#### Class 8th Standard New Syllabus Creative Question In Chapter Forces And Pressure

8th Standard 2019 EM

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Science

Use Blue Ink Pen Only

Time : 02:00:00 Hrs
Total Marks : 50

Part-A

Multiple Chioce Qusetion

3 x 1 = 3
1. If we apply a force against the direction of motion of a body, then the body will

(a)

stop moving

(b)

move with an increased speed

(c)

move with a decreased speed

(d)

move in a different direction

2. Which of the following liquids has more viscosity?

(a)

Grease

(b)

Water

(c)

Coconut oil

(d)

Ghee

3. The unit of viscosity is

(a)

N m2

(b)

poise

(c)

kg m s–1

(d)

no unit

4. Part-B

4 x 2 = 8
5. Name two instruments, which help to measure the pressure of a fluid.

6. Define one atmosphere.

7. Why are heavy bags provided with broad straps?

8. Which has greater viscosity, oil or honey? Why?

9. Part-C

3 x 3 = 9
10. Why is a ball bearing used in a cycle hub?

11. Why is it not advisable to take a fountain pen while travelling in an aeroplane?

12. Vidhya posts a question: Mercury is costly. So, instead of mercury can we use water as a barometric liquid? Answer to Vidhya and explain, the difficulty of constructing a water barometer.

13. Part-D

4 x 5 = 20
14. Give the different types of friction and explain each with an example.

15. Describe an experiment to prove that friction depends on the nature of a surface.

16. Explain how friction can be minimised.

17. Describe an experiment to prove that the pressure in a liquid increases with depth.