Question

Which kind of mirrors are used in the headlights of a motor-car and why?

1

6. Why does a ray of light bend when it travels from one medium into another?

OR

In a concave mirror where should we keep the object so that image formed will be real

, inverted and enlarged ?

1

7. Name the physical quantities which are indicated by the direction of thumb and

forefinger in the Fleming’s right hand rule?

1

8. A current carrying solenoid coil is suspended freely . in which direction will it settle

and why?

1

9. Give symbol of (i) an electric cell (ii) battery of cells.

OR

What will be the amount of heat (H) produced in a resistor (R) carrying a current (I)

and having a potential difference (V) across it in time (t)? 1

10. Write one difference between artery and vein.

1

11. Write the balanced chemical equation for the process of photosynthesis.

OR

When do the desert plants take up carbon dioxide and perform photosynthesis? 1

12. Rearrange the following according to their ascending trophic level in a food chain

Hawk, Grass, Snake, Rabbit

OR

Why are bacteria and fungi called decomposers? 1

13. Name any one enzyme of our digestive system and write its function.​

Answer 1

Answer:

Concave mirror are used in car headlamp. Concave mirror has converging power, it can concentrate the light ray at a particular point. And in night we want highly concentrated light beam for clear visibility. This is why concave mirror is used.

Answer 2

Answer:

a concave mirror are used in the headlightsof a car. the reason being that a concave mirroras a opposed on a convex mirror which is a diverging mirror. in headlights the bulb is kept at the focus of the mirror