Chapter-14 Natural Resources, Science 9th Class (Ncert Exampler)

 1. The atmosphere of the earth is heated by radiations which are mainly 

(a) radiated by the sun 

b) re-radiated by land 

(c) re-radiated by water 

(d) re-radiated by land and water 

2. If there were no atmosphere around the earth, the temperature of the earth will 

(a) increase 

(b) go on decreasing 

(c) increase during day and decrease during night 

(d) be unaffected 

3. What would happen, if all the oxygen present in the environment is converted to ozone? 

(a) We will be protected more 

(b) It will become poisonous and kill living forms 

(c) Ozone is not stable, hence it will be toxic 

(d) It will help harmful sun radiations to reach earth and damage many life forms. 

4. One of the following factors does not lead to soil formation in nature 

(a) the sun 

(b) water 

(c) wind 

(d) polythene bags 

5. The two forms of oxygen found in the atmosphere are 

(a) water and ozone 

(b) water and oxygen 

(c) ozone and oxygen 

(d) water and carbon-dioxide 

6. The process of nitrogen-fixation by bacteria does not take place in the presence of 

(a) molecular form of hydrogen 

(b) elemental form ooxygen 

(c) water 

(d) elemental form of nitrogen 

7. Rainfall patterns depend on 

(a) the underground water table 

(b) the number of water bodies in an area 

(c) the density pattern of human population in an area 

(d) the prevailing season in an area 

8. Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides? 

(a) They are eco-friendly 

(b) They turn the fields barren after some time 

(c) They adversally affect the useful component from the soil 

(d) They destroy the soil fertility 

9. The nitrogen molecules present in air can be converted into nitrates and nitrites by 

(a) a biological process of nitrogen fixing bacteria present in soil 

(b) a biological process of carbon fixing factor present in soil 

(c) any of the industries manufacturing nitrogenous compounds 

(d) the plants used as cereal crops in field 

10. One of the following processes is not a step involved in the water-cycle operating in nature 

(a) evaporation 

(b) transpiration 

(c) precipitation 

(d) photosynthesis 

11. The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition? 

(a) The addition of undesirable substances to water-bodies 

(b) The removal of desirable substances from water-bodies 

(c) A change in pressure of the water bodies 

(d) A change in temperature of the water bodies 

12. Which of the following is not a green house gas? 

(a) Methane 

(b) Carbon dioxide 

(c) Carbon monoxide 

(d) Ammonia 

13. Which step is not involved in the carbon-cycle? 

(a) Photosynthesis 

(b) Transpiration 

(c) Respiration 

(d) Burning of fossil fuels 

14. ‘Ozone-hole’ means 

(a) a large sized hole in the ozone layer 

(b) thinning of the ozone layer 

(c) small holes scattered in the ozone layer 

(d) thickening of ozone in the ozone layer 

15. Ozone-layer is getting depleted because of 

(a) excessive use of automobiles 

(b) excessive formation of industrial units 

(c) excessive use of man-made compounds containing both fluorine and chlorine 

(d) excessive deforestation. 

16. Which of the following is a recently originated problem of environment? 

(a) Ozone layer depletion 

(b) Green house effect 

(c) Global warming 

(d) All of the above 

17. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen? 

(a) It moves along with oxygen into the cells 

(b) It comes out with the CO2 during exhalation 

(c) It is absorbed only by the nasal cells 

(d) Nitrogen concentration is already more in the cells so it is not at all absorbed. 

18. Top-soil contains the following 

(a) Humus and living organisms only 

(b) Humus and soil particles only 

(c) Humus, living organisms and plants 

(d) Humus, living organisms and soil particles. 

19. Choose the correct sequences 

(a) CO2 in atmosphere → decomposers → organic carbon in animals → organic carbon in plants 

(b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil 

(c) Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers 

(d) Organic carbon in animals → decomposers → CO2 in atmosphere → organic carbon in plants

20. Major source of mineral in soil is the 

(a) parent rock from which soil is formed 

(b) plants 

(c) animals 

(d) bacteria 

21. Total earth’s surface covered by water is 

(a) 75% 

(b) 60% 

(c) 85% 

(d) 50% 

22. Biotic component of biosphere is not constituted by 

(a) producers 

(b) consumers 

(c) decomposer 

(d) air 

23. An increase in carbondioxide content in the atmosphere would not cause 

(a) more heat to be retained by the environment 

(b) increase in photosynthesis in plants 

(c) global warming 

(d) abundance of desert plants 

24. Oxygen is returned to the atmosphere mainly by 

(a) burning of fossil fuel 

(b) respiration 

(c) photosynthesis 

(d) fungi 

25. Low visibility during cold weather is due to 

(a) formation of fossil fuel 

(b) unburnt carbon particles or hydrocarbons suspended in air 

(c) lack of adequate power supply 

(d) none of these 

26. Growth of Lichens on barren rocks is followed by the growth of 

(a) moss 

(b) ferns 

(c) gymnosperms 

(d) algae 

27. Marked temperature changes in aquatic environment can affect 

(a) breeding of animals 

(b) more growth of aquatic plants 

(c) process of digestion in animals 

(d) availability of nutrients. 

28. Soil erosion can be prevented by 

(a) raising forests 

(b) deforestation 

(c) excessive use of fertilizer 

(d) overgrazing by animals 

29. What happens when rain falls on soil without vegetational cover? 

(a) Rain water percolates in soil efficiently 

(b) Rain water causes loss of surface soil 

(c) Rain water leads to fertility of the soil 

(d) Rain water does not cause any change in soil 

30. Oxygen is harmful for 

(a) ferns 

(b) nitrogen fixing bacteria 

(c) chara 

(d) mango tree Short Answer 

Chapter-13 Why Do We Fall ill ,Class 9th Science

 1. Which one of the following is not a viral disease? 

(a) Dengue 

(b) AIDS 

(c) Typhoid 

(d) Influenza 

2. Which one of the following is not a bacterial disease? 

(a) Cholera 

(b) Tuberculosis 

(c) Anthrax 

(d) Influenza 

3. Which one of the following disease is not transmitted by mosquito? 

(a) Brain fever 

(b) Malaria 

(c) Typhoid 

(d) Dengue 

4. Which one of the following disease is caused by bacteria? 

(a) Typhoid 

(b) Anthrax 

(c) Tuberculosis 

d) Malaria 

5. Which one of the following diseases is caused by protozoans? 

(a) Malaria 

(b) Influenza 

(c) AIDS 

(d) Cholera 

6. Which one of the following has a long term effect on the health of an individual? 

(a) Common cold 

(b) Chicken pox 

(c) Chewing tobacco 

(d) Stress

7. Which of the following can make you ill if you come in contact with an infected person? 

(a) High blood pressure 

(b) Genetic abnormalities 

(c) Sneezing 

(d) Blood cancer 

8. AIDS cannot be transmitted by 

(a) sexual contact 

(b) hugs 

(c) breast feeding 

(d) blood transfusion 

9. Making anti-viral drugs is more difficult than making anti-bacterial medicines because 

(a) viruses make use of host machinery 

(b) viruses are on the border line of living and non-living 

(c) viruses have very few biochemical mechanisms of their own 

(d) viruses have a protein coat 

10. Which one of the following causes kala-azar? 

(a) Ascaris 

(b) Trypanosoma 

(c) Leishmania 

(d) Bacteria 

11. If you live in a overcrowded and poorly ventilated house, it is possible that you may suffer from which of the following diseases 

(a) Cancer 

(b) AIDS 

(c) Air borne diseases

(d) Cholera 

12. Which disease is not transmitted by mosquitoes? 

(a) Dengue 

(b) Malaria 

(c) Brain fever or encephalitis 

(d) Pneumonia 

13. Which one of the following is not important for individual health? 

(a) Living in clean space 

(b) Good economic condition 

(c) Social equality and harmony 

(d) Living in a large and well furnished house

14. Choose the wrong statement 

(a) High blood pressure is caused by excessive weight and lack of exercise. 

(b) Cancers can be caused by genetic abnormalities 

(c) Peptic ulcers are caused by eating acidic food 

(d) Acne in not caused by staphylococci 

15. We should not allow mosquitoes to breed in our surroundings because they 

(a) multiply very fast and cause pollution 

(b) are vectors for many diseases

 (c) bite and cause skin diseases 

(d) are not important insects 

16. You are aware of Polio Eradication Programme in your city. Children are vaccinated because 

(a) vaccination kills the polio causing microorganisms 

(b) prevents the entry of polio causing organism 

(c) it creates immunity in the body 

(d) all the above 

17. Viruses, which cause hepatitis, are transmitted through 

(a) air 

(b) water 

(c) food 

(d) personal contact 

18. Vectors can be defined as 

(a) animals carry the infecting agents from sick person to another healthy person 

(b) microorganisms which cause many diseases

(c) infected person 

(d) diseased plants

Chapter-Sound, Chapter 12, Class 9th (NCERT EXAMPLER)

 1. Note is a sound 

(a) of mixture of several frequencies 

(b) of mixture of two frequencies only 

(c) of a single frequency 

(d) always unpleasant to listen 

2. A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case 

(a) sound will be louder but pitch will not be different.

 (b) sound will be louder and pitch will also be higher 

(c) sound will be louder but pitch will be lower 

(d) both loudness and pitch will remain unaffected 

3. In SONAR, we use 

(a) ultrasonic waves

(b) infrasonic waves 

(c) radio waves 

(d) audible sound waves

4. Sound travels in air if 

(a) particles of medium travel from one place to another 

(b) there is no moisture in the atmosphere 

(c) disturbance moves 

(d) both particles as well as disturbance travel from one place to another. 

5. When we change feeble sound to loud sound we increase its 

(a) frequency 

(b) amplitude

(c) velocity 

(d) wavelength 

6. In the curve (Fig.12.1) half the wavelength is 

(a) A B 

(b) B D 

(c) D E 

(d) A E

7. Earthquake produces which kind of sound before the main shock wave begins 

(a) ultrasound 

(b) infrasound 

(c) audible sound 

(d) none of the above 

8. Infrasound can be heard by 

(a) dog 

(b) bat 

(c) rhinoceros 

(d) human beings 

9. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting 

(a) intensity of sound only 

(b) amplitude of sound only 

(c) frequency of the sitar string with the frequency of other musical instruments 

(d) loudness of sound

Chapter-11 Work and Energy (NCERT Exampler MCQ),Class 9th

 1. When a body falls freely towards the earth, then its total energy 

(a) increases 

(b) decreases 

(c) remains constant 

(d) first increases and then decreases 

2. A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car 

(a) does not change 

(b) becomes twice to that of initial 

(c) becomes 4 times that of initial 

(d) becomes 16 times that of initial 

3. In case of negative work the angle between the force and displacement is 

(a) 0degree

(b) 45degree

(c) 90degree

(d ) 180degree

4. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same 

(a) acceleration 

(b) momenta 

(c) potential energy 

(d) kinetic energy 

5. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s–2) 

(a) 6 ×10cube 

(b) 6 J

(c) 0.6 J 

(d) zero 

6. Which one of the following is not the unit of energy? 

(a) joule 

(b) newton metre 

(c) kilowatt 

(d) kilowatt hour

7. The work done on an object does not depend upon the 

(a) displacement 

(b) force applied 

(c) angle between force and displacement 

(d) initial velocity of the object 

8. Water stored in a dam possesses 

(a) no energy 

(b) electrical energy 

(c) kinetic energy 

(d) potential energy 

9. A body is falling from a height h. After it has fallen a height h/2 , it will possess 

(a) only potential energy 

(b) only kinetic energy 

(c) half potential and half kinetic energy 

(d) more kinetic and less potential energy

Chapter-10 Gravitation, Class 9th Science Ncert Exampler

1. Two objects of different masses falling freely near the surface of moon would 

(a) have same velocities at any instant 

(b) have different accelerations 

(c) experience forces of same magnitude

(d) undergo a change in their inertia

 2. The value of acceleration due to gravity 

(a) is same on equator and poles 

(b) is least on poles 

(c) is least on equator 

(d) increases from pole to equator

 3. The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them, then the gravitational force would become 

(a) F/4

(b) F/2

(c) F 

(d) 2 F 

4. A boy is whirling a stone tied with a string in an horizontal circular path. If the string breaks, the stone 

(a) will continue to move in the circular path 

(b) will move along a straight line towards the centre of the circular path 

(c) will move along a straight line tangential to the circular path 

(d) will move along a straight line perpendicular to the circular path away from the boy 

5. An object is put one by one in three liquids having different densities. The object floats with 1/9,2/11  and 3/7 parts of their volumes outside the liquid surface in liquids of densities d1, d2 and d3 respectively. Which of the following statement is correct?

 (a) d1> d2> d3 

(b) d1> d2< d3 

(c) d1< d2> d3 

(d) d1< d2< d3

6. In the relation F = G M m/d2, the quantity G 

(a) depends on the value of g at the place of observation

(b) is used only when the earth is one of the two masses 

(c) is greatest at the surface of the earth 

(d) is universal constant of nature 

7. Law of gravitation gives the gravitational force between 

(a) the earth and a point mass only 

(b) the earth and Sun only 

(c) any two bodies having some mass 

(d) two charged bodies only 

8. The value of quantity G in the law of gravitation 

(a) depends on mass of earth only 

(b) depends on radius of earth only 

(c) depends on both mass and radius of earth 

(d) is independent of mass and radius of the earth 

9. Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be 

(a) 1/4 times 

(b) 4 times 

(c) 1/2 times

(d) unchanged 

10. The atmosphere is held to the earth by 

(a) gravity 

(b) wind 

(c) clouds 

(d) earth’s magnetic field 

11. The force of attraction between two unit point masses separated by a unit distance is called 

(a) gravitational potential 

(b) acceleration due to gravity

(c) gravitational field

(d) universal gravitational constant 

12. The weight of an object at the centre of the earth of radius R is 

(a) zero 

(b) infinite 

(c) R times the weight at the surface of the earth 

(d) 1/R square times the weight at surface of the earth

13. An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be 

(a) 2 N 

(b) 8 N 

(c) 10 N 

(d) 12 N 

14. A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be 

(a) maximum when length and breadth form the base 

(b) maximum when breadth and width form the base 

(c) maximum when width and length form the base 

(d) the same in all the above three cases 

15. An apple falls from a tree because of gravitational attraction between the earth and apple. If F1 is the magnitude of force exerted by the earth on the apple and F2 is the magnitude of force exerted by apple on earth, then 

(a) F1 is very much greater than F2 

(b) F2 is very much greater than F1 

(c) F1 is only a little greater than F2 

(d) F1 and F2 are equal

Class 9th Chapter Force and laws of Motion (exampler question)

 1. Which of the following statement is not correct for an object moving along a straight path in an accelerated motion? 

(a) Its speed keeps changing

(b) Its velocity always changes

(c) It always goes away from the earth  

(d) A force is always acting on it

 2. According to the third law of motion, action and reaction 

(a) always act on the same body 

b) always act on different bodies in opposite directions 

(c) have same magnitude and directions 

(d) act on either body at normal to each other 

3. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to 

 (a) exert larger force on the ball 

(b) reduce the force exerted by the ball on hands 

 (c) increase the rate of change of momentum 

(d) decrease the rate of change of momentum 

4. The inertia of an object tends to cause the object 

 (a) to increase its speed 

 (b) to decrease its speed 

 (c) to resist any change in its state of motion 

 (d) to decelerate due to friction 

5. A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

 (a) accelerated 

(b) uniform 

(c) retarded 

(d) along circular track

6. An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is 

(a) 32 N 

(b) 0 N 

(c) 2 N 

(d) 8 N 

7. Rocket works on the principle of conservation of

 (a) mass

 (b) energy 

(c) momentum 

(d) velocity

 8. A water tanker filled up to 2/3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

 (a) move backward

(b) move forward

 (c) be unaffected

 (d) rise upwards