CBSE - Matter in Our Surroundings

1 Matter in Our Surroundings 

Cheese is an example of which type of colloid?

(1) Gel
(2) Foam
(3) Sol
(4) Solid sol

2 Matter in Our Surroundings 

The fourth state of matter is :

(1) solid
(2) fluid
(3) liquid
(4) plasma

3 Matter in Our Surroundings 

A solid cube of iron whose edge is 4 inches weighs 20.8 lbs. Determine the specific gravity of this sample of iron, if water weighs 62.4 pounds per cubic foot?

(1) 4.5
(2) 5.2
(3) 9.0
(4) 27 

4 Matter in Our Surroundings 

Constituent of gasohol is:

(1) 90% petrol + 10% alcohol
(2) 80% petrol + 20% ethanol
(3) 60% petrol + 40% ethanol
(4) 50% petrol + 50% ethanol

5 Matter in Our Surroundings 

A drop each of two non-corrosive and non-irritating liquids A and B at a temperature of 22^o C are placed on the skin. Liquid A gives a more cooling sensation than liquid B. Which of the following can be said about liquids A and B?

(1) Liquid A has higher boiling point than that of liquid B
(2) Liquid A has higher latent heat of vaporization than that of liquid B
(3) Liquid A has lower latent heat of vaporization than that of liquid B
(4) The boiling points of liquid A and B are equal

6 Matter in Our Surroundings 

The method to purify the colloidal solution

(1) peptization
(2) coagulation
(3) dialysis
(4) bredig's arc method

7 Matter in Our Surroundings 

A specific temperature and pressure where solid, liquid, and gas phases exist simultaneously, is called:

(1) the point of equilibrium
(2) the triple point
(3) the freezing point
(4) the point where reactants first form products
 

8 Matter in Our Surroundings 

The interparticle attractive force ______ with increasing distance between particles.

(1) increases
(2) decreases
(3) increases moderately
(4) none

9 Matter in Our Surroundings 

Two identical beakers labeled as (X) and (Y) contain 100 cm³ of water each at 20^oC. To the water in the beaker (X), 100g of water at 0^o C was added and stirred to mix thoroughly. To the beaker (Y), 100g of ice at 0^oC was added and stirred till it melted into water. The water in the beaker (Y) will be:

(1) hotter than water in beaker X
(2) colder than water in beaker X
(3) heavier than water in beaker X
(4) lighter than water in beaker X

10 Matter in Our Surroundings 

Which one of the following is a pseudo solid?

(1) Calcium fluoride
(2) Glass
(3) Sodium chloride
(4) All of the above