Complete the following Chemical reaction.
........+....... → CO2 + 2H2O + Heat
Concept: Carbon: a Versatile Element
Complete the following Chemical reaction.
2 NaOH + CO2 → ........+........
Concept: Carbon: a Versatile Element
Complete the following Chemical reaction.
..........+......... →CH3Cl + HCl
Concept: Carbon: a Versatile Element
Water in the waterfall flows from a higher level to the lower level because of ____________.
Concept: Electric Potential and Potential Difference
The differences between the electrostatic potential of the positive end the negative end of an electric cell is the __________ of the cell.
Concept: Electric Potential and Potential Difference
Three electric cells of potential difference 1.5 V each have been connected as a battery. The potential differences of the battery will be ________ V.
Concept: Electric Potential and Potential Difference
Electric cells having 2 V potential difference each have been connected in the form of a battery. What will be the total potential difference of the battery in both cases ?
(i)
(ii)
Concept: Electric Potential and Potential Difference
Sketch and label the figure of the following plant and explain them into brief.
Spirogyra
Concept: Basis for Classification : Cryptogams
Sketch and label the figure of the following plant and explain them into brief.
Marchantia
Concept: Basis for Classification : Cryptogams
Match the proper terms from columns A and C with the description in column B.
| ‘A’ | ‘B’ | ‘C’ |
| Thallophyta | Seeds are formed in fruits. | Fern |
| Bryophyta | No natural covering on seeds. | Cycas |
| Pteridophyta | These plants mainly grow in water. | Tamarind |
| Gymnosperms | These plants need water for reproduction. | Moss |
| Angiosperms | Tissues are present for the conduction of water and food | Algae |
Concept: Basis for Classification : Cryptogams
Fill in the blank to complete the statement. Justify the statement.
The first generation computers used to shut down because of ___________.
Concept: Important components of a computer
Answer the following.
Explain chemical co-ordination in humans and give the names and functions of some hormones.
Concept: Co-ordination
Solve the following example .
A 10 cm long stick is kept in front of a concave mirror having focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?
Concept: Spherical Mirrors
Solve the following example .
A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?
Concept: Spherical Mirrors
Solve the following example .
An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image ? what will be the size and nature of the image ?
Concept: Spherical Mirrors
In an electric circuit, electron flow a from of point of ________ potential to the point of ____________ potential.
Concept: Electric Circuit
A battery is to be formed by joining 3 dry cells with connecting wires. Show how will you connect the wires by drawing a diagram.
Concept: Electric Circuit
In an electric circuit, a battery and a bulb have been connected and the battery consists of two cells of equal potential difference. If the bulb is not glowing, then which tests will you perform in order to find out the reason for the bulb not glowing?
Concept: Electric Circuit
Define.
Biotechnology
Concept: Biotechnology
Umesh has two bulbs having resistances of 15Ω and 30Ω. He wants to connect them in a circuit, but if he connects them one at a time the filament gets burnt. Answer the following.
- Which method should he use to connect the bulbs?
- What are the characteristics of this way of connecting the bulbs depending on the answer of A above?
- What will be the effective resistance in the above circuit?
Concept: System of Resistors and Effective Resistance
