Olympiad Class 7 Science Mock Test Set B

Question. Identify the biggest constellation.
(A) Sirius
(B) Hydra
(C) Andromeda
(D) Ursa minor
Answer : B

Question. Which water pollutant is INCORRECTLY paired with the source?
(A) Oil spill – ship
(B) Pesticide – oil palm plantation
(C) Sewage – factories
(D) Nitrate – farm
Answer : C

Question. Which of the following statements is true?
(A) The angle of incidence is twice the angle of reflection.
(B) The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane.
(C) Some virtual images can be caught on the screen.
(D) A convex mirror forms a real image.
Answer : B

Question. Which of the following crops would enrich the soil with nitrogen ?
(A) Apple
(B) Pea
(C) Paddy
(D) Potato
Answer : B

Question. Plastic is coated with melamine to make it
(A) a good conductor of heat.
(B) strong and flexible.
(C) fire proof plastic.
(D) remouldable.
Answer : C

Question. How is lightning useful to us?
(A) It helps in nitrogen fixation and promotes plant growth.
(B) Ozone is formed which prevents ultraviolet rays falling on the earth.
(C) It helps in the evolution of a new species.
(D) All of the above
Answer : D

Question. Which substance has the highest boiling point?
(A) Kerosene
(B) Petrol
(C) Diesel
(D) Water
Answer : D

Question. Which of the following is/are the green plastids ?
(A) Carotenoids
(B) Xanthophyll
(C) Chloroplasts
(D) All the above
Answer : C

Question. Why are LED’s extensively used to replace bulbs?
(i) Consume less electricity
(ii) Have longer life
(iii) Have more power
(A) Only (i) and (ii)
(B) Only (ii) and (iii)
(C) Only (i) and (iii)
(D) (i), (ii) and (iii)
Answer : D

Question. Which of the following is NOT a natural polymer?
(A) Natural rubber
(B) Polyester
(C) Protein
(D) Starch
Answer : B

Question. On what factors does the loudness or intensity of sound depend?
(A) The amplitude of a sound wave
(B) The area of a vibrating body
(C) Distance from the source of sound
(D) All of the above
Answer : A

Question. How are microorganisms useful to us?
(A) The production of chemical fertilizers
(B) The production of fireworks
(C) The production of soft drinks
(D) The production of antibiotics
Answer : D

Question. Which of the following is a disadvantage of friction?
(A) It enables the brakes of a car to work.
(B) It allows us to hold a pen.
(C) It helps us to sandpaper a table.
(D) It wears out our shoes.
Answer : D

Question. Metal ‘X’ reacts very slowly with water but reacts vigorously with steam. Identify metal ‘X’.
(A) Magnesium
(B) Silver
(C) Copper
(D) Potassium
Answer : A

Question. On what factors does the magnitude of non-contact force depend?
(A) Distance between two bodies
(B) Mass of the two bodies
(C) Chemical composition of the two bodies
(D) All of the above
Answer : D

Question. What is a National Park?
(A) An area strictly reserved for improvement of wild life
(B) An area where grazing and cultivation are permitted
(C) A park where the whole nation can have picnics
(D) A park which can be privately owned
Answer : A

Question. Why does the pole star appear to be stationary in all seasons?
(A) It does not rotate on its axis.
(B) It happens to lie on the axis of equator.
(C) It happens to lie above the axis of north pole of the earth.
(D) It is the most distant of all the stars.
Answer : C

Question. Identify the fuel that leaves more smoke and ash on burning.
(A) Solid fuels
(B) Liquid fuels
(C) Gaseous fuels
(D) Any one of the above
Answer : A

Question. Which of the following is the safest way to protect yourself from lightning?
(A) Run into an open field
(B) Open an umbrella for cover
(C) Take shelter under a tree
(D) Squat low on the ground
Answer : D

Question. Which of the following shows the correct route, that the sperm takes after leaving the testis ?
(A) Epididymis - vas deferens - ejaculatory duct - urethra.
(B) Vas deferens - epididymis - urethra - ejaculatory duct.
(C) Ejaculatory duct - epididymis - vas deferens - urethra.
(D) Epididymis - vas deferens - urethra - ejaculatory duct.
Answer : B