lifting it.

 Refraction

The bending of LIGHT (i.e. refraction of light) as it moves from water to air MAKES the water TANK appear to be less shallower than its real depth.