Competitive Exams Challengers

23/12/2024

🎯অনুপাত ও সমানুপাত | Ratio and Proportion |Class 01|

🎯অনুপাত ও সমানুপাত | Ratio and Proportion |Class 01|

02/12/2024

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28/11/2024

🎯অনুপাত ও সমানুপাত | Ratio and Proportion |Class 01|
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24/11/2024

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16/11/2024

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16/11/2024

16/11/2024

পাটিগণিত Introduction Class | Subir Das Math Book Solution | সুবীর দাস সমাধান |



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পাটিগণিত Introduction Class | Subir Das Math Book Solution | সুবীর দাস সমাধান
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22/10/2024

আজ 9.15 pm থেকে mathematics লাইভ ক্লাস শুরু হবে । তোমরা সবাই সঙ্গে থেকো
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12/10/2024

RRB NTPC : General Science Questions (Physics, Chemistry & Biology)
General Science is a very important part of various Railway Exams like RRB NTPC, RRB Group D, RRB JE, etc. In this article, basic questions on various sections of General Science syllabus like Physics, Chemistry, Biology are asked.

Physics
Q1) Blades of a windmill possess, hence they are turned by a fast wind.

Ans -: Potential Energy

Q2) A dark-skinned man experiences, as compared to a fair-skinned man.

Ans -: Less heat & Less cold

Q3) What device is used to break/complete an electronic circuit?

Ans -: Switch

Q4) What is the temperature at which both the Fahrenheit and the centigrade scales have the same value?

Ans -: -40°

Q5) Acceleration acts always in the direction of the .

Ans -: Net force

Q6) The principle used in working of an atom bomb is _________.

Ans -: Nuclear Fission

Q7) What is the unit used to measure the depth of sea?

Ans -: Fathom

Q8) Astigmatism can be corrected by .

Ans -: Cylindrical lenses

Q9) Lambert’s Law is related to .

Ans -: Illumination

Q10) In a Battery, which energy is converted into Electrical energy?

Ans -: Chemical Energy

Q11) The longitudinal mechanical waves of less than 20Hz are called .

Ans -: Infrasonic

Q12) Distance of stars are measured in ?

Ans -: Light Years

Q13) Albert Einstein was awarded the Noble prize for .

Ans -: Photoelectric Effect

Q14) Electric Motor converts the Electric energy into .

Ans -: Electric energy to Mechanical energy

Q15) Robert Koch has invented the .

Ans -: Electron microscope

Q16) Force of attraction between the molecules of different substances is called .

Ans -: Adhesive Force

Q17) Electrons in Good conductors are .

Ans -: loosely bound

Q18) One barrel of oil = litres. (approximately)

Ans -: 159

Q19) If a bar magnet is cut length wise into 3 parts, what will the total number of poles be?

Ans -: 6

Q20) If the body is hollow, then its centre of gravity lies?

Ans -: Outside the material

Q21) If the temperature inside a room is increased, the relative humidity will .

Ans -: Decrease

Q22) In summer, the mirages are seen due to the phenomenon of .

Ans -: Total Internal Reflection

Q23) In the visible spectrum which colour has the longest wavelength?

Ans -: Red

Q24) In which medium sound travels faster?

Ans -: Solid

Q25) Insects can move on the surface of water without sinking due to .

Ans -: Surface tension of water

Q26) The Laws of Electrolysis were proposed by –

Ans -: M Faraday

Q27) Light travels in a .

Ans -: Straight line

Q28) What is used as a cooling agent in most of the world’s commercial nuclear power plants?

Ans -: Water

Q29) Nature of sound wave is ?

Ans -: Longitudinal

Q30) 1 fermi unit is equal to –

Ans -: 10⁻¹⁵m

Q31) How many basic S.I. units are there?

Ans -: Seven

Q32) What is the principle on which a transformer works?

Ans -: Mutual Induction

Q33) The distance between Earth and Sun is termed as –

Ans -: 1 Astronomical unit

Q34) Potential energy of your body is minimum when you .

Ans -: Lie down on ground

Q35) What is the freezing point (temperature) of Pure water?

Ans -: 32 F

Q36) What is the unit of measurement of an Angle?

Ans -: Radian

Q37) Radio waves of constant amplitude can be generated with an .

Ans -: Oscillator

Q38) Hooke’s law is related to

Ans -: Elasticity

Q39) Sudden fall in barometer is indication of .

Ans -: Storm

Q40) Water moving up a straw is an example of .

Ans -: Capillary Action

Q41) The blue colour of the clear sky is due to .

Ans -: Dispersion of Light

Q42) What is a magnetic field’s direction within a magnet?

Ans -: From South to North

Q43) The experiment demonstrating the existence of electromagnetic wave was first conducted by

Ans -: Heinrich Hertz

Q44) The filament string in an electric bulb is made of which metal?

Ans -: Tungsten

Q45) Drag is the force exerted by fluids.

Ans -: Friction

Q46) The hydraulic brake used in automobiles is a direct application of .

Ans -: Pascal’s Law

Q47) The image formed by convex lens in a simple microscope is .

Ans -: Virtual & Erect

Q48) What kind of mirror is used in motor vehicles near the driver’s seat?

Ans -: Convex Mirror

Q49) & are present in the nucleus of an atom.

Ans -: Neutrons and protons

Q50) The size of atomic nucleus is of the order of .

Ans -: 10⁻¹⁵ m

Q51) From the moon’s surface, Astronauts see a Black Sky. This is because of .

Ans -: Absence of Atmosphere on Moon

Q52) The specific resistance of a wire varies with its .

Ans -: Material

Q53) The speed of light will be decreased with the rise in the temperature of the medium. True or False.

Ans -: False. (It remains unchanged)

Q54) Which is the strongest force in the nature?

Ans -: Nuclear Force

Q55) Which device is used to measure the temperature of the sun?

Ans -: Pyrometer

Q56) Which phenomenon occurs when light passes from a denser to rarer medium?

Ans -: Total Internal reflection

Q57) Which substances do not allow flow of charge through them?

Ans -: Insulators

Q58) The value of which quantity remains same in all system of units?

Ans -: Specific Gravity

Q59) What is the speed of sound in air?

Ans -: 332m/sec

Q60) The working of the quartz crystal in the watch is based on which effect?

Ans -: Piezoelectric Effect

Q61) Permanent magnets are made of .

Ans -: Steel

Q62) During a fog, the visibility is reduced. This is because of which phenomenon?

Ans -: Scattering of light

Q63) Weightlessness experienced in a spaceship is due to .

Ans -: Absence of Gravity

Q64) Which device is used to find submerged objects?

Ans -: SONAR

Q65) What converts the alternating current into direct current?

Ans -: Rectifier

Q66) Which element is used as a moderator in nuclear reactors?

Ans -: Graphite

Q67) Which device converts light energy into electric energy?

Ans -: Photoelectric cell

Q68) The unit of power of lens is called .

Ans -: Dioptre

Q69) What is the unit of Radioactivity?

Ans -: Curie

Q70) An object has to attain the velocity of to escape from earth’s atmosphere?

Ans -: 11.2 km/sec

Q71) What is the measuring unit of length of light waves?

Ans -: Angstrom

Q72) A short duration wave is known as –

Ans -: Pulse

Q73) When did Einstein propose that matter can be converted into energy?

Ans -: 1905

Q74) What is the SI unit of luminous intensity?

Ans -: Candela

Q75) What is the unit of magnetic flux?

Ans -: Maxwell

Q76) What is the unit of specific resistance?

Ans -: Ohm-metre

Q77) The wavelength of visible spectrum ranges from .

Ans -: 390-700 nanometres

Q78) A Washing machine works on the principle of –

Ans -: Centrifugation

Q79) When a ball is thrown upward, what happens to its Acceleration?

Ans -: It remains Constant

Q80) Magnifying glass is made of which type of lens?

Ans -: Convex lens

Q81) What colour will a red glass appear if it is heated in dark room?

Ans -: Green

Q82) What happens to the surface tension of the water when a detergent is added to it?

Ans -: Decreases

Q83) The value of ‘g’ (acceleration due to gravity) is maximum at ?

Ans -: at poles

Q84) Which instrument is used to measure altitudes in aircrafts?

Ans -: Altimeter

Q85) Which instrument is used to measure change in volume of substances ?

Ans -: Dilatometer

Q86) Which instrument is used to measure depth of ocean ?

Ans -: Fathometer

Q87) The power of electric circuit is measured with a .

Ans -: Wattmeter

Q88) Which instrument is used to measure the scattering of light by particles suspended in a liquid?

Ans -: Nephelometer

Q89) Which is more elastic – Steel or Rubber?

Ans -: Steel

Q90) Which is the only natural magnet?

Ans -: Magnetite

Q91) What Principle is used in the designing of ships and submarines?

Ans -: Archimedes Principle

Q92) Nuclear Fissions are initiated by .

Ans -: Neutrons

Q93) The wire in an electric heater is made up of .

Ans -: Nichrome

Q94) During Sonography which types of Waves are used?

Ans -: Ultrasonic waves

Q95) Diode Bulb was discovered by .

Ans -: Sir J. S. Fleming

Q96) Who gave the first experimental value of G?

Ans -: Cavendish

Q97) Who had showed that the electric and magnetic waves are equal in vacuum?

Ans -: James Clerk Maxwell

Q98) What is the escape velocity of Moon?

Ans -: 2.38 Km/s

Q99) Why does a liquid drop tend to assume a spherical shape?

Ans -: To minimize surface tension

Q100) Resistance of a Conductor is inversely proportional to it’s .

Ans -: Cross Sectional Area

Chemistry
Q1) What is used in nuclear reactor as a moderator. It is also known as Heavy Water?

Ans -: Deuterium Oxide (D2O)

Q2) Which Metal is in liquid state at room temperature?

Ans -: Gallium

Q3) elements are non-metal.

Ans -: Electro-negative

Q4) What is known as Artificial Silk.

Ans -: Rayon

Q5) Nitrous Oxide (N2O) is also known as –

Ans -: Laughing Gas

Q6) Which compound is used to prepare water proof clothes?

Ans -: Calcium hydride

Q7) Which Nobel Gas is also known as ‘Stranger Gas’?

Ans -: Xenon

Q8) Which Acid is know as ‘Oil of Vitriol’?

Ans -: Sulphuric acid

Q9) For making of parachute, which polymeric substance used?

Ans -: Viscose

Q10) Acid rain is caused when the air is polluted by Gases.

Ans -: Nitrous Oxide & Sulphur dioxide

Q11) All noble gases are & .

Ans -: Colourless and Odourless

Q12) is used as a Water Purifier.

Ans -: Alum

Q13) Aluminium is extracted from which ore?

Ans -: Bauxite

Q14) The Process is used to synthesized Ammonia (NH3)?

Ans -: Haber’s Process

Q15) Which compound/acid commonly known as Aspirin?

Ans -: Acetyls

10/10/2024