NSO (International Science Olympiad) Class 8 Paper 2012 Part 2 Download All the Papers for 2021 Exam

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Q 10. Read the given statement and mark the correct option:

Statment1: when a bicycle is in motion the force of friction exerted by the ground on the two wheels is always in forward direction.

Statement2: The frictional force acts only when the bodies are in contact.

(A) Both statement 1 and 2 are true and statement 2 is the correct explanation of statment1.

(B) Both statement 1 and 2 are true but statement 2 is not the correct explanation of statment1.

(C) Statement 1 is true but statement 2 is false.

(D) Statement 1 is false and statement 2 is true.

Q 11. A copper disc has a circular hole drilled in it so that it can act as washer for a nut and bolt. If this washer is heated equally all over which of the given option will be true?

Image Circumference of Inner Hole & Washer
Title: Image of Cirumfernce of Inner Hole & Washer
Circumference of inner holecircumference of washer
(A) Remains constantIncreases
(B) DecreasesIncreases
(C) IncreasesDecreases
(D) IncreasesIncreases

Q 12. Which of the following cannot be charged easily by friction?

(A) A plastic scale

(B) A Woolen cloth

(C) An inflated balloon

(D) A copper rod

Q 13. Three students stand 2m apart in front of a plane mirror that is 3m long. Student y is standing At the mid-point of the mirror . how many student (S) can see the images of the other two.

Students Stand 2m a Part of Plane Mirror

(A)

(B)

(C)

(D)

Q 14. A car driver took a total of two hours to make a journey of . he had a coffee break of half an hour and spent a quarter of an hour stationary in a traffic jam. What was his average speed during the journey?

(A)

(B)

(C)

(D)

Q 15. Taking one light year equal to and one day equal to , what will be the speed of light in light year per day if the speed of light in is ?

(A)

(B)

(C)

(D)

Q 16. Sudha took a small amount of sulphur in deflagrating spoon and heated it over a burner. As soon as it started burning, she put it in gas jar and covered with a lid. After sulphur stopped burning, she added a small amount of water in it and dissolved the gas in water by shaking it. She then tested the solution with red and blue litmus paper. What did she observe?

Sulphur in Deflagrating Spoon & Heated Burner

(A) In the solution the blue litmus paper turned red.

(B) In the solution the red litmus paper turned blue.

(C) There was no change in the colour of litmus paper.

(D) Blue litmus paper turned red and red litmus paper turned blue.

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