Olympiad Class 8 Science Mock Test Set 05

Question. What is a cosmic year?
(A) The time taken by the earth to revolve around the sun
(B) The time taken by the sun to revolve around itself
(C) The time taken by the earth to revolve around itself
(D) The time taken by the sun to revolve around the centre of the galaxy, the Milky Way.
Answer : D

Question. Which of the following pollutants is NOT present in the vehicular exhaust emissions?
(A) Lead
(B) Ammonia
(C) Carbon monoxide
(D) Particulate matter
Answer : B

Question. Look at the given figure.

Find the angle between the incident ray and the reflected ray.
(A) 60°
(B) 90°
(C) 80°
(D) 40°
Answer : C

Question. The substances that are transported through umbilical cord
(A) urea.
(B) antibodies.
(C) carbon dioxide
(D) all of these
Answer : D

Question. Which of the following are the uses of machinery in agriculture ?
(A) Increase the quantity of crop yield.
(B) Get the job done faster.
(C) Reduce the dependency on human and animal labour.
(D) Both (B) and (C)
Answer : D

Question. Which of the following is non-biodegradable?
(A) Plastic
(B) Cotton
(C) Paper
(D) Left-over food
Answer : A

Question. Which of the following allows the transfer of electric charge from one charged object to another?
(A) Vacuum
(B) Air
(C) Insulator
(D) Conductor
Answer : D

Question. What does gobar gas produced from animal and plant waste contain?
(A) Ethane
(B) Methane
(C) Propane
(D) Acetylene
Answer : B

Question. Which of the following is the intracellular transport structure that helps in the protein and lipid synthesis ?
(A) Ribosomes
(B) Microtubules and microfilaments
(C) Golgi complex
(D) Endoplasmic reticulum
Answer : D

Question. ‘X’ is a good conductor of electricity. Which of the following could be ‘X’?
(A) Solid sodium chloride
(B) Vinegar
(C) Distilled water
(D) Liquid oxygen
Answer : B

Question. What do silk fibres consist of?
(A) Vitamins
(B) Carbohydrates
(C) Proteins
(D) Fats
Answer : C

Question. Which of the following frequencies cannot be heard by human beings?
(A) 1000 Hz
(B) 10,000 Hz
(C) 100 Hz
(D) 1,00,000 Hz
Answer : D

Question. Which of the following fungi have given one of the greatest drugs to the world of medicine ?
(A) Penicillium notatum
(B) Ustilago maydis
(C) Colletorichum falcatum
(D) Alternaria solani
Answer : A

Question. What will happen to a moving object if there is no friction?
(A) The object will stop.
(B) The object will keep on moving.
(C) The object will change speed.
(D) The object will change direction.
Answer : B

Question. Which non-metal exhibits yellow colour?
(A) Silicon
(B) Phosphorus
(C) Sulphur
(D) Carbon
Answer : C

Question. Which of the following is true of the man in the picture shown below?

(A) He is applying force on the stool.
(B) He represents only magnitude but no direction.
(C) He is not applying any force on the stool.
(D) The gravitational pull of earth on the stool is greater.
Answer : A

Question. What prevents soil erosion?
(A) Allowing herbivorous animals to graze excessively
(B) Growing plants to form the soil cover
(C) Increasing fertility
(D) Making the land sloppy
Answer : B

Question. What is the approximate height of a geo stationary satellite?
(A) 6,400 km
(B) 12,800 km
(C) 7,200 km
(D) 36,000 km
Answer : D

Question. What are the characteristics of a rocket fuel?
(A) Light and compact
(B) High calorific value
(C) Burns rapidly
(D) All of the above
Answer : D

Question. What are the weak zones that are present around the boundaries of plates underneath the earth and cause slides and earthquakes commonly known as?
(A) Fault zones
(B) Eruption zones
(C) Explosive zones
(D) Sliding zones
Answer : A