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Preeti Dabral 1 week, 6 days ago
yes, mirror change direction of light which is termed as reflection.as mirror is a flat plane surface when the light ray is incident on mirror and forms a reflected angel Which is equal to angel of incidence so in this way mirror change the direction of light causing reflection because of which we see our image on it
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Preeti Dabral 5 days, 5 hours ago
When we switch on a light bulb, it is due to the heating effect of electric current, and when we turn the ceiling fan on, it is due to the magnetic effect of current.
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Preeti Dabral 2 weeks, 1 day ago
Cutting grass or pulverizing a rock are examples of irreversible physical changes. Chopping wood for a fire also represents an irreversible physical change, since the pieces cannot be put back together to form the tree.
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The cheetah is the fastest land animal and can achieve a peak velocity of 100 km/h up to the distances less than 500 m.
Posted by Divya Kumari 2 weeks, 3 days ago
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Preeti Dabral 2 weeks, 3 days ago
First calculate the total distance traveled using the odometer.
starting reading at 1:25 was 24830 km
end reading at 3:15 was 25005
Therefore total distance traveled was 25005km - 24830km = 175 km
Total time taken between 1:25pm and 3:15 pm 3:15
-1:25
1hr 50 mins
1 and 5/6 hours = 11/6 hrs
Speed = distance/time
175 ÷ 11/6 = 175 × 6/11
95.45 km/hr
speed in m/s.....multipy by 1000/3600
95.45 × 10/36
= 26.52 meters/second
Posted by Purv Patel 2 weeks, 5 days ago
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Preeti Dabral 2 weeks, 5 days ago
- A change in which the molecules are rearranged, but their internal composition remains same is called Physical Change. A process in which the substance transforms into a new substance, having a different chemical composition, it is known as Chemical Change.
- Some common examples of physical change vaporisation, condensation, freezing/melting/boiling of water. On the contrary, the examples of chemical change are combustion, metabolism, cooking of egg, etc.
- Physical change is a temporary; they are easily reversible. As against this, the chemical change is permanent in nature, i.e. they cannot be reversed, even by reversing conditions.
- In the physical change, only the form of the substance is changed, but no new product is formed. On the other hand, when there is a chemical reaction, a completely different product is formed, whose properties are completely different from that of the reacting substances.
- In a physical change, the original matter can be recovered, by simple physical methods. As opposed, in chemical change the original matter no longer exist, and so it cannot be recovered.
- In the physical change, change in the physical attributes of the substance is observed, such as shape, size, appearance, texture, odour, density and so on. Conversely, chemical change involves the change in chemical properties of the substance, i.e. change in its chemical nature.
- In the physical change, no or very little amount of energy is absorbed or given out as heat, light or sound energy. Unlike chemical change, wherein enormous energy is absorbed or given out as heat, light or sound energy
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| Sexual Reproduction | Asexual Reproduction |
| Occurs in bisexual plants. | Occurs in unisexual plants. |
| Reproductive organs are present. | Reproductive organs are not present. |
| Fertilization of gametes gives rise to oxygen. | Processes like gamete formation or fertilization is not seen. |
| Characteristics of both parents are inherited. | Characteristics of only one parent is inherited. |
| Seeds are used to get new plants from a flower. | No need of seeds. |
| Both male and female parents involved. | Only one parent plant is involved. |
| Seeds are used to get new plants from a flower. | No need of seeds. |
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