Olympiad Class 7 Science Mock Test Set 04

Question. Where is a spy satellite deployed?
(A) Low-earth orbit
(B) Geostationary orbit
(C) Polar orbit
(D) Both (A) and (B)
Answer : A

Question. Lead particles are released into the air by burning
(A) coal in thermal power stations
(B) petrol in automobiles
(C) biomass in chullahs
(D) LPG for cooking
Answer : B

Question. When the angle between two plane mirrors is 60°, how many images will be formed by the mirrors?
(A) 5
(B) 6
(C) 7
(D) 8
Answer : A

Question. Which of the following statements is NOT true ?
(A) The rotation of crops improves the fertility of soil.
(B) The rotation of crops saves a lot of nitrogenous fertilisers.
(C) The rotation of crops helps in weed and pest control.
(D) The rotation of crops helps in the maintenance of nutrients in the soil.
Answer : C

Question. Which of the following is purely a synthetic fibre?
(A) Rayon
(B) Nylon
(C) Cotton
(D) Flax
Answer : B

Question. What is the purpose of an electroscope ?
(A) To detect and test small electric charges
(B) To calculate the amount of electric charge flowing through the conductor
(C) To find out the presence of antimatter
(D) To test the presence of magnetic field
Answer : A

Question. During fractional distillation, the crude petroleum is heated to
(A) 600 ^oC.
(B) 400-500 ^oC.
(C) 200 ^oC.
(D) 100 ^oC.
Answer : B

Question. Which of the following is/are made up of cellulose ?
(A) Cell membrane
(B) Plasma membrane
(C) Cell wall
(D) All of these
Answer : C

Question. The charges present on the various objects are shown below. In which of the following cases does a force of repulsion act between them?

Answer : A

Question. Why is nylon useful?
(A) It is soft, strong and light.
(B) It is transparent, light and easy to wash.
(C) It is strong, elastic and light.
(D) It is soft, inexpensive and strong.
Answer : C

Question. Identify the three delicate bones in the middle ear.
(A) Pinna, anvil and cochlea
(B) Hammer, anvil and cochlea
(C) Pinna, eardrum and anvil
(D) Hammer, anvil and stirrup
Answer : D

Question. Which of these help in fermentation?
(A) Yeast
(B) Mould
(C) Mushroom
(D) Rhizopus
Answer : A

Question. Which of the following makes it difficult to quickly stop a ship moving in a sea by applying brakes?
(A) Low friction
(B) Excess friction
(C) High speed
(D) External force
Answer : A

Question. To which category do antimony and arsenic belong?
(A) Metals
(B) Metalloids
(C) Non-metals
(D) Minerals
Answer : B

Question. Which of the following statements about the moon is NOT correct?
(A) The moon orbits the earth keeping the same side facing us.
(B) The gravitational pull of the moon causes high tides in oceans.
(C) The craters on the moon caused long ago still exist because the moon has no atmosphere.
(D) The sun lights up the complete moon at any one time.
Answer : D

Question. Which of the following activities disturbs ecological balance by man’s interference with nature?
(A) Afforestation
(B) Recycling of paper
(C) Poaching endangered animals
(D) Rain harvesting
Answer : C

Question. Identify the fastest planet of the solar system.
(A) Mercury
(B) Uranus
(C) Jupiter
(D) Neptune
Answer : A

Question. Which of the following is used as a fuel?
(A) Gasoline
(B) Ether
(C) Tar
(D) Grease
Answer : A

Question. Where is the crust of the earth the thickest?
(A) At the continents (B) At the ocean
(C) At the poles (D) Near faults
Answer : A

Question. Which of the following structures has an internal wall lined with finger like projections?
(A) Ovary
(B) Vagina
(C) Fallopian tube
(D) Uterus
Answer : C