Olympiad Class 8 Science Mock Test Set 09

Question. To which category does Orion belong?
(A) Star
(B) Planet
(C) Galaxy
(D) Constellation
Answer : D

Question. Which of the major sources of air pollution contributes pollutants like chlorofluorohydrocarbons?
(A) Industrial effluents
(B) Aerosols
(C) Sewage pollutants
(D) All of the above
Answer : B

Question. What is the nature of image formed on the retina of human eye of an object?
(A) Virtual and erect
(B) Virtual and inverted
(C) Real and erect
(D) Real and inverted
Answer : D

Question. Which of the following practices does NOT improve the fertility of soil ?
(A) Keeping the land fallow
(B) Practising crop rotation
(C) Practising monocropping
(D) Practising multiple cropping
Answer : C

Question. By which of these processes is polythene produced?
(A) Isomerization
(B) Polymerisation
(C) Hydrogenation
(D) All of the above
Answer : B

Question. Which of the following is/are affected during lightning?
(A) T.V.
(B) Radio
(C) Telephone
(D) All of the above
Answer : D

Question. What do fuels combine with to produce heat and light?
(A) CO₂
(B) CO
(C) H₂
(D) O₂
Answer : D

Question. Which of the following organelles act as the digestive system within the cell?
(A) Golgi bodies
(B) Centrosomes
(C) Lysosomes
(D) Mitochondria
Answer : C

Question. What is the common voltage produced by a dry cell ?
(A) 1.5 V
(B) 30 V
(C) 60 V
(D) 3 V
Answer : A

Question. By what name is artificial (man-made) wool known as?
(A) Rayon
(B) Acrylic
(C) Polycot
(D) Polyester
Answer : B

Question. On what factors does the frequency of sound depend in wind instruments?
(A) The length of the air column
(B) The breadth of the air column
(C) The force with which the wind is blown
(D) All of the above
Answer : A

Question. Which of the following is the characteristic feature that distinguishes an algae from fungi?
(A) Heterotrophic
(B) Autotrophic
(C) Parasitic
(D) Sporophytic
Answer : B

Question. Which of the following is a measure of the force required to keep an object moving with the same speed?
(A) Static friction
(B) Sliding friction
(C) Limiting friction
(D) All of the above
Answer : B

Question. When a little aluminium powder is added to dilute sulphuric acid, the product(s) formed in the reaction is/are
(A) sulphur dioxide.
(B) aluminium sulphate.
(C) hydrogen.
(D) Both (B) and (C)
Answer : D

Question. A deep sea diver’s ears get hurt when he is inside the water. What is the cause for it?
(A) Lack of oxygen
(B) Decrease in atmospheric pressure
(C) Increase in water pressure
(D) All of the above
Answer : C

Question. Which of the following are living resources in nature?
(A) Flora
(B) Fauna
(C) Soil
(D) Both (A) and (B)
Answer : D

Question. Between 1979 and 1999, which of these planets was the farthest from the sun?
(A) Jupiter
(B) Neptune
(C) Uranus
(D) Mercury
Answer : B

Question. What is the source of fly ash?
(A) Petroleum
(B) Natural gas
(C) Coal
(D) All of the above
Answer : C

Question. What is the force present between two charged bodies called?
(A) Electrostatic force
(B) Electromagnetic force
(C) Gravitational force
(D) Frictional force
Answer : A

Question. In which of the following animals fertilisation is external?
(A) Birds and fish
(B) Amphibians and fish
(C) Reptiles and fish
(D) Reptiles and birds
Answer : B