8th Standard Science Chapter-5

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8th Standard Science quiz Chapter-5

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8th Standard Science Chapter 5


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Q11. Which of the following graph represents the correct variation of angle of incidence (i) and angle of deviation (δ)?

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Q12. Figure a, b, c respectively; indicate the point in case of:

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Q13. In which of the following cases will no dispersion take place when sunlight passes through it?

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14. A: Astigmatism usually is caused by an irregularly shaped cornea.

B: Rainbow is the natural phenomenon in which dispersion takes place.

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Q15. Having two eyes facilitates in:

A: Increasing the field of view

B: Bringing three dimensional view

C: Developing the concept of distance/size.

Then the correct option is/are:

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Q11. Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio.

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Q12. At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

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Q13. If the current flowing through a fixed resistor is halved, the heat produced in it will become:

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Q14. You are given four ammeters A, B, C and D having least counts mentioned below:

(I) Ammeter A with least count 0.25 A

(II) Ammeter B with least count 0.5 A

(III) Ammeter C with least count 0.05 A

(IV) Ammeter D with least count 0.1 A

Which of the ammeters would you prefer for doing an experiment to determine the equivalent resistance of two resistances most accurately, when connected in parallel?

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Q15. In the given figure, the resistors

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