Olympiad Class 8 Science Mock Test Set F

Question. Why Rahul could not see a burning candle by using a bent pipe?
(A) Because light gets reflected.
(B) Because light gets absorbed.
(C) Because light travels in straight lines.
(D) Because light gets bent along the pipe.
Answer : C

Question. Which of the following is a natural fibre that comes from plants?
(A) Silk
(B) Cotton
(C) Rayon
(D) Polyester
Answer : B

Question. Which of the following liquid is a bad conductor of electricity?
(A) Lemon juice
(B) Vinegar
(C) Sea water
(D) Distilled water
Answer : D

Question. Given below are the symptoms of a disease. 
Identify the disease.
i. Fever and itchy rash
ii. Pimples blisters and scabs
iii. Scabs drop after about two weeks
(A) Tuberculosis
(B) Typhoid
(C) Chickenpox
(D) Cholera
Answer : C

Question. Which of the following is NOT an effect of frictional force?
(A) Flattening of grooves of tyre due to use
(B) A rolling ball coming to a halt
(C) Leaves falling from tree on to ground
(D) Holding a pencil in your hand
Answer : C

Question. Identify the forms of fuels.
(A) Solids
(B) Liquids
(C) Gases
(D) All of these
Answer : D

Question. If you are inside a building when an earthquake occurs, it is best to
(A) leave the building at once
(B) lie down in the middle of a room
(C) switch the lights off
(D) all of the above
Answer : A

Question. Which of the following changes is NOT observed in a boy at puberty?
(A) He grows in height and weight
(B) He starts to produce sperms
(C) Pubic hair starts to grow
(D) Voice becomes feminine
Answer : D

Question. The term that describes how the brain interprets the frequency of a sound, is called
(A) loudness
(B) frequency
(C) pitch
(D) auditory
Answer : C

Question. Identify the four main varieties of coal from superior to inferior.
(A) peat, bituminous, lignite, anthracite
(B) bituminous, peat, lignite, anthracite
(C) anthracite, bituminous, lignite, peat
(D) lignite, anthracite, bituminous, peat
Answer : C

Question. Which type of tissue supports, defends and stores food in animals?
(A) Epithelial
(B) Connective
(C) Nervous
(D) Muscular
Answer : B

Question. Which effect of force is caused by the magnetic force between a magnet and a magnetic substance?
(A) Change of position.
(B) Change of shape.
(C) Change of physical state.
(D) Change of chemical nature.
Answer : A

Question. Which of the following methods of cultivation will result in the loss of soil fertility ?
I. Crop rotation
II. Shifting cultivation
III. Excessive use of chemical fertilisers
(A) I and II only
(B) I and III only
(C) II and III only
(D) I, II and III
Answer : C

Question. The diagram shows the path of a light ray X directed at a plane mirror.

The correct reflected ray is:
(A) P
(B) N
(C) O
(D) M
Answer : B

Question. Which properties of a metal frame are chosen in selecting a spectacle?
(A) Strong, durable
(B) Lustrous, malleable
(C) Malleable, ductile
(D) Flexible, ductile
Answer : A

Question. In which of the following organisms is the cell wall made up of silica ?
(A) Rhizopus
(B) Mucor
(C) Agaricus
(D) Diatoms
Answer : D

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. The gas liberated when H₂SO₄ reacts with lime stone is
(A) CO₂
(B) CaSO₄
(C) SO₂
(D) H₂
Answer : A

Question. What are the weak zones that are prone to slide and cause earthquake commonly known as?
(A) Fault zone
(B) Eruption zone
(C) Explosive zone
(D) Sliding zone
Answer : A

Question. Which one of the following activities will produce least amount of frictional force?
(A) Walking
(B) Running
(C) Ice-skating
(D) Rowing a boat
Answer : C