General Science Degree Level

Which type of mirrors are used to concentrate sunlight to generate high temperature in solar furnaces?

Ans: Concave mirror

▪ The partially lighted area of a shadow on the property of the totally shaded portion is called?

Ans: Penumbra

▪ Who discovered natural radioactivity?

Ans: Henry Becquerel

▪ Name the target elements that are used in the production of X-rays?

Ans: Molybdenum or Tungsten 

▪ _____ are the sources of Infra Red light?

Ans: Very hot bodies

▪ Which colour is obtained when a primary & a secondary colour are mixed together?

Ans: White

 ▪ If a body reflects all the colours fall on it, in what colour does it appear?

Ans: White

▪ Which mirror is used as a reflector in street lights?

Ans: Convex mirror

▪ Which light phenomenon makes the Sun to be risen before the actual sunrise?

Ans: Atmospheric refraction

▪ In a thermal power plant, which energy is transformed into electrical?

Ans: Chemical

▪ What is the shape of the Milkyway galaxy?

Ans:Spiral

▪ One horse power is equal ____.

Ans: 746 W

▪ Which part in AC dynamo is not used in DC dynamo?

Ans: Slip rings

▪ In transmission of electric power which instrument is used?

Ans: Transformer

▪ What is the voltage required for domestic appliances?

Ans: 220 V

▪ Which material core is used in solenoid to make an electromagnet?

Ans: Soft iron

▪ What is the emf of a normal dry cell?

Ans: 1.5 V  

▪ Which is the common unit of measuring calorific value?

Ans: KJ/gm

▪ Among the hydrocarbons, which has the maximum calorific value ?

Ans: Methane

▪ In domestic electric circuits, the red colored insulated copper wire is ___?

Ans: Live

▪ Which device converts mechanical energy into electrical energy?

Ans: Dynamo

▪ Transformer is based on the principle of _____?

Ans: Electromagnetic induction

▪ Which device converts electrical energy into sound energy?

Ans: Loud speaker

• What is used as coolant in nuclear reactor?

Ans: Heavy water

▪ What is the SI unit of current?

Ans: Ampere

▪ In a biomass, which energy is converted into electrical energy?

Ans: Chemical energy

▪ Which device converts electrical energy into mechanical energy?

Ans: Motor

▪ Watt/hour is equal to _____ Joule ?

Ans: 3600 J

▪ Which instrument is used to measure the potential difference?

Ans: Voltmeter

▪ If a mirror has a focal length of +10, then it is a_____ mirror

Ans: Concave mirror

▪ Who invented optical fibre?

Ans: Narinder Kapany

▪ Sound frequenzv below 20 Hz is called ____. 

Ans: Infrasonic

▪ Which type of energy travels through a telephone line?

Ans: Electrical energy

▪ What is the magnetism at the centre of a bar magnet?

Ans: Zero

▪ Which property is indicated by the colour of a star ?

Ans: Temperature

▪ Which metal is used in the galvanization process?

Ans: Zinc

• Which metal is used for making the metal balls used in the fishing nets?

Ans: Lead

▪ What are the examples of the synthetic rubbers?

Ans: Thiokol, Neoprene, Buna-N & Buna S

▪ The heating of rubber with sulphur is known as _____.

Ans: Vulcanisation

▪ Why rubber is vulcanised?

Ans: To make rubber hard, strong & more elastic

▪ What is the commercial name of calcium nitrate?

Ans: Norwegian saltpeter

▪ Which are the important raw materials required for the cement manufacturing?

Ans: Limestone, day & gypsum

▪ Which raw material reduces the setting time of cement?

Ans: Gypsum

▪ Which type of glass prevents the ultra violet rays?

Ans: Crookes glass

• Which metal oxide present in crookesglass cuts ultra violet rays ?

Ans: Cerium oxide

▪ Which acid attacks the glasses?

Ans: Hydroflouric acid

• Which acid is used for the etching of glasses ?

Ans: Hydroflouric acid

▪ Who is associated with the 'Triads classification' of elements?

Ans: Dobereiner

▪ Who formulated 'the law of Octaves' in relation with the classification of elements?

Ans: John Newlands

▪ Who formulated the Periodic Law, which states that the properties of elements are the periodic function of their atomic masses' ?

Ans: Dmitri Mendeleev

▪ In which year was Mendeleev's period table published for the first time?

Ans: 1872

• Who is known as the Father of Periodic Table' ?

Ans: Dmitri Mendeleev

▪ Amalgam is a term used for an alloy of a metal with

Ans: Mercury

▪ In which group of the periodic table is the alkali metals included?

Ans: Group-1

▪ The alkaline earth metals are included in the ____  group of periodic table?

Ans: Group- 2

▪ Which group of periodic table is known as halogen family?

Ans: Group 17

▪ Which group of periodic table include noble gases?

Ans: Group-l8

▪ What is the atomic number of Gold?

Ans: 79

• Which element in the periodic table has the atomic number 54?

Ans: Tin

• Which element has the atomic number 100?

Ans: Fermium

▪ What is formed by mixing concentrated nitric acid & hydrochloric acid in the ratio 1:3?

Ans: Aqua regia

▪ What is known as 999 gold?

Ans: 24 carat

▪ What is 916 gold in jewellery making?

Ans: 22 carat

• White gold is an alloy of gold & at least one white metal, usually ____ ?

Ans: Nickel or palladium

▪ Rose gold is an alloy of gold _____?

Ans: Copper

▪ Green gold is an alloy of gold &____?

Ans: Silver

▪ Sodium salts of fatty acids are known as _____?

Ans: Hard soaps

▪ Soft soaps are the fatty adds of ____ salts?

Ans: Potassium

• Which type of soaps are used for washing purpose?

Ans: Hard soaps

• The detergents are sodium salts of ____?

Ans: Benzene sulfonic acids

▪ Which are the most common fatty acids present in soaps?

Ans: Oleic and Stearic acids

• What is known as 'white vitriol’?

Ans: Zinc sulphate

▪ Chloropicrin is the main content of ____?

Ans: Tear gas

▪ What is known as slaked lime or milk of lime?

Ans: Calcium hydroxide

▪ What is known as 'Indian nitre'?

Ans: Potassium nitrate

▪ What is the chemical name of carborundum?

Ans: Silicon carbide

▪ Sodium nitrate is popularly known as _____?

Ans: Chile saltpetre

▪ In Fahrenheit scale, what is the temperature of ice point?

Ans: 32 degree Fahrenheit

▪ What is the boiling point of water in Fahrenheit scale?

Ans: 212 degree Fahrenheit

▪ in which temperature both Celsius scale & Fahrenheit scales show same reading?

Ans: Minus 40 degree

▪ What is the range of readings in a clinical thermometer?

Ans: 96 to 110 degree F (35 to 43 degree C)

▪ The clinical thermometer measures temperature in ____.

Ans: Degree Fahrenheit (F)

▪ What is the working principle of radiator in a motor car?

Ans: Principle of convection

▪ The process of heat transmission in the form of electromagnetic waves is called ____?  

Ans: Radiation

▪ What are the examples of thermoplastics?

Ans: Polythene, nylon, celluloid & Polystyrene

▪ What are the examples of thermosetting plastics?

Ans: Bak elite, melamine, terylene & glyptal

▪ What is known as 'Artificial silk'?

Ans: Rayon

▪ Which is the first fully synthetic fibre developed in 1931?

Ans: Nylon

• Which polymer is used in making socks, ropes, tooth brushes, seat belts, sleeping bags & ropes for rock climbing?

Ans: Nylon

▪ Who proposed first the system of arranging elements in the basis of their atomic number instead of atomic mass?

Ans: Henry Moseley