Olympiad Class 8 Science Mock Test Set 03

Question. Which of the following is the brightest non-star visible to the human eye?
(A) Moon
(B) Venus
(C) Mars
(D) Jupiter
Answer : A

Question. What is the main cause of pollution of water in India?
(A) Discharge of untreated sewage
(B) Bathing
(C) Discharge of industrial waste
(D) Both (A) and (C)
Answer : D

Question. What makes objects visible?
(A) The absorption of light by objects
(B) The reflected light from the object
(C) The total internal reflection taking place in an object
(D) The refracted light from the object
Answer : B

Question. Which of the following words would complete the given sequence?

(A) Broadcasting
(B) Transplanting
(C) Manuring
(D) Drilling
Answer : C

Question. Which of the following statements is NOT true?
(A) Fabric is made of yarn.
(B) Jute is the outer covering of the coconut.
(C) Polyester is a synthetic fibre.
(D) Silk fibre is obtained from silk worms.
Answer : B

Question. What is the nature of electrical charges generated by rubbing two objects?
(A) Static
(B) Mobile
(C) Positive
(D) Negative
Answer : A

Question. What is the common name of petroleum?
(A) Black gold
(B) Yellow gold
(C) Green gold
(D) Blue gold
Answer : A

Question. Which of the following is absent in an animal cell ?
(A) Cytoplasm
(B) Nucleus
(C) Cell membrane
(D) Cell wall
Answer : D

Question. What is the splitting of a compound using electricity called?
(A) Electrolysis
(B) Electrolyte
(C) Electrokinesis
(D) Electrochemistry
Answer : A

Question. Which of the following properties of plastic makes it most convenient for use?
(A) It is non-reactive.
(B) It is light, strong and durable.
(C) It is easily remouldable.
(D) All of the above
Answer : D

Question. A person can hear an approaching train when he presses his ear to the railway track faster than one who simply stands on the tracks.
What makes this possible?
(A) The vibration of railway tracks
(B) The vibration of air
(C) The speed of sound in solids is more
(D) The hearing ability of the man
Answer : C

Question. Identify a bacteriophage.
(A) Algae
(B) Virus
(C) Protozoa
(D) Fungi
Answer : B

Question. Why is a carrom board usually powdered before playing?
(A) For increasing friction
(B) For decreasing friction
(C) For decoration
(D) For fragrance
Answer : B

Question. How many electrons are present in non-metals in their outer most shell?
(A) 1, 2 or 3
(B) 8, 9 or 10
(C) 10, 20 or 30
(D) 4, 5, 6 or 7
Answer : D

Question. A force is applied on an object in the direction of its motion. What is the effect of force on the object?
(A) The speed of the object will increase.
(B) The speed of the object will decrease.
(C) The speed of the object will remain unchanged.
(D) The object comes to rest.
Answer : A

Question. Which of the following includes all living organisms and all life-supporting regions of the Earth ?
(A) Biosphere
(B) Ionosphere
(C) Stratosphere
(D) Lithosphere
Answer : A

Question. What is Halley?
(A) A comet
(B) An asteroid
(C) A satellite of Jupiter
(D) A meteorite
Answer : A

Question. Which of the following has the lowest percentage of carbon?
(A) Lignite
(B) Bituminous
(C) Anthracite
(D) Peat
Answer : D

Question. Why is a lightning conductor installed on a building?
(A) So that it collects the electric power present in the lightning
(B) So that it repels the lightning that falls on the building
(C) So that it forces the lightning to fall in an area where thereare no buildings
(D) So that it conducts electric charge to the ground when lightning strikes the building
Answer : D

Question. Which of these organisms reproduce in the same way as yeast ?
(A) Hydra
(B) Amoeba
(C) Starfish
(D) Flatworm
Answer : A