6TH CLASS SCIENCE Ch5: MATERIALS AND THINGS COMPLETE CHAPTER VIDEO AND QUESTION & ANSWERS

6TH CLASS SCIENCE
Ch5: MATERIALS AND THINGS
COMPLETE CHAPTER VIDEO
&
QUESTION & ANSWERS

Q1. NAME ANY FIVE OBJECTS WHICH ARE MADE UP OF ONLY ONE MATERIAL.

ANS: 

Q2. NAME ANY FIVE OBJECTS WHICH ARE MADE UP OF MORE THAN TWO MATERIALS.

ANS:

Q3. LIST FIVE THINGS THAT WE CAN MAKE USING EACH OF THE FOLLOWING MATERIALS.

a) GLASS:

b) METAL:

c) PLASTIC :

d) WOOD:

ANS: REFER TO AND FIND THE ANSWER TO THE FIRST QUESTION.

Q4. MARY SAW A SHIP TRAVELLING ON A SEA. SHE KNOWS THAT IRON NAIL SINKS IN WATER. SHE HAS MANY DOUBTS, WHAT ARE HER DOUBTS? WRITE THEM.

ANS:  1). NAIL AND SHIP ARE MADE UP OF METALS, BUT WHY NAIL SINKS AND BOAT FLOATS?

2). WHAT IS THE FORMULA BEHIND SINKING AND FLOATING PROPERTY OF NAIL AND SHIP?

3). WHAT HAPPENS IF THE BOAT IS FILLED WITH WATER?

4). WE KNOW THAT THE NAIL SINKS IN WATER AND THE SHIP FLOATS ON WATER. BUT IF  WE DROP A NAIL ON A SHIP, WILL IT MAKE THE SHIP SINK?

5). CAN WE MAKE THE NAIL FLOAT ON WATER AFTER ITS SHAPE IS TURNED INTO A SHIP? 

Q5. MARY, WHILE EXAMINING WHETHER A BOILED EGG SINKS OR FLOATS, FOUND THAT IT FLOATS. BUT, VANKULA MADE IT SINK. HOW IS IT POSSIBLE? GUESS AND WRITE IT.

ANS: 1). GENERALLY THE MORE DENSITY THINGS ARE HEAVIER.

2). A BOILED EGG CONSISTS OF MORE DENSITY COMPARING TO WATER. 

3). IF WATER IS MADE HEAVIER BY ADDING SALT  TO IT, THEN THE EGG WILL FLOAT ON WATER. 

4). SO MARY MIGHT HAVE DROPPED THE EGG IN THE SALTWATER. THEN VAKULA 

MIGHT HAVE DROPPED THE EGG IN NORMAL DRINKING WATER.

Q6. DROP AN EGG IN A BEAKER OF WATER. NOW DROP THE SAME EGG IN ANOTHER BEAKER OF WATER IN WHICH EXCESSIVE SALT IS ADDED. WRITE YOUR OBSERVATIONS.

ANS: Lab Experiment:

Aim: TO OBSERVE THE AN EGG BY DROPPING IT IN NORMAL WATER AND SALT WATER.

Apparatus: 

WATER, GLASSES 2, SALT, EGG

Procedure: 

1. TAKE SOME NORMAL AND SALT WATER IN TWO DIFFERENT GLASSES.

2. DROP AN EGG IN THE NORMAL WATER.

3. DROP THE SAME EGG IN THE SALT WATER.

Observation:

I OBSERVED THE EGG SINKING IN NORMAL WATER AND FLOATING ON SALT WATER. 

Inference: 

THIS IS BECAUSE OF THE DIFFERENCE IN THE DENSITY OF WATER.

Q7. DO THE FOLLOWING ACTIVITIES. WRITE DOWN YOUR OBSERVATIONS. WHAT DO YOU CONCLUDE. 

a). MIX CHALK POWDER IN WATER.

b). PLACE A PIECE OF CANDLE IN WATER. 

c). ADD SOME OIL DROPS TO A BEAKER OF WATER.

ANS:

a). Chalk powder has more density. Insoluble in water and it sinks in water.

b). Candle wax has less density. It floats on water and insoluble in water.

c). Oil density is less. It spreads on water and insoluble in water.

Q8. MAKE A LIST OF ITEMS IN YOUR KITCHEN LIKE UTENSILS, FOOD INGREDIENTS ETC. CLASSIFY THEM AS FOLLOWS.

ANS: updated soon...