Question : Which of the following options are homogeneous mixtures?

Option 1: Solution, colloid, suspension, milk, toothpaste, salt water and brass

Option 2: The solution, salt water and Brass

Option 3: Solution, Colloid, Milk, Toothpaste, Saltwater, and Brass

Option 4: Colloid, suspension, milk and toothpaste

Question : Three vessels whose capacities are 3 : 2 : 1 are filled with milk mixed with water. The ratio of milk and water in the mixture of vessels is 5 : 2, 4 : 1, and 4 : 1, respectively. Taking $\frac{1}{3}$ of first, $\frac{1}{2}$ of second, and $\frac{1}{7}$ of third mixtures, a new mixture kept in a new vessel is prepared. The percentage of water in the new mixture is:

Option 1: 28%

Option 2: 32%

Option 3: 30%

Option 4: 24%

Question : A canister holds 36 litres of a mixture of milk and water in a ratio of 3 : 1. 15 litres of milk is added to the canister. The new ratio of the mixture is:

Option 1: 12 : 5

Option 2: 14 : 3

Option 3: 7 : 4

Option 4: 9 : 4

Question : In a filament-type light bulb, most of the electric power consumed appears as

Option 1: visible light

Option 2: infrared rays

Option 3: ultraviolet rays

Option 4: fluorescent light