Science For You

[Perfection]

How many chromosomes are there in a body cell of human beings ?
46
What is the unit of measuring the energy requirements of human body ?
Calorie
Where is the thyroid gland located ?
At the back of neck
What is the average volume of a human brain ?
1500 cubic centimeter
How many bones are there in the spinal column ?
33 bones
What is the wall of a plant cell made of ?
Cellulose
What name is given to the living jelly-like substance in plant cells ?
Cytoplasm
What is the name given to the green pigment in plants?
Chlorophyll
Which are the most sensitive to stimuli-plants or animals ?
Animals
What is the common name for 'Vicia Faba' ?
Broad bean

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Science

Which instrument is used for measuring Humidity in air?
Spherometer

Which instrument is used for measuring the growth of plants?
Crescograph

Which instrument is used to measure the magnitude and the direction of magnetic field?
Magnetometer

Which instrument is used for measuring the velocity and finding the direction of the wind?
Anemometer

Which instrument is used for navigating ships?
Sextant

Which instrument is used for recording sound under water?
Hydrophone

Which instrument is used for converting sound?
Micrometer

Which instrument is used for Measuring relative humility of atmosphere?
Hygrometer

Which instrument is used to study the different absorption of light by a liquid?
Spectrophotometer

Which instrument is used for to measuring temperature changes?
Thermoscope

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Science

Which instrument is used for measuring temperature of human body?
Clinical Thermometer

Which instrument is used for measuring radiant heat?
Bolometer

Which instrument is used to compare the intensities of two sources of light?
Photometer

Which instrument is used in Land Surveying for measuring angels horizontally and vertically?
Theodolite

Which instrument is used for check up whether a cell is generating current or not?
Galvanometer

In an ordinary light bulb filament is made of
Tungsten

Who conducted the experiment that produced vacuum for the first time?
Blaise Pascal

Who discovered electricity in lightning?
Benjamin Franklin

The blue colour of the sky is due to
Refraction of light

Which is unit frequency?
Hertz

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Science

A mixture of which gases is used in the manufacture of electric bulbs?
Oxygen an Argon

The branch of Physics which deals with the measurement of light is called
Photometry

Who invented lift?
E.G Otis

What kind of mirror is used for view?
Convex mirror

Who invented radio?
Marconi

Which elementary particles are in equal mass?
Neutron and proton

Which of the flowing transformations of energy takes place in a microphone?
Sound into electrical energy

For which purpose a transformer is used?
Conversion of low voltage into high voltage and vice-versa

What does “Angstrom” measure?
Length of light waves used for

Which instrument is detecting and measuring small currents?
Galvanometer

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Science

The rod in the dry cell, which act as the positive terminal, is made of
Carbon

Which instrument is used for measuring solar radiations?
Pyrheliometer

Which instrument is used for precise measurement of refractive indices?
Spectrometer

Which is used for controlling the chain reaction in nuclear reactor?
Molecules of high energy

Who discovered the law of attraction and repulsion between electric charges?
Coulomb

The lightning conductor used for protection buildings from lightning is made of
Copper

By the use of which lens myopia be corrected?
Concave

Which particle is emitted by the filament of a vacuum tube?
Electrons

Which is used as a electrolyte in chromium plating?
Chromic acid solution

The transformer works on which principle?
Electro magnetic induction

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Science

The Indian scientist who put forward the theory of thermal ionization was
Meghanath Saha

The sound waves which can not heard by a human ear are called
Infrasonic and Ultra sonic sounds

Why is Tungsten used for the manufacture of the filament of an electric bulb?
Because it has a very high melting point

Newton’s Law of gravitation apples to
Both small and big bodies

The direction of the conventional current in a diode is
Plate to Cathode

The light of which colour has the longest wavelength?
Red

Which is the unit to measure supersonic speed?
Mac

Which is the unit of force?
Newton

How is energy produced in the sun?
By nuclear fusion

Which is the element without neutron?
Hydrogen

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Science

Which non-metal conducts electricity?
Carbon

Which alloy is used for making permanent magnet?
Steel

Which gas is used in ice plants?
Ammonia

Which is the S.I. Unit of heat?
Calorie

Which poisonous gas produced when PVC is burned?
Dioxin

Who invented the calculating machine?
Blaise Pascal

What is a Femto second?
A Femto second is a millionth of billionth of second

What is “zero energy”?
The energy that exists in atom is zero energy

Who invented the pendulum of clock?
Galileo

Who invented the Cellophane?
J.Brander perger

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Science

Who invented the bicycle?
Kirk Patrick Macmillan

Which is the fourth state of matter?
Plasma

Who invented atomic bomb?
J.Robert Oppenheimer

What is the unit or audible frequency of sound for human beings?
From 20 hertz to 20000 hertz

Which is the first artificial element that man made?
Neptunium

Who made the first artificial element?
Macmillan and Ebelson

Who was the first to prove that atom can be broken?
Rutherford

What is the unit of electric charge?
Coulomb

Which apparatus regulates temperature automatically?
Thermostat


Which is the metal used in storage batteries?
Lead

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Science

Which gas is the cause of “Green house effect”?
Carbon dioxide

Who made the first atomic reactor?
Enrico Fermi

Who invented the bifocal lens?
Benjamin Franklin

Which instrument is used for measuring velocity and pressure of wind?
Anemometer

What is the use of an Electro Encephalograph?
To test the working of brain cells

Who invented adding machine?
Wihelm Schickard

Which is the unit of magnetic flux?
Weber

What is Venturi tube?
It is a device to measure flow of liquids and their pressure

Who invented photo electric effect?
Hertz

Who was the first chairman of Atomic Power Commission?
Homi J.Babha

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Science

Which is the instrument used to change Alternating Current (AC) into Direct Current(DC)?
Rectifier

What is the speed of sound in air?
340m/s

Which is the first instrument that man used?
Stone

Which is the alloy having the least metal?
Invar steel

What kind of lens is used in the eye defect, ‘Astigmatism”?
Cylindrical lens

Which is the gas filled in the electric bulb?
Argon

Which wave has the most wave length?
Radio wave

Who invented printing?
J.Guttenberg

Which light ray that has the capacity to cut metals?
Laser

What is the specific gravity of water?
1