QUESTION BANK

      QUESTION BANK

Class : 7 & 8

ASTRONOMY

1) Which is the brightest heavenly body of the night sky?

Ans –Venus

2) Which is the brightest star of the night sky?

Ans – Sirius

3) For which planet, is a Day longer than a Year?

Ans –Venus

4) Axis of which planet is highly tilted towards the Sun?

Ans –Uranus

5) Which planet is often called a Failed Star?

Ans – Jupiter

6) Which planet contains the largest volcano in the Solar System?

Ans –Mars

INTERNATIONAL DAYS

1) When is World Water Day celebrated?

Ans –22nd March

2) When is  World Earth Day celebrated?

Ans – 22nd April

3) When do we celebrate Vana  Mahotsav?

Ans – 1st  week of July

WATER

1) Most of the freshwater on the Earth is present in :

Ans –Glaciers and Ice Caps

2) Collective term used to describe condensation of all atmospheric water vapors like rain, snow and hail is called:

Ans –Preci[pitation

3) An underground layer of permeable rock that is permanently saturated with water and which can hold large quantities of water in its gaps and cracks is called:

Ans –Aquifer

NUTRITION IN ANIMALS

1) Enzyme present in the saliva to digest carbohydrates present in foods is called:

Ans –Salivary Amylase (Ptyalin)

2) What is the end product of the Carbohydrates present in our food after broken down into simpler forms by the process of digestion?

Ans – Glucose

3) Which part of the Alimentary canal does absorb most water from food into our bloodstream?

Ans – Large Intestine

MIRRORS

1) How many images are seen between two parallel mirrors?

Ans –Infinite

2) How many images are seen in two mirrors having 90 degree angle between them?

Ans – 3

3) Name of the device used in a submarine to view objects on the surface of the water:

Ans –Periscope

                                                                

HEAT

1) Heat transfer in metals takes place due to a process called: 

Ans –Conduction

2) How does the Sun’s heat reach the Earth?

Ans – Radiation

3) What is the highest temperature that a Laboratory thermometer can read?

Ans –110 deg C

NAME OF INSTRUMENTS

1) An instrument used to measure the wind speed:

Ans –Anemometer

2) An instrument used to measure atmospheric pressure:

Ans –   Barometer

3) An instrument used to measure the  Intensity of the  Earthquake:

Ans –Seismograph

UNITS

1) Which unit is used to measure distances in the sea?

Ans –Nautical Mile 

2) Which unit is used to express the speed of a ship in the sea?

Ans –  Knot

3) Which unit is used to measure the percentage of purity in a sample of Gold?

Ans –Carat

INVENTIONS  & DISCOVERIES

1) Who invented Telescope?

Ans –Hans Lippershey

2) Who first attempted to measure the circumference of the Earth?

Ans – Eratosthenes of Greece

3) Who first propounded that most diseases are caused due to microorganisms?

Ans –Louis Pasteur

STARS & THE SOLAR SYSTEM

1) What is the name of the largest Moon of Jupiter?

Ans –Ganymede

2) What is the name of the largest Moon of Saturn?

Ans – Titan

3) What is the rank of the Earth in size in the planets of the Solar System?

Ans –5th 

4) Which planet is often called the ‘Twin Sister of the  Earth’ due to its similarity in size?

Ans – Venus

5) Which is the densest planet in the Solar System?

Ans – Earth

6) Which planet has an average density less than that of water?

Ans –Saturn

7) The two beginning stars in Ursa Major are called the Pointer stars. Their actual names are:

Ans –Dubhe & Merak 

8) If we join the three bright stars of the hunter-shaped Orion's belt and extend the line towards the East, we will meet another very bright star. What’s its name?

Ans –Sirius 

9) This constellation is imagined as a lady sitting on a chair:

Ans –Cassiopeia

10) Which planet is never seen in the sky at midnight?

Ans –Mercury and Venus

11) Which planet shows phases like the Moon?

Ans –  Venus

12)What is the distance of our nearest star Proxima Centauri?

Ans –4.3 lightyear

13) How much time does light take to reach Earth from the Moon?

Ans –1.3 seconds

WEATHER, CLIMATE, AND ADAPTATION OF ANIMALS AND PLANTS TO CLIMATE

1) Which region of the world does support the maximum biodiversity population?

Ans – Tropical RainForests

2) Where are the Tropical Rain Forests found in India?

Ans – Western Ghats & Assam

3) How do the large ears of elephants of the Indian tropical rainforest help them to survive the harsh (hot & humid) climate of a tropical rainforest?

Ans –They use their ears like fans to cool themselves

4) The lion-tailed macaque lives in the rainforests of India and is mostly a tree dweller and rarely comes to the ground. Where is it generally found?

Ans – Western Ghats.

5) Polar Bears have a thick (4-inch) layer of blubber under their skin to prevent the heat from escaping from their body. Of what this bubbler is generally made?

Ans – Fats

6) When is the maximum temperature of a day recorded?

Ans –Afternoon 

7) When is the minimum temperature of a day recorded?

Ans – Early Morning

CONSERVATION OF PLANTS & ANIMALS

1) Large areas of protected land for the conservation of wildlife, plant and animal resources and the traditional life of the tribals living in their own area are called?

Ans –Biosphere Reserve

2) Which is the first Reserve Forest established in  India?

Ans – Satpura  National Park

CELL

1) Which is the largest cell of the human body?

Ans –Nerve cell (Neurons)

2) What is the name of green Plastids found in plants?

Ans – Chloroplast

SOUND

1) Loudness of Sound is expressed in a unit called:

Ans –Decibel 

2) What is the range of frequencies of hearing for the human ear?

Ans – 20 Hz to 20,000 Hz               

NATURAL SOURCE OF ACIDS  

1) Which acid is present in unripe mangoes, tamarinds  and grapes?

Ans –Tartaric acid 

2) Which acid is present in Ant bites?

Ans – Formic Acid ( Methanoic acid)

3) Which acid is present in an apple?

Ans – Malic Acid 

4) Which acid is present in curd and sour milk?

Ans –Lactic Acid 

5) What are produced during a neutralization reaction between an Acid and Base?

Ans – Salts, Water & Heat 

6) When soil is acidic due to acid rain, what is generally added to neutralize the acidity?

Ans – Lime 

MOTION AND TIME

1) Time period of a Simple Pendulum depends on the:

Ans –Length of the pendulum

2) The device which is used to measure the distance traveled by a  vehicle is named:

Ans – Odometer

3) In which unit, the age of the stars are generally measured?

Ans – Billion years

4) The Distance-Time graph for the motion of an object moving with constant velocity  resembles a:

Ans –Straight-line

5) In a sundial, the triangular piece of cardboard that is used to cast shadow on the dial  is called:

Ans –Gnomon

6) In India, timekeeping services are provided by an organization based in Delhi named NPL. What’s its full form?

Ans – National Physical Laboratory

NATURAL PHENOMENA

1) The point on the Earth’s surface directly above the point of origin of the Earthquake is called:

Ans –Epicenter

2) A point inside the Earth’s surface where the Earthquake originates is called:

Ans – Focus

3) The Earth‘s surface is supported by many gigantic plates called:

Ans – Tectonic Plates

4) The boundaries of Tectonic plates are weak zones where earthquakes are more likely to occur. These zones are called:

Ans –Fault Zones

ENVIRONMENT

1) Which animal is the symbol of WWF?

Ans –Giant Panda

2) Which animal is most threatened due to the Arctic Ice melt?

Ans – Polar Bear

3) A book brought out by the IUCN that contains a list of the rare and endangered species of plants and animals named:

Ans – Red Data Book

4) Which is the largest mangrove ecosystem in the world?

Ans – The Sundarbans in India

SPACE EXPLORATION 

1) Who was the first man to go to space?

Ans –Yuri Gargain 

2) Who was the first woman to go to space?

Ans – Valentina Tereshkova 

3) Who was the first Indian to go to space? 

Ans –Wing Commander Rakesh Sharma 

 FATHERS OF SCIENTIFIC DISCOVERIES

1) Who is regarded as the Father of the Green Revolution in India?

Ans – Dr. M.S. Swaminathan

2) Who is regarded as the Father of India's Space Programme?

Ans –  Dr. Vikram Sarabhai

3) Who is regarded as the Father of the White Revolution in India?

Ans – Dr Verghese Kurien

CHEMICAL EFFECTS OF ELECTRIC CURRENT 

1) When we pass electricity to a solution of  CaSo4 Copper is deposited over which electrode connected to the battery?

Ans –Negative Electrode

2) Coating of which metal is generally deposited over Iron to prevent it from corrosion and rusting?

Ans – Zinc

3) Who first observed that electric current flowing through a conducting wire produces a magnetic field?

Ans – Hans Christian Oersted 

                                                                     

4) It glows like a bulb; but not a bulb. It is a diode that emits light. What is it?

Ans – LED

5) When an electric current is passed through the water with two electrodes immersed in it, what gas is evolved at the electrodes connected to the negative terminal of the battery?

Ans –Hydrogen

REPRODUCTION

1) The animals which lay eggs are called:

Ans –Oviparous animals 

2) The transformation of tadpoles into adults through drastic changes in their bodies  is called:

Ans – Metamorphosis

LIGHT 

1) Splitting of white light into its seven constituent colours by a prism is known as:

Ans –Dispersion

2) The parallel rays of light reflected from a rough surface are not parallel. Such a kind of reflection is called Irregular reflection. What is the other name of it?

Ans – Diffused Reflection

FRICTION

1) The Force required to overcome friction at the instant an object starts moving from rest is a measure of the frictional force called:

Ans –Static Friction

2) When an airplane moves through the air, it experiences a frictional force exerted by air. Such a frictional force is called a:

Ans – Drag

COMBUSTION & FLAMES

1) The amount of Heat energy produced on complete combustion of 1 Kg of fuel is called:

Ans –Calorific Value

2) Which unit is used to express the calorific value of a fuel?

Ans – KJ/Kg

TELL ME WHY

1) Why do winds blow?

Ans –Caused by the uneven heating of the Earth by the Sun creating regions of low and hugh pressure.

2) Why do waves form in the sea?

Ans –Due to the action of wind

  TELL ME HOW

1) How do we see the same phase of the Moon?

Ans – For Moon, the time to rotate once on its axis is equal to the time to orbit once around Earth (27.3 days)

2) How are so many craters are formed on the Moon?

Ans – They are  formed due to meteorite impacts 

    QUESTION BANK

                                                Class: 9 & 10

GRAVITATION 

1) When the distance between the two bodies increases 3 times, what happens to the Force between them?

Ans –Decrease 9 times  

2) Who pronounced the three Laws of Planetary motion?

Ans – Johannes Kepler 

3) How are the tides caused?

Ans – Combined gravitational attraction of the Sun and the Moon

4) Who first conducted an accurate experiment to determine the value of G?

Ans –Henry Cavendish 

5) The acceleration due to the gravity of a planet depends upon its:

Ans – Mass & Radius 

6) On Earth, when can the weight of a person become zero?

Ans – During Free Fall

FORCE AND LAW OF MOTION

1) Which is regarded as a quantitative measure of the Inertia of a body?

Ans –Mass 

2) Why do the Action and  Reaction pair of forces not cancel each other?

Ans – Because they act on different bodies 

3) Who first, by observing the motion of marbles rolling down an inclined plane, deduced objects move with constant speed when no Force acts on them?

Ans – Galileo

ATOM

1) How many times an Ozone molecule is heavier than an Oxygen molecule?

Ans –1.5 times 

2) Which element is universally chosen as the standard reference for measuring the Atomic masses of elements?

Ans: C-12

3) The chemical formula of the molecular compound of an element is determined by their:

Ans –Valencies

EARTH 

1) Earth’s core is primarily composed of:

Ans – Nickel and Iron (Nife)

2) What is the state of matter in the Earth’s core?

Ans – A solid inner core surrounded by a molten outer core.

3) What is the true shape of the Earth?

Ans – Oblate Spheroid

INDIA’S ACHIEVEMENT IN SCIENCE AND TECHNOLOGY 

1) Name of  India’s first nuclear-powered submarine launched in 2009:

Ans –INS Arihant

2) What was the code name of the second nuclear test carried out by  India in 1998 in the Army’s Pokhran range of Rajasthan?

Ans – Operation Shakti 

3) Name of the World’s fastest and most formidable anti-ship supersonic cruise missile developed by India:

Ans –BrahMos

 HEAT & TEMPERATURE 

1) At what temperature, do both the Fahrenheit and Celsius scales give the same reading?

Ans: -40 deg C

2) The study and production of very low temperature is called:

Ans –Cryogenics

3) An instrument used to measure very high temperatures is called:

Ans –Pyrometer

SOUND

1) What kind of waves are Sound waves?

Ans –Non-mechanical Longitudinal Wave

2) What should be the minimum distance between the source of Sound and the obstacle to hear a distinct echo, assuming that the speed of Sound in the air at 22 deg C is 344 m/sec.?

Ans – 17.2m

3) The  Loudness or Softness of a sound ( and, hence, the Energy carried by it) is determined by its:

Ans –Amplitude

ACIDS, BASE AND SALTS 

1) When an ant bites, it injects an acidic liquid into our skin,  that causes irritation. The effect can be neutralized by rubbing with a Calamine solution. What is the chemical present in the Calamine solution?

Ans –ZnCO3

2) What is the acid present in Vinegar?

Ans –   Dil  Acetic Acid

3) What is the chemical present in Milk of Magnesia, the antacid used to neutralize the excess of acid secreted by our stomach causing stomach burn?

Ans –Mg(OH)2

FUNDAMENTAL UNIT OF LIFE

1) Which organism lacks any membrane, and, hence, does not show characteristics of life until it enters a living body to use its cell types of machinery to grow and multiply?

Ans –Virus

2)  Who first presented the Cell Theory that plants and animals are made up of cells which are the basic unit of life?

Ans –  Schleiden & Schwan

3) Which are the strange cell organelles in the cell that have their own DNA, Ribosomes and,  hence, are able to make some of their own proteins?

Ans –Mitochondria

4) Which process plays an important role in the exchange between the cell and its external environment?

Ans –Diffusion

5) The Plant Cell wall is generally composed of a complex substance that provides structural strength to the Plants. Name it:

Ans – Cellulose

6) Why does the Rough ER look rough?

Ans –Because of the presence of Ribosomes on its surface

7) Which cell organelle in plants provides turgidity and rigidity to the cell?

Ans –Vacuole

8) Which cell organelle functions both as a passageway for intracellular transport and as a manufacturing surface site?

Ans – Endoplasmic Reticulum

WHY DO WE FALL ILL

1) Malaria is caused by a microbe of type:

Ans –Protozoa

2) Who introduced vaccination?

Ans – Edward Jenner

3) Which part of the human body is first invaded by the Malaria parasite?

Ans –Liver

MATTER IN OUR SURROUNDINGS

1) The Kinetic energy of random motion of particles of gas increases with the increase of their:

Ans –Temperature

2) Name the process by which a solid changes directly to the gaseous form without undergoing the intermediate liquid phase:

Ans –Sublimation

3)The process of change of a liquid into vapour state at any temperature below its boiling point is called:

Ans –Evaporation

4) A state of matter consisting of super energetic particles and super excited particles mostly in ionized gaseous form is called:

Ans – Plasma

5) A change of state, directly from gas to solid, without passing through the intermediate liquid state is called:

Ans –Deposition

INVENTIONS & DISCOVERIES

1) An English chemist who discovered most of the Alkali and Alkaline earth metals of the Periodic Table: 

Ans – Sir Humphery Dary

2) Who discovered almost all the Noble gasses of the Periodic Table?

Ans – Sir William Ramsey

3) Who was the first Nobel Prize winner?

Ans – Wilhelm Roentgen

UNITS AND MEASUREMENTS

1) The speed of a supersonic aircraft is generally measured in a unit called:

Ans –Mach

2) In which unit is the Blood Pressure of a person generally measured?

Ans – mm of Mercury  Column

3) In which unit, is the Power of a lens used by an old person in his speck to read a book, generally measured?

Ans –Diopter

ASTRONOMY

1) Which is the largest asteroid?

Ans –Ceres 

2) What is the name of the largest Moon of Uranus?

Ans – Triton

3) A  Moon of Jupiter is believed to have an ocean of water below its surface, which, in the future, may give rise to life forms:

Ans –Europa

4) Which planet is often called a Liquid ball of Hydrogen?

Ans –Jupiter 

5) Who discovered the planet Uranus?

Ans – William Herschel

6) Who was the first astronomer to have discovered the four bright moons of Jupiter?

Ans –Galileo

7) The round visible surface of the Sun is known as :

Ans –Photosphere

STRUCTURE OF ATOM 

1) Who proposed special orbits known as Discrete orbits of electrons around the Nucleus of an atom?

Ans –Neils Bohr 

2) Why do some elements have fractional Atomic Mass?

  Ans – Because of the presence of Isotopes

3) The Mass of an electron is considered to be negligible and its charge is -1. If the charge is expressed in Coulomb, what is the magnitude of the charge of an electron?

Ans –1.6 x 10-19    Coulomb                                                                   

4) According to Rutherford’s α- particle experiment, the radius of the Nucleus of an atom is how many times less than the radius of the atom?

Ans – 105 times less

5) Niels Bohr introduced the concept of the discrete orbit of electrons which he called the shells  which have a fixed amount of energy. What is the other name for these shells?

Ans –Energy Levels

PRESSURE OF A FLUID 

1) Pressure exerted by a given liquid column depends on its:

Ans –Height 

2) Pressure exerted on any confined mass of a fluid is transmitted undiminished in all directions. This is according to which law?

Ans – Pascal’s Law

WORK & ENERGY

1) When the Work done by a body is negative?

Ans –When the applied  Force acts opposite to the direction of Displacement of the body. 

2) What is the Work done by the Force of gravity on a satellite moving around the Earth?

Ans – Zero

3) The electrical Energy consumed in household and commercial establishments is usually expressed in which unit?

Ans – KwH

4) The  Power of an engine is generally expressed in Horse Power unit (hp).

1 hp is equivalent to how many Watts? 

Ans – 1 hp = 735.499 Watts

NATURAL RESOURCES

1) What keeps the average temperature of the Earth constant during the day and even during the whole year?

Ans –Atmosphere

2) Which gas is poisonous at the ground level, but highly beneficial at the Stratosphere?

Ans – Ozone

3) Some gasses present in our atmosphere prevent the escape of heat from the Earth. What are these gasses called?

Ans– Green House Gases

4) Soil contains bits of decayed living organisms matter of plants and animals called :

Ans–Humus

DIVERSITY IN LIVING ORGANISMS

1) Who proposed the Five Kingdom Classification system of the living world?

Ans – Robert Whittaker

2) Cyanobacteria are included in the Monera Kingdom of the Five Kingdom Classification system. What is the other name of Cyanobacteria?

Ans – Blue- Green algae

3) Amoeba belongs to which Kingdom of the Five Kingdom Classification system?

Ans – Protista

4) Who introduced the Binomial System of Nomenclature to give unique names to plants and animals to avoid confusion?

Ans –Carolus Linnaeus 

ATOMS & MOLECULES

1) Who discovered the Law of Conservation of Mass in a chemical reaction?

Ans –Antoine Lavoisier

2) Atomic radius is generally measured in which unit?

Ans – Nanometer

3) What is the unit of the  Relative Atomic Mass of the atom of an element?

Ans – Since it is a ratio, it is a unitless quantity.

SOUND

1) In a gaseous medium like air, the speed of sound depends on its:

Ans – Temperature 

2) When a sound-producing source moves with a speed higher than the speed of Sound, it produces highly energetic waves that can shatter window panes and even buildings. What are these waves called?

Ans –Shockwaves

1. The repeated reflections of sound in the auditorium results in the persistence of sound is called: 

Ans – Reverberation

SPACE EXPLORATION 

1) Which is the first spacecraft to reach the surface of the Moon successfully?

Ans –Luna 2 

2) Who is the first astronaut to walk in space?

Ans – Russian astronaut Alexei Leonov.

3) Which spacecraft first detected the presence of water molecules on the Moon?

Ans – Chandrayaan-1

                                                                

FORCE & LAWS OF MOTION

1) What is the SI unit of Linear Momentum?

Ans –Kg. m/s

2) What produces a change in the Linear Momentum of a body?

Ans – Unbalanced Force

3) Conservation of Linear Momentum tells, in an Isolated system, the total Momentum is conserved. What do you mean by an Isolated System 

Ans – Free from any external Force

4) Although Action and Reaction pair are equal in magnitude, they don’t produce the same acceleration on the bodies on which they act. Why?

Ans – The bodies over which they act have different Masses.

ENERGY

1) What is the other name for the unit N.m?

Ans –Joule

2. Who experimentally verified the laws of conservation of energy and calculated the value of the Mechanical Equivalent of Heat?

Ans –   James Prescott Joule 

3) This is a source of fuel mostly made from organic sources that come from plants and animal matter. Common examples include Cow-dung cakes, straws, stubble etc. What are these sources collectively called: 

Ans –Biomass

4) In a biogas plant, a slurry of cow dung and water is fed to a sealed chamber called a Digester where it is broken down to methane due to the action of certain microorganisms. What kind of microorganisms carry out the process?

Ans –Anaerobic microorganisms

NATURAL RESOURCES

1) These are two types of monsoon winds in India. One is the South-West monsoon. The other type is : 

Ans –North- East Monsoon

2) Where are the Ozone holes first discovered?

Ans – Antarctica                      

                                  

IS MATTER AROUND US PURE 

1) A suspension of fine particles in a gaseous medium like air is called:

Ans – Aerosol 

2) When both the dispersed phase and dispersion medium are liquid (for example - Milk where  milk fat is dispersed in water), this is called :

Ans – Emulsion

TISSUE

1) Elastic band of tissues that connect bones to each other and provides stability and strength to the joint is called:

Ans –Ligament

2) These are fibrous tissues with great strength that connect muscle to bones  called:

Ans –Tendons

PERIODIC TABLE

1) Which element was first discovered in the Sun and then on the Earth? 

Ans –Helium; it was detected in the spectrum of the Sun in 1868 by Janssen and Lockyer and later on Earth in 1885.

2) A soft, silvery metal at standard Temperature and Pressure was not originally included in Mendeleev’s  Periodic Table. It was discovered  7 years later Mendeleev prepared the periodic table. Now it is placed in the same Group along with Aluminium, Indium, and Thallium. Can you name it?

Ans – Gallium (Atomic No- 31)