Olympiad Class 8 Science Mock Test Set H

Question. An incident ray strikes a mirror at 250. What is the angle between the incident ray and the reflected ray ?
(A) 65°
(B) 50°
(C) 130°
(D) 25°
Answer : C

Question. Which of the following properties of synthetic plastic makes it the most convenient to use?
(A) Good electrical conductor
(B) Malleable
(C) Light, strong and remouldable
(D) Reactive
Answer : C

Question. A can used for storing soft drinks, food items is usually electroplated with tin because
(A) tin is less reactive than the base metal
(B) tin is cheap
(C) tin is stronger and shiny in appearance
(D) tin is lighter than other metals
Answer : A

Question. Which of the following organelles of a cell is responsible for mechanical support and enzyme transport?

Answer : B

Question. On a rough surface, when does a body have zero force of friction ?
(A) When no force is applied on it.
(B) When large force is applied on it.
(C) When the body is rolling on the surface.
(D) When the body is sliding on the surface.
Answer : A

Question. Why is a flame always pointed upwards?
I. Gases produced in flame are cold
II. Gases produced in flame are hot
III. Hot gases are lighter and rise up
(A) I and II only
(B) II and III only
(C) III and I only
(D) I, II and III
Answer : B

Question. What are the fragmented outermost layers of earth known as?
(A) Plates
(B) Crust
(C) Core
(D) Zones
Answer : A

Question. The diagram given below shows a human cell.

This cell is produced in the
(A) ovary
(B) sperm ducts
(C) oviducts
(D) testes
Answer : D

Question. Which of the following is a wind instrument?
(A) Flute
(B) Guitar
(C) Violin
(D) Jaltarang
Answer : A

Question. Identify the constituent of petroleum that is NOT used in electric generators as a fuel.
(A) Kerosene
(B) Petrol
(C) Diesel
(D) Lubricating oil
Answer : D

Question. The blood pressure in humans is greater at the feet than at the brain because
(A) of gravitational force
(B) weight of the man is concentrated at the feet
(C) of height of blood column
(D) concentration of blood is more at the feet
Answer : C

Question. Which of the following changes occur in females at puberty?
(A) Ovulation
(B) Deepening of voice
(C) Broadening of pelvis
(D) Both (A) and (C)
Answer : D

Question. A pin-hole camera works on the principle of
(A) rectilinear propagation of light
(B) refraction of light
(C) interference of light
(D) highest speed of light
Answer : A

Question. What kind of clothes do we prefer while cooking in the kitchen?
(A) Terrycot
(B) Cotton
(C) Rayon
(D) Polyester
Answer : B

Question. Which of the following observations shows that friction exists in a body?
(A) When movement is decreased or prevented.
(B) When there is a constant movement.
(C) When electromagnetic charges are produced.
(D) When there is a constant increase in weight.
Answer : A

Question. Which of the following statements is correct?
(A) Distilled water is a good conductor of electricity.
(B) An LED glows even when a weak electric current flows through it.
(C) Only liquid solutions of salts can conduct electricity.
(D) Zinc plating is done to make the object scratch proof.
Answer : B

Question. Identify the microorganism shown below.

(A) Virus
(B) Fungus
(C) Bacterium
(D) Protozoan
Answer : B

Question. Which of the following is NOT an allotrope of carbon?
(A) Diamond
(B) Graphite
(C) Charcoal
(D) Gypsum
Answer : D

Question. Which of the following events can cause earthquake ?
(A) Movement of earth’s plate
(B) Volcaniceruption
(C) Underground nuclear explosion
(D) All of the above
Answer : D

Question. Which of the following is the consequence of deforestation?
(A) Global warming
(B) Erosion of the top layer of soil
(C) Increase in the level of carbon dioxide in air
(D) All of the above
Answer : D