TNPSC - Physics Exam material Part 3

                                          Physics Exam material for TNPSC - PART 2

The ratio of the linear stress to the linear strain of a body is called --- Young's modulus

For the same total weight and the same fuel supply, a multistage rocket is preferred to a single stage rocket, because --- multi stage rocket is safer to launch

627^oC can be expressed as --- 300K

When two resistors , each of value 10 ohms, are connected in parallel, what is the effective value of the combination?  --- 5 ohms

In optics, the relation between u,v and f is --- 205

The half - life period of C₁₄ is 5600 years what is the time required for C₁₄  to become 1/4th of its initial size ? --- 11,200 years

Light years is the unit of --- distance 

If an object weighs 60 kgm - wt on earth, its weight on the surface of the moon will be --- 10kgm-wt

A small drop of mercury is spherical due to --- surface tension

The unit of power of a lens is --- diopter

The smallest planet in the solar system is --- pluto

The time taken by light to travel from the sun to the earth is --- 8.33 min

A convex lens forms an image of a distant object on a screen. If the upper half of the lens is blocked by a piece of paper --- the lower half of the image will be cut off

A transformer --- generates induced e.m.f

In general, when the temperature of a metal is raised, its conductance --- remains the same

"1 Kilowatt - hour " is the unit of --- power

Satellite Communication --- Micro waves

Discending order of wavelength (long to short)

Micro waves

Infra - red

Ultra-violet

Gamma rays

Important Points 

Ionosphere - E.V.Appleton

Black holes - S.Chandrasekar

Electric battery - Volta

Electro magnetic waves - Hertz

Important Points 

Ultrasonic waves are used for finding molecular

Chemical effects are produced by ultrasonic waves

The colour of outer edge of rainbow will be --- violet

When seen through a piece of red glass the green leaves will appear --- bluishtint

A substance is coloured due to the absoption of --- UV rays

Important Points 

Anemometer - Velocity of Wind

Hygrometer - determine humidity of air

Photometer - determine the light intensity

Lactometer - determine the purity of milk

Radar - detect flying object

Proper sequence of colours --- violet-blue-red

1 micron ( ) is --- 10^-6meter - 228

Tiruchirapalli station of All India Radio Broadcast at a frequency of 1 mega hertz. This is equivalent to --- 10⁶hertz

Waves produced on the surface of water is --- transverse 

Radioactivity may be --- natural and artificial

Bending of light around an obstacle is due to --- Diffraction

The splitting of different colours in a prism is called --- Dispersion

A speaker converts --- electrical energy into sound energy

The spectrum of a source of light is called --- Emission spectrum

X-rays carry --- unit negative charge

The waves received by our television sets are --- microwaves

The relation amongst velocity (V), frequency (n) and wave length () is  - 238

The heavy water project is located at --- Tuticorin

Important Points

Girders are always of 1 - shaped in order

The heat of neutralisation is constant for --- strong acid - strong base

Melting point of ice is --- 0^oC

Watt = Volt x ampere

The material which is used to make permanent magnets is --- steel

When fast moving electrons are stopped suddenly by a metal target --- x - rays are produced

Liquid metal is --- mercury

Important feature of the desert is --- sand storm

The period of seconds pendulum is --- 2.0 seconds

The excess pressure applied at a point inside a liquid at rest is distributed equally in all directions. The principle is know as --- Pascal's Law

Important Points

If work is to be done, a force must be exerted on the body

The force must produce motion or displacement

Epidiascope is an instrument ---- for projecting film on a screen

The image formed on the retina of a human eye is --- Real and inverted

A lunar eclipse occurs when --- the earth comes between the sun and the moon

Conversion from the liquid state to gaseous state --- sublimation

In a tape recorder the sound is recorded on the tape as --- variable magnetic field

Pipe instrument without reeds is --- Flute

Beta () particle is --- negatively charged particle 258/

Rate of change momentum --- force

Unit of force in the M.K.S  system is --- Newton

One unit if electrical energy consumption is equal to --- 1000 watt per hour

At sunrise and at sunset the sky appears red, because --- red light's intensity is more

68^o fahrenheit is equal to ---- 20^oC

The force of attraction between planets was correctly given by --- Kepler

A boat moves forward when water is pushed back. The basic physical law applicable here is --- Newtons third law of motion

The mass of 5 litres of mercury is ---68 kg

Which of the following cannot pass through vacuum --- sound

In a dynamo --- mechanical energy is converted into electrical energy

Induced e.m.f. is directly proportional to --- rate of change of momentum

In a step-up transformer, the number to turns --- in the secondary is more that in the primary

Can D.C. voltage be used in a transformer --- no

The condition for total internal reflection of light is , a ray must --- pass from denser to rarer medium

pH of neutral water is --- 7

Elements having different atomic number but same atomic weight are called --- Isobars

The maximum displacement of a vibrating body from its mean position is called --- Amplitude

A ball weighting 25g is thrown vertically into the air. It takes 15 sec to reach its highest point. How mush time would it take to reach the ground from its highest point ? --- 15 sec.

Important Points

Graphite is an allotrope of carbon

Which of the following regulates and controls the entry of light into human eye ? --- iris

The Bowman's capsule functions as a --- filter

The distance between the earth and the sun is maximum when the earth is in --- aphelion

Temperate cyclones bring along with them --- thunder storm and torrential rains

Which substance is used to make rubber strong ? ---- Sulphur

Nucleus of an atom has --- proton and neutrons

Sea water turns into ice at what temperature ? --- 4^oC

For galvanizing iron, which of the following is used ? --- Zinc

The gas used to fill in baloons other than hydrogen --- helium

The animal which was sent on to the space in rockets for the first time --- dog

The average rate of heart beat in a normal human being --- 72

The weight of a body is --- maximum at the poles

A person climbing a hill bends forward in order to --- increase stability

In milk fat content is reduced during --- winter

A swimmer finds it easier to swim in sea water than in plain water. why?  --- Sea water has higher density than plain water

Perspiration is maximum when --- temperature is high and air is humid

Name the organism which files with the help of ultrasonics --- owl

Dry ice is --- Solid methane

Instrument used to measure earthquake shocks --- Anemometer

One horse power is equal to --- 744 watts

Mercury boils at --- 357^oC

The purity of milk is measured with --- Galvanometer

Instrument used in a submarine to see over the top when it is submerged --- Epidiascope