Elements

Q. Which among the following is the most abundant element in the Earth's crust?

1. Nitrogen
2. Oxygen
3. Carbon monoxide
4. Carbon dioxide

Q. Who was the first scientist to define an element?

1. Antoine Laurent Lavoisier
2. J. J Thompson
3. Ernest Rutherford
4. Neils Bohr

Q.

Bromine is the only non-metal which is liquid at room temperature.

1. False

2. True

Q. Which among the following elements is liquid at room temperature?

1. Carbon
2. Sodium
3. Nitrogen
4. Bromine

Q. Who was the first scientist to use the term element?

1. J.J Thompson
2. Robert Boyle
3. Antoine Laurent Lavoisier
4. Neils Bohr

Q. The cardinal number of $A=\left\{\right(x:x=5n,n\in W,n<4\}$ is ___.$\left[2Marks\right]$

Q. Given : P = {2, 4, 6, 8, 10, 12, 14, 16}. What can be said about the elements of the set P?

1. All elements are even numbers.
2. The elements form an odd number series
3. The elements of P are at irregular intervals.
4. All elements are Prime numbers.

Q. If the set A is defined as A = {x : x is a factor of 42 and is a prime number}. Then the number of elements in set A is ____ .

1. 3

Q. The number of elements in the set {x : x is a letter of the word 'MISSISSIPPI'}, is ____ .

1. 4

Q. If X = { 1, 3, 5, 7}, then n(X) = _________.

1. 2
2. 1
3. 4
4. 3