Why is the base of a cooking pan generally made thick?

The electrons present in the outermost shell of an atom.

Identify the term/substance

Is it possible for a hydrogen (¹₁H) nucleus to emit an alpha particle? Give a reason for your answer.

The specific heat capacity of a substance A is 3,800 J kg^-1 K^-1 and that of a substance B is 400 J kg^-1 K^-1. Which of the two substances is a good conductor of heat? Give a reason for your answer.

A hydrocarbon which is a greenhouse gas is:

A. Acetylene

B. Ethylene

C. Ethane

D. Methane

Read the extract given below and answer the questions that follow:

One Sunday morning Squealer announced that the hens, who just come in to lay again, must surrender their eggs.

(i) Why were the hens...

In the given figure, ABCDE is a pentagon inscribed in a circle such that AC is a diameter and side BC//AE. If ∠BAC = 50°, find giving reasons:

1. ∠ACB
2. ∠EDC
3. ∠BEC

Hence prove that BE is also a diameter

The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is:

1. 1:2
2. 1:0.01
3. 1:1
4. 0.01:1 [Given that H=1, O=16]

Name the highest criminal court in a district.

The diagram of an apparatus given below demonstrates a particular process in plants. Study the same and answer the questions that follow:

1. Name the apparatus.
2. Which phenomenon is demonstrated by this
...

The following table represent the elements and the atomic number.

With reference to this, answer the following using only the alphabets given in the table.

1. Which element combines with hydrogen to form
...

1. real and apparent depth?
2. velocity of light in vacuum or air and the velocity of light in a given medium?

The complex consisting of a DNA strand and a core of histones.

Give appropriate biological or technical terms for the following:

An electrolyte which completely dissociates into ions is:

A. Alcohol

B. Carbonic acid

C. Sucrose

D. Sodium hydroxide

A compound X (having vinegar like smell) when treated with ethanol in the presence of the acid Z, gives a compound Y which has a fruity smell. The reaction is:

1. Identify Y and Z.
2. Write the structural
...

Briefly explain: The trees in Monsoon Deciduous forests, shed their leaves for about 6-8 weeks during March and April.