Olympiad Class 8 Science Mock Test Set B

Question. A figure of a periscope is shown below. Which labelled parts should be adjusted to view an object placed higher?

(A) P
(B) Q
(C) R
(D) All of these
Answer : A

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

Question. Siddu passed electricity through two samples one containing distilled water while other containing mineral water. He found that galvanometer deflected only in case of sample containing mineral water. What conclusions did he draw from the experiment?
(A) Mineral water is safe for drinking.
(B) Mineral water is a good conductor of electricity.
(C) Mineral water contains acids.
(D) Mineral water can be used in boilers.
Answer : B

Question. Which of the following is a communicable disease?
(A) Cancer
(B) Malaria
(C) Heart attack
(D) Diabetes
Answer : B

Question. Why are vehicle tyres treaded?
(A) To increase friction.
(B) To decrease friction.
(C) To multiply friction.
(D) To decrease grip.
Answer : A

Question. Fuels burn to produce heat, light and
(A) CO₂ + water vapour
(B) CO + O₂
(C) CO₂ + H₂
(D) CO + H₂
Answer : A

Question. The point of initial rock movement along a fault during an earth quake is called the
(A) epicenter
(B) focus
(C) strike
(D) fault zone
Answer : B

Question. Which of the following pairs of microorganism and disease is wrongly matched?
(A) Virus – Tobacco mosaic disease
(B) Protozoa – Sleeping sickness
(C) Fungus – Athlete’s foot
(D) Bacteria – Rust of wheat
Answer : D

Question. A person, pressing his ear on the railway track can hear an approaching train. This is due to
(A) vibration of railway track
(B) vibration of air
(C) more speed of sound in solid medium
(D) hearing ability of the man
Answer : C

Question. Which of the following is a fossil fuel?
(A) Petroleum
(B) Wood
(C) Cow dung
(D) Twigs
Answer : A

Question. Which of the following properties of nylon make it most convenient to use?
(A) It is soft, strong and heavy
(B) It is strong, elastic and light
(C) It is hard, inexpensive and strong
(D) none of the above
Answer : B

Question. A boy feels difficult to pull the two similar rubber suckers apart as shown below. This is because

(A) the air pressure is pressing on the suckers with a great force.
(B) the air pressure is pressing on the suckers with a negligible force.
(C) the air trapped inside the suckers is exerting a large pressure.
(D) there is no air inside the suckers.
Answer : A

Question. How is the sex of the baby determined?
(A) Sex chromosomes of mother
(B) Sex chromosomes of father
(C) ‘X’ chromosome of unfertilised egg
(D) All 23 pairs of chromosomes
Answer : B

Question. Which surface among the following will reflect most of the light falling on them?
(A) Flat surface
(B) Shiny surface
(C) Smooth surface
(D) Transparent surface
Answer : B

Question. Why are iron objects often electroplated with nickel or chromium?
(A) To make them more expensive.
(B) To make the object shiny.
(C) To make the object heavier and denser.
(D) To prevent them from rusting.
Answer : D

Question. In which of the following processes is chaff removed from grains ?
(A) Weeding
(B) Threshing
(C) Harvesting
(D) Winnowing
Answer : D

Question. In which of the following cases does frictional force exist?
(A) For moving bodies.
(B) For bodies which are at rest.
(C) For both moving and non-moving bodies.
(D) Only for non-living objects.
Answer : C

Question. What are the products formed when a mixture of powdered iron and copper (II) oxide are heated strongly in a crucible?
(A) Iron (II) oxide and copper are formed
(B) Copper (III) oxide and iron (II) oxide are formed
(C) Iron (III) oxide and copper sulphate are formed
(D) No reaction are formed
Answer : A

Question. Match the following.
1. Charge                      P. Seismic zone
2. Lightning                  Q. Electroscope
3. Earthquake               R. Richter scale
4. Seismograph            S. Thunder storm
(A) 1 - Q, 2 - S, 3 - P, 4 - R
(B) 1 - S, 2 - Q, 3 - R, 4 - P
(C) 1 - R, 2 - P, 3 - S, 4 - Q
(D) 1 - S, 2 - R, 3 - P, 4 - Q
Answer : A

Question. Energy flow in an ecosystem is in which of the following forms ?
(A) Multidirectional
(B) Unidirectional
(C) Bidirectional
(D) Circular
Answer : B