Olympiad Class 9 Science Mock Test Set 05

Question. What is the closely packed part of the comet which contains solid particles, stones and frozen water called ?
(A) Coma
(B) Nucleus
(C) Tail
(D) Orbit
Answer : B

Question. If there is no CO₂ in the atmosphere, what would happen to the earth’s temperature?
(A) It would be less than the present.
(B) It would be the same as present.
(C) It would be higher than the present.
(D) It depends on the O₂ content of air.
Answer : A

Question. Identify the value of persistence of vision.
(A) 1/10th of a second
(B) 1/12th of a second
(C) 1/16th of a second
(D) 1/20th of a second
Answer : C

Question. In which of the following agricultural methods does the farmer sows beans in his fields after harvesting a crop of wheat?
(A) Crop rotation
(B) Multiple cropping
(C) Fallow field
(D) Mixed cropping
Answer : A

Question. What is the process of taking out silk threads from the cocoon known as?
(A) Rearing
(B) Sorting
(C) Scouring
(D) Reeling
Answer : D

Question. What are lightning rods made up of?
(A) Copper
(B) Plastic
(C) Bakelite
(D) Sand paper
Answer : A

Question. In LPG cylinder, how is the gas liquified?
(A) By increasing volume
(B) By applying high pressure
(C) By increasing temperature
(D) By reducing pressure
Answer : B

Question. Which of the following is true of the colourless plastid and its function?
(A) Chloroplasts performs photosynthesis
(B) Leucoplasts performs respiration
(C) Chromoplasts are involved with protection from sunlight
(D) Leucoplasts help in the storage of food
Answer : D

Question. Which circuit gives the correct way of connecting an LED to light it up?

Answer : B

Question. Which material is used to prepare synthetic fibres like polyester and acrylic?
(A) Wood pulp
(B) Coconut fibres
(C) Petrochemicals
(D) Paper pulp
Answer : C

Question. How can the brain interpret the frequency of a sound?
(A) By the loudness of sound
(B) By the frequency of sound
(C) By the pitch of sound
(D) By the amplitude of sound
Answer : C

Question. Which of the following statements is true for viruses?
(A) Viruses multiply only in living host.
(B) Their crystals have a definite shape.
(C) Viruses grow and multiply by themselves outside the host.
(D) Viruses may be crystallized.
Answer : A

Question. Why are tyres made circular in shape?
(A) It is easy to inflate circular tyres.
(B) Rolling friction is less than sliding friction.
(C) Circular tyres dissipate less heat.
(D) Circular tyres easily slow down or stop a vehicle.
Answer : B

Question. Which of the following substances will prevent corrosion of metals?
(A) Nitrogen
(B) Hydrogen
(C) Oxygen
(D) Carbon
Answer : A

Question. Which of the following is NOT a force?
(A) Muscular
(B) Magnetic
(C) Chemical
(D) Electric
Answer : C

Question. Which of the following is the consequence of man’s interference with nature?
(A) Increase in natural resources
(B) Biological imbalance
(C) Increase in the ozone layer
(D) All of these
Answer : B

Question. Which of the following is equal to one cosmic year?
(A) 365 days
(B) 24 days
(C) 2.25 x 10⁶ days
(D) 225 x 10⁶ years
Answer : D

Question. When an oil well is drilled through rocks, which of the following comes out first?
(A) Coal gas
(B) Marsh gas
(C) Natural gas
(D) Carbon dioxide
Answer : C

Question. Suppose you are in a car and there is a thunderstorm. What is the best way to protect yourself from possible harm?
(A) Remaining in the car
(B) Getting out of the car and taking cover under the car
(C) Running to a nearby tree
(D) Getting out and standing under an electric pole
Answer : A

Question. Which of the following processes refers to the casting away of the skin by a caterpillar to allow a larger caterpillar to emerge ?
(A) Metamorphosis
(B) Chrysalis
(C) Moulting
(D) Development
Answer : C