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:

• a convex mirror is used in mirror in car head light and the different types of material because convex mirror spread the light various in area

Answer 2

1-Which kind of mirrors are used in the headlights of a motor-car and why? Concave mirrors are used in head lights of vehicles because when the bulb of headlight is placed at focus of concave mirror it will allow the light to spread out to infinity after the reflection on the mirror.

2-A ray of light bends while going from one medium to another because of the phenomena of refraction. When the ray of light travels from one medium to another as the velocity of the light ray will either increase or decrease depending on the optical density of the material.

3-Name the physical quantities which are indicated by the direction of thumb and forefinger in the Fleming's right hand rule? Answer: In Fleming's right hand rule, thumb indicates — direction of motion of the conductor; forefinger indicates — direction of magnetic field.

4:A current-carrying solenoid behaves like a bar magnet. We know that a freely suspended bar magnet aligns itself in the north-south direction. So, a freely suspended current-carrying solenoid also aligns itself in the north-south direction.

5-The amount of heat(H) produced in a resistor(R)carrying a current (I) and having a potential difference (V) across it in a time(t) is given by the formula - al H= y R1.

6-The arteries carry oxygenated blood away from the heart while the veins carry deoxygenated blood from the tissue capillaries back towards the heart.

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