Explain any three political causes of the Revolt of 1857.

The 4^th term of a G.P. is 16 and the 7^th term is 128. Find the first term and common ratio of the series.

Burning of ammonia in air.

State the significance of the Policy of Appeasement as a cause for the Second World War

A plant cell may burst when:

1. Turgor pressure equalises wall pressure.
2. Turgor pressure exceeds wall pressure.
3. Wall pressure exceeds turgor pressure.
4. None of the above

Write a balanced chemical equation: Action of dilute sulphuric acid on zinc sulphide

The electrolyte used for electroplating an article with silver. Identify the substance underlined.

Aluminum carbide reacts with water according to the following equation:

Al₄C₃ + 12H₂O → 4Al (OH)₃ + 3CH₄

1. What mass of aluminum hydroxide is formed from 12 g of aluminum carbide?
2. What volume
...

The diagram below shows a loop of wire carrying current I:

1. What is the magnetic polarity of the loop that faces us?
2. With respect to the diagram how can we increase the strength of the magnetic field
...

Give a reason: Kanyakumari experiences equable climate.

Which of the following is a common characteristic of a covalent compound?

1. high melting point
2. consists of molecules
3. always soluble in water
4. conducts electricity when it is in the molten state

There is plenty of rain in India during the rainy season, yet we need irrigation. Give two reasons to support this statement.

ATP and AIDS [expand the abbreviations]

Differentiate between the following pairs on the basis of what is indicated in the brackets.

Equation for the reaction when compound A is bubbled through bromine dissolved in carbon tetrachloride is as follows:

1. Draw the structure of A.
2. State your observation during this reaction.

1. Name the transformer used in the power transmitting station of a power plant.
2. What type of current is transmitted from the power station?
3. At what voltage is this current available to our household?

There are 25 discs numbered 1 to 25. They are put in a closed box and shaken thoroughly. A disc is drawn at random from the box. Find the probability that the number on the disc is:

1. an odd number
2. divisible
...